Re: Still OOM problems with 4.9er kernels

Re: Still OOM problems with 4.9er kernels

[Gerhard Wiesinger]

Hello,

same with latest kernel rc, dnf still killed with OOM (but sometimes 
better).

./update.sh: line 40:  1591 Killed                  ${EXE} update ${PARAMS}
(does dnf clean all;dnf update)
Linux database.intern 4.9.0-0.rc8.git2.1.fc26.x86_64 #1 SMP Wed Dec 7 
17:53:29 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

Updated bug report:
https://bugzilla.redhat.com/show_bug.cgi?id=1314697

Any chance to get it fixed in 4.9.0 release?

Ciao,
Gerhard


On 30.11.2016 08:20, Gerhard Wiesinger wrote:
> Hello,
>
> See also:
> Bug 1314697 - Kernel 4.4.3-300.fc23.x86_64 is not stable inside a KVM VM
> https://bugzilla.redhat.com/show_bug.cgi?id=1314697
>
> Ciao,
> Gerhard
>
>
> On 30.11.2016 08:10, Gerhard Wiesinger wrote:
>> Hello,
>>
>> I'm having out of memory situations with my "low memory" VMs in KVM 
>> under Fedora (Kernel 4.7, 4.8 and also before). They started to get 
>> more and more sensitive to OOM. I recently found the following info:
>>
>> https://marius.bloggt-in-braunschweig.de/2016/11/17/linuxkernel-4-74-8-und-der-oom-killer/ 
>>
>> https://www.spinics.net/lists/linux-mm/msg113661.html
>>
>> Therefore I tried the latest Fedora kernels: 
>> 4.9.0-0.rc6.git2.1.fc26.x86_64
>>
>> But OOM situation is still very easy to reproduce:
>>
>> 1.) VM with 128-384MB under Fedora 25
>>
>> 2.) Having some processes run without any load (e.g. Apache)
>>
>> 3.) run an update with: dnf clean all; dnf update
>>
>> 4.) dnf python process get's killed
>>
>>
>> Please make the VM system working again in Kernel 4.9 and to use swap 
>> again correctly.
>>
>> Thnx.
>>
>> Ciao,
>>
>> Gerhard
>>
>>
>

Re: Still OOM problems with 4.9er kernels

[Michal Hocko]

On Fri 09-12-16 08:06:25, Gerhard Wiesinger wrote:
> Hello,
> 
> same with latest kernel rc, dnf still killed with OOM (but sometimes
> better).
> 
> ./update.sh: line 40:  1591 Killed                  ${EXE} update ${PARAMS}
> (does dnf clean all;dnf update)
> Linux database.intern 4.9.0-0.rc8.git2.1.fc26.x86_64 #1 SMP Wed Dec 7
> 17:53:29 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
> 
> Updated bug report:
> https://bugzilla.redhat.com/show_bug.cgi?id=1314697

Could you post your oom report please?
-- 
Michal Hocko
SUSE Labs

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Re: Still OOM problems with 4.9er kernels

[Gerhard Wiesinger]

On 09.12.2016 14:40, Michal Hocko wrote:
> On Fri 09-12-16 08:06:25, Gerhard Wiesinger wrote:
>> Hello,
>>
>> same with latest kernel rc, dnf still killed with OOM (but sometimes
>> better).
>>
>> ./update.sh: line 40:  1591 Killed                  ${EXE} update ${PARAMS}
>> (does dnf clean all;dnf update)
>> Linux database.intern 4.9.0-0.rc8.git2.1.fc26.x86_64 #1 SMP Wed Dec 7
>> 17:53:29 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
>>
>> Updated bug report:
>> https://bugzilla.redhat.com/show_bug.cgi?id=1314697
> Could you post your oom report please?

E.g. a new one with more than one included, first one after boot ...

Just setup a low mem VM under KVM and it is easily triggerable.

Still enough virtual memory available ...

4.9.0-0.rc8.git2.1.fc26.x86_64

[  624.862777] ksoftirqd/0: page allocation failure: order:0, 
mode:0x2080020(GFP_ATOMIC)
[  624.863319] CPU: 0 PID: 3 Comm: ksoftirqd/0 Not tainted 
4.9.0-0.rc8.git2.1.fc26.x86_64 #1
[  624.863410] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), 
BIOS 1.9.3
[  624.863510]  ffffaa62c007f958 ffffffff904774e3 ffffffff90c7dd98 
0000000000000000
[  624.863923]  ffffaa62c007f9e0 ffffffff9020e6ea 0208002000000246 
ffffffff90c7dd98
[  624.864019]  ffffaa62c007f980 ffff96b900000010 ffffaa62c007f9f0 
ffffaa62c007f9a0
[  624.864998] Call Trace:
[  624.865149]  [<ffffffff904774e3>] dump_stack+0x86/0xc3
[  624.865347]  [<ffffffff9020e6ea>] warn_alloc+0x13a/0x170
[  624.865432]  [<ffffffff9020e9e2>] __alloc_pages_slowpath+0x252/0xbb0
[  624.865563]  [<ffffffff9020f74d>] __alloc_pages_nodemask+0x40d/0x4b0
[  624.865675]  [<ffffffff9020f983>] __alloc_page_frag+0x193/0x200
[  624.866024]  [<ffffffff907a1d7e>] __napi_alloc_skb+0x8e/0xf0
[  624.866113]  [<ffffffffc017777d>] page_to_skb.isra.28+0x5d/0x310 
[virtio_net]
[  624.866201]  [<ffffffffc01794cb>] virtnet_receive+0x2db/0x9a0 
[virtio_net]
[  624.867378]  [<ffffffffc0179bad>] virtnet_poll+0x1d/0x80 [virtio_net]
[  624.867494]  [<ffffffff907b501e>] net_rx_action+0x23e/0x470
[  624.867612]  [<ffffffff9091a8cd>] __do_softirq+0xcd/0x4b9
[  624.867704]  [<ffffffff900dd164>] ? smpboot_thread_fn+0x34/0x1f0
[  624.867833]  [<ffffffff900dd25d>] ? smpboot_thread_fn+0x12d/0x1f0
[  624.867924]  [<ffffffff900b7c95>] run_ksoftirqd+0x25/0x80
[  624.868109]  [<ffffffff900dd258>] smpboot_thread_fn+0x128/0x1f0
[  624.868197]  [<ffffffff900dd130>] ? sort_range+0x30/0x30
[  624.868596]  [<ffffffff900d82c2>] kthread+0x102/0x120
[  624.868679]  [<ffffffff909117a0>] ? wait_for_completion+0x110/0x140
[  624.868768]  [<ffffffff900d81c0>] ? kthread_park+0x60/0x60
[  624.868850]  [<ffffffff90917afa>] ret_from_fork+0x2a/0x40
[  843.528656] httpd (2490) used greatest stack depth: 10304 bytes left
[  878.077750] httpd (2976) used greatest stack depth: 10096 bytes left
[93918.861109] netstat (14579) used greatest stack depth: 9488 bytes left
[94050.874669] kworker/dying (6253) used greatest stack depth: 9008 
bytes left
[95895.765570] kworker/1:1H: page allocation failure: order:0, 
mode:0x2280020(GFP_ATOMIC|__GFP_NOTRACK)
[95895.765819] CPU: 1 PID: 440 Comm: kworker/1:1H Not tainted 
4.9.0-0.rc8.git2.1.fc26.x86_64 #1
[95895.765911] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), 
BIOS 1.9.3
[95895.766060] Workqueue: kblockd blk_mq_run_work_fn
[95895.766143]  ffffaa62c0257628 ffffffff904774e3 ffffffff90c7dd98 
0000000000000000
[95895.766235]  ffffaa62c02576b0 ffffffff9020e6ea 0228002000000046 
ffffffff90c7dd98
[95895.766325]  ffffaa62c0257650 ffff96b900000010 ffffaa62c02576c0 
ffffaa62c0257670
[95895.766417] Call Trace:
[95895.766502]  [<ffffffff904774e3>] dump_stack+0x86/0xc3
[95895.766596]  [<ffffffff9020e6ea>] warn_alloc+0x13a/0x170
[95895.766681]  [<ffffffff9020e9e2>] __alloc_pages_slowpath+0x252/0xbb0
[95895.766767]  [<ffffffff9020f74d>] __alloc_pages_nodemask+0x40d/0x4b0
[95895.766866]  [<ffffffff9026db51>] alloc_pages_current+0xa1/0x1f0
[95895.766971]  [<ffffffff90916f17>] ? _raw_spin_unlock+0x27/0x40
[95895.767073]  [<ffffffff90278956>] new_slab+0x316/0x7c0
[95895.767160]  [<ffffffff9027ae8b>] ___slab_alloc+0x3fb/0x5c0
[95895.772611]  [<ffffffff9010b042>] ? cpuacct_charge+0xf2/0x1f0
[95895.773406]  [<ffffffffc005850d>] ? alloc_indirect.isra.11+0x1d/0x50 
[virtio_ring]
[95895.774327]  [<ffffffff901319d5>] ? rcu_read_lock_sched_held+0x45/0x80
[95895.775212]  [<ffffffffc005850d>] ? alloc_indirect.isra.11+0x1d/0x50 
[virtio_ring]
[95895.776155]  [<ffffffff9027b0a1>] __slab_alloc+0x51/0x90
[95895.777090]  [<ffffffff9027d141>] __kmalloc+0x251/0x320
[95895.781502]  [<ffffffffc005850d>] ? alloc_indirect.isra.11+0x1d/0x50 
[virtio_ring]
[95895.782309]  [<ffffffffc005850d>] alloc_indirect.isra.11+0x1d/0x50 
[virtio_ring]
[95895.783334]  [<ffffffffc0059193>] virtqueue_add_sgs+0x1c3/0x4a0 
[virtio_ring]
[95895.784059]  [<ffffffff90068475>] ? kvm_sched_clock_read+0x25/0x40
[95895.784742]  [<ffffffffc006665c>] __virtblk_add_req+0xbc/0x220 
[virtio_blk]
[95895.785419]  [<ffffffff901312fd>] ? debug_lockdep_rcu_enabled+0x1d/0x20
[95895.786086]  [<ffffffffc0066935>] ? virtio_queue_rq+0x105/0x290 
[virtio_blk]
[95895.786750]  [<ffffffffc006695d>] virtio_queue_rq+0x12d/0x290 
[virtio_blk]
[95895.787427]  [<ffffffff9045015d>] __blk_mq_run_hw_queue+0x26d/0x3b0
[95895.788106]  [<ffffffff904502e2>] blk_mq_run_work_fn+0x12/0x20
[95895.789065]  [<ffffffff900d097e>] process_one_work+0x23e/0x6f0
[95895.789741]  [<ffffffff900d08fa>] ? process_one_work+0x1ba/0x6f0
[95895.790444]  [<ffffffff900d0e7e>] worker_thread+0x4e/0x490
[95895.791178]  [<ffffffff900d0e30>] ? process_one_work+0x6f0/0x6f0
[95895.791911]  [<ffffffff900d0e30>] ? process_one_work+0x6f0/0x6f0
[95895.792653]  [<ffffffff90003eec>] ? do_syscall_64+0x6c/0x1f0
[95895.793397]  [<ffffffff900d82c2>] kthread+0x102/0x120
[95895.794212]  [<ffffffff90111775>] ? trace_hardirqs_on_caller+0xf5/0x1b0
[95895.794942]  [<ffffffff900d81c0>] ? kthread_park+0x60/0x60
[95895.795689]  [<ffffffff90917afa>] ret_from_fork+0x2a/0x40
[95895.796408] Mem-Info:
[95895.797110] active_anon:8800 inactive_anon:9030 isolated_anon:32
                 active_file:263 inactive_file:238 isolated_file:0
                 unevictable:0 dirty:0 writeback:330 unstable:0
                 slab_reclaimable:5241 slab_unreclaimable:9538
                 mapped:470 shmem:9 pagetables:2200 bounce:0
                 free:690 free_pcp:68 free_cma:0
[95895.801218] Node 0 active_anon:35200kB inactive_anon:36120kB 
active_file:1052kB inactive_file:952kB unevictable:0kB 
isolated(anon):128kB isolated(file):0kB mapped:1880kB dirty:0kB 
writeback:1320kB shmem:0kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 
36kB writeback_tmp:0kB unstable:0kB pages_scanned:179 all_unreclaimable? no
[95895.803264] Node 0 DMA free:924kB min:172kB low:212kB high:252kB 
active_anon:3544kB inactive_anon:3944kB active_file:84kB 
inactive_file:140kB unevictable:0kB writepending:4kB present:15992kB 
managed:15908kB mlocked:0kB slab_reclaimable:1728kB 
slab_unreclaimable:2964kB kernel_stack:84kB pagetables:1396kB bounce:0kB 
free_pcp:0kB local_pcp:0kB free_cma:0kB
[95895.805936] lowmem_reserve[]: 0 117 117 117 117
[95895.806751] Node 0 DMA32 free:1836kB min:1296kB low:1620kB 
high:1944kB active_anon:31636kB inactive_anon:32164kB active_file:968kB 
inactive_file:804kB unevictable:0kB writepending:1288kB present:180080kB 
managed:139012kB mlocked:0kB slab_reclaimable:19236kB 
slab_unreclaimable:35188kB kernel_stack:1852kB pagetables:7404kB 
bounce:0kB free_pcp:272kB local_pcp:156kB free_cma:0kB
[95895.809223] lowmem_reserve[]: 0 0 0 0 0
[95895.810071] Node 0 DMA: 36*4kB (H) 29*8kB (H) 22*16kB (H) 6*32kB (H) 
0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 920kB
[95895.812089] Node 0 DMA32: 77*4kB (H) 71*8kB (H) 28*16kB (H) 8*32kB 
(H) 4*64kB (H) 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 1836kB
[95895.813979] Node 0 hugepages_total=0 hugepages_free=0 
hugepages_surp=0 hugepages_size=2048kB
[95895.813981] 1804 total pagecache pages
[95895.814931] 1289 pages in swap cache
[95895.815849] Swap cache stats: add 5288014, delete 5286725, find 
11568655/13881082
[95895.816792] Free swap  = 1791816kB
[95895.817706] Total swap = 2064380kB
[95895.819222] 49018 pages RAM
[95895.820145] 0 pages HighMem/MovableOnly
[95895.821039] 10288 pages reserved
[95895.823325] 0 pages cma reserved
[95895.824244] 0 pages hwpoisoned
[95895.825237] SLUB: Unable to allocate memory on node -1, 
gfp=0x2080020(GFP_ATOMIC)
[95895.826140]   cache: kmalloc-256, object size: 256, buffer size: 256, 
default order: 0, min order: 0
[95895.827034]   node 0: slabs: 113, objs: 1808, free: 0
[97883.838418] httpd invoked oom-killer: 
gfp_mask=0x24201ca(GFP_HIGHUSER_MOVABLE|__GFP_COLD), nodemask=0, 
order=0, oom_score_adj=0
[97883.843507] httpd cpuset=/ mems_allowed=0
[97883.843601] CPU: 1 PID: 19043 Comm: httpd Not tainted 
4.9.0-0.rc8.git2.1.fc26.x86_64 #1
[97883.844628] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), 
BIOS 1.9.3
[97883.845839]  ffffaa62c395f958 ffffffff904774e3 ffffaa62c395fb20 
ffff96b98b8b3100
[97883.846970]  ffffaa62c395f9e0 ffffffff902a8c41 0000000000000000 
0000000000000000
[97883.848388]  ffffffff90ec6840 ffffaa62c395f990 ffffffff9011183d 
ffffaa62c395f9b0
[97883.849945] Call Trace:
[97883.851366]  [<ffffffff904774e3>] dump_stack+0x86/0xc3
[97883.852535]  [<ffffffff902a8c41>] dump_header+0x7b/0x24f
[97883.853718]  [<ffffffff9011183d>] ? trace_hardirqs_on+0xd/0x10
[97883.854857]  [<ffffffff902085d3>] oom_kill_process+0x203/0x3e0
[97883.856192]  [<ffffffff90208afb>] out_of_memory+0x13b/0x580
[97883.857334]  [<ffffffff90208bea>] ? out_of_memory+0x22a/0x580
[97883.858590]  [<ffffffff9020f31a>] __alloc_pages_slowpath+0xb8a/0xbb0
[97883.859706]  [<ffffffff9020f74d>] __alloc_pages_nodemask+0x40d/0x4b0
[97883.860854]  [<ffffffff90037de9>] ? sched_clock+0x9/0x10
[97883.862120]  [<ffffffff9026db51>] alloc_pages_current+0xa1/0x1f0
[97883.863251]  [<ffffffff90201d96>] __page_cache_alloc+0x146/0x190
[97883.864449]  [<ffffffff9020366c>] ? pagecache_get_page+0x2c/0x300
[97883.865602]  [<ffffffff90206055>] filemap_fault+0x345/0x790
[97883.866661]  [<ffffffff90206238>] ? filemap_fault+0x528/0x790
[97883.867795]  [<ffffffff903639d9>] ext4_filemap_fault+0x39/0x50
[97883.869289]  [<ffffffff90241ca3>] __do_fault+0x83/0x1d0
[97883.870301]  [<ffffffff90246642>] handle_mm_fault+0x11e2/0x17a0
[97883.871304]  [<ffffffff902454ba>] ? handle_mm_fault+0x5a/0x17a0
[97883.872491]  [<ffffffff9006de16>] __do_page_fault+0x266/0x520
[97883.873406]  [<ffffffff9006e1a8>] trace_do_page_fault+0x58/0x2a0
[97883.874262]  [<ffffffff90067f3a>] do_async_page_fault+0x1a/0xa0
[97883.875168]  [<ffffffff90918e28>] async_page_fault+0x28/0x30
[97883.882611] Mem-Info:
[97883.883747] active_anon:2915 inactive_anon:3376 isolated_anon:0
                 active_file:3902 inactive_file:3639 isolated_file:0
                 unevictable:0 dirty:205 writeback:0 unstable:0
                 slab_reclaimable:9856 slab_unreclaimable:9682
                 mapped:3722 shmem:59 pagetables:2080 bounce:0
                 free:748 free_pcp:15 free_cma:0
[97883.890766] Node 0 active_anon:11660kB inactive_anon:13504kB 
active_file:15608kB inactive_file:14556kB unevictable:0kB 
isolated(anon):0kB isolated(file):0kB mapped:14888kB dirty:820kB 
writeback:0kB shmem:0kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 
236kB writeback_tmp:0kB unstable:0kB pages_scanned:168352 
all_unreclaimable? yes
[97883.893210] Node 0 DMA free:1468kB min:172kB low:212kB high:252kB 
active_anon:1716kB inactive_anon:912kB active_file:2292kB 
inactive_file:876kB unevictable:0kB writepending:24kB present:15992kB 
managed:15908kB mlocked:0kB slab_reclaimable:4652kB 
slab_unreclaimable:2852kB kernel_stack:76kB pagetables:496kB bounce:0kB 
free_pcp:0kB local_pcp:0kB free_cma:0kB
[97883.898799] lowmem_reserve[]: 0 117 117 117 117
[97883.899735] Node 0 DMA32 free:1524kB min:1296kB low:1620kB 
high:1944kB active_anon:9944kB inactive_anon:12572kB active_file:13316kB 
inactive_file:13680kB unevictable:0kB writepending:768kB 
present:180080kB managed:139012kB mlocked:0kB slab_reclaimable:34772kB 
slab_unreclaimable:35876kB kernel_stack:1828kB pagetables:7824kB 
bounce:0kB free_pcp:60kB local_pcp:52kB free_cma:0kB
[97883.903033] lowmem_reserve[]: 0 0 0 0 0
[97883.904371] Node 0 DMA: 36*4kB (H) 29*8kB (H) 22*16kB (H) 9*32kB (H) 
3*64kB (H) 2*128kB (H) 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 1464kB
[97883.906442] Node 0 DMA32: 13*4kB (H) 4*8kB (H) 13*16kB (H) 8*32kB (H) 
9*64kB (H) 1*128kB (H) 1*256kB (H) 0*512kB 0*1024kB 0*2048kB 0*4096kB = 
1508kB
[97883.908598] Node 0 hugepages_total=0 hugepages_free=0 
hugepages_surp=0 hugepages_size=2048kB
[97883.908600] 10093 total pagecache pages
[97883.909623] 2486 pages in swap cache
[97883.910981] Swap cache stats: add 5936545, delete 5934059, find 
11939248/14560523
[97883.911932] Free swap  = 1924040kB
[97883.912844] Total swap = 2064380kB
[97883.913799] 49018 pages RAM
[97883.915101] 0 pages HighMem/MovableOnly
[97883.916149] 10288 pages reserved
[97883.917465] 0 pages cma reserved
[97883.918528] 0 pages hwpoisoned
[97883.919635] [ pid ]   uid  tgid total_vm      rss nr_ptes nr_pmds 
swapents oom_score_adj name
[97883.919656] [  442]     0   442    15414      276      31 3       
89             0 systemd-journal
[97883.919661] [  479]     0   479    11179        0      22 3      
323         -1000 systemd-udevd
[97883.919666] [  535]     0   535    13888        0      28 3      
114         -1000 auditd
[97883.919671] [  559]    81   559    11565       85      26 3       
88          -900 dbus-daemon
[97883.919675] [  562]    70   562    12026        0      28 3      
108             0 avahi-daemon
[97883.919680] [  578]     0   578   182739       11     279 4      
263             0 rsyslogd
[97883.919684] [  579]     0   579    11890       26      27 3      
105             0 systemd-logind
[97883.919688] [  580]     0   580   123902      265     223 3     
1889             0 httpd
[97883.919693] [  581]    70   581    12026        0      26 3       
83             0 avahi-daemon
[97883.919697] [  596]     0   596     1095        0       8 3       
35             0 acpid
[97883.919701] [  614]     0   614    33234        1      18 4      
155             0 crond
[97883.919706] [  630]     0   630    29260        0       9 3       
32             0 agetty
[97883.919710] [  639]     0   639    25089       70      49 3      
430             0 sendmail
[97883.919715] [  643]     0   643    20785        0      43 3      
231         -1000 sshd
[97883.919719] [  674]    51   674    23428        0      46 3      
415             0 sendmail
[97883.919724] [  723]     0   723    44394      148      38 3     
2134             0 munin-node
[97883.919728] [ 2513]    38  2513     6971       23      18 3      
130             0 ntpd
[97883.919733] [13908]     0 13908    36690        0      74 3      
320             0 sshd
[97883.919738] [13910]     0 13910    15956        1      35 3      
235             0 systemd
[97883.919742] [13913]     0 13913    60419        0      49 4      
463             0 (sd-pam)
[97883.919747] [13918]     0 13918    36690      147      71 3      
280             0 sshd
[97883.919751] [13930]     0 13930    30730        1      13 4      
285             0 bash
[97883.919756] [13958]     0 13958    29971        0      13 3       
55             0 update.sh
[97883.919761] [13985]     0 13985   159639     4589     192 3    
26191             0 dnf
[97883.919766] [17393]    48 17393   177835      704     238 3     
1711             0 httpd
[97883.919771] [19018]    48 19018   128626     1434     222 3     
1342             0 httpd
[97883.919774] [19043]    48 19043   128067     2010     219 3     
1492             0 httpd
[97883.919776] Out of memory: Kill process 13985 (dnf) score 54 or 
sacrifice child
[97883.920895] Killed process 13985 (dnf) total-vm:638556kB, 
anon-rss:12840kB, file-rss:5516kB, shmem-rss:0kB
[97883.986808] oom_reaper: reaped process 13985 (dnf), now anon-rss:0kB, 
file-rss:1552kB, shmem-rss:0kB

Thank you.

Ciao,

Gerhard


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Re: Still OOM problems with 4.9er kernels

[Gerhard Wiesinger]

