Re: 5.3-rc-8 hung task in IO (was: Re: lot of MemAvailable but falling cache and raising PSI)

[Stefan Priebe - Profihost AG <s.priebe@profihost.ag>]

HI,

i've now tried v5.2.14 but that one died with - i don't know which
version to try... now

2019-09-11 15:41:09     ------------[ cut here ]------------
2019-09-11 15:41:09     kernel BUG at mm/page-writeback.c:2655!
2019-09-11 15:41:09     invalid opcode: 0000 [#1] SMP PTI
2019-09-11 15:41:09     CPU: 4 PID: 466 Comm: kworker/u24:6 Not tainted
5.2.14 #1
2019-09-11 15:41:09     Hardware name: Supermicro Super Server/X10SRi-F,
BIOS 1.0b 04/21/2015
2019-09-11 15:41:09     Workqueue: btrfs-delalloc btrfs_delalloc_helper
[btrfs]
2019-09-11 15:41:09     RIP: 0010:clear_page_dirty_for_io+0xfc/0x210
2019-09-11 15:41:09     Code: 01 48 0f 44 d3 f0 48 0f ba 32 03 b8 00 00
00 00 72 1a 4d 85 e4 0f 85 b4 00 00 00 48 83 c4 08 5b 5d 41 5c 41 5d 41
5e 41 5f c3 <0f> 0b 9c 41 5f fa 48 8b 03 48 8b 53 38 48 c1 e8 36 48 85
d2 48 8b
2019-09-11 15:41:09     RSP: 0018:ffffbd4b8d2f3c18 EFLAGS: 00010246
2019-09-11 15:41:09     RAX: 001000000004205c RBX: ffffe660525b3140 RCX:
0000000000000000
2019-09-11 15:41:09     RDX: 0000000000000000 RSI: 0000000000000006 RDI:
ffffe660525b3140
2019-09-11 15:41:09     RBP: ffff9ad639868818 R08: 0000000000000001 R09:
000000000002de18
2019-09-11 15:41:09     R10: 0000000000000002 R11: ffff9ade7ffd6000 R12:
0000000000000000
2019-09-11 15:41:09     R13: 0000000000000001 R14: 0000000000000000 R15:
ffffbd4b8d2f3d08
2019-09-11 15:41:09     FS: 0000000000000000(0000)
GS:ffff9ade3f900000(0000) knlGS:0000000000000000
2019-09-11 15:41:09     CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
2019-09-11 15:41:09     CR2: 000055fa10d2bf70 CR3: 00000005a420a002 CR4:
00000000001606e0
2019-09-11 15:41:09     Call Trace:
2019-09-11 15:41:09     __process_pages_contig+0x270/0x360 [btrfs]
2019-09-11 15:41:09     submit_compressed_extents+0x39d/0x460 [btrfs]
2019-09-11 15:41:09     normal_work_helper+0x20f/0x320
[btrfs]process_one_work+0x18b/0x380worker_thread+0x4f/0x3a0
2019-09-11 15:41:09     ? rescuer_thread+0x330/0x330kthread+0xf8/0x130
2019-09-11 15:41:09     ?
kthread_create_worker_on_cpu+0x70/0x70ret_from_fork+0x35/0x40
2019-09-11 15:41:09     Modules linked in: netconsole xt_tcpudp xt_owner
xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 xt_multiport
ipt_REJECT nf_reject_ipv4 xt_set iptable_filter bpfilter fuse
ip_set_hash_net ip_set nfnetlink 8021q garp bonding sb_edac
x86_pkg_temp_thermal coretemp kvm_intel ast kvm ttm drm_kms_helper
irqbypass crc32_pclmul drm fb_sys_fops syscopyarea lpc_ich sysfillrect
ghash_clmulni_intel sysimgblt mfd_core sg wmi ipmi_si ipmi_devintf
ipmi_msghandler button ip_tables x_tables btrfs zstd_decompress
zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq
async_xor async_tx xor usbhid raid6_pq raid1 raid0 multipath linear
md_mod sd_mod xhci_pci ehci_pci igb xhci_hcd ehci_hcd i2c_algo_bit
i2c_i801 ahci ptp i2c_core usbcore libahci usb_common pps_core megaraid_sas
2019-09-11 15:41:09     ---[ end trace d9a3f99c047dc8bf ]---
2019-09-11 15:41:10     RIP: 0010:clear_page_dirty_for_io+0xfc/0x210
2019-09-11 15:41:10     Code: 01 48 0f 44 d3 f0 48 0f ba 32 03 b8 00 00
00 00 72 1a 4d 85 e4 0f 85 b4 00 00 00 48 83 c4 08 5b 5d 41 5c 41 5d 41
