* ebitmap_node ate over 40GB of memory @ 2020-04-15 12:31 郭彬 2020-04-15 13:44 ` Ondrej Mosnacek 0 siblings, 1 reply; 3+ messages in thread From: 郭彬 @ 2020-04-15 12:31 UTC (permalink / raw) To: selinux I'm running a batch of CoreOS boxes, the lsb_release is: ``` # cat /etc/lsb-release DISTRIB_ID="Container Linux by CoreOS" DISTRIB_RELEASE=2303.3.0 DISTRIB_CODENAME="Rhyolite" DISTRIB_DESCRIPTION="Container Linux by CoreOS 2303.3.0 (Rhyolite)" ``` ``` # uname -a Linux cloud-worker-25 4.19.86-coreos #1 SMP Mon Dec 2 20:13:38 -00 2019 x86_64 Intel(R) Xeon(R) CPU E5-2640 v2 @ 2.00GHz GenuineIntel GNU/Linux ``` Recently, I found my vms constently being killed due to OOM, and after digging into the problem, I finally realized that the kernel is leaking memory. Here's my slabinfo: ``` # slabtop --sort c -o Active / Total Objects (% used) : 739390584 / 740008326 (99.9%) Active / Total Slabs (% used) : 11594275 / 11594275 (100.0%) Active / Total Caches (% used) : 105 / 129 (81.4%) Active / Total Size (% used) : 47121380.33K / 47376581.93K (99.5%) Minimum / Average / Maximum Object : 0.01K / 0.06K / 8.00K OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME 734506368 734506368 100% 0.06K 11476662 64 45906648K ebitmap_node 328160 80830 24% 0.50K 10255 32 164080K kmalloc-512 69442 36292 52% 2.00K 4341 16 138912K kmalloc-2048 13148 12571 95% 7.50K 3287 4 105184K task_struct 85359 75134 88% 1.05K 2857 30 91424K ext4_inode_cache 462336 459563 99% 0.19K 11008 42 88064K cred_jar 382641 323093 84% 0.19K 9125 42 73000K dentry 251968 249625 99% 0.25K 7874 32 62992K filp 51488 41972 81% 1.00K 1609 32 51488K kmalloc-1024 78846 77530 98% 0.59K 1461 54 46752K inode_cache 69342 68580 98% 0.66K 1449 48 46368K proc_inode_cache 70000 63132 90% 0.57K 2500 28 40000K radix_tree_node 56902 56673 99% 0.69K 1237 46 39584K sock_inode_cache 57504 54982 95% 0.66K 1198 48 38336K ovl_inode 9056 9007 99% 4.00K 1132 8 36224K kmalloc-4096 31756 31756 100% 1.00K 995 32 31840K UNIX 504192 501166 99% 0.06K 7878 64 31512K anon_vma_chain 27660 27660 100% 1.06K 922 30 29504K signal_cache 336950 335179 99% 0.09K 7325 46 29300K anon_vma 26400 26400 100% 1.06K 880 30 28160K mm_struct 38042 38042 100% 0.69K 827 46 26464K files_cache 12315 12298 99% 2.06K 821 15 26272K sighand_cache 3001 3001 100% 8.00K 763 4 24416K kmalloc-8192 74336 73888 99% 0.25K 2323 32 18584K skbuff_head_cache 186102 63644 34% 0.09K 4431 42 17724K kmalloc-96 24104 22322 92% 0.69K 524 46 16768K shmem_inode_cache 527360 479425 90% 0.03K 4120 128 16480K kmalloc-32 140439 137220 97% 0.10K 3601 39 14404K buffer_head 10075 10075 100% 1.25K 403 25 12896K UDPv6 183808 158004 85% 0.06K 2872 64 11488K kmalloc-64 60102 47918 79% 0.19K 1431 42 11448K kmalloc-192 84704 84704 100% 0.12K 2647 32 10588K pid 72450 72243 99% 0.13K 2415 30 9660K kernfs_node_cache 131152 131152 100% 0.07K 2342 56 9368K Acpi-Operand 4020 4020 100% 2.12K 268 15 8576K TCP 6936 6936 100% 0.94K 204 34 6528K RAW 118320 107640 90% 0.04K 1160 102 4640K numa_policy 11340 11191 98% 0.38K 270 42 4320K mnt_cache 1750 1750 100% 2.25K 125 14 4000K TCPv6 3472 3360 96% 1.12K 124 28 