On 09.12.2016 16:52, Gerhard Wiesinger wrote:
> On 09.12.2016 14:40, Michal Hocko wrote:
>> On Fri 09-12-16 08:06:25, Gerhard Wiesinger wrote:
>>> Hello,
>>>
>>> same with latest kernel rc, dnf still killed with OOM (but sometimes
>>> better).
>>>
>>> ./update.sh: line 40:  1591 Killed                  ${EXE} update 
>>> ${PARAMS}
>>> (does dnf clean all;dnf update)
>>> Linux database.intern 4.9.0-0.rc8.git2.1.fc26.x86_64 #1 SMP Wed Dec 7
>>> 17:53:29 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
>>>
>>> Updated bug report:
>>> https://bugzilla.redhat.com/show_bug.cgi?id=1314697
>> Could you post your oom report please?
>
> E.g. a new one with more than one included, first one after boot ...
>
> Just setup a low mem VM under KVM and it is easily triggerable.
>
> Still enough virtual memory available ...
>
> 4.9.0-0.rc8.git2.1.fc26.x86_64
>
> [  624.862777] ksoftirqd/0: page allocation failure: order:0, 
> mode:0x2080020(GFP_ATOMIC)
> [  624.863319] CPU: 0 PID: 3 Comm: ksoftirqd/0 Not tainted 
> 4.9.0-0.rc8.git2.1.fc26.x86_64 #1
> [  624.863410] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), 
> BIOS 1.9.3
> [  624.863510]  ffffaa62c007f958 ffffffff904774e3 ffffffff90c7dd98 
> 0000000000000000
> [  624.863923]  ffffaa62c007f9e0 ffffffff9020e6ea 0208002000000246 
> ffffffff90c7dd98
> [  624.864019]  ffffaa62c007f980 ffff96b900000010 ffffaa62c007f9f0 
> ffffaa62c007f9a0
> [  624.864998] Call Trace:
> [  624.865149]  [<ffffffff904774e3>] dump_stack+0x86/0xc3
> [  624.865347]  [<ffffffff9020e6ea>] warn_alloc+0x13a/0x170
> [  624.865432]  [<ffffffff9020e9e2>] __alloc_pages_slowpath+0x252/0xbb0
> [  624.865563]  [<ffffffff9020f74d>] __alloc_pages_nodemask+0x40d/0x4b0
> [  624.865675]  [<ffffffff9020f983>] __alloc_page_frag+0x193/0x200
> [  624.866024]  [<ffffffff907a1d7e>] __napi_alloc_skb+0x8e/0xf0
> [  624.866113]  [<ffffffffc017777d>] page_to_skb.isra.28+0x5d/0x310 
> [virtio_net]
> [  624.866201]  [<ffffffffc01794cb>] virtnet_receive+0x2db/0x9a0 
> [virtio_net]
> [  624.867378]  [<ffffffffc0179bad>] virtnet_poll+0x1d/0x80 [virtio_net]
> [  624.867494]  [<ffffffff907b501e>] net_rx_action+0x23e/0x470
> [  624.867612]  [<ffffffff9091a8cd>] __do_softirq+0xcd/0x4b9
> [  624.867704]  [<ffffffff900dd164>] ? smpboot_thread_fn+0x34/0x1f0
> [  624.867833]  [<ffffffff900dd25d>] ? smpboot_thread_fn+0x12d/0x1f0
> [  624.867924]  [<ffffffff900b7c95>] run_ksoftirqd+0x25/0x80
> [  624.868109]  [<ffffffff900dd258>] smpboot_thread_fn+0x128/0x1f0
> [  624.868197]  [<ffffffff900dd130>] ? sort_range+0x30/0x30
> [  624.868596]  [<ffffffff900d82c2>] kthread+0x102/0x120
> [  624.868679]  [<ffffffff909117a0>] ? wait_for_completion+0x110/0x140
> [  624.868768]  [<ffffffff900d81c0>] ? kthread_park+0x60/0x60
> [  624.868850]  [<ffffffff90917afa>] ret_from_fork+0x2a/0x40
> [  843.528656] httpd (2490) used greatest stack depth: 10304 bytes left
> [  878.077750] httpd (2976) used greatest stack depth: 10096 bytes left
> [93918.861109] netstat (14579) used greatest stack depth: 9488 bytes left
> [94050.874669] kworker/dying (6253) used greatest stack depth: 9008 
> bytes left
> [95895.765570] kworker/1:1H: page allocation failure: order:0, 
> mode:0x2280020(GFP_ATOMIC|__GFP_NOTRACK)
> [95895.765819] CPU: 1 PID: 440 Comm: kworker/1:1H Not tainted 
> 4.9.0-0.rc8.git2.1.fc26.x86_64 #1
> [95895.765911] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), 
> BIOS 1.9.3
> [95895.766060] Workqueue: kblockd blk_mq_run_work_fn
> [95895.766143]  ffffaa62c0257628 ffffffff904774e3 ffffffff90c7dd98 
> 0000000000000000
> [95895.766235]  ffffaa62c02576b0 ffffffff9020e6ea 0228002000000046 
> ffffffff90c7dd98
> [95895.766325]  ffffaa62c0257650 ffff96b900000010 ffffaa62c02576c0 
> ffffaa62c0257670
> [95895.766417] Call Trace:
> [95895.766502]  [<ffffffff904774e3>] dump_stack+0x86/0xc3
> [95895.766596]  [<ffffffff9020e6ea>] warn_alloc+0x13a/0x170
> [95895.766681]  [<ffffffff9020e9e2>] __alloc_pages_slowpath+0x252/0xbb0
> [95895.766767]  [<ffffffff9020f74d>] __alloc_pages_nodemask+0x40d/0x4b0
> [95895.766866]  [<ffffffff9026db51>] alloc_pages_current+0xa1/0x1f0
> [95895.766971]  [<ffffffff90916f17>] ? _raw_spin_unlock+0x27/0x40
> [95895.767073]  [<ffffffff90278956>] new_slab+0x316/0x7c0
> [95895.767160]  [<ffffffff9027ae8b>] ___slab_alloc+0x3fb/0x5c0
> [95895.772611]  [<ffffffff9010b042>] ? cpuacct_charge+0xf2/0x1f0
> [95895.773406]  [<ffffffffc005850d>] ? 
> alloc_indirect.isra.11+0x1d/0x50 [virtio_ring]
> [95895.774327]  [<ffffffff901319d5>] ? rcu_read_lock_sched_held+0x45/0x80
> [95895.775212]  [<ffffffffc005850d>] ? 
> alloc_indirect.isra.11+0x1d/0x50 [virtio_ring]
> [95895.776155]  [<ffffffff9027b0a1>] __slab_alloc+0x51/0x90
> [95895.777090]  [<ffffffff9027d141>] __kmalloc+0x251/0x320
> [95895.781502]  [<ffffffffc005850d>] ? 
> alloc_indirect.isra.11+0x1d/0x50 [virtio_ring]
> [95895.782309]  [<ffffffffc005850d>] alloc_indirect.isra.11+0x1d/0x50 
> [virtio_ring]
> [95895.783334]  [<ffffffffc0059193>] virtqueue_add_sgs+0x1c3/0x4a0 
> [virtio_ring]
> [95895.784059]  [<ffffffff90068475>] ? kvm_sched_clock_read+0x25/0x40
> [95895.784742]  [<ffffffffc006665c>] __virtblk_add_req+0xbc/0x220 
> [virtio_blk]
> [95895.785419]  [<ffffffff901312fd>] ? 
> debug_lockdep_rcu_enabled+0x1d/0x20
> [95895.786086]  [<ffffffffc0066935>] ? virtio_queue_rq+0x105/0x290 
> [virtio_blk]
> [95895.786750]  [<ffffffffc006695d>] virtio_queue_rq+0x12d/0x290 
> [virtio_blk]
> [95895.787427]  [<ffffffff9045015d>] __blk_mq_run_hw_queue+0x26d/0x3b0
> [95895.788106]  [<ffffffff904502e2>] blk_mq_run_work_fn+0x12/0x20
> [95895.789065]  [<ffffffff900d097e>] process_one_work+0x23e/0x6f0
> [95895.789741]  [<ffffffff900d08fa>] ? process_one_work+0x1ba/0x6f0
> [95895.790444]  [<ffffffff900d0e7e>] worker_thread+0x4e/0x490
> [95895.791178]  [<ffffffff900d0e30>] ? process_one_work+0x6f0/0x6f0
> [95895.791911]  [<ffffffff900d0e30>] ? process_one_work+0x6f0/0x6f0
> [95895.792653]  [<ffffffff90003eec>] ? do_syscall_64+0x6c/0x1f0
> [95895.793397]  [<ffffffff900d82c2>] kthread+0x102/0x120
> [95895.794212]  [<ffffffff90111775>] ? 
> trace_hardirqs_on_caller+0xf5/0x1b0
> [95895.794942]  [<ffffffff900d81c0>] ? kthread_park+0x60/0x60
> [95895.795689]  [<ffffffff90917afa>] ret_from_fork+0x2a/0x40
> [95895.796408] Mem-Info:
> [95895.797110] active_anon:8800 inactive_anon:9030 isolated_anon:32
>                 active_file:263 inactive_file:238 isolated_file:0
>                 unevictable:0 dirty:0 writeback:330 unstable:0
>                 slab_reclaimable:5241 slab_unreclaimable:9538
>                 mapped:470 shmem:9 pagetables:2200 bounce:0
>                 free:690 free_pcp:68 free_cma:0
> [95895.801218] Node 0 active_anon:35200kB inactive_anon:36120kB 
> active_file:1052kB inactive_file:952kB unevictable:0kB 
> isolated(anon):128kB isolated(file):0kB mapped:1880kB dirty:0kB 
> writeback:1320kB shmem:0kB shmem_thp: 0kB shmem_pmdmapped: 0kB 
> anon_thp: 36kB writeback_tmp:0kB unstable:0kB pages_scanned:179 
> all_unreclaimable? no
> [95895.803264] Node 0 DMA free:924kB min:172kB low:212kB high:252kB 
> active_anon:3544kB inactive_anon:3944kB active_file:84kB 
> inactive_file:140kB unevictable:0kB writepending:4kB present:15992kB 
> managed:15908kB mlocked:0kB slab_reclaimable:1728kB 
> slab_unreclaimable:2964kB kernel_stack:84kB pagetables:1396kB 
> bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
> [95895.805936] lowmem_reserve[]: 0 117 117 117 117
> [95895.806751] Node 0 DMA32 free:1836kB min:1296kB low:1620kB 
> high:1944kB active_anon:31636kB inactive_anon:32164kB 
> active_file:968kB inactive_file:804kB unevictable:0kB 
> writepending:1288kB present:180080kB managed:139012kB mlocked:0kB 
> slab_reclaimable:19236kB slab_unreclaimable:35188kB 
> kernel_stack:1852kB pagetables:7404kB bounce:0kB free_pcp:272kB 
> local_pcp:156kB free_cma:0kB
> [95895.809223] lowmem_reserve[]: 0 0 0 0 0
> [95895.810071] Node 0 DMA: 36*4kB (H) 29*8kB (H) 22*16kB (H) 6*32kB 
> (H) 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 920kB
> [95895.812089] Node 0 DMA32: 77*4kB (H) 71*8kB (H) 28*16kB (H) 8*32kB 
> (H) 4*64kB (H) 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 
> 1836kB
> [95895.813979] Node 0 hugepages_total=0 hugepages_free=0 
> hugepages_surp=0 hugepages_size=2048kB
> [95895.813981] 1804 total pagecache pages
> [95895.814931] 1289 pages in swap cache
> [95895.815849] Swap cache stats: add 5288014, delete 5286725, find 
> 11568655/13881082
> [95895.816792] Free swap  = 1791816kB
> [95895.817706] Total swap = 2064380kB
> [95895.819222] 49018 pages RAM
> [95895.820145] 0 pages HighMem/MovableOnly
> [95895.821039] 10288 pages reserved
> [95895.823325] 0 pages cma reserved
> [95895.824244] 0 pages hwpoisoned
> [95895.825237] SLUB: Unable to allocate memory on node -1, 
> gfp=0x2080020(GFP_ATOMIC)
> [95895.826140]   cache: kmalloc-256, object size: 256, buffer size: 
> 256, default order: 0, min order: 0
> [95895.827034]   node 0: slabs: 113, objs: 1808, free: 0
> [97883.838418] httpd invoked oom-killer: 
> gfp_mask=0x24201ca(GFP_HIGHUSER_MOVABLE|__GFP_COLD), nodemask=0, 
> order=0, oom_score_adj=0
> [97883.843507] httpd cpuset=/ mems_allowed=0
> [97883.843601] CPU: 1 PID: 19043 Comm: httpd Not tainted 
> 4.9.0-0.rc8.git2.1.fc26.x86_64 #1
> [97883.844628] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), 
> BIOS 1.9.3
> [97883.845839]  ffffaa62c395f958 ffffffff904774e3 ffffaa62c395fb20 
> ffff96b98b8b3100
> [97883.846970]  ffffaa62c395f9e0 ffffffff902a8c41 0000000000000000 
> 0000000000000000
> [97883.848388]  ffffffff90ec6840 ffffaa62c395f990 ffffffff9011183d 
> ffffaa62c395f9b0
> [97883.849945] Call Trace:
> [97883.851366]  [<ffffffff904774e3>] dump_stack+0x86/0xc3
> [97883.852535]  [<ffffffff902a8c41>] dump_header+0x7b/0x24f
> [97883.853718]  [<ffffffff9011183d>] ? trace_hardirqs_on+0xd/0x10
> [97883.854857]  [<ffffffff902085d3>] oom_kill_process+0x203/0x3e0
> [97883.856192]  [<ffffffff90208afb>] out_of_memory+0x13b/0x580
> [97883.857334]  [<ffffffff90208bea>] ? out_of_memory+0x22a/0x580
> [97883.858590]  [<ffffffff9020f31a>] __alloc_pages_slowpath+0xb8a/0xbb0
> [97883.859706]  [<ffffffff9020f74d>] __alloc_pages_nodemask+0x40d/0x4b0
> [97883.860854]  [<ffffffff90037de9>] ? sched_clock+0x9/0x10
> [97883.862120]  [<ffffffff9026db51>] alloc_pages_current+0xa1/0x1f0
> [97883.863251]  [<ffffffff90201d96>] __page_cache_alloc+0x146/0x190
> [97883.864449]  [<ffffffff9020366c>] ? pagecache_get_page+0x2c/0x300
> [97883.865602]  [<ffffffff90206055>] filemap_fault+0x345/0x790
> [97883.866661]  [<ffffffff90206238>] ? filemap_fault+0x528/0x790
> [97883.867795]  [<ffffffff903639d9>] ext4_filemap_fault+0x39/0x50
> [97883.869289]  [<ffffffff90241ca3>] __do_fault+0x83/0x1d0
> [97883.870301]  [<ffffffff90246642>] handle_mm_fault+0x11e2/0x17a0
> [97883.871304]  [<ffffffff902454ba>] ? handle_mm_fault+0x5a/0x17a0
> [97883.872491]  [<ffffffff9006de16>] __do_page_fault+0x266/0x520
> [97883.873406]  [<ffffffff9006e1a8>] trace_do_page_fault+0x58/0x2a0
> [97883.874262]  [<ffffffff90067f3a>] do_async_page_fault+0x1a/0xa0
> [97883.875168]  [<ffffffff90918e28>] async_page_fault+0x28/0x30
> [97883.882611] Mem-Info:
> [97883.883747] active_anon:2915 inactive_anon:3376 isolated_anon:0
>                 active_file:3902 inactive_file:3639 isolated_file:0
>                 unevictable:0 dirty:205 writeback:0 unstable:0
>                 slab_reclaimable:9856 slab_unreclaimable:9682
>                 mapped:3722 shmem:59 pagetables:2080 bounce:0
>                 free:748 free_pcp:15 free_cma:0
> [97883.890766] Node 0 active_anon:11660kB inactive_anon:13504kB 
> active_file:15608kB inactive_file:14556kB unevictable:0kB 
> isolated(anon):0kB isolated(file):0kB mapped:14888kB dirty:820kB 
> writeback:0kB shmem:0kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 
> 236kB writeback_tmp:0kB unstable:0kB pages_scanned:168352 
> all_unreclaimable? yes
> [97883.893210] Node 0 DMA free:1468kB min:172kB low:212kB high:252kB 
> active_anon:1716kB inactive_anon:912kB active_file:2292kB 
> inactive_file:876kB unevictable:0kB writepending:24kB present:15992kB 
> managed:15908kB mlocked:0kB slab_reclaimable:4652kB 
> slab_unreclaimable:2852kB kernel_stack:76kB pagetables:496kB 
> bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
> [97883.898799] lowmem_reserve[]: 0 117 117 117 117
> [97883.899735] Node 0 DMA32 free:1524kB min:1296kB low:1620kB 
> high:1944kB active_anon:9944kB inactive_anon:12572kB 
> active_file:13316kB inactive_file:13680kB unevictable:0kB 
> writepending:768kB present:180080kB managed:139012kB mlocked:0kB 
> slab_reclaimable:34772kB slab_unreclaimable:35876kB 
> kernel_stack:1828kB pagetables:7824kB bounce:0kB free_pcp:60kB 
> local_pcp:52kB free_cma:0kB
> [97883.903033] lowmem_reserve[]: 0 0 0 0 0
> [97883.904371] Node 0 DMA: 36*4kB (H) 29*8kB (H) 22*16kB (H) 9*32kB 
> (H) 3*64kB (H) 2*128kB (H) 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB 
> = 1464kB
> [97883.906442] Node 0 DMA32: 13*4kB (H) 4*8kB (H) 13*16kB (H) 8*32kB 
> (H) 9*64kB (H) 1*128kB (H) 1*256kB (H) 0*512kB 0*1024kB 0*2048kB 
> 0*4096kB = 1508kB
> [97883.908598] Node 0 hugepages_total=0 hugepages_free=0 
> hugepages_surp=0 hugepages_size=2048kB
> [97883.908600] 10093 total pagecache pages
> [97883.909623] 2486 pages in swap cache
> [97883.910981] Swap cache stats: add 5936545, delete 5934059, find 
> 11939248/14560523
> [97883.911932] Free swap  = 1924040kB
> [97883.912844] Total swap = 2064380kB
> [97883.913799] 49018 pages RAM
> [97883.915101] 0 pages HighMem/MovableOnly
> [97883.916149] 10288 pages reserved
> [97883.917465] 0 pages cma reserved
> [97883.918528] 0 pages hwpoisoned
> [97883.919635] [ pid ]   uid  tgid total_vm      rss nr_ptes nr_pmds 
> swapents oom_score_adj name
> [97883.919656] [  442]     0   442    15414      276      31 3       
> 89             0 systemd-journal
> [97883.919661] [  479]     0   479    11179        0      22 3      
> 323         -1000 systemd-udevd
> [97883.919666] [  535]     0   535    13888        0      28 3      
> 114         -1000 auditd
> [97883.919671] [  559]    81   559    11565       85      26 3       
> 88          -900 dbus-daemon
> [97883.919675] [  562]    70   562    12026        0      28 3      
> 108             0 avahi-daemon
> [97883.919680] [  578]     0   578   182739       11     279 4      
> 263             0 rsyslogd
> [97883.919684] [  579]     0   579    11890       26      27 3      
> 105             0 systemd-logind
> [97883.919688] [  580]     0   580   123902      265     223 3 
> 1889             0 httpd
> [97883.919693] [  581]    70   581    12026        0      26 3       
> 83             0 avahi-daemon
> [97883.919697] [  596]     0   596     1095        0       8 3       
> 35             0 acpid
> [97883.919701] [  614]     0   614    33234        1      18 4      
> 155             0 crond
> [97883.919706] [  630]     0   630    29260        0       9 3       
> 32             0 agetty
> [97883.919710] [  639]     0   639    25089       70      49 3      
> 430             0 sendmail
> [97883.919715] [  643]     0   643    20785        0      43 3      
> 231         -1000 sshd
> [97883.919719] [  674]    51   674    23428        0      46 3      
> 415             0 sendmail
> [97883.919724] [  723]     0   723    44394      148      38 3 
> 2134             0 munin-node
> [97883.919728] [ 2513]    38  2513     6971       23      18 3      
> 130             0 ntpd
> [97883.919733] [13908]     0 13908    36690        0      74 3      
> 320             0 sshd
> [97883.919738] [13910]     0 13910    15956        1      35 3      
> 235             0 systemd
> [97883.919742] [13913]     0 13913    60419        0      49 4      
> 463             0 (sd-pam)
> [97883.919747] [13918]     0 13918    36690      147      71 3      
> 280             0 sshd
> [97883.919751] [13930]     0 13930    30730        1      13 4      
> 285             0 bash
> [97883.919756] [13958]     0 13958    29971        0      13 3       
> 55             0 update.sh
> [97883.919761] [13985]     0 13985   159639     4589     192 3 
> 26191             0 dnf
> [97883.919766] [17393]    48 17393   177835      704     238 3 
> 1711             0 httpd
> [97883.919771] [19018]    48 19018   128626     1434     222 3 
> 1342             0 httpd
> [97883.919774] [19043]    48 19043   128067     2010     219 3 
> 1492             0 httpd
> [97883.919776] Out of memory: Kill process 13985 (dnf) score 54 or 
> sacrifice child
> [97883.920895] Killed process 13985 (dnf) total-vm:638556kB, 
> anon-rss:12840kB, file-rss:5516kB, shmem-rss:0kB
> [97883.986808] oom_reaper: reaped process 13985 (dnf), now 
> anon-rss:0kB, file-rss:1552kB, shmem-rss:0kB
>

Forgot to mention:
rpm DB is also mostly not usable afterwards, needs reboot:
error: rpmdb: BDB0113 Thread/process 13985/140089649317632 failed: 
BDB1507 Thread died in Berkeley DB library
error: db5 error(-30973) from dbenv->failchk: BDB0087 DB_RUNRECOVERY: 
Fatal error, run database recovery
error: cannot open Packages index using db5 -  (-30973)
error: cannot open Packages database in /var/lib/rpm
Error: Error: rpmdb open failed


Thank you.

Ciao,

Gerhard


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Re: Still OOM problems with 4.9er kernels

[Michal Hocko]

On Fri 09-12-16 16:52:07, Gerhard Wiesinger wrote:
> On 09.12.2016 14:40, Michal Hocko wrote:
> > On Fri 09-12-16 08:06:25, Gerhard Wiesinger wrote:
> > > Hello,
> > > 
> > > same with latest kernel rc, dnf still killed with OOM (but sometimes
> > > better).
> > > 
> > > ./update.sh: line 40:  1591 Killed                  ${EXE} update ${PARAMS}
> > > (does dnf clean all;dnf update)
> > > Linux database.intern 4.9.0-0.rc8.git2.1.fc26.x86_64 #1 SMP Wed Dec 7
> > > 17:53:29 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
> > > 
> > > Updated bug report:
> > > https://bugzilla.redhat.com/show_bug.cgi?id=1314697
> > Could you post your oom report please?
> 
> E.g. a new one with more than one included, first one after boot ...
> 
> Just setup a low mem VM under KVM and it is easily triggerable.

What is the workload?

> Still enough virtual memory available ...

Well, you will always have a lot of virtual memory...

> 4.9.0-0.rc8.git2.1.fc26.x86_64
> 
> [  624.862777] ksoftirqd/0: page allocation failure: order:0, mode:0x2080020(GFP_ATOMIC)
[...]
> [95895.765570] kworker/1:1H: page allocation failure: order:0, mode:0x2280020(GFP_ATOMIC|__GFP_NOTRACK)

These are atomic allocation failures and should be recoverable.
[...]

> [97883.838418] httpd invoked oom-killer:  gfp_mask=0x24201ca(GFP_HIGHUSER_MOVABLE|__GFP_COLD), nodemask=0, order=0,  oom_score_adj=0

But this is a real OOM killer invocation because a single page allocation
cannot proceed.

[...]
> [97883.882611] Mem-Info:
> [97883.883747] active_anon:2915 inactive_anon:3376 isolated_anon:0
>                 active_file:3902 inactive_file:3639 isolated_file:0
>                 unevictable:0 dirty:205 writeback:0 unstable:0
>                 slab_reclaimable:9856 slab_unreclaimable:9682
>                 mapped:3722 shmem:59 pagetables:2080 bounce:0
>                 free:748 free_pcp:15 free_cma:0

there is still some page cache which doesn't seem to be neither dirty
nor under writeback. So it should be theoretically reclaimable but for
some reason we cannot seem to reclaim that memory.
There is still some anonymous memory and free swap so we could reclaim
it as well but it all seems pretty down and the memory pressure is
really large

> [97883.890766] Node 0 active_anon:11660kB inactive_anon:13504kB
> active_file:15608kB inactive_file:14556kB unevictable:0kB isolated(anon):0kB
> isolated(file):0kB mapped:14888kB dirty:820kB writeback:0kB shmem:0kB
> shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 236kB writeback_tmp:0kB
> unstable:0kB pages_scanned:168352 all_unreclaimable? yes

all_unreclaimable also agrees that basically nothing is reclaimable.
That was one of the criterion to hit the OOM killer prior to the rewrite
in 4.6 kernel. So I suspect that older kernels would OOM under your
memory pressure as well.
-- 
Michal Hocko
SUSE Labs

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Re: Still OOM problems with 4.9er kernels

[Gerhard Wiesinger]

On 09.12.2016 17:09, Michal Hocko wrote:
> On Fri 09-12-16 16:52:07, Gerhard Wiesinger wrote:
>> On 09.12.2016 14:40, Michal Hocko wrote:
>>> On Fri 09-12-16 08:06:25, Gerhard Wiesinger wrote:
>>>> Hello,
>>>>
>>>> same with latest kernel rc, dnf still killed with OOM (but sometimes
>>>> better).
>>>>
>>>> ./update.sh: line 40:  1591 Killed                  ${EXE} update ${PARAMS}
>>>> (does dnf clean all;dnf update)
>>>> Linux database.intern 4.9.0-0.rc8.git2.1.fc26.x86_64 #1 SMP Wed Dec 7
>>>> 17:53:29 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
>>>>
>>>> Updated bug report:
>>>> https://bugzilla.redhat.com/show_bug.cgi?id=1314697
>>> Could you post your oom report please?
>> E.g. a new one with more than one included, first one after boot ...
>>
>> Just setup a low mem VM under KVM and it is easily triggerable.
> What is the workload?

just run dnf clean all;dnf update
(and the other tasks running on those machine. The normal load on most 
of these machines is pretty VERY LOW, e.g. running just an apache httpd 
doing nothing or e.g. running samba domain controller doing nothing)

So my setups are low mem VMs so that KVM host has most of the caching 
effects shared.

I'm running this setup since Fedora 17 under kernel-3.3.4-5.fc17.x86_64 
and had NO problems.

Problems started with 4.4.3-300.fc23.x86_64 and got worser in each major 
kernel versions (for upgrades I had even give the VMs temporarilly more 
memory for the upgrade situation).
(from my bug report at
https://bugzilla.redhat.com/show_bug.cgi?id=1314697
Previous kernel version on guest/host was rocket stable. Revert to 
kernel-4.3.5-300.fc23.x86_64 also solved it.)

For completeness the actual kernel parameters on all hosts and VMs.
vm.dirty_background_ratio=3
vm.dirty_ratio=15
vm.overcommit_memory=2
vm.overcommit_ratio=80
vm.swappiness=10

With kernel 4.9.0rc7 or rc8 it was getting better. But still not there 
where it should be (and was already).

>
>> Still enough virtual memory available ...
> Well, you will always have a lot of virtual memory...

And why is it not used, e.g. swapped and gets into an OOM situation?

>
>> 4.9.0-0.rc8.git2.1.fc26.x86_64
>>
>> [  624.862777] ksoftirqd/0: page allocation failure: order:0, mode:0x2080020(GFP_ATOMIC)
> [...]
>> [95895.765570] kworker/1:1H: page allocation failure: order:0, mode:0x2280020(GFP_ATOMIC|__GFP_NOTRACK)
> These are atomic allocation failures and should be recoverable.
> [...]
>
>> [97883.838418] httpd invoked oom-killer:  gfp_mask=0x24201ca(GFP_HIGHUSER_MOVABLE|__GFP_COLD), nodemask=0, order=0,  oom_score_adj=0
> But this is a real OOM killer invocation because a single page allocation
> cannot proceed.
>
> [...]
>> [97883.882611] Mem-Info:
>> [97883.883747] active_anon:2915 inactive_anon:3376 isolated_anon:0
>>                  active_file:3902 inactive_file:3639 isolated_file:0
>>                  unevictable:0 dirty:205 writeback:0 unstable:0
>>                  slab_reclaimable:9856 slab_unreclaimable:9682
>>                  mapped:3722 shmem:59 pagetables:2080 bounce:0
>>                  free:748 free_pcp:15 free_cma:0
> there is still some page cache which doesn't seem to be neither dirty
> nor under writeback. So it should be theoretically reclaimable but for
> some reason we cannot seem to reclaim that memory.
> There is still some anonymous memory and free swap so we could reclaim
> it as well but it all seems pretty down and the memory pressure is
> really large

Yes, it might be large on the update situation, but that should be 
handled by a virtual memory system by the kernel, right?

>
>> [97883.890766] Node 0 active_anon:11660kB inactive_anon:13504kB
>> active_file:15608kB inactive_file:14556kB unevictable:0kB isolated(anon):0kB
>> isolated(file):0kB mapped:14888kB dirty:820kB writeback:0kB shmem:0kB
>> shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 236kB writeback_tmp:0kB
>> unstable:0kB pages_scanned:168352 all_unreclaimable? yes
> all_unreclaimable also agrees that basically nothing is reclaimable.
> That was one of the criterion to hit the OOM killer prior to the rewrite
> in 4.6 kernel. So I suspect that older kernels would OOM under your
> memory pressure as well.


See comments above.

Thnx.


Ciao,

Gerhard

Re: Still OOM problems with 4.9er kernels

[Michal Hocko]

On Fri 09-12-16 17:58:14, Gerhard Wiesinger wrote:
> On 09.12.2016 17:09, Michal Hocko wrote:
[...]
> > > [97883.882611] Mem-Info:
> > > [97883.883747] active_anon:2915 inactive_anon:3376 isolated_anon:0
> > >                  active_file:3902 inactive_file:3639 isolated_file:0
> > >                  unevictable:0 dirty:205 writeback:0 unstable:0
> > >                  slab_reclaimable:9856 slab_unreclaimable:9682
> > >                  mapped:3722 shmem:59 pagetables:2080 bounce:0
> > >                  free:748 free_pcp:15 free_cma:0
> > there is still some page cache which doesn't seem to be neither dirty
> > nor under writeback. So it should be theoretically reclaimable but for
> > some reason we cannot seem to reclaim that memory.
> > There is still some anonymous memory and free swap so we could reclaim
> > it as well but it all seems pretty down and the memory pressure is
> > really large
> 
> Yes, it might be large on the update situation, but that should be handled
> by a virtual memory system by the kernel, right?

Well this is what we try and call it memory reclaim. But if we are not
able to reclaim anything then we eventually have to give up and trigger
the OOM killer. Now the information that 4.4 made a difference is
interesting. I do not really see any major differences in the reclaim
between 4.3 and 4.4 kernels. The reason might be somewhere else as well.
E.g. some of the subsystem consumes much more memory than before.

Just curious, what kind of filesystem are you using? Could you try some
additional debugging. Enabling reclaim related tracepoints might tell us
more. The following should tell us more
mount -t tracefs none /trace
echo 1 > /trace/events/vmscan/enable
echo 1 > /trace/events/writeback/writeback_congestion_wait/enable
cat /trace/trace_pipe > trace.log

Collecting /proc/vmstat over time might be helpful as well
mkdir logs
while true
do
	cp /proc/vmstat vmstat.$(date +%s)
	sleep 1s
done
-- 
Michal Hocko
SUSE Labs

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Re: Still OOM problems with 4.9er kernels

[Gerhard Wiesinger]

On 09.12.2016 18:30, Michal Hocko wrote:
> On Fri 09-12-16 17:58:14, Gerhard Wiesinger wrote:
>> On 09.12.2016 17:09, Michal Hocko wrote:
> [...]
>>>> [97883.882611] Mem-Info:
>>>> [97883.883747] active_anon:2915 inactive_anon:3376 isolated_anon:0
>>>>                   active_file:3902 inactive_file:3639 isolated_file:0
>>>>                   unevictable:0 dirty:205 writeback:0 unstable:0
>>>>                   slab_reclaimable:9856 slab_unreclaimable:9682
>>>>                   mapped:3722 shmem:59 pagetables:2080 bounce:0
>>>>                   free:748 free_pcp:15 free_cma:0
>>> there is still some page cache which doesn't seem to be neither dirty
>>> nor under writeback. So it should be theoretically reclaimable but for
>>> some reason we cannot seem to reclaim that memory.
>>> There is still some anonymous memory and free swap so we could reclaim
>>> it as well but it all seems pretty down and the memory pressure is
>>> really large
>> Yes, it might be large on the update situation, but that should be handled
>> by a virtual memory system by the kernel, right?
> Well this is what we try and call it memory reclaim. But if we are not
> able to reclaim anything then we eventually have to give up and trigger
> the OOM killer.

I'm not familiar with the Linux implementation of the VM system in 
detail. But can't you reserve as much memory for the kernel (non 
pageable) at least that you can swap everything out (even without 
killing a process at least as long there is enough swap available, which 
should be in all of my cases)?


>   Now the information that 4.4 made a difference is
> interesting. I do not really see any major differences in the reclaim
> between 4.3 and 4.4 kernels. The reason might be somewhere else as well.
> E.g. some of the subsystem consumes much more memory than before.
>
> Just curious, what kind of filesystem are you using?

I'm using ext4 only with virt-* drivers (storage, network). But it is 
definitly a virtual memory allocation/swap usage issue.

>   Could you try some
> additional debugging. Enabling reclaim related tracepoints might tell us
> more. The following should tell us more
> mount -t tracefs none /trace
> echo 1 > /trace/events/vmscan/enable
> echo 1 > /trace/events/writeback/writeback_congestion_wait/enable
> cat /trace/trace_pipe > trace.log
>
> Collecting /proc/vmstat over time might be helpful as well
> mkdir logs
> while true
> do
> 	cp /proc/vmstat vmstat.$(date +%s)
> 	sleep 1s
> done

Activated it. But I think it should be very easy to trigger also on your 
side. A very small configured VM with a program running RAM 
allocations/writes (I guess you have some testing programs already) 
should be sufficient to trigger it. You can also use the attached 
program which I used to trigger such situations some years ago. If it 
doesn't help try to reduce the available CPU for the VM and also I/O 
(e.g. use all CPU/IO on the host or other VMs).

BTW: Don't know if you have seen also my original message on the kernel 
mailinglist only:

Linus had also OOM problems with 1kB RAM requests and a lot of free RAM 
(use a translation service for the german page):
https://lkml.org/lkml/2016/11/30/64
https://marius.bloggt-in-braunschweig.de/2016/11/17/linuxkernel-4-74-8-und-der-oom-killer/
https://www.spinics.net/lists/linux-mm/msg113661.html

Thnx.

Ciao,
Gerhard

// mallocsleep.c
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>

typedef unsigned int BOOL;
typedef char* PCHAR;
typedef unsigned int DWORD;
typedef unsigned long DDWORD;

#define FALSE 0
#define TRUE 1

BOOL getlong(PCHAR s, DDWORD* retvalue)
{
   char *eptr;
   long value;

   value=strtoll(s,&eptr,0);
   if ((eptr == s)||(*eptr != '\0')) return FALSE;
   if (value < 0) return FALSE;
   *retvalue = value;
   return TRUE;
}

int main(int argc, char* argv[])
{
   unsigned long* p;
   unsigned long size = 16*1024*1024;
   unsigned long size_of = sizeof(*p);
   unsigned long i;
   unsigned long sleep_allocated = 3600;
   unsigned long sleep_freed = 3600;

   if (argc > 1)
   {
     if (!getlong(argv[1], &size))
     {
       printf("Wrong memsize!\n");
       exit(1);
     }
   }

   if (argc > 2)
   {
     if (!getlong(argv[2], &sleep_allocated))
     {
       printf("Wrong sleep_allocated time!\n");
       exit(1);
     }
   }

   if (argc > 3)
   {
     if (!getlong(argv[3], &sleep_freed))
     {
       printf("Wrong sleep_freed time!\n");
       exit(1);
     }
   }

   printf("size=%lu, size_of=%lu\n", size, size_of);
   fflush(stdout);

   p = malloc(size);
   if (!p)
   {
     printf("Could not allocate memory!\n");
     exit(2);
   }

   printf("malloc done, writing to memory, p=%p ...\n", (void*)p);
   fflush(stdout);

   for(i = 0;i < (size/size_of);i++) p[i]=i;

   printf("writing to memory done, sleeping for %lu seconds ...\n", 
sleep_allocated);
   fflush(stdout);

   sleep(sleep_allocated);

   printf("sleeping done, freeing ...\n");
   fflush(stdout);

   free(p);

   printf("freeing done, sleeping for %lu seconds ...\n", sleep_freed);
   fflush(stdout);

   sleep(sleep_freed);

   printf("sleeping done, exitiing ...\n");
   fflush(stdout);

   exit(0);
   return 0;
}


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Re: Still OOM problems with 4.9er kernels

[Vlastimil Babka]

On 12/09/2016 07:01 PM, Gerhard Wiesinger wrote:
> On 09.12.2016 18:30, Michal Hocko wrote:
>> On Fri 09-12-16 17:58:14, Gerhard Wiesinger wrote:
>>> On 09.12.2016 17:09, Michal Hocko wrote:
>> [...]
>>>>> [97883.882611] Mem-Info:
>>>>> [97883.883747] active_anon:2915 inactive_anon:3376 isolated_anon:0
>>>>>                   active_file:3902 inactive_file:3639 isolated_file:0
>>>>>                   unevictable:0 dirty:205 writeback:0 unstable:0
>>>>>                   slab_reclaimable:9856 slab_unreclaimable:9682
>>>>>                   mapped:3722 shmem:59 pagetables:2080 bounce:0
>>>>>                   free:748 free_pcp:15 free_cma:0
>>>> there is still some page cache which doesn't seem to be neither dirty
>>>> nor under writeback. So it should be theoretically reclaimable but for
>>>> some reason we cannot seem to reclaim that memory.
>>>> There is still some anonymous memory and free swap so we could reclaim
>>>> it as well but it all seems pretty down and the memory pressure is
>>>> really large
>>> Yes, it might be large on the update situation, but that should be handled
>>> by a virtual memory system by the kernel, right?
>> Well this is what we try and call it memory reclaim. But if we are not
>> able to reclaim anything then we eventually have to give up and trigger
>> the OOM killer.
> 
> I'm not familiar with the Linux implementation of the VM system in 
> detail. But can't you reserve as much memory for the kernel (non 
> pageable) at least that you can swap everything out (even without 
> killing a process at least as long there is enough swap available, which 
> should be in all of my cases)?

We don't have such bulletproof reserves. In this case the amount of
anonymous memory that can be swapped out is relatively low, and either
something is pinning it in memory, or it's being swapped back in quickly.

>>   Now the information that 4.4 made a difference is
>> interesting. I do not really see any major differences in the reclaim
>> between 4.3 and 4.4 kernels. The reason might be somewhere else as well.
>> E.g. some of the subsystem consumes much more memory than before.
>>
>> Just curious, what kind of filesystem are you using?
> 
> I'm using ext4 only with virt-* drivers (storage, network). But it is 
> definitly a virtual memory allocation/swap usage issue.
> 
>>   Could you try some
>> additional debugging. Enabling reclaim related tracepoints might tell us
>> more. The following should tell us more
>> mount -t tracefs none /trace
>> echo 1 > /trace/events/vmscan/enable
>> echo 1 > /trace/events/writeback/writeback_congestion_wait/enable
>> cat /trace/trace_pipe > trace.log
>>
>> Collecting /proc/vmstat over time might be helpful as well
>> mkdir logs
>> while true
>> do
>> 	cp /proc/vmstat vmstat.$(date +%s)
>> 	sleep 1s
>> done
> 
> Activated it. But I think it should be very easy to trigger also on your 
> side. A very small configured VM with a program running RAM 
> allocations/writes (I guess you have some testing programs already) 
> should be sufficient to trigger it. You can also use the attached 
> program which I used to trigger such situations some years ago. If it 
> doesn't help try to reduce the available CPU for the VM and also I/O 
> (e.g. use all CPU/IO on the host or other VMs).

Well it's not really a surprise that if the VM is small enough and
workload large enough, OOM killer will kick in. The exact threshold
might have changed between kernel versions for a number of possible reasons.

> 
> BTW: Don't know if you have seen also my original message on the kernel 
> mailinglist only:
> 
> Linus had also OOM problems with 1kB RAM requests and a lot of free RAM 
> (use a translation service for the german page):
> https://lkml.org/lkml/2016/11/30/64
> https://marius.bloggt-in-braunschweig.de/2016/11/17/linuxkernel-4-74-8-und-der-oom-killer/
> https://www.spinics.net/lists/linux-mm/msg113661.html

Yeah we were involved in the last one. The regressions were about
high-order allocations
though (the 1kB premise turned out to be misinterpretation) and there
were regressions
for those in 4.7/4.8. But yours are order-0.