5e 41 5f c3 <0f> 0b 9c 41 5f fa 48 8b 03 48 8b 53 38 48 c1 e8 36 48 85
d2 48 8b
2019-09-11 15:41:10     RSP: 0018:ffffbd4b8d2f3c18 EFLAGS: 00010246
2019-09-11 15:41:10     RAX: 001000000004205c RBX: ffffe660525b3140 RCX:
0000000000000000
2019-09-11 15:41:10     RDX: 0000000000000000 RSI: 0000000000000006 RDI:
ffffe660525b3140
2019-09-11 15:41:10     RBP: ffff9ad639868818 R08: 0000000000000001 R09:
000000000002de18
2019-09-11 15:41:10     R10: 0000000000000002 R11: ffff9ade7ffd6000 R12:
0000000000000000
2019-09-11 15:41:10     R13: 0000000000000001 R14: 0000000000000000 R15:
ffffbd4b8d2f3d08
2019-09-11 15:41:10     FS: 0000000000000000(0000)
GS:ffff9ade3f900000(0000) knlGS:0000000000000000
2019-09-11 15:41:10     CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
2019-09-11 15:41:10     CR2: 000055fa10d2bf70 CR3: 00000005a420a002 CR4:
00000000001606e0
2019-09-11 15:41:10     Kernel panic - not syncing: Fatal exception
2019-09-11 15:41:10     Kernel Offset: 0x1a000000 from
0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
2019-09-11 15:41:10     Rebooting in 20 seconds..
2019-09-11 15:41:29     ACPI MEMORY or I/O RESET_REG.



Am 11.09.19 um 09:09 schrieb Michal Hocko:
> This smells like IO/Btrfs issue to me. Cc some more people.
> 
> On Wed 11-09-19 08:12:28, Stefan Priebe - Profihost AG wrote:
> [...]
>> Sadly i'm running into issues with btrfs on 5.3-rc8 - the rsync process
>> on backup disk completely hangs / is blocked at 100% i/o:
>> [54739.065906] INFO: task rsync:9830 blocked for more than 120 seconds.
>> [54739.066973]       Not tainted 5.3.0-rc8 #1
>> [54739.067988] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
>> disables this message.
>> [54739.069065] rsync           D    0  9830   9829 0x00004002
>> [54739.070146] Call Trace:
>> [54739.071183]  ? __schedule+0x3cf/0x680
>> [54739.072202]  ? bit_wait+0x50/0x50
>> [54739.073196]  schedule+0x39/0xa0
>> [54739.074213]  io_schedule+0x12/0x40
>> [54739.075219]  bit_wait_io+0xd/0x50
>> [54739.076227]  __wait_on_bit+0x66/0x90
>> [54739.077239]  ? bit_wait+0x50/0x50
>> [54739.078273]  out_of_line_wait_on_bit+0x8b/0xb0
>> [54739.078741]  ? init_wait_var_entry+0x40/0x40
>> [54739.079162]  lock_extent_buffer_for_io+0x10b/0x2c0 [btrfs]
>> [54739.079557]  btree_write_cache_pages+0x17d/0x350 [btrfs]
>> [54739.079956]  ? btrfs_set_token_32+0x72/0x130 [btrfs]
>> [54739.080357]  ? merge_state.part.47+0x3f/0x160 [btrfs]
>> [54739.080748]  do_writepages+0x1a/0x60
>> [54739.081140]  __filemap_fdatawrite_range+0xc8/0x100
>> [54739.081558]  ? convert_extent_bit+0x2e8/0x580 [btrfs]
>> [54739.081985]  btrfs_write_marked_extents+0x141/0x160 [btrfs]
>> [54739.082412]  btrfs_write_and_wait_transaction.isra.26+0x58/0xb0 [btrfs]
>> [54739.082847]  ? btrfs_commit_transaction+0x752/0x9d0 [btrfs]
>> [54739.083280]  btrfs_commit_transaction+0x752/0x9d0 [btrfs]
>> [54739.083725]  ? btrfs_log_dentry_safe+0x54/0x70 [btrfs]
>> [54739.084170]  btrfs_sync_file+0x395/0x3e0 [btrfs]
>> [54739.084608]  ? retarget_shared_pending+0x70/0x70
>> [54739.085049]  do_fsync+0x38/0x60
>> [54739.085494]  __x64_sys_fdatasync+0x13/0x20
>> [54739.085944]  do_syscall_64+0x55/0x1a0
>> [54739.086395]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
>> [54739.086850] RIP: 0033:0x7f1db3fc85f0
>> [54739.087310] Code: Bad RIP value.