3968K RAWv6 14976 14893 99% 0.25K 468 32 3744K kmalloc-256 29728 25895 87% 0.12K 929 32 3716K kmalloc-128 86190 86190 100% 0.04K 845 102 3380K pde_opener 44240 44240 100% 0.07K 790 56 3160K eventpoll_pwq 7392 7222 97% 0.38K 176 42 2816K kmem_cache 329728 329728 100% 0.01K 644 512 2576K kmalloc-8 320 300 93% 8.00K 80 4 2560K biovec-max 142080 136981 96% 0.02K 555 256 2220K kmalloc-16 13248 13248 100% 0.12K 414 32 1656K secpath_cache 6432 5952 92% 0.25K 201 32 1608K pool_workqueue 10540 10540 100% 0.12K 310 34 1240K jbd2_journal_head 2400 2400 100% 0.50K 75 32 1200K skbuff_fclone_cache 29886 29886 100% 0.04K 293 102 1172K ext4_extent_status 3672 3431 93% 0.31K 72 51 1152K nf_conntrack 17664 17472 98% 0.06K 276 64 1104K ext4_io_end 1518 1518 100% 0.69K 33 46 1056K bio-2 1344 1344 100% 0.75K 32 42 1024K task_group 256 256 100% 4.00K 32 8 1024K names_cache 1024 1024 100% 1.00K 32 32 1024K biovec-64 1632 1632 100% 0.62K 32 51 1024K dio 4352 4352 100% 0.23K 128 34 1024K tw_sock_TCPv6 1120 1120 100% 0.91K 32 35 1024K sw_flow 5292 5292 100% 0.19K 126 42 1008K proc_dir_entry 6748 6748 100% 0.14K 241 28 964K ext4_groupinfo_4k 3536 3536 100% 0.23K 104 34 832K tw_sock_TCP 286 286 100% 2.75K 26 11 832K iommu_domain 816 816 100% 0.94K 24 34 768K mqueue_inode_cache 14016 14016 100% 0.05K 192 73 768K mbcache 819 377 46% 0.81K 21 39 672K bdev_cache 24480 24480 100% 0.02K 144 170 576K avtab_node 2940 2940 100% 0.19K 70 42 560K dmaengine-unmap-16 85 85 100% 5.50K 17 5 544K net_namespace 1568 1568 100% 0.32K 32 49 512K taskstats 1696 1696 100% 0.30K 32 53 512K request_sock_TCP 8128 8128 100% 0.06K 127 64 508K kmem_cache_node 1073 1073 100% 0.43K 29 37 464K uts_namespace 3420 3360 98% 0.13K 114 30 456K dm_bufio_buffer-4 1404 1404 100% 0.30K 27 52 432K blkdev_requests 169 98 57% 2.40K 13 13 416K request_queue 3328 3328 100% 0.12K 104 32 416K scsi_sense_cache 5049 5049 100% 0.08K 99 51 396K inotify_inode_mark 23040 23040 100% 0.02K 90 256 360K selinux_file_security 10240 10240 100% 0.03K 80 128 320K fscrypt_info 1120 1120 100% 0.25K 35 32 280K dquot 1734 1734 100% 0.16K 34 51 272K sigqueue 5525 5525 100% 0.05K 65 85 260K ftrace_event_field 1280 1280 100% 0.20K 32 40 256K file_lock_cache 1088 1088 100% 0.23K 32 34 256K posix_timers_cache 1092 1092 100% 0.20K 28 39 224K ip4-frags 1564 1564 100% 0.09K 34 46 136K trace_event_file 1287 1287 100% 0.10K 33 39 132K blkdev_ioc 2336 2336 100% 0.05K 32 73 128K Acpi-Parse 4096 4096 100% 0.03K 32 128 128K avc_xperms_data 208 157 75% 0.61K 4 52 128K hugetlbfs_inode_cache 2720 2720 100% 0.05K 32 85 128K fscrypt_ctx 1024 1024 100% 0.12K 32 32 128K ext4_allocation_context 88 88 100% 0.72K 2 44 64K fat_inode_cache 30 30 100% 1.06K 1 30 32K dmaengine-unmap-128 15 15 100% 2.06K 1 15 32K dmaengine-unmap-256 16 16 100% 2.00K 1 16 32K biovec-128 1024 1024 100% 0.03K 8 128 32K dnotify_struct 8 8 100% 4.00K 1 8 32K sgpool-128 306 306 100% 0.08K 6 51 24K Acpi-State 32 32 100% 0.50K 1 32 16K dma-kmalloc-512 512 512 100% 0.02K 2 256 8K jbd2_revoke_table_s 0 0 0% 0.09K 0 42 0K dma-kmalloc-96 0 0 0% 0.19K 0 42 0K dma-kmalloc-192 0 0 0% 0.01K 0 512 0K dma-kmalloc-8 