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Re: Still OOM problems with 4.9er kernels

[Gerhard Wiesinger]

On 09.12.2016 22:42, Vlastimil Babka wrote:
> On 12/09/2016 07:01 PM, Gerhard Wiesinger wrote:
>> On 09.12.2016 18:30, Michal Hocko wrote:
>>> On Fri 09-12-16 17:58:14, Gerhard Wiesinger wrote:
>>>> On 09.12.2016 17:09, Michal Hocko wrote:
>>> [...]
>>>>>> [97883.882611] Mem-Info:
>>>>>> [97883.883747] active_anon:2915 inactive_anon:3376 isolated_anon:0
>>>>>>                    active_file:3902 inactive_file:3639 isolated_file:0
>>>>>>                    unevictable:0 dirty:205 writeback:0 unstable:0
>>>>>>                    slab_reclaimable:9856 slab_unreclaimable:9682
>>>>>>                    mapped:3722 shmem:59 pagetables:2080 bounce:0
>>>>>>                    free:748 free_pcp:15 free_cma:0
>>>>> there is still some page cache which doesn't seem to be neither dirty
>>>>> nor under writeback. So it should be theoretically reclaimable but for
>>>>> some reason we cannot seem to reclaim that memory.
>>>>> There is still some anonymous memory and free swap so we could reclaim
>>>>> it as well but it all seems pretty down and the memory pressure is
>>>>> really large
>>>> Yes, it might be large on the update situation, but that should be handled
>>>> by a virtual memory system by the kernel, right?
>>> Well this is what we try and call it memory reclaim. But if we are not
>>> able to reclaim anything then we eventually have to give up and trigger
>>> the OOM killer.
>> I'm not familiar with the Linux implementation of the VM system in
>> detail. But can't you reserve as much memory for the kernel (non
>> pageable) at least that you can swap everything out (even without
>> killing a process at least as long there is enough swap available, which
>> should be in all of my cases)?
> We don't have such bulletproof reserves. In this case the amount of
> anonymous memory that can be swapped out is relatively low, and either
> something is pinning it in memory, or it's being swapped back in quickly.
>
>>>    Now the information that 4.4 made a difference is
>>> interesting. I do not really see any major differences in the reclaim
>>> between 4.3 and 4.4 kernels. The reason might be somewhere else as well.
>>> E.g. some of the subsystem consumes much more memory than before.
>>>
>>> Just curious, what kind of filesystem are you using?
>> I'm using ext4 only with virt-* drivers (storage, network). But it is
>> definitly a virtual memory allocation/swap usage issue.
>>
>>>    Could you try some
>>> additional debugging. Enabling reclaim related tracepoints might tell us
>>> more. The following should tell us more
>>> mount -t tracefs none /trace
>>> echo 1 > /trace/events/vmscan/enable
>>> echo 1 > /trace/events/writeback/writeback_congestion_wait/enable
>>> cat /trace/trace_pipe > trace.log
>>>
>>> Collecting /proc/vmstat over time might be helpful as well
>>> mkdir logs
>>> while true
>>> do
>>> 	cp /proc/vmstat vmstat.$(date +%s)
>>> 	sleep 1s
>>> done
>> Activated it. But I think it should be very easy to trigger also on your
>> side. A very small configured VM with a program running RAM
>> allocations/writes (I guess you have some testing programs already)
>> should be sufficient to trigger it. You can also use the attached
>> program which I used to trigger such situations some years ago. If it
>> doesn't help try to reduce the available CPU for the VM and also I/O
>> (e.g. use all CPU/IO on the host or other VMs).
> Well it's not really a surprise that if the VM is small enough and
> workload large enough, OOM killer will kick in. The exact threshold
> might have changed between kernel versions for a number of possible reasons.

IMHO: The OOM killer should NOT kick in even on the highest workloads if 
there is swap available.

https://www.spinics.net/lists/linux-mm/msg113665.html

Yeah, but I do think that "oom when you have 156MB free and 7GB
reclaimable, and haven't even tried swapping" counts as obviously
wrong.

So Linus also thinks that trying swapping is a must have. And there always was enough swap available in my cases. Then it should swap out/swapin all the time (which worked well in kernel 2.4/2.6 times).

Another topic: Why does the kernel prefer to swap in/swap out instead of 
use cache pages/buffers (see vmstat 1 output below)?


>
>> BTW: Don't know if you have seen also my original message on the kernel
>> mailinglist only:
>>
>> Linus had also OOM problems with 1kB RAM requests and a lot of free RAM
>> (use a translation service for the german page):
>> https://lkml.org/lkml/2016/11/30/64
>> https://marius.bloggt-in-braunschweig.de/2016/11/17/linuxkernel-4-74-8-und-der-oom-killer/
>> https://www.spinics.net/lists/linux-mm/msg113661.html
> Yeah we were involved in the last one. The regressions were about
> high-order allocations
> though (the 1kB premise turned out to be misinterpretation) and there
> were regressions
> for those in 4.7/4.8. But yours are order-0.
>

With kernel 4.7./4.8 it was really reaproduceable at every dnf update. 
With 4.9rc8 it has been much much better. So something must have 
changed, too.

As far as I understood it the order is 2^order kB pagesize. I don't 
think it makes a difference when swap is not used which order the memory 
allocation request is.

BTW: What were the commit that introduced the regression anf fixed it in 
4.9?

Thnx.

Ciao,

Gerhard


procs -----------memory---------- ---swap-- -----io---- -system-- 
------cpu-----
  r  b   swpd   free   buff  cache   si   so    bi    bo in   cs us sy 
id wa st
  3  0  45232   9252   1956 109644  428  232  3536   416 4310 4228 38 36 
14  7  6
  2  0  45124  10524   1960 110192  124    0   528    96 2478 2243 45 29 
20  5  1
  4  1  45136   3896   1968 114388   84   64  4824   260 2689 2655 38 31 
15 12  4
  1  1  45484  10648    288 114032   88  356 20028  1132 5078 5122 24 
45  4 21  5
  2  0  44700   8092   1240 115204  728    0  2624   536 4204 4413 38 38 
18  3  4
  2  0  44852  10272   1240 111324   52  212  2736  1548 3311 2970 41 36 
12  9  2
  4  0  44844  10716   1240 111216    8    0     8    72 3067 3287 42 30 
18  7  3
  3  0  44828  10268   1248 111280   16    0    16    60 2139 1610 43 29 
11  1 17
  1  0  44828  11644   1248 111192    0    0     0     0 2367 1911 50 32 
14  0  3
  4  0  44820   9004   1248 111284    8    0     8     0 2207 1867 55 31 
14  0  1
  7  0  45664   6360   1816 109264   20  868  3076   968 4122 3783 43 37 
17  0  3
  4  4  46880   6732   1092 101960  244 1332  7968  3352 5836 6431 17 
51  1 27  4
10  2  47064   6940   1364  96340   20  196 25708  1720 7346 6447 13 70  
0 18  1
15  3  47572   3672   2156  92604   68  580 29244  1692 5640 5102  5 57  
0 37  2
12  4  48300   6740    352  87924   80  948 36208  2948 7287 7955  7 73  
0 18  2
12  9  50796   4832    584  88372    0 2496 16064  3312 3425 4185  2 30  
0 66  1
10  9  52636   3608   2068  90132   56 1840 24552  2836 4123 4099  3 43  
0 52  1
  7 11  56740  10376    424  86204  184 4152 33116  5628 7949 7952  4 
67  0 23  6
10  4  61384   8000    776  86956  644 4784 28380  5484 7965 9935  7 64  
0 26  2
11  4  68052   5260   1028  87268 1244 7164 23380  8684 10715 10863  8 
71  0 20  1
11  2  72244   3924   1052  85160  980 4264 23756  4940 7231 7930  8 62  
0 29  1
  6  1  76388   5352   4948  86204 1292 4640 27380  5244 7816 8714 10 
63  0 22  5
  8  5  77376   4168   1944  86528 3064 3684 19876  4104 9325 9076  9 
64  1 22  4
  5  4  75464   7272   1240  81684 3912 3188 25656  4100 9973 10515 11 
65  0 20  4
  5  2  77364   4440   1852  84744  528 2304 28588  3304 6605 6311  7 
61  8 18  4
  9  2  81648   3760   3188  86012  440 4588 17928  5368 6377 6320  8 
48  2 40  4
  6  2  82404   6608    668  86092 2016 2084 24396  3564 7440 7510  8 
66  1 20  4
  4  4  81728   3796   2260  87764 1392  984 18512  1684 5196 4652  6 
48  0 42  4
  8  4  84700   6436   1428  85744 1188 3708 20256  4364 6405 5998  9 
63  0 24  4
  3  1  86360   4836    924  87700 1388 2692 19460  3504 5498 6117  8 
48  0 34  9
  4  4  87916   3768    176  86592 2788 3220 19664  4032 7285 8342 19 
63  0 10  9
  4  4  89612   4952    180  88076 1516 2988 17560  3936 5737 5794  7 
46  0 37 10
  7  5  87768  12244    196  87856 3344 2544 22248  3348 6934 7497  8 
59  0 22 10
10  1  83436   4768    840  96452 4096  836 20100  1160 6191 6614 21 52  
0 13 14
  0  6  82868   6972    348  91020 1108  520  4896   568 3274 4214 11 26 
29 30  4

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Re: Still OOM problems with 4.9er kernels

[Michal Hocko]

On Sat 10-12-16 14:50:34, Gerhard Wiesinger wrote:
[...]
> IMHO: The OOM killer should NOT kick in even on the highest workloads if
> there is swap available.

This is not so simple. Take a heavy swap trashing situation as an
example. You still have a lot of swap space and an anonymous memory
which can be swapped out but if the workload simply keeps refaulting
the swapped out memory all the time then you can barely make any further
progress and end up in the swap IO hell. Invoking the OOM killer in such
a situation would be a relief to make the system usable again.

> https://www.spinics.net/lists/linux-mm/msg113665.html
> 
> Yeah, but I do think that "oom when you have 156MB free and 7GB
> reclaimable, and haven't even tried swapping" counts as obviously
> wrong.

No question about this part of course.

> So Linus also thinks that trying swapping is a must have. And there
> always was enough swap available in my cases. Then it should swap
> out/swapin all the time (which worked well in kernel 2.4/2.6 times).
> 
> Another topic: Why does the kernel prefer to swap in/swap out instead of use
> cache pages/buffers (see vmstat 1 output below)?

In the vast majority cases it is quite contrary. We heavily bias page
cache reclaim in favor of the anonymous memory. Have a look at
get_scan_count function which determines the balance.

I would need to see /proc/vmstat collected during this time period to
tell you more about why the particular balance was used.

[...]

> With kernel 4.7./4.8 it was really reaproduceable at every dnf update. With
> 4.9rc8 it has been much much better. So something must have changed, too.

that is good to hear but I it would be much better to collect reclaim
related data so that we can analyse what is actually going on here.

> As far as I understood it the order is 2^order kB pagesize. I don't think it
> makes a difference when swap is not used which order the memory allocation
> request is.
> 
> BTW: What were the commit that introduced the regression anf fixed it in
> 4.9?

I cannot really answer this without actually understanding what is going
on here and for that I do not have the relevant data.
-- 
Michal Hocko
SUSE Labs

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Re: Still OOM problems with 4.9er kernels

[Minchan Kim]

On Fri, Dec 09, 2016 at 04:52:07PM +0100, Gerhard Wiesinger wrote:
> On 09.12.2016 14:40, Michal Hocko wrote:
> >On Fri 09-12-16 08:06:25, Gerhard Wiesinger wrote:
> >>Hello,
> >>
> >>same with latest kernel rc, dnf still killed with OOM (but sometimes
> >>better).
> >>
> >>./update.sh: line 40:  1591 Killed                  ${EXE} update ${PARAMS}
> >>(does dnf clean all;dnf update)
> >>Linux database.intern 4.9.0-0.rc8.git2.1.fc26.x86_64 #1 SMP Wed Dec 7
> >>17:53:29 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
> >>
> >>Updated bug report:
> >>https://bugzilla.redhat.com/show_bug.cgi?id=1314697
> >Could you post your oom report please?
> 
> E.g. a new one with more than one included, first one after boot ...
> 
> Just setup a low mem VM under KVM and it is easily triggerable.
> 
> Still enough virtual memory available ...
> 
> 4.9.0-0.rc8.git2.1.fc26.x86_64
> 
> [  624.862777] ksoftirqd/0: page allocation failure: order:0,
> mode:0x2080020(GFP_ATOMIC)
> [  624.863319] CPU: 0 PID: 3 Comm: ksoftirqd/0 Not tainted
> 4.9.0-0.rc8.git2.1.fc26.x86_64 #1
> [  624.863410] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> 1.9.3
> [  624.863510]  ffffaa62c007f958 ffffffff904774e3 ffffffff90c7dd98
> 0000000000000000
> [  624.863923]  ffffaa62c007f9e0 ffffffff9020e6ea 0208002000000246
> ffffffff90c7dd98
> [  624.864019]  ffffaa62c007f980 ffff96b900000010 ffffaa62c007f9f0
> ffffaa62c007f9a0
> [  624.864998] Call Trace:
> [  624.865149]  [<ffffffff904774e3>] dump_stack+0x86/0xc3
> [  624.865347]  [<ffffffff9020e6ea>] warn_alloc+0x13a/0x170
> [  624.865432]  [<ffffffff9020e9e2>] __alloc_pages_slowpath+0x252/0xbb0
> [  624.865563]  [<ffffffff9020f74d>] __alloc_pages_nodemask+0x40d/0x4b0
> [  624.865675]  [<ffffffff9020f983>] __alloc_page_frag+0x193/0x200
> [  624.866024]  [<ffffffff907a1d7e>] __napi_alloc_skb+0x8e/0xf0
> [  624.866113]  [<ffffffffc017777d>] page_to_skb.isra.28+0x5d/0x310
> [virtio_net]
> [  624.866201]  [<ffffffffc01794cb>] virtnet_receive+0x2db/0x9a0
> [virtio_net]
> [  624.867378]  [<ffffffffc0179bad>] virtnet_poll+0x1d/0x80 [virtio_net]
> [  624.867494]  [<ffffffff907b501e>] net_rx_action+0x23e/0x470
> [  624.867612]  [<ffffffff9091a8cd>] __do_softirq+0xcd/0x4b9
> [  624.867704]  [<ffffffff900dd164>] ? smpboot_thread_fn+0x34/0x1f0
> [  624.867833]  [<ffffffff900dd25d>] ? smpboot_thread_fn+0x12d/0x1f0
> [  624.867924]  [<ffffffff900b7c95>] run_ksoftirqd+0x25/0x80
> [  624.868109]  [<ffffffff900dd258>] smpboot_thread_fn+0x128/0x1f0
> [  624.868197]  [<ffffffff900dd130>] ? sort_range+0x30/0x30
> [  624.868596]  [<ffffffff900d82c2>] kthread+0x102/0x120
> [  624.868679]  [<ffffffff909117a0>] ? wait_for_completion+0x110/0x140
> [  624.868768]  [<ffffffff900d81c0>] ? kthread_park+0x60/0x60
> [  624.868850]  [<ffffffff90917afa>] ret_from_fork+0x2a/0x40
> [  843.528656] httpd (2490) used greatest stack depth: 10304 bytes left
> [  878.077750] httpd (2976) used greatest stack depth: 10096 bytes left
> [93918.861109] netstat (14579) used greatest stack depth: 9488 bytes left
> [94050.874669] kworker/dying (6253) used greatest stack depth: 9008 bytes
> left
> [95895.765570] kworker/1:1H: page allocation failure: order:0,
> mode:0x2280020(GFP_ATOMIC|__GFP_NOTRACK)
> [95895.765819] CPU: 1 PID: 440 Comm: kworker/1:1H Not tainted
> 4.9.0-0.rc8.git2.1.fc26.x86_64 #1
> [95895.765911] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> 1.9.3
> [95895.766060] Workqueue: kblockd blk_mq_run_work_fn
> [95895.766143]  ffffaa62c0257628 ffffffff904774e3 ffffffff90c7dd98
> 0000000000000000
> [95895.766235]  ffffaa62c02576b0 ffffffff9020e6ea 0228002000000046
> ffffffff90c7dd98
> [95895.766325]  ffffaa62c0257650 ffff96b900000010 ffffaa62c02576c0
> ffffaa62c0257670
> [95895.766417] Call Trace:
> [95895.766502]  [<ffffffff904774e3>] dump_stack+0x86/0xc3
> [95895.766596]  [<ffffffff9020e6ea>] warn_alloc+0x13a/0x170
> [95895.766681]  [<ffffffff9020e9e2>] __alloc_pages_slowpath+0x252/0xbb0
> [95895.766767]  [<ffffffff9020f74d>] __alloc_pages_nodemask+0x40d/0x4b0
> [95895.766866]  [<ffffffff9026db51>] alloc_pages_current+0xa1/0x1f0
> [95895.766971]  [<ffffffff90916f17>] ? _raw_spin_unlock+0x27/0x40
> [95895.767073]  [<ffffffff90278956>] new_slab+0x316/0x7c0
> [95895.767160]  [<ffffffff9027ae8b>] ___slab_alloc+0x3fb/0x5c0
> [95895.772611]  [<ffffffff9010b042>] ? cpuacct_charge+0xf2/0x1f0
> [95895.773406]  [<ffffffffc005850d>] ? alloc_indirect.isra.11+0x1d/0x50
> [virtio_ring]
> [95895.774327]  [<ffffffff901319d5>] ? rcu_read_lock_sched_held+0x45/0x80
> [95895.775212]  [<ffffffffc005850d>] ? alloc_indirect.isra.11+0x1d/0x50
> [virtio_ring]
> [95895.776155]  [<ffffffff9027b0a1>] __slab_alloc+0x51/0x90
> [95895.777090]  [<ffffffff9027d141>] __kmalloc+0x251/0x320
> [95895.781502]  [<ffffffffc005850d>] ? alloc_indirect.isra.11+0x1d/0x50
> [virtio_ring]
> [95895.782309]  [<ffffffffc005850d>] alloc_indirect.isra.11+0x1d/0x50
> [virtio_ring]
> [95895.783334]  [<ffffffffc0059193>] virtqueue_add_sgs+0x1c3/0x4a0
> [virtio_ring]
> [95895.784059]  [<ffffffff90068475>] ? kvm_sched_clock_read+0x25/0x40
> [95895.784742]  [<ffffffffc006665c>] __virtblk_add_req+0xbc/0x220
> [virtio_blk]
> [95895.785419]  [<ffffffff901312fd>] ? debug_lockdep_rcu_enabled+0x1d/0x20
> [95895.786086]  [<ffffffffc0066935>] ? virtio_queue_rq+0x105/0x290
> [virtio_blk]
> [95895.786750]  [<ffffffffc006695d>] virtio_queue_rq+0x12d/0x290
> [virtio_blk]
> [95895.787427]  [<ffffffff9045015d>] __blk_mq_run_hw_queue+0x26d/0x3b0
> [95895.788106]  [<ffffffff904502e2>] blk_mq_run_work_fn+0x12/0x20
> [95895.789065]  [<ffffffff900d097e>] process_one_work+0x23e/0x6f0
> [95895.789741]  [<ffffffff900d08fa>] ? process_one_work+0x1ba/0x6f0
> [95895.790444]  [<ffffffff900d0e7e>] worker_thread+0x4e/0x490
> [95895.791178]  [<ffffffff900d0e30>] ? process_one_work+0x6f0/0x6f0
> [95895.791911]  [<ffffffff900d0e30>] ? process_one_work+0x6f0/0x6f0
> [95895.792653]  [<ffffffff90003eec>] ? do_syscall_64+0x6c/0x1f0
> [95895.793397]  [<ffffffff900d82c2>] kthread+0x102/0x120
> [95895.794212]  [<ffffffff90111775>] ? trace_hardirqs_on_caller+0xf5/0x1b0
> [95895.794942]  [<ffffffff900d81c0>] ? kthread_park+0x60/0x60
> [95895.795689]  [<ffffffff90917afa>] ret_from_fork+0x2a/0x40
> [95895.796408] Mem-Info:
> [95895.797110] active_anon:8800 inactive_anon:9030 isolated_anon:32
>                 active_file:263 inactive_file:238 isolated_file:0
>                 unevictable:0 dirty:0 writeback:330 unstable:0
>                 slab_reclaimable:5241 slab_unreclaimable:9538
>                 mapped:470 shmem:9 pagetables:2200 bounce:0
>                 free:690 free_pcp:68 free_cma:0
> [95895.801218] Node 0 active_anon:35200kB inactive_anon:36120kB
> active_file:1052kB inactive_file:952kB unevictable:0kB isolated(anon):128kB
> isolated(file):0kB mapped:1880kB dirty:0kB writeback:1320kB shmem:0kB
> shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 36kB writeback_tmp:0kB
> unstable:0kB pages_scanned:179 all_unreclaimable? no
> [95895.803264] Node 0 DMA free:924kB min:172kB low:212kB high:252kB
> active_anon:3544kB inactive_anon:3944kB active_file:84kB inactive_file:140kB
> unevictable:0kB writepending:4kB present:15992kB managed:15908kB mlocked:0kB
> slab_reclaimable:1728kB slab_unreclaimable:2964kB kernel_stack:84kB
> pagetables:1396kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
> [95895.805936] lowmem_reserve[]: 0 117 117 117 117
> [95895.806751] Node 0 DMA32 free:1836kB min:1296kB low:1620kB high:1944kB
> active_anon:31636kB inactive_anon:32164kB active_file:968kB
> inactive_file:804kB unevictable:0kB writepending:1288kB present:180080kB
> managed:139012kB mlocked:0kB slab_reclaimable:19236kB
> slab_unreclaimable:35188kB kernel_stack:1852kB pagetables:7404kB bounce:0kB
> free_pcp:272kB local_pcp:156kB free_cma:0kB
> [95895.809223] lowmem_reserve[]: 0 0 0 0 0
> [95895.810071] Node 0 DMA: 36*4kB (H) 29*8kB (H) 22*16kB (H) 6*32kB (H)
> 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 920kB
> [95895.812089] Node 0 DMA32: 77*4kB (H) 71*8kB (H) 28*16kB (H) 8*32kB (H)
> 4*64kB (H) 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 1836kB
> [95895.813979] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0
> hugepages_size=2048kB
> [95895.813981] 1804 total pagecache pages
> [95895.814931] 1289 pages in swap cache
> [95895.815849] Swap cache stats: add 5288014, delete 5286725, find
> 11568655/13881082
> [95895.816792] Free swap  = 1791816kB
> [95895.817706] Total swap = 2064380kB
> [95895.819222] 49018 pages RAM
> [95895.820145] 0 pages HighMem/MovableOnly
> [95895.821039] 10288 pages reserved
> [95895.823325] 0 pages cma reserved
> [95895.824244] 0 pages hwpoisoned
> [95895.825237] SLUB: Unable to allocate memory on node -1,
> gfp=0x2080020(GFP_ATOMIC)
> [95895.826140]   cache: kmalloc-256, object size: 256, buffer size: 256,
> default order: 0, min order: 0
> [95895.827034]   node 0: slabs: 113, objs: 1808, free: 0
> [97883.838418] httpd invoked oom-killer:
> gfp_mask=0x24201ca(GFP_HIGHUSER_MOVABLE|__GFP_COLD), nodemask=0, order=0,
> oom_score_adj=0
> [97883.843507] httpd cpuset=/ mems_allowed=0
> [97883.843601] CPU: 1 PID: 19043 Comm: httpd Not tainted
> 4.9.0-0.rc8.git2.1.fc26.x86_64 #1
> [97883.844628] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> 1.9.3
> [97883.845839]  ffffaa62c395f958 ffffffff904774e3 ffffaa62c395fb20
> ffff96b98b8b3100
> [97883.846970]  ffffaa62c395f9e0 ffffffff902a8c41 0000000000000000
> 0000000000000000
> [97883.848388]  ffffffff90ec6840 ffffaa62c395f990 ffffffff9011183d
> ffffaa62c395f9b0
> [97883.849945] Call Trace:
> [97883.851366]  [<ffffffff904774e3>] dump_stack+0x86/0xc3
> [97883.852535]  [<ffffffff902a8c41>] dump_header+0x7b/0x24f
> [97883.853718]  [<ffffffff9011183d>] ? trace_hardirqs_on+0xd/0x10
> [97883.854857]  [<ffffffff902085d3>] oom_kill_process+0x203/0x3e0
> [97883.856192]  [<ffffffff90208afb>] out_of_memory+0x13b/0x580
> [97883.857334]  [<ffffffff90208bea>] ? out_of_memory+0x22a/0x580
> [97883.858590]  [<ffffffff9020f31a>] __alloc_pages_slowpath+0xb8a/0xbb0
> [97883.859706]  [<ffffffff9020f74d>] __alloc_pages_nodemask+0x40d/0x4b0
> [97883.860854]  [<ffffffff90037de9>] ? sched_clock+0x9/0x10
> [97883.862120]  [<ffffffff9026db51>] alloc_pages_current+0xa1/0x1f0
> [97883.863251]  [<ffffffff90201d96>] __page_cache_alloc+0x146/0x190
> [97883.864449]  [<ffffffff9020366c>] ? pagecache_get_page+0x2c/0x300
> [97883.865602]  [<ffffffff90206055>] filemap_fault+0x345/0x790
> [97883.866661]  [<ffffffff90206238>] ? filemap_fault+0x528/0x790
> [97883.867795]  [<ffffffff903639d9>] ext4_filemap_fault+0x39/0x50
> [97883.869289]  [<ffffffff90241ca3>] __do_fault+0x83/0x1d0
> [97883.870301]  [<ffffffff90246642>] handle_mm_fault+0x11e2/0x17a0
> [97883.871304]  [<ffffffff902454ba>] ? handle_mm_fault+0x5a/0x17a0
> [97883.872491]  [<ffffffff9006de16>] __do_page_fault+0x266/0x520
> [97883.873406]  [<ffffffff9006e1a8>] trace_do_page_fault+0x58/0x2a0
> [97883.874262]  [<ffffffff90067f3a>] do_async_page_fault+0x1a/0xa0
> [97883.875168]  [<ffffffff90918e28>] async_page_fault+0x28/0x30
> [97883.882611] Mem-Info:
> [97883.883747] active_anon:2915 inactive_anon:3376 isolated_anon:0
>                 active_file:3902 inactive_file:3639 isolated_file:0
>                 unevictable:0 dirty:205 writeback:0 unstable:0
>                 slab_reclaimable:9856 slab_unreclaimable:9682
>                 mapped:3722 shmem:59 pagetables:2080 bounce:0
>                 free:748 free_pcp:15 free_cma:0
> [97883.890766] Node 0 active_anon:11660kB inactive_anon:13504kB
> active_file:15608kB inactive_file:14556kB unevictable:0kB isolated(anon):0kB
> isolated(file):0kB mapped:14888kB dirty:820kB writeback:0kB shmem:0kB
> shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 236kB writeback_tmp:0kB
> unstable:0kB pages_scanned:168352 all_unreclaimable? yes
> [97883.893210] Node 0 DMA free:1468kB min:172kB low:212kB high:252kB
> active_anon:1716kB inactive_anon:912kB active_file:2292kB
> inactive_file:876kB unevictable:0kB writepending:24kB present:15992kB
> managed:15908kB mlocked:0kB slab_reclaimable:4652kB
> slab_unreclaimable:2852kB kernel_stack:76kB pagetables:496kB bounce:0kB
> free_pcp:0kB local_pcp:0kB free_cma:0kB
> [97883.898799] lowmem_reserve[]: 0 117 117 117 117
> [97883.899735] Node 0 DMA32 free:1524kB min:1296kB low:1620kB high:1944kB
> active_anon:9944kB inactive_anon:12572kB active_file:13316kB
> inactive_file:13680kB unevictable:0kB writepending:768kB present:180080kB
> managed:139012kB mlocked:0kB slab_reclaimable:34772kB
> slab_unreclaimable:35876kB kernel_stack:1828kB pagetables:7824kB bounce:0kB
> free_pcp:60kB local_pcp:52kB free_cma:0kB
> [97883.903033] lowmem_reserve[]: 0 0 0 0 0
> [97883.904371] Node 0 DMA: 36*4kB (H) 29*8kB (H) 22*16kB (H) 9*32kB (H)
> 3*64kB (H) 2*128kB (H) 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 1464kB
> [97883.906442] Node 0 DMA32: 13*4kB (H) 4*8kB (H) 13*16kB (H) 8*32kB (H)
> 9*64kB (H) 1*128kB (H) 1*256kB (H) 0*512kB 0*1024kB 0*2048kB 0*4096kB =
> 1508kB

(H) mean highorder atomic reserved which was introduced since v4.4 and some
patches to use up that reserved memory went to linux-next recently via mmotm
tree.
It doesn't land to 4.9 so it might help to test recent linux-next tree.
It should include [1].

[1] 04c8716f7b00, mm: try to exhaust highatomic reserve before the OOM

Thanks.

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Re: Still OOM problems with 4.9er kernels

[Gerhard Wiesinger]