>> [54739.087772] RSP: 002b:00007ffe6f827db8 EFLAGS: 00000246 ORIG_RAX:
>> 000000000000004b
>> [54739.088249] RAX: ffffffffffffffda RBX: 0000000000000001 RCX:
>> 00007f1db3fc85f0
>> [54739.088733] RDX: 00007f1db4aa6060 RSI: 0000000000000003 RDI:
>> 0000000000000001
>> [54739.089234] RBP: 0000000000000001 R08: 0000000000000000 R09:
>> 0000000081c492ca
>> [54739.089722] R10: 0000000000000008 R11: 0000000000000246 R12:
>> 0000000000000028
>> [54739.090205] R13: 00007ffe6f827e40 R14: 0000000000000000 R15:
>> 0000000000000000
>> [54859.899715] INFO: task rsync:9830 blocked for more than 241 seconds.
>> [54859.900863]       Not tainted 5.3.0-rc8 #1
>> [54859.901885] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
>> disables this message.
>> [54859.902909] rsync           D    0  9830   9829 0x00004002
>> [54859.903930] Call Trace:
>> [54859.904888]  ? __schedule+0x3cf/0x680
>> [54859.905831]  ? bit_wait+0x50/0x50
>> [54859.906751]  schedule+0x39/0xa0
>> [54859.907653]  io_schedule+0x12/0x40
>> [54859.908535]  bit_wait_io+0xd/0x50
>> [54859.909441]  __wait_on_bit+0x66/0x90
>> [54859.910306]  ? bit_wait+0x50/0x50
>> [54859.911177]  out_of_line_wait_on_bit+0x8b/0xb0
>> [54859.912043]  ? init_wait_var_entry+0x40/0x40
>> [54859.912727]  lock_extent_buffer_for_io+0x10b/0x2c0 [btrfs]
>> [54859.913113]  btree_write_cache_pages+0x17d/0x350 [btrfs]
>> [54859.913501]  ? btrfs_set_token_32+0x72/0x130 [btrfs]
>> [54859.913894]  ? merge_state.part.47+0x3f/0x160 [btrfs]
>> [54859.914276]  do_writepages+0x1a/0x60
>> [54859.914656]  __filemap_fdatawrite_range+0xc8/0x100
>> [54859.915052]  ? convert_extent_bit+0x2e8/0x580 [btrfs]
>> [54859.915449]  btrfs_write_marked_extents+0x141/0x160 [btrfs]
>> [54859.915855]  btrfs_write_and_wait_transaction.isra.26+0x58/0xb0 [btrfs]
>> [54859.916256]  ? btrfs_commit_transaction+0x752/0x9d0 [btrfs]
>> [54859.916658]  btrfs_commit_transaction+0x752/0x9d0 [btrfs]
>> [54859.917078]  ? btrfs_log_dentry_safe+0x54/0x70 [btrfs]
>> [54859.917497]  btrfs_sync_file+0x395/0x3e0 [btrfs]
>> [54859.917903]  ? retarget_shared_pending+0x70/0x70
>> [54859.918307]  do_fsync+0x38/0x60
>> [54859.918707]  __x64_sys_fdatasync+0x13/0x20
>> [54859.919106]  do_syscall_64+0x55/0x1a0
>> [54859.919482]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
>> [54859.919866] RIP: 0033:0x7f1db3fc85f0
>> [54859.920243] Code: Bad RIP value.
>> [54859.920614] RSP: 002b:00007ffe6f827db8 EFLAGS: 00000246 ORIG_RAX:
>> 000000000000004b
>> [54859.920997] RAX: ffffffffffffffda RBX: 0000000000000001 RCX:
>> 00007f1db3fc85f0
>> [54859.921383] RDX: 00007f1db4aa6060 RSI: 0000000000000003 RDI:
>> 0000000000000001
>> [54859.921773] RBP: 0000000000000001 R08: 0000000000000000 R09:
>> 0000000081c492ca
>> [54859.922165] R10: 0000000000000008 R11: 0000000000000246 R12:
>> 0000000000000028
>> [54859.922551] R13: 00007ffe6f827e40 R14: 0000000000000000 R15:
>> 0000000000000000
>> [54980.733463] INFO: task rsync:9830 blocked for more than 362 seconds.