0 0 0% 0.02K 0 256 0K dma-kmalloc-16 0 0 0% 0.03K 0 128 0K dma-kmalloc-32 0 0 0% 0.06K 0 64 0K dma-kmalloc-64 0 0 0% 0.12K 0 32 0K dma-kmalloc-128 0 0 0% 0.25K 0 32 0K dma-kmalloc-256 0 0 0% 1.00K 0 32 0K dma-kmalloc-1024 0 0 0% 2.00K 0 16 0K dma-kmalloc-2048 0 0 0% 4.00K 0 8 0K dma-kmalloc-4096 0 0 0% 8.00K 0 4 0K dma-kmalloc-8192 0 0 0% 0.12K 0 34 0K iint_cache 0 0 0% 0.45K 0 35 0K user_namespace 0 0 0% 0.94K 0 34 0K PING 0 0 0% 0.31K 0 51 0K xfrm_dst_cache 0 0 0% 0.12K 0 34 0K cfq_io_cq 0 0 0% 0.30K 0 53 0K request_sock_TCPv6 0 0 0% 1.12K 0 28 0K PINGv6 0 0 0% 2.57K 0 12 0K dm_uevent 0 0 0% 3.23K 0 9 0K kcopyd_job 0 0 0% 0.04K 0 102 0K fat_cache 0 0 0% 0.21K 0 37 0K nf_conntrack_expect 0 0 0% 0.09K 0 42 0K nf_conncount_rb ``` You can see that the `ebitmap_node` is over 40GB and still growing. The only thing I can do is rebooting the OS, but there are tens of them and lots of workloads running on them, I can't just reboot whenever I want. So, I run out of options, any help? ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: ebitmap_node ate over 40GB of memory 2020-04-15 12:31 ebitmap_node ate over 40GB of memory 郭彬 @ 2020-04-15 13:44 ` Ondrej Mosnacek [not found] ` <CAEbUFv6bED87bk-bAyUoHkvRPxpP+vS0kzNUa88qZmeB=2O7YA@mail.gmail.com> 0 siblings, 1 reply; 3+ messages in thread From: Ondrej Mosnacek @ 2020-04-15 13:44 UTC (permalink / raw) To: 郭彬; +Cc: SElinux list On Wed, Apr 15, 2020 at 2:31 PM 郭彬 <anole1949@gmail.com> wrote: > I'm running a batch of CoreOS boxes, the lsb_release is: > > ``` > # cat /etc/lsb-release > DISTRIB_ID="Container Linux by CoreOS" > DISTRIB_RELEASE=2303.3.0 > DISTRIB_CODENAME="Rhyolite" > DISTRIB_DESCRIPTION="Container Linux by CoreOS 2303.3.0 (Rhyolite)" > ``` > > ``` > # uname -a > Linux cloud-worker-25 4.19.86-coreos #1 SMP Mon Dec 2 20:13:38 -00 2019 > x86_64 Intel(R) Xeon(R) CPU E5-2640 v2 @ 2.00GHz GenuineIntel GNU/Linux > ``` > Recently, I found my vms constently being killed due to OOM, and after > digging into the problem, I finally realized that the kernel is leaking > memory. > > Here's my slabinfo: > > ``` > # slabtop --sort c -o > Active / Total Objects (% used) : 739390584 / 740008326 (99.9%) > Active / Total Slabs (% used) : 11594275 / 11594275 (100.0%) > Active / Total Caches (% used) : 105 / 129 (81.4%) > Active / Total Size (% used) : 47121380.33K / 47376581.93K (99.5%) > Minimum / Average / Maximum Object : 0.01K / 0.06K / 8.00K > > OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME > 734506368 734506368 100% 0.06K 11476662 64 45906648K ebitmap_node [...] > You can see that the `ebitmap_node` is over 40GB and still growing. The > only thing I can do is rebooting the OS, but there are tens of them and > lots of workloads running on them, I can't just reboot whenever I want. > So, I run out of options, any help? Pasting in relevant comments/questions from [1]: 2. Your kernel seems to be quite behind the current upstream and is probably maintained by your distribution (seems to be derived from the 4.19 stable branch). Can you reproduce the issue on a more recent kernel (at least 5.5+)? If you can't or the recent kernel doesn't exhibit the issue, then you should report this to your distribution. 