On 23.12.2016 03:55, Minchan Kim wrote:
> On Fri, Dec 09, 2016 at 04:52:07PM +0100, Gerhard Wiesinger wrote:
>> On 09.12.2016 14:40, Michal Hocko wrote:
>>> On Fri 09-12-16 08:06:25, Gerhard Wiesinger wrote:
>>>> Hello,
>>>>
>>>> same with latest kernel rc, dnf still killed with OOM (but sometimes
>>>> better).
>>>>
>>>> ./update.sh: line 40:  1591 Killed                  ${EXE} update ${PARAMS}
>>>> (does dnf clean all;dnf update)
>>>> Linux database.intern 4.9.0-0.rc8.git2.1.fc26.x86_64 #1 SMP Wed Dec 7
>>>> 17:53:29 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
>>>>
>>>> Updated bug report:
>>>> https://bugzilla.redhat.com/show_bug.cgi?id=1314697
>>> Could you post your oom report please?
>> E.g. a new one with more than one included, first one after boot ...
>>
>> Just setup a low mem VM under KVM and it is easily triggerable.
>>
>> Still enough virtual memory available ...
>>
>> 4.9.0-0.rc8.git2.1.fc26.x86_64
>>
>> [  624.862777] ksoftirqd/0: page allocation failure: order:0,
>> mode:0x2080020(GFP_ATOMIC)
>> [  624.863319] CPU: 0 PID: 3 Comm: ksoftirqd/0 Not tainted
>> 4.9.0-0.rc8.git2.1.fc26.x86_64 #1
>> [  624.863410] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
>> 1.9.3
>> [  624.863510]  ffffaa62c007f958 ffffffff904774e3 ffffffff90c7dd98
>> 0000000000000000
>> [  624.863923]  ffffaa62c007f9e0 ffffffff9020e6ea 0208002000000246
>> ffffffff90c7dd98
>> [  624.864019]  ffffaa62c007f980 ffff96b900000010 ffffaa62c007f9f0
>> ffffaa62c007f9a0
>> [  624.864998] Call Trace:
>> [  624.865149]  [<ffffffff904774e3>] dump_stack+0x86/0xc3
>> [  624.865347]  [<ffffffff9020e6ea>] warn_alloc+0x13a/0x170
>> [  624.865432]  [<ffffffff9020e9e2>] __alloc_pages_slowpath+0x252/0xbb0
>> [  624.865563]  [<ffffffff9020f74d>] __alloc_pages_nodemask+0x40d/0x4b0
>> [  624.865675]  [<ffffffff9020f983>] __alloc_page_frag+0x193/0x200
>> [  624.866024]  [<ffffffff907a1d7e>] __napi_alloc_skb+0x8e/0xf0
>> [  624.866113]  [<ffffffffc017777d>] page_to_skb.isra.28+0x5d/0x310
>> [virtio_net]
>> [  624.866201]  [<ffffffffc01794cb>] virtnet_receive+0x2db/0x9a0
>> [virtio_net]
>> [  624.867378]  [<ffffffffc0179bad>] virtnet_poll+0x1d/0x80 [virtio_net]
>> [  624.867494]  [<ffffffff907b501e>] net_rx_action+0x23e/0x470
>> [  624.867612]  [<ffffffff9091a8cd>] __do_softirq+0xcd/0x4b9
>> [  624.867704]  [<ffffffff900dd164>] ? smpboot_thread_fn+0x34/0x1f0
>> [  624.867833]  [<ffffffff900dd25d>] ? smpboot_thread_fn+0x12d/0x1f0
>> [  624.867924]  [<ffffffff900b7c95>] run_ksoftirqd+0x25/0x80
>> [  624.868109]  [<ffffffff900dd258>] smpboot_thread_fn+0x128/0x1f0
>> [  624.868197]  [<ffffffff900dd130>] ? sort_range+0x30/0x30
>> [  624.868596]  [<ffffffff900d82c2>] kthread+0x102/0x120
>> [  624.868679]  [<ffffffff909117a0>] ? wait_for_completion+0x110/0x140
>> [  624.868768]  [<ffffffff900d81c0>] ? kthread_park+0x60/0x60
>> [  624.868850]  [<ffffffff90917afa>] ret_from_fork+0x2a/0x40
>> [  843.528656] httpd (2490) used greatest stack depth: 10304 bytes left
>> [  878.077750] httpd (2976) used greatest stack depth: 10096 bytes left
>> [93918.861109] netstat (14579) used greatest stack depth: 9488 bytes left
>> [94050.874669] kworker/dying (6253) used greatest stack depth: 9008 bytes
>> left
>> [95895.765570] kworker/1:1H: page allocation failure: order:0,
>> mode:0x2280020(GFP_ATOMIC|__GFP_NOTRACK)
>> [95895.765819] CPU: 1 PID: 440 Comm: kworker/1:1H Not tainted
>> 4.9.0-0.rc8.git2.1.fc26.x86_64 #1
>> [95895.765911] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
>> 1.9.3
>> [95895.766060] Workqueue: kblockd blk_mq_run_work_fn
>> [95895.766143]  ffffaa62c0257628 ffffffff904774e3 ffffffff90c7dd98
>> 0000000000000000
>> [95895.766235]  ffffaa62c02576b0 ffffffff9020e6ea 0228002000000046
>> ffffffff90c7dd98
>> [95895.766325]  ffffaa62c0257650 ffff96b900000010 ffffaa62c02576c0
>> ffffaa62c0257670
>> [95895.766417] Call Trace:
>> [95895.766502]  [<ffffffff904774e3>] dump_stack+0x86/0xc3
>> [95895.766596]  [<ffffffff9020e6ea>] warn_alloc+0x13a/0x170
>> [95895.766681]  [<ffffffff9020e9e2>] __alloc_pages_slowpath+0x252/0xbb0
>> [95895.766767]  [<ffffffff9020f74d>] __alloc_pages_nodemask+0x40d/0x4b0
>> [95895.766866]  [<ffffffff9026db51>] alloc_pages_current+0xa1/0x1f0
>> [95895.766971]  [<ffffffff90916f17>] ? _raw_spin_unlock+0x27/0x40
>> [95895.767073]  [<ffffffff90278956>] new_slab+0x316/0x7c0
>> [95895.767160]  [<ffffffff9027ae8b>] ___slab_alloc+0x3fb/0x5c0
>> [95895.772611]  [<ffffffff9010b042>] ? cpuacct_charge+0xf2/0x1f0
>> [95895.773406]  [<ffffffffc005850d>] ? alloc_indirect.isra.11+0x1d/0x50
>> [virtio_ring]
>> [95895.774327]  [<ffffffff901319d5>] ? rcu_read_lock_sched_held+0x45/0x80
>> [95895.775212]  [<ffffffffc005850d>] ? alloc_indirect.isra.11+0x1d/0x50
>> [virtio_ring]
>> [95895.776155]  [<ffffffff9027b0a1>] __slab_alloc+0x51/0x90
>> [95895.777090]  [<ffffffff9027d141>] __kmalloc+0x251/0x320
>> [95895.781502]  [<ffffffffc005850d>] ? alloc_indirect.isra.11+0x1d/0x50
>> [virtio_ring]
>> [95895.782309]  [<ffffffffc005850d>] alloc_indirect.isra.11+0x1d/0x50
>> [virtio_ring]
>> [95895.783334]  [<ffffffffc0059193>] virtqueue_add_sgs+0x1c3/0x4a0
>> [virtio_ring]
>> [95895.784059]  [<ffffffff90068475>] ? kvm_sched_clock_read+0x25/0x40
>> [95895.784742]  [<ffffffffc006665c>] __virtblk_add_req+0xbc/0x220
>> [virtio_blk]
>> [95895.785419]  [<ffffffff901312fd>] ? debug_lockdep_rcu_enabled+0x1d/0x20
>> [95895.786086]  [<ffffffffc0066935>] ? virtio_queue_rq+0x105/0x290
>> [virtio_blk]
>> [95895.786750]  [<ffffffffc006695d>] virtio_queue_rq+0x12d/0x290
>> [virtio_blk]
>> [95895.787427]  [<ffffffff9045015d>] __blk_mq_run_hw_queue+0x26d/0x3b0
>> [95895.788106]  [<ffffffff904502e2>] blk_mq_run_work_fn+0x12/0x20
>> [95895.789065]  [<ffffffff900d097e>] process_one_work+0x23e/0x6f0
>> [95895.789741]  [<ffffffff900d08fa>] ? process_one_work+0x1ba/0x6f0
>> [95895.790444]  [<ffffffff900d0e7e>] worker_thread+0x4e/0x490
>> [95895.791178]  [<ffffffff900d0e30>] ? process_one_work+0x6f0/0x6f0
>> [95895.791911]  [<ffffffff900d0e30>] ? process_one_work+0x6f0/0x6f0
>> [95895.792653]  [<ffffffff90003eec>] ? do_syscall_64+0x6c/0x1f0
>> [95895.793397]  [<ffffffff900d82c2>] kthread+0x102/0x120
>> [95895.794212]  [<ffffffff90111775>] ? trace_hardirqs_on_caller+0xf5/0x1b0
>> [95895.794942]  [<ffffffff900d81c0>] ? kthread_park+0x60/0x60
>> [95895.795689]  [<ffffffff90917afa>] ret_from_fork+0x2a/0x40
>> [95895.796408] Mem-Info:
>> [95895.797110] active_anon:8800 inactive_anon:9030 isolated_anon:32
>>                  active_file:263 inactive_file:238 isolated_file:0
>>                  unevictable:0 dirty:0 writeback:330 unstable:0
>>                  slab_reclaimable:5241 slab_unreclaimable:9538
>>                  mapped:470 shmem:9 pagetables:2200 bounce:0
>>                  free:690 free_pcp:68 free_cma:0
>> [95895.801218] Node 0 active_anon:35200kB inactive_anon:36120kB
>> active_file:1052kB inactive_file:952kB unevictable:0kB isolated(anon):128kB
>> isolated(file):0kB mapped:1880kB dirty:0kB writeback:1320kB shmem:0kB
>> shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 36kB writeback_tmp:0kB
>> unstable:0kB pages_scanned:179 all_unreclaimable? no
>> [95895.803264] Node 0 DMA free:924kB min:172kB low:212kB high:252kB
>> active_anon:3544kB inactive_anon:3944kB active_file:84kB inactive_file:140kB
>> unevictable:0kB writepending:4kB present:15992kB managed:15908kB mlocked:0kB
>> slab_reclaimable:1728kB slab_unreclaimable:2964kB kernel_stack:84kB
>> pagetables:1396kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
>> [95895.805936] lowmem_reserve[]: 0 117 117 117 117
>> [95895.806751] Node 0 DMA32 free:1836kB min:1296kB low:1620kB high:1944kB
>> active_anon:31636kB inactive_anon:32164kB active_file:968kB
>> inactive_file:804kB unevictable:0kB writepending:1288kB present:180080kB
>> managed:139012kB mlocked:0kB slab_reclaimable:19236kB
>> slab_unreclaimable:35188kB kernel_stack:1852kB pagetables:7404kB bounce:0kB
>> free_pcp:272kB local_pcp:156kB free_cma:0kB
>> [95895.809223] lowmem_reserve[]: 0 0 0 0 0
>> [95895.810071] Node 0 DMA: 36*4kB (H) 29*8kB (H) 22*16kB (H) 6*32kB (H)
>> 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 920kB
>> [95895.812089] Node 0 DMA32: 77*4kB (H) 71*8kB (H) 28*16kB (H) 8*32kB (H)
>> 4*64kB (H) 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 1836kB
>> [95895.813979] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0
>> hugepages_size=2048kB
>> [95895.813981] 1804 total pagecache pages
>> [95895.814931] 1289 pages in swap cache
>> [95895.815849] Swap cache stats: add 5288014, delete 5286725, find
>> 11568655/13881082
>> [95895.816792] Free swap  = 1791816kB
>> [95895.817706] Total swap = 2064380kB
>> [95895.819222] 49018 pages RAM
>> [95895.820145] 0 pages HighMem/MovableOnly
>> [95895.821039] 10288 pages reserved
>> [95895.823325] 0 pages cma reserved
>> [95895.824244] 0 pages hwpoisoned
>> [95895.825237] SLUB: Unable to allocate memory on node -1,
>> gfp=0x2080020(GFP_ATOMIC)
>> [95895.826140]   cache: kmalloc-256, object size: 256, buffer size: 256,
>> default order: 0, min order: 0
>> [95895.827034]   node 0: slabs: 113, objs: 1808, free: 0
>> [97883.838418] httpd invoked oom-killer:
>> gfp_mask=0x24201ca(GFP_HIGHUSER_MOVABLE|__GFP_COLD), nodemask=0, order=0,
>> oom_score_adj=0
>> [97883.843507] httpd cpuset=/ mems_allowed=0
>> [97883.843601] CPU: 1 PID: 19043 Comm: httpd Not tainted
>> 4.9.0-0.rc8.git2.1.fc26.x86_64 #1
>> [97883.844628] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
>> 1.9.3
>> [97883.845839]  ffffaa62c395f958 ffffffff904774e3 ffffaa62c395fb20
>> ffff96b98b8b3100
>> [97883.846970]  ffffaa62c395f9e0 ffffffff902a8c41 0000000000000000
>> 0000000000000000
>> [97883.848388]  ffffffff90ec6840 ffffaa62c395f990 ffffffff9011183d
>> ffffaa62c395f9b0
>> [97883.849945] Call Trace:
>> [97883.851366]  [<ffffffff904774e3>] dump_stack+0x86/0xc3
>> [97883.852535]  [<ffffffff902a8c41>] dump_header+0x7b/0x24f
>> [97883.853718]  [<ffffffff9011183d>] ? trace_hardirqs_on+0xd/0x10
>> [97883.854857]  [<ffffffff902085d3>] oom_kill_process+0x203/0x3e0
>> [97883.856192]  [<ffffffff90208afb>] out_of_memory+0x13b/0x580
>> [97883.857334]  [<ffffffff90208bea>] ? out_of_memory+0x22a/0x580
>> [97883.858590]  [<ffffffff9020f31a>] __alloc_pages_slowpath+0xb8a/0xbb0
>> [97883.859706]  [<ffffffff9020f74d>] __alloc_pages_nodemask+0x40d/0x4b0
>> [97883.860854]  [<ffffffff90037de9>] ? sched_clock+0x9/0x10
>> [97883.862120]  [<ffffffff9026db51>] alloc_pages_current+0xa1/0x1f0
>> [97883.863251]  [<ffffffff90201d96>] __page_cache_alloc+0x146/0x190
>> [97883.864449]  [<ffffffff9020366c>] ? pagecache_get_page+0x2c/0x300
>> [97883.865602]  [<ffffffff90206055>] filemap_fault+0x345/0x790
>> [97883.866661]  [<ffffffff90206238>] ? filemap_fault+0x528/0x790
>> [97883.867795]  [<ffffffff903639d9>] ext4_filemap_fault+0x39/0x50
>> [97883.869289]  [<ffffffff90241ca3>] __do_fault+0x83/0x1d0
>> [97883.870301]  [<ffffffff90246642>] handle_mm_fault+0x11e2/0x17a0
>> [97883.871304]  [<ffffffff902454ba>] ? handle_mm_fault+0x5a/0x17a0
>> [97883.872491]  [<ffffffff9006de16>] __do_page_fault+0x266/0x520
>> [97883.873406]  [<ffffffff9006e1a8>] trace_do_page_fault+0x58/0x2a0
>> [97883.874262]  [<ffffffff90067f3a>] do_async_page_fault+0x1a/0xa0
>> [97883.875168]  [<ffffffff90918e28>] async_page_fault+0x28/0x30
>> [97883.882611] Mem-Info:
>> [97883.883747] active_anon:2915 inactive_anon:3376 isolated_anon:0
>>                  active_file:3902 inactive_file:3639 isolated_file:0
>>                  unevictable:0 dirty:205 writeback:0 unstable:0
>>                  slab_reclaimable:9856 slab_unreclaimable:9682
>>                  mapped:3722 shmem:59 pagetables:2080 bounce:0
>>                  free:748 free_pcp:15 free_cma:0
>> [97883.890766] Node 0 active_anon:11660kB inactive_anon:13504kB
>> active_file:15608kB inactive_file:14556kB unevictable:0kB isolated(anon):0kB
>> isolated(file):0kB mapped:14888kB dirty:820kB writeback:0kB shmem:0kB
>> shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 236kB writeback_tmp:0kB
>> unstable:0kB pages_scanned:168352 all_unreclaimable? yes
>> [97883.893210] Node 0 DMA free:1468kB min:172kB low:212kB high:252kB
>> active_anon:1716kB inactive_anon:912kB active_file:2292kB
>> inactive_file:876kB unevictable:0kB writepending:24kB present:15992kB
>> managed:15908kB mlocked:0kB slab_reclaimable:4652kB
>> slab_unreclaimable:2852kB kernel_stack:76kB pagetables:496kB bounce:0kB
>> free_pcp:0kB local_pcp:0kB free_cma:0kB
>> [97883.898799] lowmem_reserve[]: 0 117 117 117 117
>> [97883.899735] Node 0 DMA32 free:1524kB min:1296kB low:1620kB high:1944kB
>> active_anon:9944kB inactive_anon:12572kB active_file:13316kB
>> inactive_file:13680kB unevictable:0kB writepending:768kB present:180080kB
>> managed:139012kB mlocked:0kB slab_reclaimable:34772kB
>> slab_unreclaimable:35876kB kernel_stack:1828kB pagetables:7824kB bounce:0kB
>> free_pcp:60kB local_pcp:52kB free_cma:0kB
>> [97883.903033] lowmem_reserve[]: 0 0 0 0 0
>> [97883.904371] Node 0 DMA: 36*4kB (H) 29*8kB (H) 22*16kB (H) 9*32kB (H)
>> 3*64kB (H) 2*128kB (H) 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 1464kB
>> [97883.906442] Node 0 DMA32: 13*4kB (H) 4*8kB (H) 13*16kB (H) 8*32kB (H)
>> 9*64kB (H) 1*128kB (H) 1*256kB (H) 0*512kB 0*1024kB 0*2048kB 0*4096kB =
>> 1508kB
> (H) mean highorder atomic reserved which was introduced since v4.4 and some
> patches to use up that reserved memory went to linux-next recently via mmotm
> tree.
> It doesn't land to 4.9 so it might help to test recent linux-next tree.
> It should include [1].
>
> [1] 04c8716f7b00, mm: try to exhaust highatomic reserve before the OOM
>

Hello Minchan,

4.10.0-0.rc0.git9.1.fc26.x86_64
No still OOMs. I'll send you the infos per private mail.

Ciao,
Gerhard

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Re: Still OOM problems with 4.9er kernels

[Gerhard Wiesinger]

On 23.12.2016 03:55, Minchan Kim wrote:
> On Fri, Dec 09, 2016 at 04:52:07PM +0100, Gerhard Wiesinger wrote:
>> On 09.12.2016 14:40, Michal Hocko wrote:
>>> On Fri 09-12-16 08:06:25, Gerhard Wiesinger wrote:
>>>> Hello,
>>>>
>>>> same with latest kernel rc, dnf still killed with OOM (but sometimes
>>>> better).
>>>>
>>>> ./update.sh: line 40:  1591 Killed                  ${EXE} update ${PARAMS}
>>>> (does dnf clean all;dnf update)
>>>> Linux database.intern 4.9.0-0.rc8.git2.1.fc26.x86_64 #1 SMP Wed Dec 7
>>>> 17:53:29 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
>>>>
>>>> Updated bug report:
>>>> https://bugzilla.redhat.com/show_bug.cgi?id=1314697
>>> Could you post your oom report please?
>> E.g. a new one with more than one included, first one after boot ...
>>
>> Just setup a low mem VM under KVM and it is easily triggerable.
>>
>> Still enough virtual memory available ...
>>
>> 4.9.0-0.rc8.git2.1.fc26.x86_64
>>
>> [  624.862777] ksoftirqd/0: page allocation failure: order:0,
>> mode:0x2080020(GFP_ATOMIC)
>> [  624.863319] CPU: 0 PID: 3 Comm: ksoftirqd/0 Not tainted
>> 4.9.0-0.rc8.git2.1.fc26.x86_64 #1
>> [  624.863410] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
>> 1.9.3
>> [  624.863510]  ffffaa62c007f958 ffffffff904774e3 ffffffff90c7dd98
>> 0000000000000000
>> [  624.863923]  ffffaa62c007f9e0 ffffffff9020e6ea 0208002000000246
>> ffffffff90c7dd98
>> [  624.864019]  ffffaa62c007f980 ffff96b900000010 ffffaa62c007f9f0
>> ffffaa62c007f9a0
>> [  624.864998] Call Trace:
>> [  624.865149]  [<ffffffff904774e3>] dump_stack+0x86/0xc3
>> [  624.865347]  [<ffffffff9020e6ea>] warn_alloc+0x13a/0x170
>> [  624.865432]  [<ffffffff9020e9e2>] __alloc_pages_slowpath+0x252/0xbb0
>> [  624.865563]  [<ffffffff9020f74d>] __alloc_pages_nodemask+0x40d/0x4b0
>> [  624.865675]  [<ffffffff9020f983>] __alloc_page_frag+0x193/0x200
>> [  624.866024]  [<ffffffff907a1d7e>] __napi_alloc_skb+0x8e/0xf0
>> [  624.866113]  [<ffffffffc017777d>] page_to_skb.isra.28+0x5d/0x310
>> [virtio_net]
>> [  624.866201]  [<ffffffffc01794cb>] virtnet_receive+0x2db/0x9a0
>> [virtio_net]
>> [  624.867378]  [<ffffffffc0179bad>] virtnet_poll+0x1d/0x80 [virtio_net]
>> [  624.867494]  [<ffffffff907b501e>] net_rx_action+0x23e/0x470
>> [  624.867612]  [<ffffffff9091a8cd>] __do_softirq+0xcd/0x4b9
>> [  624.867704]  [<ffffffff900dd164>] ? smpboot_thread_fn+0x34/0x1f0
>> [  624.867833]  [<ffffffff900dd25d>] ? smpboot_thread_fn+0x12d/0x1f0
>> [  624.867924]  [<ffffffff900b7c95>] run_ksoftirqd+0x25/0x80
>> [  624.868109]  [<ffffffff900dd258>] smpboot_thread_fn+0x128/0x1f0
>> [  624.868197]  [<ffffffff900dd130>] ? sort_range+0x30/0x30
>> [  624.868596]  [<ffffffff900d82c2>] kthread+0x102/0x120
>> [  624.868679]  [<ffffffff909117a0>] ? wait_for_completion+0x110/0x140
>> [  624.868768]  [<ffffffff900d81c0>] ? kthread_park+0x60/0x60
>> [  624.868850]  [<ffffffff90917afa>] ret_from_fork+0x2a/0x40
>> [  843.528656] httpd (2490) used greatest stack depth: 10304 bytes left
>> [  878.077750] httpd (2976) used greatest stack depth: 10096 bytes left
>> [93918.861109] netstat (14579) used greatest stack depth: 9488 bytes left
>> [94050.874669] kworker/dying (6253) used greatest stack depth: 9008 bytes
>> left
>> [95895.765570] kworker/1:1H: page allocation failure: order:0,
>> mode:0x2280020(GFP_ATOMIC|__GFP_NOTRACK)
>> [95895.765819] CPU: 1 PID: 440 Comm: kworker/1:1H Not tainted
>> 4.9.0-0.rc8.git2.1.fc26.x86_64 #1
>> [95895.765911] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
>> 1.9.3
>> [95895.766060] Workqueue: kblockd blk_mq_run_work_fn
>> [95895.766143]  ffffaa62c0257628 ffffffff904774e3 ffffffff90c7dd98
>> 0000000000000000
>> [95895.766235]  ffffaa62c02576b0 ffffffff9020e6ea 0228002000000046
>> ffffffff90c7dd98
>> [95895.766325]  ffffaa62c0257650 ffff96b900000010 ffffaa62c02576c0
>> ffffaa62c0257670
>> [95895.766417] Call Trace:
>> [95895.766502]  [<ffffffff904774e3>] dump_stack+0x86/0xc3
>> [95895.766596]  [<ffffffff9020e6ea>] warn_alloc+0x13a/0x170
>> [95895.766681]  [<ffffffff9020e9e2>] __alloc_pages_slowpath+0x252/0xbb0
>> [95895.766767]  [<ffffffff9020f74d>] __alloc_pages_nodemask+0x40d/0x4b0
>> [95895.766866]  [<ffffffff9026db51>] alloc_pages_current+0xa1/0x1f0
>> [95895.766971]  [<ffffffff90916f17>] ? _raw_spin_unlock+0x27/0x40
>> [95895.767073]  [<ffffffff90278956>] new_slab+0x316/0x7c0
>> [95895.767160]  [<ffffffff9027ae8b>] ___slab_alloc+0x3fb/0x5c0
>> [95895.772611]  [<ffffffff9010b042>] ? cpuacct_charge+0xf2/0x1f0
>> [95895.773406]  [<ffffffffc005850d>] ? alloc_indirect.isra.11+0x1d/0x50
>> [virtio_ring]
>> [95895.774327]  [<ffffffff901319d5>] ? rcu_read_lock_sched_held+0x45/0x80
>> [95895.775212]  [<ffffffffc005850d>] ? alloc_indirect.isra.11+0x1d/0x50
>> [virtio_ring]
>> [95895.776155]  [<ffffffff9027b0a1>] __slab_alloc+0x51/0x90
>> [95895.777090]  [<ffffffff9027d141>] __kmalloc+0x251/0x320
>> [95895.781502]  [<ffffffffc005850d>] ? alloc_indirect.isra.11+0x1d/0x50
>> [virtio_ring]
>> [95895.782309]  [<ffffffffc005850d>] alloc_indirect.isra.11+0x1d/0x50
>> [virtio_ring]
>> [95895.783334]  [<ffffffffc0059193>] virtqueue_add_sgs+0x1c3/0x4a0
>> [virtio_ring]
>> [95895.784059]  [<ffffffff90068475>] ? kvm_sched_clock_read+0x25/0x40
>> [95895.784742]  [<ffffffffc006665c>] __virtblk_add_req+0xbc/0x220
>> [virtio_blk]
>> [95895.785419]  [<ffffffff901312fd>] ? debug_lockdep_rcu_enabled+0x1d/0x20
>> [95895.786086]  [<ffffffffc0066935>] ? virtio_queue_rq+0x105/0x290
>> [virtio_blk]
>> [95895.786750]  [<ffffffffc006695d>] virtio_queue_rq+0x12d/0x290
>> [virtio_blk]
>> [95895.787427]  [<ffffffff9045015d>] __blk_mq_run_hw_queue+0x26d/0x3b0
>> [95895.788106]  [<ffffffff904502e2>] blk_mq_run_work_fn+0x12/0x20
>> [95895.789065]  [<ffffffff900d097e>] process_one_work+0x23e/0x6f0
>> [95895.789741]  [<ffffffff900d08fa>] ? process_one_work+0x1ba/0x6f0
>> [95895.790444]  [<ffffffff900d0e7e>] worker_thread+0x4e/0x490
>> [95895.791178]  [<ffffffff900d0e30>] ? process_one_work+0x6f0/0x6f0
>> [95895.791911]  [<ffffffff900d0e30>] ? process_one_work+0x6f0/0x6f0
>> [95895.792653]  [<ffffffff90003eec>] ? do_syscall_64+0x6c/0x1f0
>> [95895.793397]  [<ffffffff900d82c2>] kthread+0x102/0x120
>> [95895.794212]  [<ffffffff90111775>] ? trace_hardirqs_on_caller+0xf5/0x1b0
>> [95895.794942]  [<ffffffff900d81c0>] ? kthread_park+0x60/0x60
>> [95895.795689]  [<ffffffff90917afa>] ret_from_fork+0x2a/0x40
>> [95895.796408] Mem-Info:
>> [95895.797110] active_anon:8800 inactive_anon:9030 isolated_anon:32
>>                  active_file:263 inactive_file:238 isolated_file:0
>>                  unevictable:0 dirty:0 writeback:330 unstable:0
>>                  slab_reclaimable:5241 slab_unreclaimable:9538
>>                  mapped:470 shmem:9 pagetables:2200 bounce:0
>>                  free:690 free_pcp:68 free_cma:0
>> [95895.801218] Node 0 active_anon:35200kB inactive_anon:36120kB
>> active_file:1052kB inactive_file:952kB unevictable:0kB isolated(anon):128kB
>> isolated(file):0kB mapped:1880kB dirty:0kB writeback:1320kB shmem:0kB
>> shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 36kB writeback_tmp:0kB
>> unstable:0kB pages_scanned:179 all_unreclaimable? no
>> [95895.803264] Node 0 DMA free:924kB min:172kB low:212kB high:252kB
>> active_anon:3544kB inactive_anon:3944kB active_file:84kB inactive_file:140kB
>> unevictable:0kB writepending:4kB present:15992kB managed:15908kB mlocked:0kB
>> slab_reclaimable:1728kB slab_unreclaimable:2964kB kernel_stack:84kB
>> pagetables:1396kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
>> [95895.805936] lowmem_reserve[]: 0 117 117 117 117
>> [95895.806751] Node 0 DMA32 free:1836kB min:1296kB low:1620kB high:1944kB
>> active_anon:31636kB inactive_anon:32164kB active_file:968kB
>> inactive_file:804kB unevictable:0kB writepending:1288kB present:180080kB
>> managed:139012kB mlocked:0kB slab_reclaimable:19236kB
>> slab_unreclaimable:35188kB kernel_stack:1852kB pagetables:7404kB bounce:0kB
>> free_pcp:272kB local_pcp:156kB free_cma:0kB
>> [95895.809223] lowmem_reserve[]: 0 0 0 0 0
>> [95895.810071] Node 0 DMA: 36*4kB (H) 29*8kB (H) 22*16kB (H) 6*32kB (H)
>> 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 920kB
>> [95895.812089] Node 0 DMA32: 77*4kB (H) 71*8kB (H) 28*16kB (H) 8*32kB (H)
>> 4*64kB (H) 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 1836kB
>> [95895.813979] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0
>> hugepages_size=2048kB
>> [95895.813981] 1804 total pagecache pages
>> [95895.814931] 1289 pages in swap cache
>> [95895.815849] Swap cache stats: add 5288014, delete 5286725, find
>> 11568655/13881082
>> [95895.816792] Free swap  = 1791816kB
>> [95895.817706] Total swap = 2064380kB
>> [95895.819222] 49018 pages RAM
>> [95895.820145] 0 pages HighMem/MovableOnly
>> [95895.821039] 10288 pages reserved
>> [95895.823325] 0 pages cma reserved
>> [95895.824244] 0 pages hwpoisoned
>> [95895.825237] SLUB: Unable to allocate memory on node -1,
>> gfp=0x2080020(GFP_ATOMIC)
>> [95895.826140]   cache: kmalloc-256, object size: 256, buffer size: 256,
>> default order: 0, min order: 0
>> [95895.827034]   node 0: slabs: 113, objs: 1808, free: 0
>> [97883.838418] httpd invoked oom-killer:
>> gfp_mask=0x24201ca(GFP_HIGHUSER_MOVABLE|__GFP_COLD), nodemask=0, order=0,
>> oom_score_adj=0
>> [97883.843507] httpd cpuset=/ mems_allowed=0
>> [97883.843601] CPU: 1 PID: 19043 Comm: httpd Not tainted
>> 4.9.0-0.rc8.git2.1.fc26.x86_64 #1
>> [97883.844628] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
>> 1.9.3
>> [97883.845839]  ffffaa62c395f958 ffffffff904774e3 ffffaa62c395fb20
>> ffff96b98b8b3100
>> [97883.846970]  ffffaa62c395f9e0 ffffffff902a8c41 0000000000000000
>> 0000000000000000
>> [97883.848388]  ffffffff90ec6840 ffffaa62c395f990 ffffffff9011183d
>> ffffaa62c395f9b0
>> [97883.849945] Call Trace:
>> [97883.851366]  [<ffffffff904774e3>] dump_stack+0x86/0xc3
>> [97883.852535]  [<ffffffff902a8c41>] dump_header+0x7b/0x24f
>> [97883.853718]  [<ffffffff9011183d>] ? trace_hardirqs_on+0xd/0x10
>> [97883.854857]  [<ffffffff902085d3>] oom_kill_process+0x203/0x3e0
>> [97883.856192]  [<ffffffff90208afb>] out_of_memory+0x13b/0x580
>> [97883.857334]  [<ffffffff90208bea>] ? out_of_memory+0x22a/0x580
>> [97883.858590]  [<ffffffff9020f31a>] __alloc_pages_slowpath+0xb8a/0xbb0
>> [97883.859706]  [<ffffffff9020f74d>] __alloc_pages_nodemask+0x40d/0x4b0
>> [97883.860854]  [<ffffffff90037de9>] ? sched_clock+0x9/0x10
>> [97883.862120]  [<ffffffff9026db51>] alloc_pages_current+0xa1/0x1f0
>> [97883.863251]  [<ffffffff90201d96>] __page_cache_alloc+0x146/0x190
>> [97883.864449]  [<ffffffff9020366c>] ? pagecache_get_page+0x2c/0x300
>> [97883.865602]  [<ffffffff90206055>] filemap_fault+0x345/0x790
>> [97883.866661]  [<ffffffff90206238>] ? filemap_fault+0x528/0x790
>> [97883.867795]  [<ffffffff903639d9>] ext4_filemap_fault+0x39/0x50
>> [97883.869289]  [<ffffffff90241ca3>] __do_fault+0x83/0x1d0
>> [97883.870301]  [<ffffffff90246642>] handle_mm_fault+0x11e2/0x17a0
>> [97883.871304]  [<ffffffff902454ba>] ? handle_mm_fault+0x5a/0x17a0
>> [97883.872491]  [<ffffffff9006de16>] __do_page_fault+0x266/0x520
>> [97883.873406]  [<ffffffff9006e1a8>] trace_do_page_fault+0x58/0x2a0
>> [97883.874262]  [<ffffffff90067f3a>] do_async_page_fault+0x1a/0xa0
>> [97883.875168]  [<ffffffff90918e28>] async_page_fault+0x28/0x30
>> [97883.882611] Mem-Info:
>> [97883.883747] active_anon:2915 inactive_anon:3376 isolated_anon:0
>>                  active_file:3902 inactive_file:3639 isolated_file:0
>>                  unevictable:0 dirty:205 writeback:0 unstable:0
>>                  slab_reclaimable:9856 slab_unreclaimable:9682
>>                  mapped:3722 shmem:59 pagetables:2080 bounce:0
>>                  free:748 free_pcp:15 free_cma:0
>> [97883.890766] Node 0 active_anon:11660kB inactive_anon:13504kB
>> active_file:15608kB inactive_file:14556kB unevictable:0kB isolated(anon):0kB
>> isolated(file):0kB mapped:14888kB dirty:820kB writeback:0kB shmem:0kB
>> shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 236kB writeback_tmp:0kB
>> unstable:0kB pages_scanned:168352 all_unreclaimable? yes
>> [97883.893210] Node 0 DMA free:1468kB min:172kB low:212kB high:252kB
>> active_anon:1716kB inactive_anon:912kB active_file:2292kB
>> inactive_file:876kB unevictable:0kB writepending:24kB present:15992kB
>> managed:15908kB mlocked:0kB slab_reclaimable:4652kB
>> slab_unreclaimable:2852kB kernel_stack:76kB pagetables:496kB bounce:0kB
>> free_pcp:0kB local_pcp:0kB free_cma:0kB
>> [97883.898799] lowmem_reserve[]: 0 117 117 117 117
>> [97883.899735] Node 0 DMA32 free:1524kB min:1296kB low:1620kB high:1944kB
>> active_anon:9944kB inactive_anon:12572kB active_file:13316kB
>> inactive_file:13680kB unevictable:0kB writepending:768kB present:180080kB
>> managed:139012kB mlocked:0kB slab_reclaimable:34772kB
>> slab_unreclaimable:35876kB kernel_stack:1828kB pagetables:7824kB bounce:0kB
>> free_pcp:60kB local_pcp:52kB free_cma:0kB
>> [97883.903033] lowmem_reserve[]: 0 0 0 0 0
>> [97883.904371] Node 0 DMA: 36*4kB (H) 29*8kB (H) 22*16kB (H) 9*32kB (H)
>> 3*64kB (H) 2*128kB (H) 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 1464kB
>> [97883.906442] Node 0 DMA32: 13*4kB (H) 4*8kB (H) 13*16kB (H) 8*32kB (H)
>> 9*64kB (H) 1*128kB (H) 1*256kB (H) 0*512kB 0*1024kB 0*2048kB 0*4096kB =
>> 1508kB
> (H) mean highorder atomic reserved which was introduced since v4.4 and some
> patches to use up that reserved memory went to linux-next recently via mmotm
> tree.
> It doesn't land to 4.9 so it might help to test recent linux-next tree.
> It should include [1].
>
> [1] 04c8716f7b00, mm: try to exhaust highatomic reserve before the OOM
>
Ok, 4.10.0-0.rc2.git0.1.fc26.x86_64 is not stable (4.9.0-1.fc26.x86_64 was).

The VM stops working (e.g. not pingable) after around 8h (will be 
restarted automatically), happened serveral times.

Had also further OOMs which I sent to Mincham.

Ciao,

Gerhard

Re: Still OOM problems with 4.9er kernels

[Michal Hocko]

On Wed 04-01-17 09:40:25, Gerhard Wiesinger wrote:
[...]
> Ok, 4.10.0-0.rc2.git0.1.fc26.x86_64 is not stable (4.9.0-1.fc26.x86_64 was).

Does the same happen with the vanilla kernels?

> The VM stops working (e.g. not pingable) after around 8h (will be restarted
> automatically), happened serveral times.
> 
> Had also further OOMs which I sent to Mincham.

Could you post them to the mailing list as well, please?
-- 
Michal Hocko
SUSE Labs

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Re: Still OOM problems with 4.9er/4.10er kernels

[Gerhard Wiesinger]

On 04.01.2017 10:11, Michal Hocko wrote:
>> The VM stops working (e.g. not pingable) after around 8h (will be restarted
>> automatically), happened serveral times.
>>
>> Had also further OOMs which I sent to Mincham.
> Could you post them to the mailing list as well, please?