>> [54980.734061]       Not tainted 5.3.0-rc8 #1
>> [54980.734619] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
>> disables this message.
>> [54980.735209] rsync           D    0  9830   9829 0x00004002
>> [54980.735802] Call Trace:
>> [54980.736473]  ? __schedule+0x3cf/0x680
>> [54980.737054]  ? bit_wait+0x50/0x50
>> [54980.737664]  schedule+0x39/0xa0
>> [54980.738243]  io_schedule+0x12/0x40
>> [54980.738712]  bit_wait_io+0xd/0x50
>> [54980.739171]  __wait_on_bit+0x66/0x90
>> [54980.739623]  ? bit_wait+0x50/0x50
>> [54980.740073]  out_of_line_wait_on_bit+0x8b/0xb0
>> [54980.740548]  ? init_wait_var_entry+0x40/0x40
>> [54980.741033]  lock_extent_buffer_for_io+0x10b/0x2c0 [btrfs]
>> [54980.741579]  btree_write_cache_pages+0x17d/0x350 [btrfs]
>> [54980.742076]  ? btrfs_set_token_32+0x72/0x130 [btrfs]
>> [54980.742560]  ? merge_state.part.47+0x3f/0x160 [btrfs]
>> [54980.743045]  do_writepages+0x1a/0x60
>> [54980.743516]  __filemap_fdatawrite_range+0xc8/0x100
>> [54980.744019]  ? convert_extent_bit+0x2e8/0x580 [btrfs]
>> [54980.744513]  btrfs_write_marked_extents+0x141/0x160 [btrfs]
>> [54980.745026]  btrfs_write_and_wait_transaction.isra.26+0x58/0xb0 [btrfs]
>> [54980.745563]  ? btrfs_commit_transaction+0x752/0x9d0 [btrfs]
>> [54980.746073]  btrfs_commit_transaction+0x752/0x9d0 [btrfs]
>> [54980.746575]  ? btrfs_log_dentry_safe+0x54/0x70 [btrfs]
>> [54980.747074]  btrfs_sync_file+0x395/0x3e0 [btrfs]
>> [54980.747575]  ? retarget_shared_pending+0x70/0x70
>> [54980.748059]  do_fsync+0x38/0x60
>> [54980.748539]  __x64_sys_fdatasync+0x13/0x20
>> [54980.749012]  do_syscall_64+0x55/0x1a0
>> [54980.749512]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
>> [54980.749995] RIP: 0033:0x7f1db3fc85f0
>> [54980.750368] Code: Bad RIP value.
>> [54980.750735] RSP: 002b:00007ffe6f827db8 EFLAGS: 00000246 ORIG_RAX:
>> 000000000000004b
>> [54980.751117] RAX: ffffffffffffffda RBX: 0000000000000001 RCX:
>> 00007f1db3fc85f0
>> [54980.751505] RDX: 00007f1db4aa6060 RSI: 0000000000000003 RDI:
>> 0000000000000001
>> [54980.751895] RBP: 0000000000000001 R08: 0000000000000000 R09:
>> 0000000081c492ca
>> [54980.752291] R10: 0000000000000008 R11: 0000000000000246 R12:
>> 0000000000000028
>> [54980.752680] R13: 00007ffe6f827e40 R14: 0000000000000000 R15:
>> 0000000000000000
>> [55101.567251] INFO: task rsync:9830 blocked for more than 483 seconds.
>> [55101.567775]       Not tainted 5.3.0-rc8 #1
>> [55101.568218] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
>> disables this message.