3. Was this working fine with some earlier kernel? If you can determine the last working version, then it could help us identify the cause and/or the fix. On top of that, I realized one more thing - the kernel merges the caches for objects of the same size - so any cache with object size 64 bytes will be accounted under 'ebitmap_node' here. For example, on my system there are several caches that all alias to the common 64-byte cache: # ls -l /sys/kernel/slab/ | grep -- '-> :0000064' lrwxrwxrwx. 1 root root 0 apr 15 15:26 dmaengine-unmap-2 -> :0000064 lrwxrwxrwx. 1 root root 0 apr 15 15:26 ebitmap_node -> :0000064 lrwxrwxrwx. 1 root root 0 apr 15 15:26 fanotify_event -> :0000064 lrwxrwxrwx. 1 root root 0 apr 15 15:26 io -> :0000064 lrwxrwxrwx. 1 root root 0 apr 15 15:26 iommu_iova -> :0000064 lrwxrwxrwx. 1 root root 0 apr 15 15:26 jbd2_inode -> :0000064 lrwxrwxrwx. 1 root root 0 apr 15 15:26 ksm_rmap_item -> :0000064 lrwxrwxrwx. 1 root root 0 apr 15 15:26 ksm_stable_node -> :0000064 lrwxrwxrwx. 1 root root 0 apr 15 15:26 vmap_area -> :0000064 On your kernel you might get a different list, but any of the caches you get could be the culprit, ebitmap_node is just one of the possibilities. You can disable this merging by adding "slab_nomerge" to your kernel boot command-line. That will allow you to identify which cache is really the source of the leak. [1] https://github.com/SELinuxProject/selinux/issues/220#issuecomment-613944748 -- Ondrej Mosnacek <omosnace at redhat dot com> Software Engineer, Security Technologies Red Hat, Inc. ^ permalink raw reply [flat|nested] 3+ messages in thread
[parent not found: <CAEbUFv6bED87bk-bAyUoHkvRPxpP+vS0kzNUa88qZmeB=2O7YA@mail.gmail.com>]
* Re: ebitmap_node ate over 40GB of memory [not found] ` <CAEbUFv6bED87bk-bAyUoHkvRPxpP+vS0kzNUa88qZmeB=2O7YA@mail.gmail.com> @ 2020-04-23 8:25 ` Ondrej Mosnacek 0 siblings, 0 replies; 3+ messages in thread From: Ondrej Mosnacek @ 2020-04-23 8:25 UTC (permalink / raw) To: Bin; +Cc: SElinux list On Thu, Apr 23, 2020 at 9:50 AM Bin <anole1949@gmail.com> wrote: > Dear Ondrej: > > I've added "slab_nomerge" in the kernel parameters, and after observation for couple of days, I got this: > > > Active / Total Objects (% used) : 83818306 / 84191607 (99.6%) > Active / Total Slabs (% used) : 1336293 / 1336293 (100.0%) > Active / Total Caches (% used) : 152 / 217 (70.0%) > Active / Total Size (% used) : 5828768.08K / 5996848.72K (97.2%) > Minimum / Average / Maximum Object : 0.01K / 0.07K / 23.25K > > OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME > 80253888 80253888 100% 0.06K 1253967 64 5015868K iommu_iova Well, that means the leak is caused by the "iommu_iova" kmem cache and has nothing to with SELinux. I'd try luck on the iommu mailing list: iommu@lists.linux-foundation.org > 489472 489123 99% 0.03K 3824 128 15296K kmalloc-32 > 297444 271112 91% 0.19K 7082 42 56656K dentry > 254400 252784 99% 0.06K 3975 64 15900K anon_vma_chain > 222528 39255 17% 0.50K 6954 32 111264K kmalloc-512 > 202482 