Still OOMs on dnf update procedure with kernel 4.10: 
4.10.0-1.fc26.x86_64 as well on 4.9.9-200.fc25.x86_64

On 4.10er kernels:

Free swap  = 1137532kB

cat /etc/sysctl.d/* | grep ^vm
vm.dirty_background_ratio = 3
vm.dirty_ratio = 15
vm.overcommit_memory = 2
vm.overcommit_ratio = 80
vm.swappiness=10

kernel: python invoked oom-killer: 
gfp_mask=0x14201ca(GFP_HIGHUSER_MOVABLE|__GFP_COLD), nodemask=0, 
order=0, oom_score_adj=0
kernel: python cpuset=/ mems_allowed=0
kernel: CPU: 1 PID: 813 Comm: python Not tainted 4.10.0-1.fc26.x86_64 #1
kernel: Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 
1.9.3 04/01/2014
kernel: Call Trace:
kernel:  dump_stack+0x63/0x84
kernel:  dump_header+0x7b/0x1f6
kernel:  ? do_try_to_free_pages+0x2c5/0x340
kernel:  oom_kill_process+0x202/0x3d0
kernel:  out_of_memory+0x2b7/0x4e0
kernel:  __alloc_pages_slowpath+0x915/0xb80
kernel:  __alloc_pages_nodemask+0x218/0x2d0
kernel:  alloc_pages_current+0x93/0x150
kernel:  __page_cache_alloc+0xcf/0x100
kernel:  filemap_fault+0x39d/0x800
kernel:  ? page_add_file_rmap+0xe5/0x200
kernel:  ? filemap_map_pages+0x2e1/0x4e0
kernel:  ext4_filemap_fault+0x36/0x50
kernel:  __do_fault+0x21/0x110
kernel:  handle_mm_fault+0xdd1/0x1410
kernel:  ? swake_up+0x42/0x50
kernel:  __do_page_fault+0x23f/0x4c0
kernel:  trace_do_page_fault+0x41/0x120
kernel:  do_async_page_fault+0x51/0xa0
kernel:  async_page_fault+0x28/0x30
kernel: RIP: 0033:0x7f0681ad6350
kernel: RSP: 002b:00007ffcbdd238d8 EFLAGS: 00010246
kernel: RAX: 00007f0681b0f960 RBX: 0000000000000000 RCX: 7fffffffffffffff
kernel: RDX: 0000000000000000 RSI: 3ff0000000000000 RDI: 3ff0000000000000
kernel: RBP: 00007f067461ab40 R08: 0000000000000000 R09: 3ff0000000000000
kernel: R10: 0000556f1c6d8a80 R11: 0000000000000001 R12: 00007f0676d1a8d0
kernel: R13: 0000000000000000 R14: 00007f06746168bc R15: 00007f0674385910
kernel: Mem-Info:
kernel: active_anon:37423 inactive_anon:37512 isolated_anon:0
          active_file:462 inactive_file:603 isolated_file:0
          unevictable:0 dirty:0 writeback:0 unstable:0
          slab_reclaimable:3538 slab_unreclaimable:4818
          mapped:859 shmem:9 pagetables:3370 bounce:0
          free:1650 free_pcp:103 free_cma:0
kernel: Node 0 active_anon:149380kB inactive_anon:149704kB 
active_file:1848kB inactive_file:3660kB unevictable:0kB 
isolated(anon):128kB isolated(file):0kB mapped:4580kB dirty:0kB 
writeback:380kB shmem:0kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 
36kB writeback_tmp:0kB unstable:0kB pages_scanned:352 all_unreclaimable? no
kernel: Node 0 DMA free:1484kB min:104kB low:128kB high:152kB 
active_anon:5660kB inactive_anon:6156kB active_file:56kB 
inactive_file:64kB unevictable:0kB writepending:0kB present:15992kB 
managed:15908kB mlocked:0kB slab_reclaimable:444kB 
slab_unreclaimable:1208kB kernel_stack:32kB pagetables:592kB bounce:0kB 
free_pcp:0kB local_pcp:0kB free_cma:0kB
kernel: lowmem_reserve[]: 0 327 327 327 327
kernel: Node 0 DMA32 free:5012kB min:2264kB low:2828kB high:3392kB 
active_anon:143580kB inactive_anon:143300kB active_file:2576kB 
inactive_file:2560kB unevictable:0kB writepending:0kB present:376688kB 
managed:353968kB mlocked:0kB slab_reclaimable:13708kB 
slab_unreclaimable:18064kB kernel_stack:2352kB pagetables:12888kB 
bounce:0kB free_pcp:412kB local_pcp:88kB free_cma:0kB
kernel: lowmem_reserve[]: 0 0 0 0 0
kernel: Node 0 DMA: 70*4kB (UMEH) 20*8kB (UMEH) 13*16kB (MH) 5*32kB (H) 
4*64kB (H) 2*128kB (H) 1*256kB (H) 0*512kB 0*1024kB 0*2048kB 0*4096kB = 
1576kB
kernel: Node 0 DMA32: 1134*4kB (UMEH) 25*8kB (UMEH) 13*16kB (MH) 7*32kB 
(H) 3*64kB (H) 0*128kB 1*256kB (H) 0*512kB 0*1024kB 0*2048kB 0*4096kB = 
5616kB
kernel: Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 
hugepages_size=2048kB
kernel: 6561 total pagecache pages
kernel: 5240 pages in swap cache
kernel: Swap cache stats: add 100078658, delete 100073419, find 
199458343/238460223
kernel: Free swap  = 1137532kB
kernel: Total swap = 2064380kB
kernel: 98170 pages RAM
kernel: 0 pages HighMem/MovableOnly
kernel: 5701 pages reserved
kernel: 0 pages cma reserved
kernel: 0 pages hwpoisoned
kernel: Out of memory: Kill process 11968 (clamscan) score 170 or 
sacrifice child
kernel: Killed process 11968 (clamscan) total-vm:538120kB, 
anon-rss:182220kB, file-rss:464kB, shmem-rss:0kB

On 4.9er kernels:

Free swap  = 1826688kB

cat /etc/sysctl.d/* | grep ^vm
vm.dirty_background_ratio=3
vm.dirty_ratio=15
vm.overcommit_memory=2
vm.overcommit_ratio=80
vm.swappiness=10

kernel: dnf invoked oom-killer: 
gfp_mask=0x24280ca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO), nodemask=0, 
order=0, oom_score_adj=0
kernel: dnf cpuset=/ mems_allowed=0
kernel: CPU: 0 PID: 20049 Comm: dnf Not tainted 4.9.9-200.fc25.x86_64 #1
kernel: Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 
1.9.3 04/01/2014
kernel:  ffffa764434d7ac0 ffffffff933f467d ffffa764434d7c90 ffff9569999057c0
kernel:  ffffa764434d7b38 ffffffff932555c1 0000000000000000 0000000000000000
kernel:  ffffffffc02b2afa 00000000ffffffff 0000000000000000 ffffa764434d7b28
kernel: Call Trace:
kernel:  [<ffffffff933f467d>] dump_stack+0x63/0x86
kernel:  [<ffffffff932555c1>] dump_header+0x7b/0x1f6
kernel:  [<ffffffffc02b2afa>] ? virtballoon_oom_notify+0x2a/0x80 
[virtio_balloon]
kernel:  [<ffffffff931c711f>] oom_kill_process+0x1ff/0x3d0
kernel:  [<ffffffff931c7623>] out_of_memory+0x143/0x4e0
kernel:  [<ffffffff931cd3cd>] __alloc_pages_slowpath+0xb2d/0xc40
kernel:  [<ffffffff931cd736>] __alloc_pages_nodemask+0x256/0x2c0
kernel:  [<ffffffff9322567b>] alloc_pages_vma+0xab/0x290
kernel:  [<ffffffff931fe2ed>] handle_mm_fault+0x13bd/0x1610
kernel:  [<ffffffff9306283e>] __do_page_fault+0x23e/0x4e0
kernel:  [<ffffffff93062ba1>] trace_do_page_fault+0x41/0x120
kernel:  [<ffffffff9305caba>] do_async_page_fault+0x1a/0xa0
kernel:  [<ffffffff9381f3b8>] async_page_fault+0x28/0x30
kernel: Mem-Info:
kernel: active_anon:31057 inactive_anon:30347 isolated_anon:0
          active_file:20333 inactive_file:25749 isolated_file:32
          unevictable:0 dirty:1444 writeback:0 unstable:0
          slab_reclaimable:4537 slab_unreclaimable:5448
          mapped:15224 shmem:120 pagetables:2537 bounce:0
          free:1133 free_pcp:196 free_cma:0
kernel: Node 0 active_anon:122692kB inactive_anon:122948kB 
active_file:81332kB inactive_file:102996kB unevictable:0kB 
isolated(anon):0kB isolated(file):128kB mapped:60896kB dirty:5776kB 
writeback:0kB shmem:0kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 
480kB writeback_tmp:0kB unstable:0kB pages_scanned:962974 
all_unreclaimable? yes
kernel: Node 0 DMA free:1892kB min:92kB low:112kB high:132kB 
active_anon:544kB inactive_anon:10872kB active_file:16kB 
inactive_file:996kB unevictable:0kB writepending:1128kB present:15992kB 
managed:15908kB mlocked:0kB slab_reclaimable:488kB 
slab_unreclaimable:388kB kernel_stack:0kB pagetables:24kB bounce:0kB 
free_pcp:0kB local_pcp:0kB free_cma:0kB
kernel: lowmem_reserve[]: 0 451 451 451 451
kernel: Node 0 DMA32 free:3356kB min:2668kB low:3332kB high:3996kB 
active_anon:122148kB inactive_anon:112068kB active_file:81324kB 
inactive_file:101972kB unevictable:0kB writepending:4648kB 
present:507760kB managed:484384kB mlocked:0kB slab_reclaimable:17660kB 
slab_unreclaimable:21404kB kernel_stack:2432kB pagetables:10124kB 
bounce:0kB free_pcp:120kB local_pcp:0kB free_cma:0kB
kernel: lowmem_reserve[]: 0 0 0 0 0
kernel: Node 0 DMA: 81*4kB (UEH) 26*8kB (UMEH) 15*16kB (UH) 7*32kB (H) 
8*64kB (H) 3*128kB (H) 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 1892kB
kernel: Node 0 DMA32: 375*4kB (UMH) 18*8kB (MH) 7*16kB (MH) 6*32kB (MH) 
6*64kB (H) 4*128kB (H) 2*256kB (H) 0*512kB 0*1024kB 0*2048kB 0*4096kB = 
3356kB
kernel: Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 
hugepages_size=2048kB
kernel: 49304 total pagecache pages
kernel: 3085 pages in swap cache
kernel: Swap cache stats: add 129095, delete 126010, find 24611247/24627536
kernel: Free swap  = 1826688kB
kernel: Total swap = 2064380kB
kernel: 130938 pages RAM
kernel: 0 pages HighMem/MovableOnly
kernel: 5865 pages reserved
kernel: 0 pages cma reserved
kernel: 0 pages hwpoisoned
kernel: Out of memory: Kill process 995 (named) score 87 or sacrifice child
kernel: Killed process 995 (named) total-vm:399260kB, anon-rss:86516kB, 
file-rss:1288kB, shmem-rss:0kB
kernel: oom_reaper: reaped process 995 (named), now anon-rss:0kB, 
file-rss:0kB, shmem-rss:0kB

Should be very easy to reproduce with a low mem VM (e.g. 192MB) under 
KVM with ext4 and Fedora 25 and some memory load and updating the VM.

Any further progress?

Thnx.

Ciao,

Gerhard

Re: Still OOM problems with 4.9er/4.10er kernels

[Michal Hocko]

On Sun 26-02-17 09:40:42, Gerhard Wiesinger wrote:
> On 04.01.2017 10:11, Michal Hocko wrote:
> >>The VM stops working (e.g. not pingable) after around 8h (will be restarted
> >>automatically), happened serveral times.
> >>
> >>Had also further OOMs which I sent to Mincham.
> >Could you post them to the mailing list as well, please?
> 
> Still OOMs on dnf update procedure with kernel 4.10: 4.10.0-1.fc26.x86_64 as
> well on 4.9.9-200.fc25.x86_64
> 
> On 4.10er kernels:
[...]
> kernel: Node 0 DMA32 free:5012kB min:2264kB low:2828kB high:3392kB
> active_anon:143580kB inactive_anon:143300kB active_file:2576kB
> inactive_file:2560kB unevictable:0kB writepending:0kB present:376688kB
> managed:353968kB mlocked:0kB slab_reclaimable:13708kB
> slab_unreclaimable:18064kB kernel_stack:2352kB pagetables:12888kB bounce:0kB
> free_pcp:412kB local_pcp:88kB free_cma:0kB
[...]

> On 4.9er kernels:
[...]
> kernel: Node 0 DMA32 free:3356kB min:2668kB low:3332kB high:3996kB
> active_anon:122148kB inactive_anon:112068kB active_file:81324kB
> inactive_file:101972kB unevictable:0kB writepending:4648kB present:507760kB
> managed:484384kB mlocked:0kB slab_reclaimable:17660kB
> slab_unreclaimable:21404kB kernel_stack:2432kB pagetables:10124kB bounce:0kB
> free_pcp:120kB local_pcp:0kB free_cma:0kB

In both cases the amount if free memory is above the min watermark, so
we shouldn't be hitting the oom. We might have somebody freeing memory
after the last attempt, though...

[...]
> Should be very easy to reproduce with a low mem VM (e.g. 192MB) under KVM
> with ext4 and Fedora 25 and some memory load and updating the VM.
> 
> Any further progress?

The linux-next (resp. mmotm tree) has new tracepoints which should help
to tell us more about what is going on here. Could you try to enable
oom/reclaim_retry_zone and vmscan/mm_vmscan_direct_reclaim_{begin,end}
-- 
Michal Hocko
SUSE Labs

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Re: Still OOM problems with 4.9er/4.10er kernels

[Gerhard Wiesinger]

On 27.02.2017 09:27, Michal Hocko wrote:
> On Sun 26-02-17 09:40:42, Gerhard Wiesinger wrote:
>> On 04.01.2017 10:11, Michal Hocko wrote:
>>>> The VM stops working (e.g. not pingable) after around 8h (will be restarted
>>>> automatically), happened serveral times.
>>>>
>>>> Had also further OOMs which I sent to Mincham.
>>> Could you post them to the mailing list as well, please?
>> Still OOMs on dnf update procedure with kernel 4.10: 4.10.0-1.fc26.x86_64 as
>> well on 4.9.9-200.fc25.x86_64
>>
>> On 4.10er kernels:
> [...]
>> kernel: Node 0 DMA32 free:5012kB min:2264kB low:2828kB high:3392kB
>> active_anon:143580kB inactive_anon:143300kB active_file:2576kB
>> inactive_file:2560kB unevictable:0kB writepending:0kB present:376688kB
>> managed:353968kB mlocked:0kB slab_reclaimable:13708kB
>> slab_unreclaimable:18064kB kernel_stack:2352kB pagetables:12888kB bounce:0kB
>> free_pcp:412kB local_pcp:88kB free_cma:0kB
> [...]
>
>> On 4.9er kernels:
> [...]
>> kernel: Node 0 DMA32 free:3356kB min:2668kB low:3332kB high:3996kB
>> active_anon:122148kB inactive_anon:112068kB active_file:81324kB
>> inactive_file:101972kB unevictable:0kB writepending:4648kB present:507760kB
>> managed:484384kB mlocked:0kB slab_reclaimable:17660kB
>> slab_unreclaimable:21404kB kernel_stack:2432kB pagetables:10124kB bounce:0kB
>> free_pcp:120kB local_pcp:0kB free_cma:0kB
> In both cases the amount if free memory is above the min watermark, so
> we shouldn't be hitting the oom. We might have somebody freeing memory
> after the last attempt, though...
>
> [...]
>> Should be very easy to reproduce with a low mem VM (e.g. 192MB) under KVM
>> with ext4 and Fedora 25 and some memory load and updating the VM.
>>
>> Any further progress?
> The linux-next (resp. mmotm tree) has new tracepoints which should help
> to tell us more about what is going on here. Could you try to enable
> oom/reclaim_retry_zone and vmscan/mm_vmscan_direct_reclaim_{begin,end}

Is this available in this version?

https://koji.fedoraproject.org/koji/buildinfo?buildID=862775

kernel-4.11.0-0.rc0.git5.1.fc26

How to enable?


Thnx.

Ciao,

gerhard

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Re: Still OOM problems with 4.9er/4.10er kernels

[Michal Hocko]

On Tue 28-02-17 07:06:41, Gerhard Wiesinger wrote:
> On 27.02.2017 09:27, Michal Hocko wrote:
> >On Sun 26-02-17 09:40:42, Gerhard Wiesinger wrote:
> >>On 04.01.2017 10:11, Michal Hocko wrote:
> >>>>The VM stops working (e.g. not pingable) after around 8h (will be restarted
> >>>>automatically), happened serveral times.
> >>>>
> >>>>Had also further OOMs which I sent to Mincham.
> >>>Could you post them to the mailing list as well, please?
> >>Still OOMs on dnf update procedure with kernel 4.10: 4.10.0-1.fc26.x86_64 as
> >>well on 4.9.9-200.fc25.x86_64
> >>
> >>On 4.10er kernels:
> >[...]
> >>kernel: Node 0 DMA32 free:5012kB min:2264kB low:2828kB high:3392kB
> >>active_anon:143580kB inactive_anon:143300kB active_file:2576kB
> >>inactive_file:2560kB unevictable:0kB writepending:0kB present:376688kB
> >>managed:353968kB mlocked:0kB slab_reclaimable:13708kB
> >>slab_unreclaimable:18064kB kernel_stack:2352kB pagetables:12888kB bounce:0kB
> >>free_pcp:412kB local_pcp:88kB free_cma:0kB
> >[...]
> >
> >>On 4.9er kernels:
> >[...]
> >>kernel: Node 0 DMA32 free:3356kB min:2668kB low:3332kB high:3996kB
> >>active_anon:122148kB inactive_anon:112068kB active_file:81324kB
> >>inactive_file:101972kB unevictable:0kB writepending:4648kB present:507760kB
> >>managed:484384kB mlocked:0kB slab_reclaimable:17660kB
> >>slab_unreclaimable:21404kB kernel_stack:2432kB pagetables:10124kB bounce:0kB
> >>free_pcp:120kB local_pcp:0kB free_cma:0kB
> >In both cases the amount if free memory is above the min watermark, so
> >we shouldn't be hitting the oom. We might have somebody freeing memory
> >after the last attempt, though...
> >
> >[...]
> >>Should be very easy to reproduce with a low mem VM (e.g. 192MB) under KVM
> >>with ext4 and Fedora 25 and some memory load and updating the VM.
> >>
> >>Any further progress?
> >The linux-next (resp. mmotm tree) has new tracepoints which should help
> >to tell us more about what is going on here. Could you try to enable
> >oom/reclaim_retry_zone and vmscan/mm_vmscan_direct_reclaim_{begin,end}
> 
> Is this available in this version?
> 
> https://koji.fedoraproject.org/koji/buildinfo?buildID=862775
> 
> kernel-4.11.0-0.rc0.git5.1.fc26

no idea.

> 
> How to enable?

mount -t tracefs none /trace
echo 1 > /trace/events/oom/reclaim_retry_zone/enabled
echo 1 > /trace/events/vmscan/mm_vmscan_direct_reclaim_begin
echo 1 > /trace/events/vmscan/mm_vmscan_direct_reclaim_end
-- 
Michal Hocko
SUSE Labs

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Re: Still OOM problems with 4.9er/4.10er kernels

[Minchan Kim]

On Sun, Feb 26, 2017 at 09:40:42AM +0100, Gerhard Wiesinger wrote:
> On 04.01.2017 10:11, Michal Hocko wrote:
> >>The VM stops working (e.g. not pingable) after around 8h (will be restarted
> >>automatically), happened serveral times.
> >>
> >>Had also further OOMs which I sent to Mincham.
> >Could you post them to the mailing list as well, please?
> 
> Still OOMs on dnf update procedure with kernel 4.10: 4.10.0-1.fc26.x86_64 as
> well on 4.9.9-200.fc25.x86_64
> 
> On 4.10er kernels:
> 
> Free swap  = 1137532kB
> 
> cat /etc/sysctl.d/* | grep ^vm
> vm.dirty_background_ratio = 3
> vm.dirty_ratio = 15
> vm.overcommit_memory = 2
> vm.overcommit_ratio = 80
> vm.swappiness=10
> 
> kernel: python invoked oom-killer:
> gfp_mask=0x14201ca(GFP_HIGHUSER_MOVABLE|__GFP_COLD), nodemask=0, order=0,
> oom_score_adj=0
> kernel: python cpuset=/ mems_allowed=0
> kernel: CPU: 1 PID: 813 Comm: python Not tainted 4.10.0-1.fc26.x86_64 #1
> kernel: Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3
> 04/01/2014
> kernel: Call Trace:
> kernel:  dump_stack+0x63/0x84
> kernel:  dump_header+0x7b/0x1f6
> kernel:  ? do_try_to_free_pages+0x2c5/0x340
> kernel:  oom_kill_process+0x202/0x3d0
> kernel:  out_of_memory+0x2b7/0x4e0
> kernel:  __alloc_pages_slowpath+0x915/0xb80
> kernel:  __alloc_pages_nodemask+0x218/0x2d0
> kernel:  alloc_pages_current+0x93/0x150
> kernel:  __page_cache_alloc+0xcf/0x100
> kernel:  filemap_fault+0x39d/0x800
> kernel:  ? page_add_file_rmap+0xe5/0x200
> kernel:  ? filemap_map_pages+0x2e1/0x4e0
> kernel:  ext4_filemap_fault+0x36/0x50
> kernel:  __do_fault+0x21/0x110
> kernel:  handle_mm_fault+0xdd1/0x1410
> kernel:  ? swake_up+0x42/0x50
> kernel:  __do_page_fault+0x23f/0x4c0
> kernel:  trace_do_page_fault+0x41/0x120
> kernel:  do_async_page_fault+0x51/0xa0
> kernel:  async_page_fault+0x28/0x30
> kernel: RIP: 0033:0x7f0681ad6350
> kernel: RSP: 002b:00007ffcbdd238d8 EFLAGS: 00010246
> kernel: RAX: 00007f0681b0f960 RBX: 0000000000000000 RCX: 7fffffffffffffff
> kernel: RDX: 0000000000000000 RSI: 3ff0000000000000 RDI: 3ff0000000000000
> kernel: RBP: 00007f067461ab40 R08: 0000000000000000 R09: 3ff0000000000000
> kernel: R10: 0000556f1c6d8a80 R11: 0000000000000001 R12: 00007f0676d1a8d0
> kernel: R13: 0000000000000000 R14: 00007f06746168bc R15: 00007f0674385910
> kernel: Mem-Info:
> kernel: active_anon:37423 inactive_anon:37512 isolated_anon:0
>          active_file:462 inactive_file:603 isolated_file:0
>          unevictable:0 dirty:0 writeback:0 unstable:0
>          slab_reclaimable:3538 slab_unreclaimable:4818
>          mapped:859 shmem:9 pagetables:3370 bounce:0
>          free:1650 free_pcp:103 free_cma:0
> kernel: Node 0 active_anon:149380kB inactive_anon:149704kB
> active_file:1848kB inactive_file:3660kB unevictable:0kB isolated(anon):128kB
> isolated(file):0kB mapped:4580kB dirty:0kB writeback:380kB shmem:0kB
> shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 36kB writeback_tmp:0kB
> unstable:0kB pages_scanned:352 all_unreclaimable? no
> kernel: Node 0 DMA free:1484kB min:104kB low:128kB high:152kB
> active_anon:5660kB inactive_anon:6156kB active_file:56kB inactive_file:64kB
> unevictable:0kB writepending:0kB present:15992kB managed:15908kB mlocked:0kB
> slab_reclaimable:444kB slab_unreclaimable:1208kB kernel_stack:32kB
> pagetables:592kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
> kernel: lowmem_reserve[]: 0 327 327 327 327
> kernel: Node 0 DMA32 free:5012kB min:2264kB low:2828kB high:3392kB
> active_anon:143580kB inactive_anon:143300kB active_file:2576kB
> inactive_file:2560kB unevictable:0kB writepending:0kB present:376688kB
> managed:353968kB mlocked:0kB slab_reclaimable:13708kB
> slab_unreclaimable:18064kB kernel_stack:2352kB pagetables:12888kB bounce:0kB
> free_pcp:412kB local_pcp:88kB free_cma:0kB
> kernel: lowmem_reserve[]: 0 0 0 0 0
> kernel: Node 0 DMA: 70*4kB (UMEH) 20*8kB (UMEH) 13*16kB (MH) 5*32kB (H)
> 4*64kB (H) 2*128kB (H) 1*256kB (H) 0*512kB 0*1024kB 0*2048kB 0*4096kB =
> 1576kB
> kernel: Node 0 DMA32: 1134*4kB (UMEH) 25*8kB (UMEH) 13*16kB (MH) 7*32kB (H)
> 3*64kB (H) 0*128kB 1*256kB (H) 0*512kB 0*1024kB 0*2048kB 0*4096kB = 5616kB
 
Althogh DMA32 zone has enough free memory, free memory includes H pageblock
which is reserved memory for high-order atomic allocation. That might be
a reason you cannot succeed watermark check for the allocation.

I tried to solve the issue in 4.9 time to use up the reserved memory before
the OOM and merged into 4.10 but I think there is a hole so could you apply
this patch on top of your 4.10? (To be clear, cannot apply it to 4.9)

Re: Still OOM problems with 4.9er/4.10er kernels

[Michal Hocko]

On Mon 27-02-17 18:02:36, Minchan Kim wrote:
[...]
> >From 9779a1c5d32e2edb64da5cdfcd6f9737b94a247a Mon Sep 17 00:00:00 2001
> From: Minchan Kim <minchan@kernel.org>
> Date: Mon, 27 Feb 2017 17:39:06 +0900
> Subject: [PATCH] mm: use up highatomic before OOM kill
> 
> Not-Yet-Signed-off-by: Minchan Kim <minchan@kernel.org>
> ---
>  mm/page_alloc.c | 14 ++++----------
>  1 file changed, 4 insertions(+), 10 deletions(-)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 614cd0397ce3..e073cca4969e 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -3549,16 +3549,6 @@ should_reclaim_retry(gfp_t gfp_mask, unsigned order,
>  		*no_progress_loops = 0;
>  	else
>  		(*no_progress_loops)++;
> -
> -	/*
> -	 * Make sure we converge to OOM if we cannot make any progress
> -	 * several times in the row.
> -	 */
> -	if (*no_progress_loops > MAX_RECLAIM_RETRIES) {
> -		/* Before OOM, exhaust highatomic_reserve */
> -		return unreserve_highatomic_pageblock(ac, true);
> -	}
> -
>  	/*
>  	 * Keep reclaiming pages while there is a chance this will lead
>  	 * somewhere.  If none of the target zones can satisfy our allocation
> @@ -3821,6 +3811,10 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
>  	if (read_mems_allowed_retry(cpuset_mems_cookie))
>  		goto retry_cpuset;
>  
> +	/* Before OOM, exhaust highatomic_reserve */
> +	if (unreserve_highatomic_pageblock(ac, true))
> +		goto retry;
> +

OK, this can help for higher order requests when we do not exhaust all
the retries and fail on compaction but I fail to see how can this help
for order-0 requets which was what happened in this case. I am not
saying this is wrong, though.

>  	/* Reclaim has failed us, start killing things */
>  	page = __alloc_pages_may_oom(gfp_mask, order, ac, &did_some_progress);
>  	if (page)
> -- 
> 2.7.4

-- 
Michal Hocko
SUSE Labs

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Re: Still OOM problems with 4.9er/4.10er kernels

[Minchan Kim]

On Mon, Feb 27, 2017 at 10:44:49AM +0100, Michal Hocko wrote:
> On Mon 27-02-17 18:02:36, Minchan Kim wrote:
> [...]
> > >From 9779a1c5d32e2edb64da5cdfcd6f9737b94a247a Mon Sep 17 00:00:00 2001
> > From: Minchan Kim <minchan@kernel.org>
> > Date: Mon, 27 Feb 2017 17:39:06 +0900
> > Subject: [PATCH] mm: use up highatomic before OOM kill
> > 
> > Not-Yet-Signed-off-by: Minchan Kim <minchan@kernel.org>
> > ---
> >  mm/page_alloc.c | 14 ++++----------
> >  1 file changed, 4 insertions(+), 10 deletions(-)
> > 
> > diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> > index 614cd0397ce3..e073cca4969e 100644
> > --- a/mm/page_alloc.c
> > +++ b/mm/page_alloc.c
> > @@ -3549,16 +3549,6 @@ should_reclaim_retry(gfp_t gfp_mask, unsigned order,
> >  		*no_progress_loops = 0;
> >  	else
> >  		(*no_progress_loops)++;
> > -
> > -	/*
> > -	 * Make sure we converge to OOM if we cannot make any progress
> > -	 * several times in the row.
> > -	 */
> > -	if (*no_progress_loops > MAX_RECLAIM_RETRIES) {
> > -		/* Before OOM, exhaust highatomic_reserve */
> > -		return unreserve_highatomic_pageblock(ac, true);
> > -	}
> > -
> >  	/*
> >  	 * Keep reclaiming pages while there is a chance this will lead
> >  	 * somewhere.  If none of the target zones can satisfy our allocation
> > @@ -3821,6 +3811,10 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
> >  	if (read_mems_allowed_retry(cpuset_mems_cookie))
> >  		goto retry_cpuset;
> >  
> > +	/* Before OOM, exhaust highatomic_reserve */
> > +	if (unreserve_highatomic_pageblock(ac, true))
> > +		goto retry;
> > +
> 
> OK, this can help for higher order requests when we do not exhaust all
> the retries and fail on compaction but I fail to see how can this help
> for order-0 requets which was what happened in this case. I am not
> saying this is wrong, though.

The should_reclaim_retry can return false although no_progress_loop is less
than MAX_RECLAIM_RETRIES unless eligible zones has enough reclaimable pages
by the progress_loop. In that case, unreserve_highatomic_pageblock cannot
be called so that VM can keep a pageblock(e.g., 2M) for highatomic reserve.
Then, zone_watermark_ok subtracts nr_reserved_highatomic pages for the
pass/fail decision whichs is very conservative but no choice for the hot
path performance. With that, order-0 allocation can be failed.

Thanks.

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Re: Still OOM problems with 4.9er/4.10er kernels

[Michal Hocko]

On Tue 28-02-17 14:17:23, Minchan Kim wrote:
> On Mon, Feb 27, 2017 at 10:44:49AM +0100, Michal Hocko wrote:
> > On Mon 27-02-17 18:02:36, Minchan Kim wrote:
> > [...]
> > > >From 9779a1c5d32e2edb64da5cdfcd6f9737b94a247a Mon Sep 17 00:00:00 2001
> > > From: Minchan Kim <minchan@kernel.org>
> > > Date: Mon, 27 Feb 2017 17:39:06 +0900
> > > Subject: [PATCH] mm: use up highatomic before OOM kill
> > > 
> > > Not-Yet-Signed-off-by: Minchan Kim <minchan@kernel.org>
> > > ---
> > >  mm/page_alloc.c | 14 ++++----------
> > >  1 file changed, 4 insertions(+), 10 deletions(-)
> > > 
> > > diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> > > index 614cd0397ce3..e073cca4969e 100644
> > > --- a/mm/page_alloc.c
> > > +++ b/mm/page_alloc.c
> > > @@ -3549,16 +3549,6 @@ should_reclaim_retry(gfp_t gfp_mask, unsigned order,
> > >  		*no_progress_loops = 0;
> > >  	else
> > >  		(*no_progress_loops)++;
> > > -
> > > -	/*
> > > -	 * Make sure we converge to OOM if we cannot make any progress
> > > -	 * several times in the row.
> > > -	 */
> > > -	if (*no_progress_loops > MAX_RECLAIM_RETRIES) {
> > > -		/* Before OOM, exhaust highatomic_reserve */
> > > -		return unreserve_highatomic_pageblock(ac, true);
> > > -	}
> > > -
> > >  	/*
> > >  	 * Keep reclaiming pages while there is a chance this will lead
> > >  	 * somewhere.  If none of the target zones can satisfy our allocation
> > > @@ -3821,6 +3811,10 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
> > >  	if (read_mems_allowed_retry(cpuset_mems_cookie))
> > >  		goto retry_cpuset;
> > >  
> > > +	/* Before OOM, exhaust highatomic_reserve */
> > > +	if (unreserve_highatomic_pageblock(ac, true))
> > > +		goto retry;
> > > +
> > 
> > OK, this can help for higher order requests when we do not exhaust all
> > the retries and fail on compaction but I fail to see how can this help
> > for order-0 requets which was what happened in this case. I am not
> > saying this is wrong, though.
> 
> The should_reclaim_retry can return false although no_progress_loop is less
> than MAX_RECLAIM_RETRIES unless eligible zones has enough reclaimable pages
> by the progress_loop.

Yes, sorry I should have been more clear. I was talking about this
particular case where we had a lot of reclaimable pages (a lot of
anonymous with the swap available).