>> [55101.568649] rsync           D    0  9830   9829 0x00004002
>> [55101.569101] Call Trace:
>> [55101.569609]  ? __schedule+0x3cf/0x680
>> [55101.570052]  ? bit_wait+0x50/0x50
>> [55101.570504]  schedule+0x39/0xa0
>> [55101.570938]  io_schedule+0x12/0x40
>> [55101.571404]  bit_wait_io+0xd/0x50
>> [55101.571934]  __wait_on_bit+0x66/0x90
>> [55101.572601]  ? bit_wait+0x50/0x50
>> [55101.573235]  out_of_line_wait_on_bit+0x8b/0xb0
>> [55101.573599]  ? init_wait_var_entry+0x40/0x40
>> [55101.574008]  lock_extent_buffer_for_io+0x10b/0x2c0 [btrfs]
>> [55101.574394]  btree_write_cache_pages+0x17d/0x350 [btrfs]
>> [55101.574783]  ? btrfs_set_token_32+0x72/0x130 [btrfs]
>> [55101.575184]  ? merge_state.part.47+0x3f/0x160 [btrfs]
>> [55101.575580]  do_writepages+0x1a/0x60
>> [55101.575959]  __filemap_fdatawrite_range+0xc8/0x100
>> [55101.576351]  ? convert_extent_bit+0x2e8/0x580 [btrfs]
>> [55101.576746]  btrfs_write_marked_extents+0x141/0x160 [btrfs]
>> [55101.577144]  btrfs_write_and_wait_transaction.isra.26+0x58/0xb0 [btrfs]
>> [55101.577543]  ? btrfs_commit_transaction+0x752/0x9d0 [btrfs]
>> [55101.577939]  btrfs_commit_transaction+0x752/0x9d0 [btrfs]
>> [55101.578343]  ? btrfs_log_dentry_safe+0x54/0x70 [btrfs]
>> [55101.578746]  btrfs_sync_file+0x395/0x3e0 [btrfs]
>> [55101.579139]  ? retarget_shared_pending+0x70/0x70
>> [55101.579543]  do_fsync+0x38/0x60
>> [55101.579928]  __x64_sys_fdatasync+0x13/0x20
>> [55101.580312]  do_syscall_64+0x55/0x1a0
>> [55101.580706]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
>> [55101.581086] RIP: 0033:0x7f1db3fc85f0
>> [55101.581463] Code: Bad RIP value.
>> [55101.581834] RSP: 002b:00007ffe6f827db8 EFLAGS: 00000246 ORIG_RAX:
>> 000000000000004b
>> [55101.582219] RAX: ffffffffffffffda RBX: 0000000000000001 RCX:
>> 00007f1db3fc85f0
>> [55101.582607] RDX: 00007f1db4aa6060 RSI: 0000000000000003 RDI:
>> 0000000000000001
>> [55101.582998] RBP: 0000000000000001 R08: 0000000000000000 R09:
>> 0000000081c492ca
>> [55101.583397] R10: 0000000000000008 R11: 0000000000000246 R12:
>> 0000000000000028
>> [55101.583784] R13: 00007ffe6f827e40 R14: 0000000000000000 R15:
>> 0000000000000000
>> [55222.405056] INFO: task rsync:9830 blocked for more than 604 seconds.
>> [55222.405773]       Not tainted 5.3.0-rc8 #1
>> [55222.406456] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
>> disables this message.
>> [55222.407158] rsync           D    0  9830   9829 0x00004002
>> [55222.407776] Call Trace:
>> [55222.408450]  ? __schedule+0x3cf/0x680
>> [55222.409206]  ? bit_wait+0x50/0x50
>> [55222.409942]  schedule+0x39/0xa0
>> [55222.410658]  io_schedule+0x12/0x40
>> [55222.411346]  bit_wait_io+0xd/0x50
>> [55222.411946]  __wait_on_bit+0x66/0x90
>> [55222.412572]  ? bit_wait+0x50/0x50
>> [55222.413249]  out_of_line_wait_on_bit+0x8b/0xb0
>> [55222.413944]  ? init_wait_var_entry+0x40/0x40
>> [55222.414675]  lock_extent_buffer_for_io+0x10b/0x2c0 [btrfs]
>> [55222.415362]  btree_write_cache_pages+0x17d/0x350 [btrfs]
>> [55222.416085]  ? btrfs_set_token_32+0x72/0x130 [btrfs]
>> [55222.416796]  ? merge_state.part.47+0x3f/0x160 [btrfs]
>> [55222.417505]  do_writepages+0x1a/0x60
>> [55222.418243]  __filemap_fdatawrite_range+0xc8/0x100
>> [55222.418969]  ? convert_extent_bit+0x2e8/0x580 [btrfs]
>> [55222.419713]  btrfs_write_marked_extents+0x141/0x160 [btrfs]
>> [55222.420453]  btrfs_write_and_wait_transaction.isra.26+0x58/0xb0 [btrfs]
>> [55222.421206]  ? btrfs_commit_transaction+0x752/0x9d0 [btrfs]
>> [55222.421925]  btrfs_commit_transaction+0x752/0x9d0 [btrfs]
>> [55222.422656]  ? btrfs_log_dentry_safe+0x54/0x70 [btrfs]
>> [55222.423400]  btrfs_sync_file+0x395/0x3e0 [btrfs]
>> [55222.424140]  ? retarget_shared_pending+0x70/0x70
>> [55222.424861]  do_fsync+0x38/0x60
>> [55222.425581]  __x64_sys_fdatasync+0x13/0x20
>> [55222.426308]  do_syscall_64+0x55/0x1a0
>> [55222.427025]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
>> [55222.427732] RIP: 0033:0x7f1db3fc85f0
>> [55222.428396] Code: Bad RIP value.