201814 99% 0.19K 4821 42 38568K vm_area_struct > 200192 200192 100% 0.01K 391 512 1564K kmalloc-8 > 170528 169359 99% 0.25K 5329 32 42632K filp > 158144 153508 97% 0.06K 2471 64 9884K kmalloc-64 > 149914 149365 99% 0.09K 3259 46 13036K anon_vma > 146640 143123 97% 0.10K 3760 39 15040K buffer_head > 130368 32791 25% 0.09K 3104 42 12416K kmalloc-96 > 129752 129752 100% 0.07K 2317 56 9268K Acpi-Operand > 105468 105106 99% 0.04K 1034 102 4136K selinux_inode_security > 73080 73080 100% 0.13K 2436 30 9744K kernfs_node_cache > 72360 70261 97% 0.59K 1340 54 42880K inode_cache > 71040 71040 100% 0.12K 2220 32 8880K eventpoll_epi > 68096 59262 87% 0.02K 266 256 1064K kmalloc-16 > 53652 53652 100% 0.04K 526 102 2104K pde_opener > 50496 31654 62% 2.00K 3156 16 100992K kmalloc-2048 > 46242 46242 100% 0.19K 1101 42 8808K cred_jar > 44496 43013 96% 0.66K 927 48 29664K proc_inode_cache > 44352 44352 100% 0.06K 693 64 2772K task_delay_info > 43516 43471 99% 0.69K 946 46 30272K sock_inode_cache > 37856 27626 72% 1.00K 1183 32 37856K kmalloc-1024 > 36736 36736 100% 0.07K 656 56 2624K eventpoll_pwq > 34076 31282 91% 0.57K 1217 28 19472K radix_tree_node > 33660 30528 90% 1.05K 1122 30 35904K ext4_inode_cache > 32760 30959 94% 0.19K 780 42 6240K kmalloc-192 > 32028 32028 100% 0.04K 314 102 1256K ext4_extent_status > 30048 30048 100% 0.25K 939 32 7512K skbuff_head_cache > 28736 28736 100% 0.06K 449 64 1796K fs_cache > 24702 24702 100% 0.69K 537 46 17184K files_cache > 23808 23808 100% 0.66K 496 48 15872K ovl_inode > 23104 22945 99% 0.12K 722 32 2888K kmalloc-128 > 22724 21307 93% 0.69K 494 46 15808K shmem_inode_cache > 21472 21472 100% 0.12K 671 32 2684K seq_file > 19904 19904 100% 1.00K 622 32 19904K UNIX > 17340 17340 100% 1.06K 578 30 18496K mm_struct > 15980 15980 100% 0.02K 94 170 376K avtab_node > 14070 14070 100% 1.06K 469 30 15008K signal_cache > 13248 13248 100% 0.12K 414 32 1656K pid > 12128 11777 97% 0.25K 379 32 3032K kmalloc-256 > 11008 11008 100% 0.02K 43 256 172K selinux_file_security > 10812 10812 100% 0.04K 106 102 424K Acpi-Namespace > > Is these info ring any bell for you? > > Ondrej Mosnacek <omosnace@redhat.com> 于2020年4月15日周三 下午9:44写道： >> >> On Wed, Apr 15, 2020 at 2:31 PM 郭彬 <anole1949@gmail.com> wrote: >> > I'm running a batch of CoreOS boxes, the lsb_release is: >> > >> > ``` >> > # cat /etc/lsb-release >> > DISTRIB_ID="Container Linux by CoreOS" >> > DISTRIB_RELEASE=2303.3.0 >> > DISTRIB_CODENAME="Rhyolite" >> > DISTRIB_DESCRIPTION="Container Linux by CoreOS 2303.3.0 (Rhyolite)" >> > ``` >> > >> > ``` >> > # uname -a >> > Linux cloud-worker-25 4.19.86-coreos #1 SMP Mon Dec 2 20:13:38 -00 2019 >> > x86_64 Intel(R) Xeon(R) CPU E5-2640 v2 @ 2.00GHz GenuineIntel GNU/Linux >> > ``` >> > Recently, I found my vms constently being killed due to OOM, and after >> > digging into the problem, I finally realized that the kernel is leaking >> > memory. >> > >> > Here's my slabinfo: >> > >> > ``` >> > # slabtop --sort c -o >> > Active / Total Objects (% used) : 739390584 / 740008326 (99.9%) >> > Active / Total Slabs (% used) : 11594275 / 11594275 (100.0%) >> > Active / Total Caches (% used) : 105 / 129 (81.4%) >> > Active / Total Size (% used) : 47121380.33K / 47376581.93K (99.5%) >> > Minimum / Average / Maximum Object : 0.01K / 0.06K / 8.00K >> > >> > OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME >> > 734506368 734506368 100% 0.06K 11476662 64 45906648K ebitmap_node >> [...] >> > You can see that the `ebitmap_node` is over 40GB and still growing. The >> > only thing I can do is rebooting the OS, but there are tens of them and >> > lots of workloads running on them, I can't just reboot whenever I want. >> > So, I run out of options, any help? >> >> Pasting in relevant comments/questions from [1]: >> >> 2. Your kernel seems to be quite behind the current upstream and is >> probably maintained by your distribution (seems to be derived from the >> 4.19 stable branch). Can you reproduce the issue on a more recent >> kernel (at least 5.5+)? If you can't or the recent kernel doesn't >> exhibit the issue, then you should report this to your distribution. >> 3. Was this working fine with some earlier kernel? If you can >> determine the last working version, then it could help us identify the >> cause and/or the fix. >> >> On top of that, I realized one more thing - the kernel merges the >> caches for objects of the same size - so any cache with object size 64 >> bytes will be accounted under 'ebitmap_node' here. For example, on my >> system there are several caches that all alias to the common 64-byte >> cache: >> # ls -l /sys/kernel/slab/ | grep -- '-> :0000064' >> lrwxrwxrwx. 1 root root 0 apr 15 15:26 dmaengine-unmap-2 -> :0000064 >> lrwxrwxrwx. 1 root root 0 apr 15 15:26 ebitmap_node -> :0000064 >> lrwxrwxrwx. 1 root root 0 apr 15 15:26 fanotify_event -> :0000064 >> lrwxrwxrwx. 1 root root 0 apr 15 15:26 io -> :0000064 >> lrwxrwxrwx. 1 root root 0 apr 15 15:26 iommu_iova -> :0000064 >> lrwxrwxrwx. 1 root root 0 apr 15 15:26 jbd2_inode -> :0000064 >> lrwxrwxrwx. 1 root root 0 apr 15 15:26 ksm_rmap_item -> :0000064 >> lrwxrwxrwx. 1 root root 0 apr 15 15:26 ksm_stable_node -> :0000064 >> lrwxrwxrwx. 1 root root 0 apr 15 15:26 vmap_area -> :0000064 >> >> On your kernel you might get a different list, but any of the caches >> you get could be the culprit, ebitmap_node is just one of the >> possibilities. You can disable this merging by adding "slab_nomerge" >> to your kernel boot command-line. That will allow you to identify >> which cache is really the source of the leak. >> >> [1] https://github.com/SELinuxProject/selinux/issues/220#issuecomment-613944748 >> >> -- >> Ondrej Mosnacek <omosnace at redhat dot com> >> Software Engineer, Security Technologies >> Red Hat, Inc. >> -- Ondrej Mosnacek <omosnace at redhat dot com> Software Engineer, Security Technologies Red Hat, Inc. ^ permalink raw reply [flat|nested] 3+ messages in thread
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2020-04-15 12:31 ebitmap_node ate over 40GB of memory 郭彬
2020-04-15 13:44 ` Ondrej Mosnacek
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2020-04-23 8:25 ` Ondrej Mosnacek
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