-- 
Michal Hocko
SUSE Labs

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Re: Still OOM problems with 4.9er/4.10er kernels

[Minchan Kim]

Hi Michal,

On Tue, Feb 28, 2017 at 09:12:24AM +0100, Michal Hocko wrote:
> On Tue 28-02-17 14:17:23, Minchan Kim wrote:
> > On Mon, Feb 27, 2017 at 10:44:49AM +0100, Michal Hocko wrote:
> > > On Mon 27-02-17 18:02:36, Minchan Kim wrote:
> > > [...]
> > > > >From 9779a1c5d32e2edb64da5cdfcd6f9737b94a247a Mon Sep 17 00:00:00 2001
> > > > From: Minchan Kim <minchan@kernel.org>
> > > > Date: Mon, 27 Feb 2017 17:39:06 +0900
> > > > Subject: [PATCH] mm: use up highatomic before OOM kill
> > > > 
> > > > Not-Yet-Signed-off-by: Minchan Kim <minchan@kernel.org>
> > > > ---
> > > >  mm/page_alloc.c | 14 ++++----------
> > > >  1 file changed, 4 insertions(+), 10 deletions(-)
> > > > 
> > > > diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> > > > index 614cd0397ce3..e073cca4969e 100644
> > > > --- a/mm/page_alloc.c
> > > > +++ b/mm/page_alloc.c
> > > > @@ -3549,16 +3549,6 @@ should_reclaim_retry(gfp_t gfp_mask, unsigned order,
> > > >  		*no_progress_loops = 0;
> > > >  	else
> > > >  		(*no_progress_loops)++;
> > > > -
> > > > -	/*
> > > > -	 * Make sure we converge to OOM if we cannot make any progress
> > > > -	 * several times in the row.
> > > > -	 */
> > > > -	if (*no_progress_loops > MAX_RECLAIM_RETRIES) {
> > > > -		/* Before OOM, exhaust highatomic_reserve */
> > > > -		return unreserve_highatomic_pageblock(ac, true);
> > > > -	}
> > > > -
> > > >  	/*
> > > >  	 * Keep reclaiming pages while there is a chance this will lead
> > > >  	 * somewhere.  If none of the target zones can satisfy our allocation
> > > > @@ -3821,6 +3811,10 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
> > > >  	if (read_mems_allowed_retry(cpuset_mems_cookie))
> > > >  		goto retry_cpuset;
> > > >  
> > > > +	/* Before OOM, exhaust highatomic_reserve */
> > > > +	if (unreserve_highatomic_pageblock(ac, true))
> > > > +		goto retry;
> > > > +
> > > 
> > > OK, this can help for higher order requests when we do not exhaust all
> > > the retries and fail on compaction but I fail to see how can this help
> > > for order-0 requets which was what happened in this case. I am not
> > > saying this is wrong, though.
> > 
> > The should_reclaim_retry can return false although no_progress_loop is less
> > than MAX_RECLAIM_RETRIES unless eligible zones has enough reclaimable pages
> > by the progress_loop.
> 
> Yes, sorry I should have been more clear. I was talking about this
> particular case where we had a lot of reclaimable pages (a lot of
> anonymous with the swap available).

This reports shows two problems. Why we see OOM 1) enough *free* pages and
2) enough *freeable* pages.

I just pointed out 1) and sent the patch to solve it.

About 2), one of my imaginary scenario is inactive anon list is full of
pinned pages so VM can unmap them successfully in shrink_page_list but fail
to free due to increased page refcount. In that case, the page will be added
to inactive anonymous LRU list again without activating so inactive_list_is_low
on anonymous LRU is always false. IOW, there is no deactivation from active list.

It's just my picture without no clue. ;-)

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Re: Still OOM problems with 4.9er/4.10er kernels

[Gerhard Wiesinger]

On 02.03.2017 08:17, Minchan Kim wrote:
> Hi Michal,
>
> On Tue, Feb 28, 2017 at 09:12:24AM +0100, Michal Hocko wrote:
>> On Tue 28-02-17 14:17:23, Minchan Kim wrote:
>>> On Mon, Feb 27, 2017 at 10:44:49AM +0100, Michal Hocko wrote:
>>>> On Mon 27-02-17 18:02:36, Minchan Kim wrote:
>>>> [...]
>>>>> >From 9779a1c5d32e2edb64da5cdfcd6f9737b94a247a Mon Sep 17 00:00:00 2001
>>>>> From: Minchan Kim <minchan@kernel.org>
>>>>> Date: Mon, 27 Feb 2017 17:39:06 +0900
>>>>> Subject: [PATCH] mm: use up highatomic before OOM kill
>>>>>
>>>>> Not-Yet-Signed-off-by: Minchan Kim <minchan@kernel.org>
>>>>> ---
>>>>>   mm/page_alloc.c | 14 ++++----------
>>>>>   1 file changed, 4 insertions(+), 10 deletions(-)
>>>>>
>>>>> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
>>>>> index 614cd0397ce3..e073cca4969e 100644
>>>>> --- a/mm/page_alloc.c
>>>>> +++ b/mm/page_alloc.c
>>>>> @@ -3549,16 +3549,6 @@ should_reclaim_retry(gfp_t gfp_mask, unsigned order,
>>>>>   		*no_progress_loops = 0;
>>>>>   	else
>>>>>   		(*no_progress_loops)++;
>>>>> -
>>>>> -	/*
>>>>> -	 * Make sure we converge to OOM if we cannot make any progress
>>>>> -	 * several times in the row.
>>>>> -	 */
>>>>> -	if (*no_progress_loops > MAX_RECLAIM_RETRIES) {
>>>>> -		/* Before OOM, exhaust highatomic_reserve */
>>>>> -		return unreserve_highatomic_pageblock(ac, true);
>>>>> -	}
>>>>> -
>>>>>   	/*
>>>>>   	 * Keep reclaiming pages while there is a chance this will lead
>>>>>   	 * somewhere.  If none of the target zones can satisfy our allocation
>>>>> @@ -3821,6 +3811,10 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
>>>>>   	if (read_mems_allowed_retry(cpuset_mems_cookie))
>>>>>   		goto retry_cpuset;
>>>>>   
>>>>> +	/* Before OOM, exhaust highatomic_reserve */
>>>>> +	if (unreserve_highatomic_pageblock(ac, true))
>>>>> +		goto retry;
>>>>> +
>>>> OK, this can help for higher order requests when we do not exhaust all
>>>> the retries and fail on compaction but I fail to see how can this help
>>>> for order-0 requets which was what happened in this case. I am not
>>>> saying this is wrong, though.
>>> The should_reclaim_retry can return false although no_progress_loop is less
>>> than MAX_RECLAIM_RETRIES unless eligible zones has enough reclaimable pages
>>> by the progress_loop.
>> Yes, sorry I should have been more clear. I was talking about this
>> particular case where we had a lot of reclaimable pages (a lot of
>> anonymous with the swap available).
> This reports shows two problems. Why we see OOM 1) enough *free* pages and
> 2) enough *freeable* pages.
>
> I just pointed out 1) and sent the patch to solve it.
>
> About 2), one of my imaginary scenario is inactive anon list is full of
> pinned pages so VM can unmap them successfully in shrink_page_list but fail
> to free due to increased page refcount. In that case, the page will be added
> to inactive anonymous LRU list again without activating so inactive_list_is_low
> on anonymous LRU is always false. IOW, there is no deactivation from active list.
>
> It's just my picture without no clue. ;-)

With latest kernels (4.11.0-0.rc2.git0.2.fc26.x86_64) I'm having the 
issue that swapping is active all the time after some runtime (~1day).

top - 07:30:17 up 1 day, 19:42,  1 user,  load average: 13.71, 16.98, 15.36
Tasks: 130 total,   2 running, 128 sleeping,   0 stopped, 0 zombie
%Cpu(s): 15.8 us, 33.5 sy,  0.0 ni,  3.9 id, 34.5 wa,  4.9 hi,  1.0 si,  
6.4 st
KiB Mem :   369700 total,     5484 free,   311556 used, 52660 buff/cache
KiB Swap:  2064380 total,  1187684 free,   876696 used. 20340 avail Mem

[root@smtp ~]# vmstat 1
procs -----------memory---------- ---swap-- -----io---- -system-- 
------cpu-----
  r  b   swpd   free   buff  cache   si   so    bi    bo in   cs us sy 
id wa st
  3  1 876280   7132  16536  64840  238  226  1027   258 80   97  2  3 
83 11  1
  0  4 876140   3812  10520  64552 3676  168 11840  1100 2255 2582  7 
13  8 70  3
  0  3 875372   3628   4024  56160 5424   64 10004   476 2157 2580  2 
14  0 83  2
  0  4 875560  24056   2208  56296 9032 2180 39928  2388 4111 4549 10 
32  0 55  3
  2  2 875660   7540   5256  58220 5536 1604 48756  1864 4505 4196 12 
23  5 58  3
  0  3 875264   3664   2120  57596 2304  116 17904   560 2223 1825 15 
15  0 67  3
  0  2 875564   3800    588  57856 1340 1068 14780  1184 1390 1364 12 
10  0 77  3
  1  2 875724   3740    372  53988 3104  928 16884  1068 1560 1527  3 
12  0 83  3
  0  3 881096   3708    532  52220 4604 5872 21004  6104 2752 2259  7 
18  5 67  2

The following commit is included in that version:
commit 710531320af876192d76b2c1f68190a1df941b02
Author: Michal Hocko <mhocko@suse.com>
Date:   Wed Feb 22 15:45:58 2017 -0800

     mm, vmscan: cleanup lru size claculations

     commit fd538803731e50367b7c59ce4ad3454426a3d671 upstream.

But still OOMs:
[157048.030760] clamscan: page allocation stalls for 19405ms, order:0, 
mode:0x14200ca(GFP_HIGHUSER_MOVABLE), nodemask=(null)
[157048.031985] clamscan cpuset=/ mems_allowed=0
[157048.031993] CPU: 1 PID: 9597 Comm: clamscan Not tainted 
4.11.0-0.rc2.git0.2.fc26.x86_64 #1
[157048.033197] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), 
BIOS 1.9.3 04/01/2014
[157048.034382] Call Trace:
[157048.035532]  dump_stack+0x63/0x84
[157048.036735]  warn_alloc+0x10c/0x1b0
[157048.037768]  __alloc_pages_slowpath+0x93d/0xe60
[157048.038873]  ? dd_dispatch_request+0x2b/0x1a0
[157048.041033]  ? get_page_from_freelist+0x122/0xbf0
[157048.042435]  __alloc_pages_nodemask+0x290/0x2b0
[157048.043662]  alloc_pages_vma+0xa0/0x2b0
[157048.044796]  __read_swap_cache_async+0x146/0x210
[157048.045841]  read_swap_cache_async+0x26/0x60
[157048.046858]  swapin_readahead+0x186/0x230
[157048.047854]  ? radix_tree_lookup_slot+0x22/0x50
[157048.049006]  ? find_get_entry+0x20/0x140
[157048.053109]  ? pagecache_get_page+0x2c/0x2e0
[157048.054179]  do_swap_page+0x276/0x7b0
[157048.055138]  __handle_mm_fault+0x6fd/0x1160
[157048.057571]  ? pick_next_task_fair+0x48c/0x560
[157048.058608]  handle_mm_fault+0xb3/0x250
[157048.059622]  __do_page_fault+0x23f/0x4c0
[157048.068926]  trace_do_page_fault+0x41/0x120
[157048.070143]  do_async_page_fault+0x51/0xa0
[157048.071254]  async_page_fault+0x28/0x30
[157048.072606] RIP: 0033:0x7f78659eb675
[157048.073858] RSP: 002b:00007ffcaba111b8 EFLAGS: 00010202
[157048.075192] RAX: 0000000000000941 RBX: 00007f785957e8d0 RCX: 
00007f784e968b48
[157048.076609] RDX: 00007f784f87bce8 RSI: 00007f7851fdb0cb RDI: 
00007f7866726000
[157048.077809] RBP: 00007f785957e910 R08: 0000000000040000 R09: 
0000000000000000
[157048.078935] R10: ffffffffffffff48 R11: 0000000000000246 R12: 
00007f78600c81c0
[157048.080028] R13: 00007f785957e970 R14: 00007f78594ffba8 R15: 
0000000003406237
[157048.081827] Mem-Info:
[157048.083005] active_anon:19902 inactive_anon:19920 isolated_anon:383
                  active_file:816 inactive_file:529 isolated_file:0
                  unevictable:0 dirty:0 writeback:19 unstable:0
                  slab_reclaimable:4225 slab_unreclaimable:6483
                  mapped:942 shmem:3 pagetables:3553 bounce:0
                  free:944 free_pcp:87 free_cma:0
[157048.089470] Node 0 active_anon:79552kB inactive_anon:79588kB 
active_file:3108kB inactive_file:2144kB unevictable:0kB 
isolated(anon):1624kB isolated(file):0kB mapped:3612kB dirty:0kB 
writeback:76kB shmem:0kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 
12kB writeback_tmp:0kB unstable:0kB pages_scanned:247 all_unreclaimable? no
[157048.092318] Node 0 DMA free:1408kB min:104kB low:128kB high:152kB 
active_anon:664kB inactive_anon:3124kB active_file:48kB 
inactive_file:40kB unevictable:0kB writepending:0kB present:15992kB 
managed:15908kB mlocked:0kB slab_reclaimable:564kB 
slab_unreclaimable:2148kB kernel_stack:92kB pagetables:1328kB bounce:0kB 
free_pcp:0kB local_pcp:0kB free_cma:0kB
[157048.096008] lowmem_reserve[]: 0 327 327 327 327
[157048.097234] Node 0 DMA32 free:2576kB min:2264kB low:2828kB 
high:3392kB active_anon:78844kB inactive_anon:76612kB active_file:2840kB 
inactive_file:1896kB unevictable:0kB writepending:76kB present:376688kB 
managed:353792kB mlocked:0kB slab_reclaimable:16336kB 
slab_unreclaimable:23784kB kernel_stack:2388kB pagetables:12884kB 
bounce:0kB free_pcp:644kB local_pcp:312kB free_cma:0kB
[157048.101118] lowmem_reserve[]: 0 0 0 0 0
[157048.102190] Node 0 DMA: 37*4kB (UEH) 12*8kB (H) 13*16kB (H) 10*32kB 
(H) 4*64kB (H) 3*128kB (H) 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 
1412kB
[157048.104989] Node 0 DMA32: 79*4kB (UMEH) 199*8kB (UMEH) 18*16kB (UMH) 
5*32kB (H) 2*64kB (H) 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB 
= 2484kB
[157048.107789] Node 0 hugepages_total=0 hugepages_free=0 
hugepages_surp=0 hugepages_size=2048kB
[157048.107790] 2027 total pagecache pages
[157048.109125] 710 pages in swap cache
[157048.115088] Swap cache stats: add 36179491, delete 36179123, find 
86964755/101977142
[157048.116934] Free swap  = 808064kB
[157048.118466] Total swap = 2064380kB
[157048.122828] 98170 pages RAM
[157048.124039] 0 pages HighMem/MovableOnly
[157048.125051] 5745 pages reserved
[157048.125997] 0 pages cma reserved
[157048.127008] 0 pages hwpoisoned


Thnx.

Ciao,
Gerhard

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Re: Still OOM problems with 4.9er/4.10er kernels

[Michal Hocko]

On Thu 16-03-17 07:38:08, Gerhard Wiesinger wrote:
[...]
> The following commit is included in that version:
> commit 710531320af876192d76b2c1f68190a1df941b02
> Author: Michal Hocko <mhocko@suse.com>
> Date:   Wed Feb 22 15:45:58 2017 -0800
> 
>     mm, vmscan: cleanup lru size claculations
> 
>     commit fd538803731e50367b7c59ce4ad3454426a3d671 upstream.

This patch shouldn't make any difference. It is a cleanup patch.
I guess you meant 71ab6cfe88dc ("mm, vmscan: consider eligible zones in
get_scan_count") but even that one shouldn't make any difference for 64b
systems.

> But still OOMs:
> [157048.030760] clamscan: page allocation stalls for 19405ms, order:0, mode:0x14200ca(GFP_HIGHUSER_MOVABLE), nodemask=(null)

This is not OOM it is an allocation stall. The allocation request cannot
simply make forward progress for more than 10s. This alone is bad but
considering this is GFP_HIGHUSER_MOVABLE which has the full reclaim
capabilities I would suspect your workload overcommits the available
memory too much. You only have ~380MB of RAM with ~160MB sitting in the
anonymous memory, almost nothing in the page cache so I am not wondering
that you see a constant swap activity. There seems to be only 40M in the
slab so we are still missing ~180MB which is neither on the LRU lists
nor allocated by slab. This means that some kernel subsystem allocates
from the page allocator directly.

That being said, I believe that what you are seeing is not a bug in the
MM subsystem but rather some susbsytem using more memory than it used to
before so your workload doesn't fit into the amount of memory you have
anymore.

[...]
> [157048.081827] Mem-Info:
> [157048.083005] active_anon:19902 inactive_anon:19920 isolated_anon:383
>                  active_file:816 inactive_file:529 isolated_file:0
>                  unevictable:0 dirty:0 writeback:19 unstable:0
>                  slab_reclaimable:4225 slab_unreclaimable:6483
>                  mapped:942 shmem:3 pagetables:3553 bounce:0
>                  free:944 free_pcp:87 free_cma:0
> [157048.089470] Node 0 active_anon:79552kB inactive_anon:79588kB
> active_file:3108kB inactive_file:2144kB unevictable:0kB
> isolated(anon):1624kB isolated(file):0kB mapped:3612kB dirty:0kB
> writeback:76kB shmem:0kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 12kB
> writeback_tmp:0kB unstable:0kB pages_scanned:247 all_unreclaimable? no
> [157048.092318] Node 0 DMA free:1408kB min:104kB low:128kB high:152kB
> active_anon:664kB inactive_anon:3124kB active_file:48kB inactive_file:40kB
> unevictable:0kB writepending:0kB present:15992kB managed:15908kB mlocked:0kB
> slab_reclaimable:564kB slab_unreclaimable:2148kB kernel_stack:92kB
> pagetables:1328kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
> [157048.096008] lowmem_reserve[]: 0 327 327 327 327
> [157048.097234] Node 0 DMA32 free:2576kB min:2264kB low:2828kB high:3392kB
> active_anon:78844kB inactive_anon:76612kB active_file:2840kB
> inactive_file:1896kB unevictable:0kB writepending:76kB present:376688kB
> managed:353792kB mlocked:0kB slab_reclaimable:16336kB
> slab_unreclaimable:23784kB kernel_stack:2388kB pagetables:12884kB bounce:0kB
> free_pcp:644kB local_pcp:312kB free_cma:0kB
> [157048.101118] lowmem_reserve[]: 0 0 0 0 0
> [157048.102190] Node 0 DMA: 37*4kB (UEH) 12*8kB (H) 13*16kB (H) 10*32kB (H)
> 4*64kB (H) 3*128kB (H) 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 1412kB
> [157048.104989] Node 0 DMA32: 79*4kB (UMEH) 199*8kB (UMEH) 18*16kB (UMH)
> 5*32kB (H) 2*64kB (H) 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB =
> 2484kB
> [157048.107789] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0
> hugepages_size=2048kB
> [157048.107790] 2027 total pagecache pages
> [157048.109125] 710 pages in swap cache
> [157048.115088] Swap cache stats: add 36179491, delete 36179123, find
> 86964755/101977142
> [157048.116934] Free swap  = 808064kB
> [157048.118466] Total swap = 2064380kB
> [157048.122828] 98170 pages RAM
> [157048.124039] 0 pages HighMem/MovableOnly
> [157048.125051] 5745 pages reserved
> [157048.125997] 0 pages cma reserved
> [157048.127008] 0 pages hwpoisoned
> 
> 
> Thnx.
> 
> Ciao,
> Gerhard

-- 
Michal Hocko
SUSE Labs

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Re: Still OOM problems with 4.9er/4.10er kernels

[lkml]

On Thu, Mar 16, 2017 at 09:27:14AM +0100, Michal Hocko wrote:
> On Thu 16-03-17 07:38:08, Gerhard Wiesinger wrote:
> [...]
> > The following commit is included in that version:
> > commit 710531320af876192d76b2c1f68190a1df941b02
> > Author: Michal Hocko <mhocko@suse.com>
> > Date:   Wed Feb 22 15:45:58 2017 -0800
> > 
> >     mm, vmscan: cleanup lru size claculations
> > 
> >     commit fd538803731e50367b7c59ce4ad3454426a3d671 upstream.
> 
> This patch shouldn't make any difference. It is a cleanup patch.
> I guess you meant 71ab6cfe88dc ("mm, vmscan: consider eligible zones in
> get_scan_count") but even that one shouldn't make any difference for 64b
> systems.
> 
> > But still OOMs:
> > [157048.030760] clamscan: page allocation stalls for 19405ms, order:0, mode:0x14200ca(GFP_HIGHUSER_MOVABLE), nodemask=(null)
> 
> This is not OOM it is an allocation stall. The allocation request cannot
> simply make forward progress for more than 10s. This alone is bad but
> considering this is GFP_HIGHUSER_MOVABLE which has the full reclaim
> capabilities I would suspect your workload overcommits the available
> memory too much. You only have ~380MB of RAM with ~160MB sitting in the
> anonymous memory, almost nothing in the page cache so I am not wondering
> that you see a constant swap activity. There seems to be only 40M in the
> slab so we are still missing ~180MB which is neither on the LRU lists
> nor allocated by slab. This means that some kernel subsystem allocates
> from the page allocator directly.
> 
> That being said, I believe that what you are seeing is not a bug in the
> MM subsystem but rather some susbsytem using more memory than it used to
> before so your workload doesn't fit into the amount of memory you have
> anymore.
> 

While on the topic of understanding allocation stalls, Philip Freeman recently
mailed linux-kernel with a similar report, and in his case there are plenty of
page cache pages.  It was also a GFP_HIGHUSER_MOVABLE 0-order allocation.

I'm no MM expert, but it appears a bit broken for such a low-order allocation
to stall on the order of 10 seconds when there's plenty of reclaimable pages,
in addition to mostly unused and abundant swap space on SSD.

Regards,
Vito Caputo

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Re: Still OOM problems with 4.9er/4.10er kernels

[Michal Hocko]

On Thu 16-03-17 01:47:33, lkml@pengaru.com wrote:
[...]
> While on the topic of understanding allocation stalls, Philip Freeman recently
> mailed linux-kernel with a similar report, and in his case there are plenty of
> page cache pages.  It was also a GFP_HIGHUSER_MOVABLE 0-order allocation.

care to point me to the report?
 
> I'm no MM expert, but it appears a bit broken for such a low-order allocation
> to stall on the order of 10 seconds when there's plenty of reclaimable pages,
> in addition to mostly unused and abundant swap space on SSD.

yes this might indeed signal a problem.
-- 
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SUSE Labs

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Re: Still OOM problems with 4.9er/4.10er kernels

[lkml]

On Thu, Mar 16, 2017 at 10:08:44AM +0100, Michal Hocko wrote:
> On Thu 16-03-17 01:47:33, lkml@pengaru.com wrote:
> [...]
> > While on the topic of understanding allocation stalls, Philip Freeman recently
> > mailed linux-kernel with a similar report, and in his case there are plenty of
> > page cache pages.  It was also a GFP_HIGHUSER_MOVABLE 0-order allocation.
> 
> care to point me to the report?

http://lkml.iu.edu/hypermail/linux/kernel/1703.1/06360.html

>  
> > I'm no MM expert, but it appears a bit broken for such a low-order allocation
> > to stall on the order of 10 seconds when there's plenty of reclaimable pages,
> > in addition to mostly unused and abundant swap space on SSD.
> 
> yes this might indeed signal a problem.

Well maybe I missed something obvious that a better informed eye will catch.

Regards,
Vito Caputo

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Re: Still OOM problems with 4.9er/4.10er kernels

[Michal Hocko]

On Thu 16-03-17 02:23:18, lkml@pengaru.com wrote:
> On Thu, Mar 16, 2017 at 10:08:44AM +0100, Michal Hocko wrote:
> > On Thu 16-03-17 01:47:33, lkml@pengaru.com wrote:
> > [...]
> > > While on the topic of understanding allocation stalls, Philip Freeman recently
> > > mailed linux-kernel with a similar report, and in his case there are plenty of
> > > page cache pages.  It was also a GFP_HIGHUSER_MOVABLE 0-order allocation.
> > 
> > care to point me to the report?
> 
> http://lkml.iu.edu/hypermail/linux/kernel/1703.1/06360.html

Thanks. It is gone from my lkml mailbox. Could you CC me (and linux-mm) please?
 
> >  
> > > I'm no MM expert, but it appears a bit broken for such a low-order allocation
> > > to stall on the order of 10 seconds when there's plenty of reclaimable pages,
> > > in addition to mostly unused and abundant swap space on SSD.
> > 
> > yes this might indeed signal a problem.
> 
> Well maybe I missed something obvious that a better informed eye will catch.

Nothing really obvious. There is indeed a lot of anonymous memory to
swap out. Almost no pages on file LRU lists (active_file:759
inactive_file:749) but 158783 total pagecache pages so we have to have a
lot of pages in the swap cache. I would probably have to see more data
to make a full picture.

-- 
Michal Hocko
SUSE Labs

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Re: Still OOM problems with 4.9er/4.10er kernels

[Gerhard Wiesinger]

On 16.03.2017 10:39, Michal Hocko wrote:
> On Thu 16-03-17 02:23:18, lkml@pengaru.com wrote:
>> On Thu, Mar 16, 2017 at 10:08:44AM +0100, Michal Hocko wrote:
>>> On Thu 16-03-17 01:47:33, lkml@pengaru.com wrote:
>>> [...]
>>>> While on the topic of understanding allocation stalls, Philip Freeman recently
>>>> mailed linux-kernel with a similar report, and in his case there are plenty of
>>>> page cache pages.  It was also a GFP_HIGHUSER_MOVABLE 0-order allocation.
>>> care to point me to the report?
>> http://lkml.iu.edu/hypermail/linux/kernel/1703.1/06360.html
> Thanks. It is gone from my lkml mailbox. Could you CC me (and linux-mm) please?
>   
>>>   
>>>> I'm no MM expert, but it appears a bit broken for such a low-order allocation
>>>> to stall on the order of 10 seconds when there's plenty of reclaimable pages,
>>>> in addition to mostly unused and abundant swap space on SSD.
>>> yes this might indeed signal a problem.
>> Well maybe I missed something obvious that a better informed eye will catch.
> Nothing really obvious. There is indeed a lot of anonymous memory to
> swap out. Almost no pages on file LRU lists (active_file:759
> inactive_file:749) but 158783 total pagecache pages so we have to have a
> lot of pages in the swap cache. I would probably have to see more data
> to make a full picture.
>

Why does the kernel prefer to swapin/out and not use

a.) the free memory?

b.) the buffer/cache?

There is ~100M memory available but kernel swaps all the time ...

Any ideas?

Kernel: 4.9.14-200.fc25.x86_64

top - 17:33:43 up 28 min,  3 users,  load average: 3.58, 1.67, 0.89
Tasks: 145 total,   4 running, 141 sleeping,   0 stopped,   0 zombie
%Cpu(s): 19.1 us, 56.2 sy,  0.0 ni,  4.3 id, 13.4 wa, 2.0 hi,  0.3 si,  
4.7 st
KiB Mem :   230076 total,    61508 free,   123472 used,    45096 buff/cache

procs -----------memory---------- ---swap-- -----io---- -system-- 
------cpu-----
  r  b   swpd   free   buff  cache   si   so    bi    bo in   cs us sy 
id wa st
  3  5 303916  60372    328  43864 27828  200 41420   236 6984 11138 11 
47  6 23 14
  5  4 292852  52904    756  58584 19600  448 48780   540 8088 10528 18 
61  1  7 13
  3  3 288792  49052   1152  65924 4856  576  9824  1100 4324 5720  7 
18  2 64  8
  2  2 283676  54160    716  67604 6332  344 31740   964 3879 5055 12 34 
10 37  7
  3  3 286852  66712    216  53136 28064 4832 56532  4920 9175 12625 10 
55 12 14 10
  2  0 299680  62428    196  53316 36312 13164 54728 13212 16820 25283  
7 56 18 12  7
  1  1 300756  63220    624  58160 17944 1260 24528  1304 5804 9302  3 
22 38 34  3

Thnx.


Ciao,

Gerhard

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Re: Still OOM problems with 4.9er/4.10er kernels

[Michal Hocko]

On Fri 17-03-17 17:37:48, Gerhard Wiesinger wrote:
[...]
> Why does the kernel prefer to swapin/out and not use
> 
> a.) the free memory?

It will use all the free memory up to min watermark which is set up
based on min_free_kbytes.

> b.) the buffer/cache?

the memory reclaim is strongly biased towards page cache and we try to
avoid swapout as much as possible (see get_scan_count).
 
> There is ~100M memory available but kernel swaps all the time ...
> 
> Any ideas?
> 
> Kernel: 4.9.14-200.fc25.x86_64
> 
> top - 17:33:43 up 28 min,  3 users,  load average: 3.58, 1.67, 0.89
> Tasks: 145 total,   4 running, 141 sleeping,   0 stopped,   0 zombie
> %Cpu(s): 19.1 us, 56.2 sy,  0.0 ni,  4.3 id, 13.4 wa, 2.0 hi,  0.3 si,  4.7
> st
> KiB Mem :   230076 total,    61508 free,   123472 used,    45096 buff/cache
> 
> procs -----------memory---------- ---swap-- -----io---- -system--
> ------cpu-----
>  r  b   swpd   free   buff  cache   si   so    bi    bo in   cs us sy id wa st
>  3  5 303916  60372    328  43864 27828  200 41420   236 6984 11138 11 47  6 23 14

I am really surprised to see any reclaim at all. 26% of free memory
doesn't sound as if we should do a reclaim at all. Do you have an
unusual configuration of /proc/sys/vm/min_free_kbytes ? Or is there
anything running inside a memory cgroup with a small limit?
-- 
Michal Hocko
SUSE Labs

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Re: Still OOM problems with 4.9er/4.10er kernels

[Gerhard Wiesinger]

On 17.03.2017 18:13, Michal Hocko wrote:
> On Fri 17-03-17 17:37:48, Gerhard Wiesinger wrote:
> [...]
>> Why does the kernel prefer to swapin/out and not use
>>
>> a.) the free memory?
> It will use all the free memory up to min watermark which is set up
> based on min_free_kbytes.

Makes sense, how is /proc/sys/vm/min_free_kbytes default value calculated?

>
>> b.) the buffer/cache?
> the memory reclaim is strongly biased towards page cache and we try to
> avoid swapout as much as possible (see get_scan_count).

If I understand it correctly, swapping is preferred over dropping the 
cache, right. Can this behaviour be changed to prefer dropping the cache 
to some minimum amount?
Is this also configurable in a way?
(As far as I remember e.g. kernel 2.4 dropped the caches well).

>   
>> There is ~100M memory available but kernel swaps all the time ...
>>
>> Any ideas?
>>
>> Kernel: 4.9.14-200.fc25.x86_64
>>
>> top - 17:33:43 up 28 min,  3 users,  load average: 3.58, 1.67, 0.89
>> Tasks: 145 total,   4 running, 141 sleeping,   0 stopped,   0 zombie
>> %Cpu(s): 19.1 us, 56.2 sy,  0.0 ni,  4.3 id, 13.4 wa, 2.0 hi,  0.3 si,  4.7
>> st
>> KiB Mem :   230076 total,    61508 free,   123472 used,    45096 buff/cache
>>
>> procs -----------memory---------- ---swap-- -----io---- -system--
>> ------cpu-----
>>   r  b   swpd   free   buff  cache   si   so    bi    bo in   cs us sy id wa st
>>   3  5 303916  60372    328  43864 27828  200 41420   236 6984 11138 11 47  6 23 14
> I am really surprised to see any reclaim at all. 26% of free memory
> doesn't sound as if we should do a reclaim at all. Do you have an
> unusual configuration of /proc/sys/vm/min_free_kbytes ? Or is there
> anything running inside a memory cgroup with a small limit?

nothing special set regarding /proc/sys/vm/min_free_kbytes (default 
values), detailed config below. Regarding cgroups, none of I know. How 
to check (I guess nothing is set because cg* commands are not available)?

cat /etc/sysctl.d/* | grep "^vm"
vm.dirty_background_ratio = 3
vm.dirty_ratio = 15
vm.overcommit_memory = 2
vm.overcommit_ratio = 80
vm.swappiness=10

find /proc/sys/vm -type f -exec echo {} \; -exec cat {} \;
/proc/sys/vm/admin_reserve_kbytes
8192
/proc/sys/vm/block_dump
0
/proc/sys/vm/compact_memory
cat: /proc/sys/vm/compact_memory: Permission denied
/proc/sys/vm/compact_unevictable_allowed
1
/proc/sys/vm/dirty_background_bytes
0
/proc/sys/vm/dirty_background_ratio
3
/proc/sys/vm/dirty_bytes
0
/proc/sys/vm/dirty_expire_centisecs
3000
/proc/sys/vm/dirty_ratio
15
/proc/sys/vm/dirty_writeback_centisecs
500
/proc/sys/vm/dirtytime_expire_seconds
43200
/proc/sys/vm/drop_caches
0
/proc/sys/vm/extfrag_threshold
500
/proc/sys/vm/hugepages_treat_as_movable
0
/proc/sys/vm/hugetlb_shm_group
0
/proc/sys/vm/laptop_mode
0
/proc/sys/vm/legacy_va_layout
0
/proc/sys/vm/lowmem_reserve_ratio
256     256     32      1
/proc/sys/vm/max_map_count
65530
/proc/sys/vm/memory_failure_early_kill
0
/proc/sys/vm/memory_failure_recovery
1
/proc/sys/vm/min_free_kbytes
45056
/proc/sys/vm/min_slab_ratio
5
/proc/sys/vm/min_unmapped_ratio
1
/proc/sys/vm/mmap_min_addr
65536
/proc/sys/vm/mmap_rnd_bits
28
/proc/sys/vm/mmap_rnd_compat_bits
8
/proc/sys/vm/nr_hugepages
0
/proc/sys/vm/nr_hugepages_mempolicy
0
/proc/sys/vm/nr_overcommit_hugepages
0
/proc/sys/vm/nr_pdflush_threads
0
/proc/sys/vm/numa_zonelist_order
default
/proc/sys/vm/oom_dump_tasks
1
/proc/sys/vm/oom_kill_allocating_task
0
/proc/sys/vm/overcommit_kbytes
0
/proc/sys/vm/overcommit_memory
2
/proc/sys/vm/overcommit_ratio
80
/proc/sys/vm/page-cluster
3
/proc/sys/vm/panic_on_oom
0
/proc/sys/vm/percpu_pagelist_fraction
0
/proc/sys/vm/stat_interval
1
/proc/sys/vm/stat_refresh
/proc/sys/vm/swappiness
10
/proc/sys/vm/user_reserve_kbytes
31036
/proc/sys/vm/vfs_cache_pressure
100
/proc/sys/vm/watermark_scale_factor
10
/proc/sys/vm/zone_reclaim_mode
0

Thnx.