>> [55222.429087] RSP: 002b:00007ffe6f827db8 EFLAGS: 00000246 ORIG_RAX:
>> 000000000000004b
>> [55222.429757] RAX: ffffffffffffffda RBX: 0000000000000001 RCX:
>> 00007f1db3fc85f0
>> [55222.430451] RDX: 00007f1db4aa6060 RSI: 0000000000000003 RDI:
>> 0000000000000001
>> [55222.431159] RBP: 0000000000000001 R08: 0000000000000000 R09:
>> 0000000081c492ca
>> [55222.431856] R10: 0000000000000008 R11: 0000000000000246 R12:
>> 0000000000000028
>> [55222.432544] R13: 00007ffe6f827e40 R14: 0000000000000000 R15:
>> 0000000000000000
>> [55343.234863] INFO: task rsync:9830 blocked for more than 724 seconds.
>> [55343.235887]       Not tainted 5.3.0-rc8 #1
>> [55343.236611] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
>> disables this message.
>> [55343.237213] rsync           D    0  9830   9829 0x00004002
>> [55343.237766] Call Trace:
>> [55343.238353]  ? __schedule+0x3cf/0x680
>> [55343.238971]  ? bit_wait+0x50/0x50
>> [55343.239592]  schedule+0x39/0xa0
>> [55343.240173]  io_schedule+0x12/0x40
>> [55343.240721]  bit_wait_io+0xd/0x50
>> [55343.241266]  __wait_on_bit+0x66/0x90
>> [55343.241835]  ? bit_wait+0x50/0x50
>> [55343.242418]  out_of_line_wait_on_bit+0x8b/0xb0
>> [55343.242938]  ? init_wait_var_entry+0x40/0x40
>> [55343.243496]  lock_extent_buffer_for_io+0x10b/0x2c0 [btrfs]
>> [55343.244090]  btree_write_cache_pages+0x17d/0x350 [btrfs]
>> [55343.244720]  ? btrfs_set_token_32+0x72/0x130 [btrfs]
>> [55343.245296]  ? merge_state.part.47+0x3f/0x160 [btrfs]
>> [55343.245843]  do_writepages+0x1a/0x60
>> [55343.246407]  __filemap_fdatawrite_range+0xc8/0x100
>> [55343.247014]  ? convert_extent_bit+0x2e8/0x580 [btrfs]
>> [55343.247631]  btrfs_write_marked_extents+0x141/0x160 [btrfs]
>> [55343.248186]  btrfs_write_and_wait_transaction.isra.26+0x58/0xb0 [btrfs]
>> [55343.248743]  ? btrfs_commit_transaction+0x752/0x9d0 [btrfs]
>> [55343.249326]  btrfs_commit_transaction+0x752/0x9d0 [btrfs]
>> [55343.249931]  ? btrfs_log_dentry_safe+0x54/0x70 [btrfs]
>> [55343.250562]  btrfs_sync_file+0x395/0x3e0 [btrfs]
>> [55343.251139]  ? retarget_shared_pending+0x70/0x70
>> [55343.251628]  do_fsync+0x38/0x60
>> [55343.252208]  __x64_sys_fdatasync+0x13/0x20
>> [55343.252702]  do_syscall_64+0x55/0x1a0
>> [55343.253212]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
>> [55343.253798] RIP: 0033:0x7f1db3fc85f0
>> [55343.254294] Code: Bad RIP value.
>> [55343.254821] RSP: 002b:00007ffe6f827db8 EFLAGS: 00000246 ORIG_RAX:
>> 000000000000004b
>> [55343.255404] RAX: ffffffffffffffda RBX: 0000000000000001 RCX:
>> 00007f1db3fc85f0
>> [55343.255989] RDX: 00007f1db4aa6060 RSI: 0000000000000003 RDI:
>> 0000000000000001
>> [55343.256521] RBP: 0000000000000001 R08: 0000000000000000 R09:
>> 0000000081c492ca
>> [55343.257073] R10: 0000000000000008 R11: 0000000000000246 R12:
>> 0000000000000028
>> [55343.257649] R13: 00007ffe6f827e40 R14: 0000000000000000 R15:
>> 0000000000000000
>> [55464.068704] INFO: task rsync:9830 blocked for more than 845 seconds.