Ciao,

Gerhard


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Re: Still OOM problems with 4.9er/4.10er kernels

[Gerhard Wiesinger]

On 17.03.2017 21:08, Gerhard Wiesinger wrote:
> On 17.03.2017 18:13, Michal Hocko wrote:
>> On Fri 17-03-17 17:37:48, Gerhard Wiesinger wrote:
>> [...] 

4.11.0-0.rc2.git4.1.fc27.x86_64

There are also lockups after some runtime hours to 1 day:
Message from syslogd@myserver Mar 19 08:22:33 ...
  kernel:BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 
stuck for 18717s!

Message from syslogd@myserver at Mar 19 08:22:33 ...
  kernel:BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 
stuck for 18078s!

repeated a lot of times ....

Ciao,
Gerhard

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Re: Still OOM problems with 4.9er/4.10er kernels

[Tetsuo Handa]

On 2017/03/19 17:17, Gerhard Wiesinger wrote:
> On 17.03.2017 21:08, Gerhard Wiesinger wrote:
>> On 17.03.2017 18:13, Michal Hocko wrote:
>>> On Fri 17-03-17 17:37:48, Gerhard Wiesinger wrote:
>>> [...] 
> 
> 4.11.0-0.rc2.git4.1.fc27.x86_64
> 
> There are also lockups after some runtime hours to 1 day:
> Message from syslogd@myserver Mar 19 08:22:33 ...
>  kernel:BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 18717s!
> 
> Message from syslogd@myserver at Mar 19 08:22:33 ...
>  kernel:BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 18078s!
> 
> repeated a lot of times ....
> 
> Ciao,
> Gerhard

"kernel:BUG: workqueue lockup" lines alone do not help. It does not tell what work is
stalling. Maybe stalling due to constant swapping while doing memory allocation when
processing some work, but relevant lines are needed in order to know what is happening.
You can try SysRq-t to dump what workqueue threads are doing when you encounter such lines.

You might want to try kmallocwd at
http://lkml.kernel.org/r/1489578541-81526-1-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp .

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Re: Still OOM problems with 4.9er/4.10er kernels

[Michal Hocko]

On Fri 17-03-17 21:08:31, Gerhard Wiesinger wrote:
> On 17.03.2017 18:13, Michal Hocko wrote:
> >On Fri 17-03-17 17:37:48, Gerhard Wiesinger wrote:
> >[...]
> >>Why does the kernel prefer to swapin/out and not use
> >>
> >>a.) the free memory?
> >It will use all the free memory up to min watermark which is set up
> >based on min_free_kbytes.
> 
> Makes sense, how is /proc/sys/vm/min_free_kbytes default value calculated?

See init_per_zone_wmark_min

> >>b.) the buffer/cache?
> >the memory reclaim is strongly biased towards page cache and we try to
> >avoid swapout as much as possible (see get_scan_count).
> 
> If I understand it correctly, swapping is preferred over dropping the
> cache, right. Can this behaviour be changed to prefer dropping the
> cache to some minimum amount?  Is this also configurable in a way?

No, we enforce swapping if the amount of free + file pages are below the
cumulative high watermark.

> (As far as I remember e.g. kernel 2.4 dropped the caches well).
> 
> >>There is ~100M memory available but kernel swaps all the time ...
> >>
> >>Any ideas?
> >>
> >>Kernel: 4.9.14-200.fc25.x86_64
> >>
> >>top - 17:33:43 up 28 min,  3 users,  load average: 3.58, 1.67, 0.89
> >>Tasks: 145 total,   4 running, 141 sleeping,   0 stopped,   0 zombie
> >>%Cpu(s): 19.1 us, 56.2 sy,  0.0 ni,  4.3 id, 13.4 wa, 2.0 hi,  0.3 si,  4.7
> >>st
> >>KiB Mem :   230076 total,    61508 free,   123472 used,    45096 buff/cache
> >>
> >>procs -----------memory---------- ---swap-- -----io---- -system--
> >>------cpu-----
> >>  r  b   swpd   free   buff  cache   si   so    bi    bo in   cs us sy id wa st
> >>  3  5 303916  60372    328  43864 27828  200 41420   236 6984 11138 11 47  6 23 14
> >I am really surprised to see any reclaim at all. 26% of free memory
> >doesn't sound as if we should do a reclaim at all. Do you have an
> >unusual configuration of /proc/sys/vm/min_free_kbytes ? Or is there
> >anything running inside a memory cgroup with a small limit?
> 
> nothing special set regarding /proc/sys/vm/min_free_kbytes (default values),
> detailed config below. Regarding cgroups, none of I know. How to check (I
> guess nothing is set because cg* commands are not available)?

be careful because systemd started to use some controllers. You can
easily check cgroup mount points.

> /proc/sys/vm/min_free_kbytes
> 45056

So at least 45M will be kept reserved for the system. Your data
indicated you had more memory. How does /proc/zoneinfo look like?
Btw. you seem to be using fc kernel, are there any patches applied on
top of Linus tree? Could you try to retest vanilla kernel?
-- 
Michal Hocko
SUSE Labs

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Re: Still OOM problems with 4.9er/4.10er kernels

[Gerhard Wiesinger]

On 19.03.2017 16:18, Michal Hocko wrote:
> On Fri 17-03-17 21:08:31, Gerhard Wiesinger wrote:
>> On 17.03.2017 18:13, Michal Hocko wrote:
>>> On Fri 17-03-17 17:37:48, Gerhard Wiesinger wrote:
>>> [...]
>>>> Why does the kernel prefer to swapin/out and not use
>>>>
>>>> a.) the free memory?
>>> It will use all the free memory up to min watermark which is set up
>>> based on min_free_kbytes.
>> Makes sense, how is /proc/sys/vm/min_free_kbytes default value calculated?
> See init_per_zone_wmark_min
>
>>>> b.) the buffer/cache?
>>> the memory reclaim is strongly biased towards page cache and we try to
>>> avoid swapout as much as possible (see get_scan_count).
>> If I understand it correctly, swapping is preferred over dropping the
>> cache, right. Can this behaviour be changed to prefer dropping the
>> cache to some minimum amount?  Is this also configurable in a way?
> No, we enforce swapping if the amount of free + file pages are below the
> cumulative high watermark.
>
>> (As far as I remember e.g. kernel 2.4 dropped the caches well).
>>
>>>> There is ~100M memory available but kernel swaps all the time ...
>>>>
>>>> Any ideas?
>>>>
>>>> Kernel: 4.9.14-200.fc25.x86_64
>>>>
>>>> top - 17:33:43 up 28 min,  3 users,  load average: 3.58, 1.67, 0.89
>>>> Tasks: 145 total,   4 running, 141 sleeping,   0 stopped,   0 zombie
>>>> %Cpu(s): 19.1 us, 56.2 sy,  0.0 ni,  4.3 id, 13.4 wa, 2.0 hi,  0.3 si,  4.7
>>>> st
>>>> KiB Mem :   230076 total,    61508 free,   123472 used,    45096 buff/cache
>>>>
>>>> procs -----------memory---------- ---swap-- -----io---- -system--
>>>> ------cpu-----
>>>>   r  b   swpd   free   buff  cache   si   so    bi    bo in   cs us sy id wa st
>>>>   3  5 303916  60372    328  43864 27828  200 41420   236 6984 11138 11 47  6 23 14
>>> I am really surprised to see any reclaim at all. 26% of free memory
>>> doesn't sound as if we should do a reclaim at all. Do you have an
>>> unusual configuration of /proc/sys/vm/min_free_kbytes ? Or is there
>>> anything running inside a memory cgroup with a small limit?
>> nothing special set regarding /proc/sys/vm/min_free_kbytes (default values),
>> detailed config below. Regarding cgroups, none of I know. How to check (I
>> guess nothing is set because cg* commands are not available)?
> be careful because systemd started to use some controllers. You can
> easily check cgroup mount points.

See below.

>
>> /proc/sys/vm/min_free_kbytes
>> 45056
> So at least 45M will be kept reserved for the system. Your data
> indicated you had more memory. How does /proc/zoneinfo look like?
> Btw. you seem to be using fc kernel, are there any patches applied on
> top of Linus tree? Could you try to retest vanilla kernel?


System looks normally now, FYI (e.g. now permanent swapping)


free
               total        used        free      shared buff/cache   
available
Mem:         349076      154112       41560         184 153404      148716
Swap:       2064380      831844     1232536

cat /proc/zoneinfo

Node 0, zone      DMA
   per-node stats
       nr_inactive_anon 9543
       nr_active_anon 22105
       nr_inactive_file 9877
       nr_active_file 13416
       nr_unevictable 0
       nr_isolated_anon 0
       nr_isolated_file 0
       nr_pages_scanned 0
       workingset_refault 1926013
       workingset_activate 707166
       workingset_nodereclaim 187276
       nr_anon_pages 11429
       nr_mapped    6852
       nr_file_pages 46772
       nr_dirty     1
       nr_writeback 0
       nr_writeback_temp 0
       nr_shmem     46
       nr_shmem_hugepages 0
       nr_shmem_pmdmapped 0
       nr_anon_transparent_hugepages 0
       nr_unstable  0
       nr_vmscan_write 3319047
       nr_vmscan_immediate_reclaim 32363
       nr_dirtied   222115
       nr_written   3537529
   pages free     3110
         min      27
         low      33
         high     39
    node_scanned  0
         spanned  4095
         present  3998
         managed  3977
       nr_free_pages 3110
       nr_zone_inactive_anon 18
       nr_zone_active_anon 3
       nr_zone_inactive_file 51
       nr_zone_active_file 75
       nr_zone_unevictable 0
       nr_zone_write_pending 0
       nr_mlock     0
       nr_slab_reclaimable 214
       nr_slab_unreclaimable 289
       nr_page_table_pages 185
       nr_kernel_stack 16
       nr_bounce    0
       nr_zspages   0
       numa_hit     1214071
       numa_miss    0
       numa_foreign 0
       numa_interleave 0
       numa_local   1214071
       numa_other   0
       nr_free_cma  0
         protection: (0, 306, 306, 306, 306)
   pagesets
     cpu: 0
               count: 0
               high:  0
               batch: 1
   vm stats threshold: 4
     cpu: 1
               count: 0
               high:  0
               batch: 1
   vm stats threshold: 4
   node_unreclaimable:  0
   start_pfn:           1
   node_inactive_ratio: 0
Node 0, zone    DMA32
   pages free     7921
         min      546
         low      682
         high     818
    node_scanned  0
         spanned  94172
         present  94172
         managed  83292
       nr_free_pages 7921
       nr_zone_inactive_anon 9525
       nr_zone_active_anon 22102
       nr_zone_inactive_file 9826
       nr_zone_active_file 13341
       nr_zone_unevictable 0
       nr_zone_write_pending 1
       nr_mlock     0
       nr_slab_reclaimable 5829
       nr_slab_unreclaimable 8622
       nr_page_table_pages 2638
       nr_kernel_stack 2208
       nr_bounce    0
       nr_zspages   0
       numa_hit     23125334
       numa_miss    0
       numa_foreign 0
       numa_interleave 14307
       numa_local   23125334
       numa_other   0
       nr_free_cma  0
         protection: (0, 0, 0, 0, 0)
   pagesets
     cpu: 0
               count: 17
               high:  90
               batch: 15
   vm stats threshold: 12
     cpu: 1
               count: 55
               high:  90
               batch: 15
   vm stats threshold: 12
   node_unreclaimable:  0
   start_pfn:           4096
   node_inactive_ratio: 0

mount | grep cgroup
tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,mode=755)
cgroup on /sys/fs/cgroup/systemd type cgroup 
(rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd)
cgroup on /sys/fs/cgroup/blkio type cgroup 
(rw,nosuid,nodev,noexec,relatime,blkio)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup 
(rw,nosuid,nodev,noexec,relatime,cpu,cpuacct)
cgroup on /sys/fs/cgroup/cpuset type cgroup 
(rw,nosuid,nodev,noexec,relatime,cpuset)
cgroup on /sys/fs/cgroup/net_cls,net_prio type cgroup 
(rw,nosuid,nodev,noexec,relatime,net_cls,net_prio)
cgroup on /sys/fs/cgroup/hugetlb type cgroup 
(rw,nosuid,nodev,noexec,relatime,hugetlb)
cgroup on /sys/fs/cgroup/pids type cgroup 
(rw,nosuid,nodev,noexec,relatime,pids)
cgroup on /sys/fs/cgroup/memory type cgroup 
(rw,nosuid,nodev,noexec,relatime,memory)
cgroup on /sys/fs/cgroup/perf_event type cgroup 
(rw,nosuid,nodev,noexec,relatime,perf_event)
cgroup on /sys/fs/cgroup/devices type cgroup 
(rw,nosuid,nodev,noexec,relatime,devices)
cgroup on /sys/fs/cgroup/freezer type cgroup 
(rw,nosuid,nodev,noexec,relatime,freezer)

There are patches (see below), but as far as I saw nothing regarding the 
issues which happen.


BTW: Does it make sense to reduce lower limit for low mem VMs? e.g.

echo "10000" > /proc/sys/vm/min_free_kbytes


Thnx.

Ciao,

Gerhard

https://koji.fedoraproject.org/koji/buildinfo?buildID=870215

## Patches needed for building this package

# build tweak for build ID magic, even for -vanilla
Patch001: kbuild-AFTER_LINK.patch

## compile fixes

# ongoing complaint, full discussion delayed until ksummit/plumbers
Patch002: 0001-iio-Use-event-header-from-kernel-tree.patch

%if !%{nopatches}

# Git trees.

# Standalone patches

# a tempory patch for QCOM hardware enablement. Will be gone by end of 
2016/F-26 GA
Patch420: qcom-QDF2432-tmp-errata.patch

# http://www.spinics.net/lists/arm-kernel/msg490981.html
Patch421: geekbox-v4-device-tree-support.patch

# http://www.spinics.net/lists/linux-tegra/msg26029.html
Patch422: usb-phy-tegra-Add-38.4MHz-clock-table-entry.patch

# Fix OMAP4 (pandaboard)
Patch423: arm-revert-mmc-omap_hsmmc-Use-dma_request_chan-for-reque.patch

# Not particularly happy we don't yet have a proper upstream resolution 
this is the right direction
# https://www.spinics.net/lists/arm-kernel/msg535191.html
Patch424: arm64-mm-Fix-memmap-to-be-initialized-for-the-entire-section.patch

# http://patchwork.ozlabs.org/patch/587554/
Patch425: ARM-tegra-usb-no-reset.patch

Patch426: AllWinner-net-emac.patch

# http://www.spinics.net/lists/devicetree/msg163238.html
Patch430: bcm2837-initial-support.patch

# http://www.spinics.net/lists/dri-devel/msg132235.html
Patch433: 
drm-vc4-Fix-OOPSes-from-trying-to-cache-a-partially-constructed-BO..patch

# bcm283x mmc for wifi 
http://www.spinics.net/lists/arm-kernel/msg567077.html
Patch434: bcm283x-mmc-bcm2835.patch

# Upstream fixes for i2c/serial/ethernet MAC addresses
Patch435: bcm283x-fixes.patch

# https://lists.freedesktop.org/archives/dri-devel/2017-February/133823.html
Patch436: vc4-fix-vblank-cursor-update-issue.patch

# http://www.spinics.net/lists/arm-kernel/msg552554.html
Patch438: arm-imx6-hummingboard2.patch

Patch460: lib-cpumask-Make-CPUMASK_OFFSTACK-usable-without-deb.patch

Patch466: input-kill-stupid-messages.patch

Patch467: die-floppy-die.patch

Patch468: no-pcspkr-modalias.patch

Patch470: silence-fbcon-logo.patch

Patch471: Kbuild-Add-an-option-to-enable-GCC-VTA.patch

Patch472: crash-driver.patch

Patch473: efi-lockdown.patch

Patch487: Add-EFI-signature-data-types.patch

Patch488: Add-an-EFI-signature-blob-parser-and-key-loader.patch

# This doesn't apply. It seems like it could be replaced by
# 
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=5ac7eace2d00eab5ae0e9fdee63e38aee6001f7c
# which has an explicit line about blacklisting
Patch489: KEYS-Add-a-system-blacklist-keyring.patch

Patch490: MODSIGN-Import-certificates-from-UEFI-Secure-Boot.patch

Patch491: MODSIGN-Support-not-importing-certs-from-db.patch

Patch493: drm-i915-hush-check-crtc-state.patch

Patch494: disable-i8042-check-on-apple-mac.patch

Patch495: lis3-improve-handling-of-null-rate.patch

Patch497: scsi-sd_revalidate_disk-prevent-NULL-ptr-deref.patch

Patch498: criu-no-expert.patch

Patch499: ath9k-rx-dma-stop-check.patch

Patch500: xen-pciback-Don-t-disable-PCI_COMMAND-on-PCI-device-.patch

Patch501: Input-synaptics-pin-3-touches-when-the-firmware-repo.patch

Patch502: firmware-Drop-WARN-from-usermodehelper_read_trylock-.patch

# Patch503: drm-i915-turn-off-wc-mmaps.patch

Patch509: MODSIGN-Don-t-try-secure-boot-if-EFI-runtime-is-disa.patch

#CVE-2016-3134 rhbz 1317383 1317384
Patch665: netfilter-x_tables-deal-with-bogus-nextoffset-values.patch

# grabbed from mailing list
Patch667: 
v3-Revert-tty-serial-pl011-add-ttyAMA-for-matching-pl011-console.patch

# END OF PATCH DEFINITIONS

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Re: Still OOM problems with 4.9er/4.10er kernels

[Mike Galbraith]

On Sun, 2017-03-19 at 17:02 +0100, Gerhard Wiesinger wrote:

> mount | grep cgroup

Just because controllers are mounted doesn't mean they're populated. To
check that, you want to look for directories under the mount points
with a non-empty 'tasks'.  You will find some, but memory cgroup
assignments would likely be most interesting for this thread.  You can
eliminate any diddling there by booting with cgroup_disable=memory.

	-Mike

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Re: Still OOM problems with 4.9er/4.10er kernels

[Gerhard Wiesinger]

On 20.03.2017 04:05, Mike Galbraith wrote:
> On Sun, 2017-03-19 at 17:02 +0100, Gerhard Wiesinger wrote:
>
>> mount | grep cgroup
> Just because controllers are mounted doesn't mean they're populated. To
> check that, you want to look for directories under the mount points
> with a non-empty 'tasks'.  You will find some, but memory cgroup
> assignments would likely be most interesting for this thread.  You can
> eliminate any diddling there by booting with cgroup_disable=memory.
>

Is this the correct information?

mount | grep "type cgroup" | cut -f 3 -d ' ' | while read LINE; do echo 
"================================================================================================================================================================";echo 
${LINE};ls -l ${LINE}; done
================================================================================================================================================================
/sys/fs/cgroup/systemd
total 0
-rw-r--r--  1 root root 0 Mar 20 14:31 cgroup.clone_children
-rw-r--r--  1 root root 0 Mar 20 14:31 cgroup.procs
-r--r--r--  1 root root 0 Mar 20 14:31 cgroup.sane_behavior
drwxr-xr-x  2 root root 0 Mar 20 14:31 init.scope
-rw-r--r--  1 root root 0 Mar 20 14:31 notify_on_release
-rw-r--r--  1 root root 0 Mar 20 14:31 release_agent
drwxr-xr-x 60 root root 0 Mar 21 06:50 system.slice
-rw-r--r--  1 root root 0 Mar 20 14:31 tasks
drwxr-xr-x  4 root root 0 Mar 21 06:55 user.slice
================================================================================================================================================================
/sys/fs/cgroup/net_cls,net_prio
total 0
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.clone_children
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.procs
-r--r--r-- 1 root root 0 Mar 20 14:31 cgroup.sane_behavior
-rw-r--r-- 1 root root 0 Mar 20 14:31 net_cls.classid
-rw-r--r-- 1 root root 0 Mar 20 14:31 net_prio.ifpriomap
-r--r--r-- 1 root root 0 Mar 20 14:31 net_prio.prioidx
-rw-r--r-- 1 root root 0 Mar 20 14:31 notify_on_release
-rw-r--r-- 1 root root 0 Mar 20 14:31 release_agent
-rw-r--r-- 1 root root 0 Mar 20 14:31 tasks
================================================================================================================================================================
/sys/fs/cgroup/cpu,cpuacct
total 0
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.clone_children
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.procs
-r--r--r-- 1 root root 0 Mar 20 14:31 cgroup.sane_behavior
-r--r--r-- 1 root root 0 Mar 20 14:31 cpuacct.stat
-rw-r--r-- 1 root root 0 Mar 20 14:31 cpuacct.usage
-r--r--r-- 1 root root 0 Mar 20 14:31 cpuacct.usage_all
-r--r--r-- 1 root root 0 Mar 20 14:31 cpuacct.usage_percpu
-r--r--r-- 1 root root 0 Mar 20 14:31 cpuacct.usage_percpu_sys
-r--r--r-- 1 root root 0 Mar 20 14:31 cpuacct.usage_percpu_user
-r--r--r-- 1 root root 0 Mar 20 14:31 cpuacct.usage_sys
-r--r--r-- 1 root root 0 Mar 20 14:31 cpuacct.usage_user
-rw-r--r-- 1 root root 0 Mar 20 14:31 cpu.cfs_period_us
-rw-r--r-- 1 root root 0 Mar 20 14:31 cpu.cfs_quota_us
-rw-r--r-- 1 root root 0 Mar 20 14:31 cpu.shares
-r--r--r-- 1 root root 0 Mar 20 14:31 cpu.stat
drwxr-xr-x 2 root root 0 Mar 20 14:31 init.scope
-rw-r--r-- 1 root root 0 Mar 20 14:31 notify_on_release
-rw-r--r-- 1 root root 0 Mar 20 14:31 release_agent
drwxr-xr-x 2 root root 0 Mar 20 14:31 system.slice
-rw-r--r-- 1 root root 0 Mar 20 14:31 tasks
drwxr-xr-x 4 root root 0 Mar 21 06:55 user.slice
================================================================================================================================================================
/sys/fs/cgroup/devices
total 0
-rw-r--r--  1 root root 0 Mar 20 14:31 cgroup.clone_children
-rw-r--r--  1 root root 0 Mar 20 14:31 cgroup.procs
-r--r--r--  1 root root 0 Mar 20 14:31 cgroup.sane_behavior
--w-------  1 root root 0 Mar 20 14:31 devices.allow
--w-------  1 root root 0 Mar 20 14:31 devices.deny
-r--r--r--  1 root root 0 Mar 20 14:31 devices.list
drwxr-xr-x  2 root root 0 Mar 20 14:31 init.scope
-rw-r--r--  1 root root 0 Mar 20 14:31 notify_on_release
-rw-r--r--  1 root root 0 Mar 20 14:31 release_agent
drwxr-xr-x 60 root root 0 Mar 21 06:50 system.slice
-rw-r--r--  1 root root 0 Mar 20 14:31 tasks
drwxr-xr-x  4 root root 0 Mar 21 06:55 user.slice
================================================================================================================================================================
/sys/fs/cgroup/freezer
total 0
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.clone_children
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.procs
-r--r--r-- 1 root root 0 Mar 20 14:31 cgroup.sane_behavior
-rw-r--r-- 1 root root 0 Mar 20 14:31 notify_on_release
-rw-r--r-- 1 root root 0 Mar 20 14:31 release_agent
-rw-r--r-- 1 root root 0 Mar 20 14:31 tasks
================================================================================================================================================================
/sys/fs/cgroup/perf_event
total 0
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.clone_children
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.procs
-r--r--r-- 1 root root 0 Mar 20 14:31 cgroup.sane_behavior
-rw-r--r-- 1 root root 0 Mar 20 14:31 notify_on_release
-rw-r--r-- 1 root root 0 Mar 20 14:31 release_agent
-rw-r--r-- 1 root root 0 Mar 20 14:31 tasks
================================================================================================================================================================
/sys/fs/cgroup/cpuset
total 0
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.clone_children
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.procs
-r--r--r-- 1 root root 0 Mar 20 14:31 cgroup.sane_behavior
-rw-r--r-- 1 root root 0 Mar 20 14:31 cpuset.cpu_exclusive
-rw-r--r-- 1 root root 0 Mar 20 14:31 cpuset.cpus
-r--r--r-- 1 root root 0 Mar 20 14:31 cpuset.effective_cpus
-r--r--r-- 1 root root 0 Mar 20 14:31 cpuset.effective_mems
-rw-r--r-- 1 root root 0 Mar 20 14:31 cpuset.mem_exclusive
-rw-r--r-- 1 root root 0 Mar 20 14:31 cpuset.mem_hardwall
-rw-r--r-- 1 root root 0 Mar 20 14:31 cpuset.memory_migrate
-r--r--r-- 1 root root 0 Mar 20 14:31 cpuset.memory_pressure
-rw-r--r-- 1 root root 0 Mar 20 14:31 cpuset.memory_pressure_enabled
-rw-r--r-- 1 root root 0 Mar 20 14:31 cpuset.memory_spread_page
-rw-r--r-- 1 root root 0 Mar 20 14:31 cpuset.memory_spread_slab
-rw-r--r-- 1 root root 0 Mar 20 14:31 cpuset.mems
-rw-r--r-- 1 root root 0 Mar 20 14:31 cpuset.sched_load_balance
-rw-r--r-- 1 root root 0 Mar 20 14:31 cpuset.sched_relax_domain_level
-rw-r--r-- 1 root root 0 Mar 20 14:31 notify_on_release
-rw-r--r-- 1 root root 0 Mar 20 14:31 release_agent
-rw-r--r-- 1 root root 0 Mar 20 14:31 tasks
================================================================================================================================================================
/sys/fs/cgroup/memory
total 0
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.clone_children
--w--w--w- 1 root root 0 Mar 20 14:31 cgroup.event_control
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.procs
-r--r--r-- 1 root root 0 Mar 20 14:31 cgroup.sane_behavior
drwxr-xr-x 2 root root 0 Mar 20 14:31 init.scope
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.failcnt
--w------- 1 root root 0 Mar 20 14:31 memory.force_empty
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.kmem.failcnt
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.kmem.limit_in_bytes
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.kmem.max_usage_in_bytes
-r--r--r-- 1 root root 0 Mar 20 14:31 memory.kmem.slabinfo
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.kmem.tcp.failcnt
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.kmem.tcp.limit_in_bytes
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.kmem.tcp.max_usage_in_bytes
-r--r--r-- 1 root root 0 Mar 20 14:31 memory.kmem.tcp.usage_in_bytes
-r--r--r-- 1 root root 0 Mar 20 14:31 memory.kmem.usage_in_bytes
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.limit_in_bytes
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.max_usage_in_bytes
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.memsw.failcnt
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.memsw.limit_in_bytes
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.memsw.max_usage_in_bytes
-r--r--r-- 1 root root 0 Mar 20 14:31 memory.memsw.usage_in_bytes
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.move_charge_at_immigrate
-r--r--r-- 1 root root 0 Mar 20 14:31 memory.numa_stat
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.oom_control
---------- 1 root root 0 Mar 20 14:31 memory.pressure_level
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.soft_limit_in_bytes
-r--r--r-- 1 root root 0 Mar 20 14:31 memory.stat
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.swappiness
-r--r--r-- 1 root root 0 Mar 20 14:31 memory.usage_in_bytes
-rw-r--r-- 1 root root 0 Mar 20 14:31 memory.use_hierarchy
-rw-r--r-- 1 root root 0 Mar 20 14:31 notify_on_release
-rw-r--r-- 1 root root 0 Mar 20 14:31 release_agent
drwxr-xr-x 2 root root 0 Mar 20 14:31 system.slice
-rw-r--r-- 1 root root 0 Mar 20 14:31 tasks
drwxr-xr-x 4 root root 0 Mar 21 06:55 user.slice
================================================================================================================================================================
/sys/fs/cgroup/pids
total 0
-rw-r--r--  1 root root 0 Mar 20 14:31 cgroup.clone_children
-rw-r--r--  1 root root 0 Mar 20 14:31 cgroup.procs
-r--r--r--  1 root root 0 Mar 20 14:31 cgroup.sane_behavior
drwxr-xr-x  2 root root 0 Mar 20 14:31 init.scope
-rw-r--r--  1 root root 0 Mar 20 14:31 notify_on_release
-rw-r--r--  1 root root 0 Mar 20 14:31 release_agent
drwxr-xr-x 60 root root 0 Mar 21 06:50 system.slice
-rw-r--r--  1 root root 0 Mar 20 14:31 tasks
drwxr-xr-x  4 root root 0 Mar 21 06:55 user.slice
================================================================================================================================================================
/sys/fs/cgroup/hugetlb
total 0
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.clone_children
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.procs
-r--r--r-- 1 root root 0 Mar 20 14:31 cgroup.sane_behavior
-rw-r--r-- 1 root root 0 Mar 20 14:31 hugetlb.2MB.failcnt
-rw-r--r-- 1 root root 0 Mar 20 14:31 hugetlb.2MB.limit_in_bytes
-rw-r--r-- 1 root root 0 Mar 20 14:31 hugetlb.2MB.max_usage_in_bytes
-r--r--r-- 1 root root 0 Mar 20 14:31 hugetlb.2MB.usage_in_bytes
-rw-r--r-- 1 root root 0 Mar 20 14:31 notify_on_release
-rw-r--r-- 1 root root 0 Mar 20 14:31 release_agent
-rw-r--r-- 1 root root 0 Mar 20 14:31 tasks
================================================================================================================================================================
/sys/fs/cgroup/blkio
total 0
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.avg_queue_size
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.dequeue
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.empty_time
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.group_wait_time
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.idle_time
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.io_merged
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.io_merged_recursive
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.io_queued
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.io_queued_recursive
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.io_service_bytes
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.io_service_bytes_recursive
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.io_serviced
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.io_serviced_recursive
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.io_service_time
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.io_service_time_recursive
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.io_wait_time
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.io_wait_time_recursive
-rw-r--r-- 1 root root 0 Mar 20 14:31 blkio.leaf_weight
-rw-r--r-- 1 root root 0 Mar 20 14:31 blkio.leaf_weight_device
--w------- 1 root root 0 Mar 20 14:31 blkio.reset_stats
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.sectors
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.sectors_recursive
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.throttle.io_service_bytes
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.throttle.io_serviced
-rw-r--r-- 1 root root 0 Mar 20 14:31 blkio.throttle.read_bps_device
-rw-r--r-- 1 root root 0 Mar 20 14:31 blkio.throttle.read_iops_device
-rw-r--r-- 1 root root 0 Mar 20 14:31 blkio.throttle.write_bps_device
-rw-r--r-- 1 root root 0 Mar 20 14:31 blkio.throttle.write_iops_device
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.time
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.time_recursive
-r--r--r-- 1 root root 0 Mar 20 14:31 blkio.unaccounted_time
-rw-r--r-- 1 root root 0 Mar 20 14:31 blkio.weight
-rw-r--r-- 1 root root 0 Mar 20 14:31 blkio.weight_device
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.clone_children
-rw-r--r-- 1 root root 0 Mar 20 14:31 cgroup.procs
-r--r--r-- 1 root root 0 Mar 20 14:31 cgroup.sane_behavior
drwxr-xr-x 2 root root 0 Mar 20 14:31 init.scope
-rw-r--r-- 1 root root 0 Mar 20 14:31 notify_on_release
-rw-r--r-- 1 root root 0 Mar 20 14:31 release_agent
drwxr-xr-x 2 root root 0 Mar 20 14:31 system.slice
-rw-r--r-- 1 root root 0 Mar 20 14:31 tasks
drwxr-xr-x 4 root root 0 Mar 21 06:55 user.slice


Thnx.

Ciao,
Gerhard

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Re: Still OOM problems with 4.9er/4.10er kernels

[Mike Galbraith]

On Tue, 2017-03-21 at 06:59 +0100, Gerhard Wiesinger wrote:

> Is this the correct information?

Incomplete, but enough to reiterate cgroup_disable=memory suggestion.

	-Mike

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Re: Still OOM problems with 4.9er/4.10er kernels

[Gerhard Wiesinger]

On 21.03.2017 08:13, Mike Galbraith wrote:
> On Tue, 2017-03-21 at 06:59 +0100, Gerhard Wiesinger wrote:
>
>> Is this the correct information?
> Incomplete, but enough to reiterate cgroup_disable=memory suggestion.
>

How to collect complete information?

Thnx.

Ciao,
Gerhard

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Re: Still OOM problems with 4.9er/4.10er kernels

[Mike Galbraith]

On Thu, 2017-03-23 at 08:16 +0100, Gerhard Wiesinger wrote:
> On 21.03.2017 08:13, Mike Galbraith wrote:
> > On Tue, 2017-03-21 at 06:59 +0100, Gerhard Wiesinger wrote:
> > 
> > > Is this the correct information?
> > Incomplete, but enough to reiterate cgroup_disable=memory
> > suggestion.
> > 
> 
> How to collect complete information?

If Michal wants specifics, I suspect he'll ask.  I posted only to pass
along a speck of information, and offer a test suggestion.. twice.

	-Mike

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Re: Still OOM problems with 4.9er/4.10er kernels

[Tetsuo Handa]

On 2017/03/23 17:38, Mike Galbraith wrote:
> On Thu, 2017-03-23 at 08:16 +0100, Gerhard Wiesinger wrote:
>> On 21.03.2017 08:13, Mike Galbraith wrote:
>>> On Tue, 2017-03-21 at 06:59 +0100, Gerhard Wiesinger wrote:
>>>
>>>> Is this the correct information?
>>> Incomplete, but enough to reiterate cgroup_disable=memory
>>> suggestion.
>>>
>>
>> How to collect complete information?
> 
> If Michal wants specifics, I suspect he'll ask.  I posted only to pass
> along a speck of information, and offer a test suggestion.. twice.
> 
> 	-Mike

Isn't information Mike asked something like output from below command

  for i in `find /sys/fs/cgroup/memory/ -type f`; do echo ========== $i ==========; cat $i | xargs echo; done

and check which cgroups stalling tasks belong to? Also, Mike suggested to
reproduce your problem with cgroup_disable=memory kernel command line option
in order to bisect whether memory cgroups are related to your problem.

I don't know whether Michal already knows specific information to collect.
I think memory allocation watchdog might give us some clue. It will give us
output like http://I-love.SAKURA.ne.jp/tmp/serial-20170321.txt.xz .

Can you afford building kernels with watchdog patch applied? Steps I tried for
building kernels are shown below. (If you can't afford building but can afford
trying binary rpms, I can upload them.)

----------------------------------------
yum -y install yum-utils
wget https://dl.fedoraproject.org/pub/alt/rawhide-kernel-nodebug/SRPMS/kernel-4.11.0-0.rc3.git0.1.fc27.src.rpm
yum-builddep -y kernel-4.11.0-0.rc3.git0.1.fc27.src.rpm
rpm -ivh kernel-4.11.0-0.rc3.git0.1.fc27.src.rpm
yum-builddep -y ~/rpmbuild/SPECS/kernel.spec
patch -p1 -d ~/rpmbuild/SPECS/ << "EOF"
--- a/kernel.spec
+++ b/kernel.spec
@@ -24,7 +24,7 @@
 %global zipsed -e 's/\.ko$/\.ko.xz/'
 %endif
 
-# define buildid .local
+%define buildid .kmallocwd
 
 # baserelease defines which build revision of this kernel version we're
 # building.  We used to call this fedora_build, but the magical name
@@ -1207,6 +1207,8 @@
 
 git am %{patches}
 
+patch -p1 < $RPM_SOURCE_DIR/kmallocwd.patch
+
 # END OF PATCH APPLICATIONS
 
 # Any further pre-build tree manipulations happen here.
@@ -1243,6 +1245,8 @@
 do
   cat $i > temp-$i
   mv $i .config
+  echo 'CONFIG_DETECT_MEMALLOC_STALL_TASK=y' >> .config
+  echo 'CONFIG_DEFAULT_MEMALLOC_TASK_TIMEOUT=30' >> .config
   Arch=`head -1 .config | cut -b 3-`
   make ARCH=$Arch listnewconfig | grep -E '^CONFIG_' >.newoptions || true
 %if %{listnewconfig_fail}
EOF
wget -O ~/rpmbuild/SOURCES/kmallocwd.patch 'https://marc.info/?l=linux-mm&m=148957858821214&q=raw'
rpmbuild -bb ~/rpmbuild/SPECS/kernel.spec
----------------------------------------

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Re: Still OOM problems with 4.9er/4.10er kernels

[Gerhard Wiesinger]

On 23.03.2017 09:38, Mike Galbraith wrote:
> On Thu, 2017-03-23 at 08:16 +0100, Gerhard Wiesinger wrote:
>> On 21.03.2017 08:13, Mike Galbraith wrote:
>>> On Tue, 2017-03-21 at 06:59 +0100, Gerhard Wiesinger wrote:
>>>
>>>> Is this the correct information?
>>> Incomplete, but enough to reiterate cgroup_disable=memory
>>> suggestion.
>>>
>> How to collect complete information?
> If Michal wants specifics, I suspect he'll ask.  I posted only to pass
> along a speck of information, and offer a test suggestion.. twice.

Still OOM with cgroup_disable=memory, kernel 
4.11.0-0.rc3.git0.2.fc26.x86_64,I set vm.min_free_kbytes = 10240 in 
these tests.
# Full config
grep "vm\." /etc/sysctl.d/*
/etc/sysctl.d/00-dirty_background_ratio.conf:vm.dirty_background_ratio = 3
/etc/sysctl.d/00-dirty_ratio.conf:vm.dirty_ratio = 15
/etc/sysctl.d/00-kernel-vm-min-free-kbyzes.conf:vm.min_free_kbytes = 10240
/etc/sysctl.d/00-overcommit_memory.conf:vm.overcommit_memory = 2
/etc/sysctl.d/00-overcommit_ratio.conf:vm.overcommit_ratio = 80
/etc/sysctl.d/00-swappiness.conf:vm.swappiness=10

[31880.623557] sa1: page allocation stalls for 10942ms, order:0, 
mode:0x14200ca(GFP_HIGHUSER_MOVABLE), nodemask=(null)
[31880.623623] sa1 cpuset=/ mems_allowed=0
[31880.623630] CPU: 1 PID: 17112 Comm: sa1 Not tainted 
4.11.0-0.rc3.git0.2.fc26.x86_64 #1
[31880.623724] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), 
BIOS 1.9.3 04/01/2014
[31880.623819] Call Trace:
[31880.623893]  dump_stack+0x63/0x84
[31880.623971]  warn_alloc+0x10c/0x1b0
[31880.624046]  __alloc_pages_slowpath+0x93d/0xe60
[31880.624142]  ? get_page_from_freelist+0x122/0xbf0
[31880.624225]  ? unmap_region+0xf7/0x130
[31880.624312]  __alloc_pages_nodemask+0x290/0x2b0
[31880.624388]  alloc_pages_vma+0xa0/0x2b0
[31880.624463]  __handle_mm_fault+0x4d0/0x1160
[31880.624550]  handle_mm_fault+0xb3/0x250
[31880.624628]  __do_page_fault+0x23f/0x4c0
[31880.624701]  trace_do_page_fault+0x41/0x120
[31880.624781]  do_async_page_fault+0x51/0xa0
[31880.624866]  async_page_fault+0x28/0x30
[31880.624941] RIP: 0033:0x7f9218d4914f
[31880.625032] RSP: 002b:00007ffe0d1376a8 EFLAGS: 00010206
[31880.625153] RAX: 00007f9218d2a314 RBX: 00007f9218f4e658 RCX: 
00007f9218d2a354
[31880.625235] RDX: 00000000000005ec RSI: 0000000000000000 RDI: 
00007f9218d2a314
[31880.625324] RBP: 00007ffe0d137950 R08: 00007f9218d2a900 R09: 
0000000000027000
[31880.625423] R10: 00007ffe0d1376e0 R11: 00007f9218d2a900 R12: 
0000000000000003
[31880.625505] R13: 00007ffe0d137a38 R14: 000000000000fd01 R15: 
0000000000000002
[31880.625688] Mem-Info:
[31880.625762] active_anon:36671 inactive_anon:36711 isolated_anon:88
                 active_file:1399 inactive_file:1410 isolated_file:0
                 unevictable:0 dirty:5 writeback:15 unstable:0
                 slab_reclaimable:3099 slab_unreclaimable:3558
                 mapped:2037 shmem:3 pagetables:3340 bounce:0
                 free:2972 free_pcp:102 free_cma:0
[31880.627334] Node 0 active_anon:146684kB inactive_anon:146816kB 
active_file:5596kB inactive_file:5572kB unevictable:0kB 
isolated(anon):368kB isolated(file):0kB mapped:8044kB dirty:20kB 
writeback:136kB shmem:0kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 
12kB writeback_tmp:0kB unstable:0kB pages_scanned:82 all_unreclaimable? no
[31880.627606] Node 0 DMA free:1816kB min:440kB low:548kB high:656kB 
active_anon:5636kB inactive_anon:6844kB active_file:132kB 
inactive_file:148kB unevictable:0kB writepending:4kB present:15992kB 
managed:15908kB mlocked:0kB slab_reclaimable:284kB 
slab_unreclaimable:532kB kernel_stack:0kB pagetables:188kB bounce:0kB 
free_pcp:0kB local_pcp:0kB free_cma:0kB
[31880.627883] lowmem_reserve[]: 0 327 327 327 327
[31880.627959] Node 0 DMA32 free:10072kB min:9796kB low:12244kB 
high:14692kB active_anon:141048kB inactive_anon:140000kB 
active_file:5432kB inactive_file:5444kB unevictable:0kB 
writepending:152kB present:376688kB managed:353760kB mlocked:0kB 
slab_reclaimable:12112kB slab_unreclaimable:13700kB kernel_stack:2464kB 
pagetables:13172kB bounce:0kB free_pcp:504kB local_pcp:272kB free_cma:0kB
[31880.628334] lowmem_reserve[]: 0 0 0 0 0
[31880.629882] Node 0 DMA: 33*4kB (UME) 24*8kB (UM) 26*16kB (UME) 4*32kB 
(UME) 5*64kB (UME) 1*128kB (E) 2*256kB (M) 0*512kB 0*1024kB 0*2048kB 
0*4096kB = 1828kB
[31880.632255] Node 0 DMA32: 174*4kB (UMEH) 107*8kB (UMEH) 96*16kB 
(UMEH) 59*32kB (UME) 30*64kB (UMEH) 8*128kB (UEH) 8*256kB (UMEH) 1*512kB 
(E) 0*1024kB 0*2048kB 0*4096kB = 10480kB
[31880.634344] Node 0 hugepages_total=0 hugepages_free=0 
hugepages_surp=0 hugepages_size=2048kB
[31880.634346] 7276 total pagecache pages
[31880.635277] 4367 pages in swap cache
[31880.636206] Swap cache stats: add 5639999, delete 5635551, find 
6573228/8496821
[31880.637145] Free swap  = 973736kB
[31880.638038] Total swap = 2064380kB
[31880.638988] 98170 pages RAM
[31880.640309] 0 pages HighMem/MovableOnly
[31880.641791] 5753 pages reserved
[31880.642908] 0 pages cma reserved
[31880.643978] 0 pages hwpoisoned

Will try your suggestions with the custom build kernel.

Ciao,
Gerhard

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Re: Still OOM problems with 4.9er kernels

[Gerhard Wiesinger]

On 09.12.2016 14:40, Michal Hocko wrote:
> On Fri 09-12-16 08:06:25, Gerhard Wiesinger wrote:
>> Hello,
>>
>> same with latest kernel rc, dnf still killed with OOM (but sometimes
>> better).
>>
>> ./update.sh: line 40:  1591 Killed                  ${EXE} update ${PARAMS}
>> (does dnf clean all;dnf update)
>> Linux database.intern 4.9.0-0.rc8.git2.1.fc26.x86_64 #1 SMP Wed Dec 7
>> 17:53:29 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
>>
>> Updated bug report:
>> https://bugzilla.redhat.com/show_bug.cgi?id=1314697
> Could you post your oom report please?

And another one which ended in a native_safe_halt ....

[73366.837826] nmbd: page allocation failure: order:0, 
mode:0x2280030(GFP_ATOMIC|__GFP_RECLAIMABLE|__GFP_NOTRACK)
[73366.837985] CPU: 1 PID: 2005 Comm: nmbd Not tainted 
4.9.0-0.rc8.git2.1.fc26.x86_64 #1
[73366.838075] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), 
BIOS 1.9.3
[73366.838175]  ffffaa4ac059f548 ffffffff8d4774e3 ffffffff8dc7dd98 
0000000000000000
[73366.838272]  ffffaa4ac059f5d0 ffffffff8d20e6ea 0228003000000046 
ffffffff8dc7dd98
[73366.838364]  ffffaa4ac059f570 ffff9c3700000010 ffffaa4ac059f5e0 
ffffaa4ac059f590
[73366.838458] Call Trace:
[73366.838590]  [<ffffffff8d4774e3>] dump_stack+0x86/0xc3
[73366.838680]  [<ffffffff8d20e6ea>] warn_alloc+0x13a/0x170
[73366.838762]  [<ffffffff8d20e9e2>] __alloc_pages_slowpath+0x252/0xbb0
[73366.838846]  [<ffffffff8d0e09a0>] ? finish_task_switch+0xb0/0x260
[73366.838926]  [<ffffffff8d20f74d>] __alloc_pages_nodemask+0x40d/0x4b0
[73366.839007]  [<ffffffff8d26db51>] alloc_pages_current+0xa1/0x1f0
[73366.839088]  [<ffffffff8d068475>] ? kvm_sched_clock_read+0x25/0x40
[73366.839170]  [<ffffffff8d278956>] new_slab+0x316/0x7c0
[73366.839245]  [<ffffffff8d27ae8b>] ___slab_alloc+0x3fb/0x5c0
[73366.839325]  [<ffffffff8d068475>] ? kvm_sched_clock_read+0x25/0x40
[73366.839409]  [<ffffffff8d3a4503>] ? __es_insert_extent+0xb3/0x330
[73366.839501]  [<ffffffff8d3a4503>] ? __es_insert_extent+0xb3/0x330
[73366.839583]  [<ffffffff8d27b0a1>] __slab_alloc+0x51/0x90
[73366.839662]  [<ffffffff8d3a4503>] ? __es_insert_extent+0xb3/0x330
[73366.839743]  [<ffffffff8d27b326>] kmem_cache_alloc+0x246/0x2d0
[73366.839822]  [<ffffffff8d3a5066>] ? __es_remove_extent+0x56/0x2d0
[73366.839906]  [<ffffffff8d3a4503>] __es_insert_extent+0xb3/0x330
[73366.839985]  [<ffffffff8d3a573e>] ext4_es_insert_extent+0xee/0x280
[73366.840067]  [<ffffffff8d35a704>] ? ext4_map_blocks+0x2b4/0x5f0
[73366.840147]  [<ffffffff8d35a773>] ext4_map_blocks+0x323/0x5f0
[73366.840225]  [<ffffffff8d23dfda>] ? workingset_refault+0x10a/0x220
[73366.840314]  [<ffffffff8d3ad7d3>] ext4_mpage_readpages+0x413/0xa60
[73366.840397]  [<ffffffff8d201d96>] ? __page_cache_alloc+0x146/0x190
[73366.840487]  [<ffffffff8d358235>] ext4_readpages+0x35/0x40
[73366.840569]  [<ffffffff8d216d3f>] __do_page_cache_readahead+0x2bf/0x390
[73366.840651]  [<ffffffff8d216bea>] ? __do_page_cache_readahead+0x16a/0x390
[73366.840735]  [<ffffffff8d20622b>] filemap_fault+0x51b/0x790
[73366.840814]  [<ffffffff8d3639ce>] ? ext4_filemap_fault+0x2e/0x50
[73366.840896]  [<ffffffff8d3639d9>] ext4_filemap_fault+0x39/0x50
[73366.840976]  [<ffffffff8d241ca3>] __do_fault+0x83/0x1d0
[73366.841056]  [<ffffffff8d246642>] handle_mm_fault+0x11e2/0x17a0
[73366.841138]  [<ffffffff8d2454ba>] ? handle_mm_fault+0x5a/0x17a0
[73366.841220]  [<ffffffff8d06de16>] __do_page_fault+0x266/0x520
[73366.841300]  [<ffffffff8d06e1a8>] trace_do_page_fault+0x58/0x2a0
[73366.841382]  [<ffffffff8d067f3a>] do_async_page_fault+0x1a/0xa0
[73366.841464]  [<ffffffff8d918e28>] async_page_fault+0x28/0x30
[73366.842500] Mem-Info:
[73366.843149] active_anon:8677 inactive_anon:8798 isolated_anon:0
                 active_file:328 inactive_file:317 isolated_file:32
                 unevictable:0 dirty:0 writeback:2 unstable:0
                 slab_reclaimable:4968 slab_unreclaimable:9242
                 mapped:365 shmem:1 pagetables:2690 bounce:0
                 free:764 free_pcp:41 free_cma:0
[73366.846832] Node 0 active_anon:34708kB inactive_anon:35192kB 
active_file:1312kB inactive_file:1268kB unevictable:0kB 
isolated(anon):0kB isolated(file):128kB mapped:1460kB dirty:0kB 
writeback:8kB shmem:0kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 
4kB writeback_tmp:0kB unstable:0kB pages_scanned:32 all_unreclaimable? no
[73366.848711] Node 0 DMA free:1468kB min:172kB low:212kB high:252kB 
active_anon:3216kB inactive_anon:3448kB active_file:40kB 
inactive_file:228kB unevictable:0kB writepending:0kB present:15992kB 
managed:15908kB mlocked:0kB slab_reclaimable:2064kB 
slab_unreclaimable:2960kB kernel_stack:100kB pagetables:1536kB 
bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
[73366.850769] lowmem_reserve[]: 0 116 116 116 116
[73366.851479] Node 0 DMA32 free:1588kB min:1296kB low:1620kB 
high:1944kB active_anon:31464kB inactive_anon:31740kB active_file:1236kB 
inactive_file:1056kB unevictable:0kB writepending:0kB present:180080kB 
managed:139012kB mlocked:0kB slab_reclaimable:17808kB 
slab_unreclaimable:34008kB kernel_stack:1676kB pagetables:9224kB 
bounce:0kB free_pcp:164kB local_pcp:12kB free_cma:0kB
[73366.853757] lowmem_reserve[]: 0 0 0 0 0
[73366.854544] Node 0 DMA: 13*4kB (H) 13*8kB (H) 17*16kB (H) 12*32kB (H) 
8*64kB (H) 1*128kB (H) 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 1452kB
[73366.856200] Node 0 DMA32: 70*4kB (UMH) 12*8kB (MH) 12*16kB (H) 2*32kB 
(H) 5*64kB (H) 5*128kB (H) 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 
1592kB
[73366.857955] Node 0 hugepages_total=0 hugepages_free=0 
hugepages_surp=0 hugepages_size=2048kB
[73366.857956] 2401 total pagecache pages
[73366.858829] 1741 pages in swap cache
[73366.859721] Swap cache stats: add 1230889, delete 1229148, find 
3509739/3747264
[73366.860616] Free swap  = 2059496kB
[73366.861500] Total swap = 2097148kB
[73366.862578] 49018 pages RAM
[73366.863560] 0 pages HighMem/MovableOnly
[73366.864531] 10288 pages reserved
[73366.865436] 0 pages cma reserved
[73366.866395] 0 pages hwpoisoned
[73366.867503] SLUB: Unable to allocate memory on node -1, 
gfp=0x2080020(GFP_ATOMIC)
[73366.868507]   cache: ext4_extent_status, object size: 40, buffer 
size: 40, default order: 0, min order: 0
[73366.869508]   node 0: slabs: 13, objs: 1326, free: 0
[96351.012045] dmcrypt_write: page allocation failure: order:0, 
mode:0x2280020(GFP_ATOMIC|__GFP_NOTRACK)
[96351.024364] CPU: 0 PID: 1593 Comm: dmcrypt_write Not tainted 
4.9.0-0.rc8.git2.1.fc26.x86_64 #1
[96351.027132] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), 
BIOS 1.9.3
[96351.029537]  ffffaa4ac025b508 ffffffff8d4774e3 ffffffff8dc7dd98 
0000000000000000
[96351.033023]  ffffaa4ac025b590 ffffffff8d20e6ea 0228002000000046 
ffffffff8dc7dd98
[96351.036214]  ffffaa4ac025b530 ffff9c3700000010 ffffaa4ac025b5a0 
ffffaa4ac025b550
[96351.039266] Call Trace:
[96351.041426]  [<ffffffff8d4774e3>] dump_stack+0x86/0xc3
[96351.044511]  [<ffffffff8d20e6ea>] warn_alloc+0x13a/0x170
[96351.046698]  [<ffffffff8d20e9e2>] __alloc_pages_slowpath+0x252/0xbb0
[96351.048852]  [<ffffffff8d20f74d>] __alloc_pages_nodemask+0x40d/0x4b0
[96351.052025]  [<ffffffff8d26db51>] alloc_pages_current+0xa1/0x1f0
[96351.053975]  [<ffffffff8d916f17>] ? _raw_spin_unlock+0x27/0x40
[96351.055066]  [<ffffffff8d278956>] new_slab+0x316/0x7c0
[96351.056134]  [<ffffffff8d0ed4c7>] ? sched_clock_cpu+0xa7/0xc0
[96351.057236]  [<ffffffff8d27ae8b>] ___slab_alloc+0x3fb/0x5c0
[96351.058287]  [<ffffffff8d10b042>] ? cpuacct_charge+0xf2/0x1f0
[96351.059374]  [<ffffffffc03a650d>] ? alloc_indirect.isra.11+0x1d/0x50 
[virtio_ring]
[96351.060439]  [<ffffffffc03a650d>] ? alloc_indirect.isra.11+0x1d/0x50 
[virtio_ring]
[96351.061484]  [<ffffffff8d27b0a1>] __slab_alloc+0x51/0x90
[96351.062505]  [<ffffffff8d27d141>] __kmalloc+0x251/0x320
[96351.063619]  [<ffffffffc03a650d>] ? alloc_indirect.isra.11+0x1d/0x50 
[virtio_ring]
[96351.064624]  [<ffffffffc03a650d>] alloc_indirect.isra.11+0x1d/0x50 
[virtio_ring]
[96351.065631]  [<ffffffffc03a7193>] virtqueue_add_sgs+0x1c3/0x4a0 
[virtio_ring]
[96351.066564]  [<ffffffff8d068475>] ? kvm_sched_clock_read+0x25/0x40
[96351.067504]  [<ffffffffc041e65c>] __virtblk_add_req+0xbc/0x220 
[virtio_blk]
[96351.068425]  [<ffffffff8d1312fd>] ? debug_lockdep_rcu_enabled+0x1d/0x20
[96351.069351]  [<ffffffffc041e935>] ? virtio_queue_rq+0x105/0x290 
[virtio_blk]
[96351.070229]  [<ffffffffc041e95d>] virtio_queue_rq+0x12d/0x290 
[virtio_blk]
[96351.071059]  [<ffffffff8d45015d>] __blk_mq_run_hw_queue+0x26d/0x3b0
[96351.071904]  [<ffffffff8d44fecd>] blk_mq_run_hw_queue+0xad/0xd0
[96351.072727]  [<ffffffff8d450fca>] blk_mq_insert_requests+0x24a/0x320
[96351.073607]  [<ffffffff8d452419>] blk_mq_flush_plug_list+0x139/0x160
[96351.074397]  [<ffffffff8d4451d6>] blk_flush_plug_list+0xb6/0x250
[96351.075111]  [<ffffffff8d44586c>] blk_finish_plug+0x2c/0x40
[96351.075869]  [<ffffffffc03adef0>] dmcrypt_write+0x210/0x220 [dm_crypt]
[96351.076613]  [<ffffffff8d0e6590>] ? wake_up_q+0x80/0x80
[96351.077376]  [<ffffffffc03adce0>] ? crypt_iv_essiv_dtr+0x70/0x70 
[dm_crypt]
[96351.078086]  [<ffffffffc03adce0>] ? crypt_iv_essiv_dtr+0x70/0x70 
[dm_crypt]
[96351.078892]  [<ffffffff8d0d82c2>] kthread+0x102/0x120
[96351.079635]  [<ffffffff8d111775>] ? trace_hardirqs_on_caller+0xf5/0x1b0
[96351.080403]  [<ffffffff8d0d81c0>] ? kthread_park+0x60/0x60
[96351.081115]  [<ffffffff8d917afa>] ret_from_fork+0x2a/0x40
[96351.081882] Mem-Info:
[96351.082616] active_anon:8390 inactive_anon:8478 isolated_anon:32
                 active_file:25 inactive_file:30 isolated_file:0
                 unevictable:0 dirty:0 writeback:151 unstable:0
                 slab_reclaimable:5304 slab_unreclaimable:9678
                 mapped:24 shmem:0 pagetables:3012 bounce:0
                 free:715 free_pcp:77 free_cma:0
[96351.086909] Node 0 active_anon:33560kB inactive_anon:33912kB 
active_file:100kB inactive_file:120kB unevictable:0kB 
isolated(anon):128kB isolated(file):0kB mapped:96kB dirty:0kB 
writeback:604kB shmem:0kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 
0kB writeback_tmp:0kB unstable:0kB pages_scanned:395 all_unreclaimable? no
[96351.089052] Node 0 DMA free:1452kB min:172kB low:212kB high:252kB 
active_anon:3296kB inactive_anon:3768kB active_file:12kB 
inactive_file:0kB unevictable:0kB writepending:24kB present:15992kB 
managed:15908kB mlocked:0kB slab_reclaimable:2508kB 
slab_unreclaimable:3108kB kernel_stack:100kB pagetables:1024kB 
bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
[96351.091383] lowmem_reserve[]: 0 116 116 116 116
[96351.092155] Node 0 DMA32 free:1408kB min:1296kB low:1620kB 
high:1944kB active_anon:30264kB inactive_anon:30140kB active_file:100kB 
inactive_file:124kB unevictable:0kB writepending:580kB present:180080kB 
managed:139012kB mlocked:0kB slab_reclaimable:18708kB 
slab_unreclaimable:35604kB kernel_stack:1820kB pagetables:11024kB 
bounce:0kB free_pcp:308kB local_pcp:152kB free_cma:0kB
[96351.094895] lowmem_reserve[]: 0 0 0 0 0
[96351.095803] Node 0 DMA: 13*4kB (H) 13*8kB (H) 17*16kB (H) 12*32kB (H) 
8*64kB (H) 1*128kB (H) 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 1452kB
[96351.097708] Node 0 DMA32: 16*4kB (H) 6*8kB (H) 5*16kB (H) 8*32kB (H) 
5*64kB (H) 5*128kB (H) 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 1408kB
[96351.099672] Node 0 hugepages_total=0 hugepages_free=0 
hugepages_surp=0 hugepages_size=2048kB
[96351.099673] 5020 total pagecache pages
[96351.100659] 4961 pages in swap cache
[96351.101635] Swap cache stats: add 1422746, delete 1417785, find 
4506321/4784232
[96351.102630] Free swap  = 1987544kB
[96351.103666] Total swap = 2097148kB
[96351.104730] 49018 pages RAM
[96351.105716] 0 pages HighMem/MovableOnly
[96351.106687] 10288 pages reserved
[96351.107642] 0 pages cma reserved
[96351.108584] 0 pages hwpoisoned
[96351.109523] SLUB: Unable to allocate memory on node -1, 
gfp=0x2080020(GFP_ATOMIC)
[96351.110479]   cache: kmalloc-256, object size: 256, buffer size: 256, 
default order: 0, min order: 0
[96351.111428]   node 0: slabs: 102, objs: 1632, free: 0
[96361.915109] swapper/0: page allocation failure: order:0, 
mode:0x2280020(GFP_ATOMIC|__GFP_NOTRACK)
[96361.916235] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 
4.9.0-0.rc8.git2.1.fc26.x86_64 #1
[96361.917276] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), 
BIOS 1.9.3
[96361.918313]  ffff9c3749e03628 ffffffff8d4774e3 ffffffff8dc7dd98 
0000000000000000
[96361.919381]  ffff9c3749e036b0 ffffffff8d20e6ea 0228002000000046 
ffffffff8dc7dd98
[96361.920511]  ffff9c3749e03650 ffff9c3700000010 ffff9c3749e036c0 
ffff9c3749e03670
[96361.921551] Call Trace:
[96361.922549]  <IRQ>
[96361.922566]  [<ffffffff8d4774e3>] dump_stack+0x86/0xc3
[96361.923684]  [<ffffffff8d20e6ea>] warn_alloc+0x13a/0x170
[96361.924735]  [<ffffffff8d20e9e2>] __alloc_pages_slowpath+0x252/0xbb0
[96361.925757]  [<ffffffff8d20f74d>] __alloc_pages_nodemask+0x40d/0x4b0
[96361.926772]  [<ffffffff8d26db51>] alloc_pages_current+0xa1/0x1f0
[96361.927844]  [<ffffffff8d278956>] new_slab+0x316/0x7c0
[96361.928884]  [<ffffffff8d27ae8b>] ___slab_alloc+0x3fb/0x5c0
[96361.929874]  [<ffffffff8d79b00b>] ? __alloc_skb+0x5b/0x1e0
[96361.930854]  [<ffffffff8d037de9>] ? sched_clock+0x9/0x10
[96361.931829]  [<ffffffff8d0ed4c7>] ? sched_clock_cpu+0xa7/0xc0
[96361.932796]  [<ffffffff8d79b00b>] ? __alloc_skb+0x5b/0x1e0
[96361.933778]  [<ffffffff8d27b0a1>] __slab_alloc+0x51/0x90
[96361.934764]  [<ffffffff8d27b7c2>] kmem_cache_alloc_node+0xb2/0x310
[96361.935713]  [<ffffffff8d79b00b>] ? __alloc_skb+0x5b/0x1e0
[96361.936637]  [<ffffffff8d79b00b>] __alloc_skb+0x5b/0x1e0
[96361.937534]  [<ffffffff8d7c2a9f>] __neigh_notify+0x3f/0xd0
[96361.938407]  [<ffffffff8d7c64b9>] neigh_update+0x379/0x8b0
[96361.939251]  [<ffffffff8d0b7000>] ? __local_bh_enable_ip+0x70/0xc0
[96361.940091]  [<ffffffff8d844702>] ? udp4_ufo_fragment+0x122/0x1a0
[96361.940915]  [<ffffffff8d845ee8>] arp_process+0x2e8/0x9f0
[96361.941708]  [<ffffffff8d846745>] arp_rcv+0x135/0x300
[96361.942473]  [<ffffffff8d111ed6>] ? __lock_acquire+0x346/0x1290
[96361.943211]  [<ffffffff8d7b42cd>] ? netif_receive_skb_internal+0x6d/0x200
[96361.943942]  [<ffffffff8d7b36da>] __netif_receive_skb_core+0x23a/0xd60
[96361.944664]  [<ffffffff8d7b42d3>] ? netif_receive_skb_internal+0x73/0x200
[96361.945360]  [<ffffffff8d7b4218>] __netif_receive_skb+0x18/0x60
[96361.946045]  [<ffffffff8d7b4320>] netif_receive_skb_internal+0xc0/0x200
[96361.946693]  [<ffffffff8d7b42d3>] ? netif_receive_skb_internal+0x73/0x200
[96361.947329]  [<ffffffff8d7b628c>] napi_gro_receive+0x13c/0x200
[96361.948002]  [<ffffffffc04cb667>] virtnet_receive+0x477/0x9a0 
[virtio_net]
[96361.948690]  [<ffffffffc04cbbad>] virtnet_poll+0x1d/0x80 [virtio_net]
[96361.949323]  [<ffffffff8d7b501e>] net_rx_action+0x23e/0x470
[96361.949994]  [<ffffffff8d91a8cd>] __do_softirq+0xcd/0x4b9
[96361.950639]  [<ffffffff8d0b7e98>] irq_exit+0x108/0x110
[96361.951275]  [<ffffffff8d91a49a>] do_IRQ+0x6a/0x120
[96361.951925]  [<ffffffff8d918256>] common_interrupt+0x96/0x96
[96361.952578]  <EOI>
[96361.952589]  [<ffffffff8d916676>] ? native_safe_halt+0x6/0x10
[96361.953245]  [<ffffffff8d916235>] default_idle+0x25/0x190
[96361.953912]  [<ffffffff8d03918f>] arch_cpu_idle+0xf/0x20
[96361.954562]  [<ffffffff8d916873>] default_idle_call+0x23/0x40
[96361.955192]  [<ffffffff8d104695>] cpu_startup_entry+0x1d5/0x250
[96361.955864]  [<ffffffff8d9066b5>] rest_init+0x135/0x140
[96361.956485]  [<ffffffff8e1ca01a>] start_kernel+0x48e/0x4af
[96361.957065]  [<ffffffff8e1c9120>] ? early_idt_handler_array+0x120/0x120
[96361.957644]  [<ffffffff8e1c92ca>] x86_64_start_reservations+0x24/0x26
[96361.958212]  [<ffffffff8e1c9419>] x86_64_start_kernel+0x14d/0x170
[96361.958880] SLUB: Unable to allocate memory on node -1, 
gfp=0x2080020(GFP_ATOMIC)
[96361.959482]   cache: kmalloc-256, object size: 256, buffer size: 256, 
default order: 0, min order: 0
[96361.960073]   node 0: slabs: 124, objs: 1984, free: 0
[99301.847630] kworker/dying (27373) used greatest stack depth: 8976 
bytes left

Ciao,

Gerhard


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