>> [55464.069701]       Not tainted 5.3.0-rc8 #1
>> [55464.070655] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
>> disables this message.
>> [55464.071637] rsync           D    0  9830   9829 0x00004002
>> [55464.072637] Call Trace:
>> [55464.073623]  ? __schedule+0x3cf/0x680
>> [55464.074604]  ? bit_wait+0x50/0x50
>> [55464.075577]  schedule+0x39/0xa0
>> [55464.076531]  io_schedule+0x12/0x40
>> [55464.077480]  bit_wait_io+0xd/0x50
>> [55464.078400]  __wait_on_bit+0x66/0x90
>> [55464.079300]  ? bit_wait+0x50/0x50
>> [55464.080184]  out_of_line_wait_on_bit+0x8b/0xb0
>> [55464.081107]  ? init_wait_var_entry+0x40/0x40
>> [55464.082047]  lock_extent_buffer_for_io+0x10b/0x2c0 [btrfs]
>> [55464.083001]  btree_write_cache_pages+0x17d/0x350 [btrfs]
>> [55464.083963]  ? btrfs_set_token_32+0x72/0x130 [btrfs]
>> [55464.084944]  ? merge_state.part.47+0x3f/0x160 [btrfs]
>> [55464.085456]  do_writepages+0x1a/0x60
>> [55464.085840]  __filemap_fdatawrite_range+0xc8/0x100
>> [55464.086231]  ? convert_extent_bit+0x2e8/0x580 [btrfs]
>> [55464.086625]  btrfs_write_marked_extents+0x141/0x160 [btrfs]
>> [55464.087019]  btrfs_write_and_wait_transaction.isra.26+0x58/0xb0 [btrfs]
>> [55464.087417]  ? btrfs_commit_transaction+0x752/0x9d0 [btrfs]
>> [55464.087814]  btrfs_commit_transaction+0x752/0x9d0 [btrfs]
>> [55464.088219]  ? btrfs_log_dentry_safe+0x54/0x70 [btrfs]
>> [55464.088652]  btrfs_sync_file+0x395/0x3e0 [btrfs]
>> [55464.089043]  ? retarget_shared_pending+0x70/0x70
>> [55464.089429]  do_fsync+0x38/0x60
>> [55464.089811]  __x64_sys_fdatasync+0x13/0x20
>> [55464.090190]  do_syscall_64+0x55/0x1a0
>> [55464.090568]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
>> [55464.090944] RIP: 0033:0x7f1db3fc85f0
>> [55464.091321] Code: Bad RIP value.
>> [55464.091693] RSP: 002b:00007ffe6f827db8 EFLAGS: 00000246 ORIG_RAX:
>> 000000000000004b
>> [55464.092078] RAX: ffffffffffffffda RBX: 0000000000000001 RCX:
>> 00007f1db3fc85f0
>> [55464.092467] RDX: 00007f1db4aa6060 RSI: 0000000000000003 RDI:
>> 0000000000000001
>> [55464.092863] RBP: 0000000000000001 R08: 0000000000000000 R09:
>> 0000000081c492ca
>> [55464.093254] R10: 0000000000000008 R11: 0000000000000246 R12:
>> 0000000000000028
>> [55464.093643] R13: 00007ffe6f827e40 R14: 0000000000000000 R15:
>> 0000000000000000
>> [55584.902564] INFO: task rsync:9830 blocked for more than 966 seconds.
>> [55584.903748]       Not tainted 5.3.0-rc8 #1
>> [55584.904868] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
>> disables this message.
>> [55584.906023] rsync           D    0  9830   9829 0x00004002
>> [55584.907207] Call Trace:
>> [55584.908355]  ? __schedule+0x3cf/0x680
>> [55584.909507]  ? bit_wait+0x50/0x50
>> [55584.910682]  schedule+0x39/0xa0
>> [55584.911230]  io_schedule+0x12/0x40
>> [55584.911666]  bit_wait_io+0xd/0x50
>> [55584.912092]  __wait_on_bit+0x66/0x90
>> [55584.912510]  ? bit_wait+0x50/0x50
>> [55584.912924]  out_of_line_wait_on_bit+0x8b/0xb0
>> [55584.913343]  ? init_wait_var_entry+0x40/0x40
>> [55584.913795]  lock_extent_buffer_for_io+0x10b/0x2c0 [btrfs]
>> [55584.914242]  btree_write_cache_pages+0x17d/0x350 [btrfs]
>> [55584.914698]  ? btrfs_set_token_32+0x72/0x130 [btrfs]
>> [55584.915152]  ? merge_state.part.47+0x3f/0x160 [btrfs]
>> [55584.915588]  do_writepages+0x1a/0x60
>> [55584.916022]  __filemap_fdatawrite_range+0xc8/0x100
>> [55584.916474]  ? convert_extent_bit+0x2e8/0x580 [btrfs]
>> [55584.916928]  btrfs_write_marked_extents+0x141/0x160 [btrfs]
>> [55584.917386]  btrfs_write_and_wait_transaction.isra.26+0x58/0xb0 [btrfs]
>> [55584.917844]  ? btrfs_commit_transaction+0x752/0x9d0 [btrfs]
>> [55584.918300]  btrfs_commit_transaction+0x752/0x9d0 [btrfs]
>> [55584.918772]  ? btrfs_log_dentry_safe+0x54/0x70 [btrfs]
>> [55584.919233]  btrfs_sync_file+0x395/0x3e0 [btrfs]
>> [55584.919679]  ? retarget_shared_pending+0x70/0x70
>> [55584.920122]  do_fsync+0x38/0x60
>> [55584.920559]  __x64_sys_fdatasync+0x13/0x20
>> [55584.920996]  do_syscall_64+0x55/0x1a0
>> [55584.921429]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
>> [55584.921865] RIP: 0033:0x7f1db3fc85f0
>> [55584.922298] Code: Bad RIP value.
>> [55584.922734] RSP: 002b:00007ffe6f827db8 EFLAGS: 00000246 ORIG_RAX:
>> 000000000000004b
>> [55584.923174] RAX: ffffffffffffffda RBX: 0000000000000001 RCX:
>> 00007f1db3fc85f0
>> [55584.923568] RDX: 00007f1db4aa6060 RSI: 0000000000000003 RDI:
>> 0000000000000001
>> [55584.923982] RBP: 0000000000000001 R08: 0000000000000000 R09:
>> 0000000081c492ca
>> [55584.924378] R10: 0000000000000008 R11: 0000000000000246 R12:
>> 0000000000000028
>> [55584.924774] R13: 00007ffe6f827e40 R14: 0000000000000000 R15:
>> 0000000000000000
>> [55705.736285] INFO: task rsync:9830 blocked for more than 1087 seconds.
>> [55705.736999]       Not tainted 5.3.0-rc8 #1
>> [55705.737694] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
>> disables this message.
>> [55705.738411] rsync           D    0  9830   9829 0x00004002
>> [55705.739072] Call Trace:
>> [55705.739455]  ? __schedule+0x3cf/0x680
>> [55705.739837]  ? bit_wait+0x50/0x50
>> [55705.740215]  schedule+0x39/0xa0
>> [55705.740610]  io_schedule+0x12/0x40
>> [55705.741243]  bit_wait_io+0xd/0x50
>> [55705.741897]  __wait_on_bit+0x66/0x90
>> [55705.742524]  ? bit_wait+0x50/0x50
>> [55705.743131]  out_of_line_wait_on_bit+0x8b/0xb0
>> [55705.743750]  ? init_wait_var_entry+0x40/0x40
>> [55705.744128]  lock_extent_buffer_for_io+0x10b/0x2c0 [btrfs]
>> [55705.744766]  btree_write_cache_pages+0x17d/0x350 [btrfs]
>> [55705.745440]  ? btrfs_set_token_32+0x72/0x130 [btrfs]
>> [55705.746118]  ? merge_state.part.47+0x3f/0x160 [btrfs]
>> [55705.746753]  do_writepages+0x1a/0x60
>> [55705.747411]  __filemap_fdatawrite_range+0xc8/0x100
>> [55705.748106]  ? convert_extent_bit+0x2e8/0x580 [btrfs]
>> [55705.748807]  btrfs_write_marked_extents+0x141/0x160 [btrfs]
>> [55705.749495]  btrfs_write_and_wait_transaction.isra.26+0x58/0xb0 [btrfs]
>> [55705.750190]  ? btrfs_commit_transaction+0x752/0x9d0 [btrfs]
>> [55705.750890]  btrfs_commit_transaction+0x752/0x9d0 [btrfs]
>> [55705.751580]  ? btrfs_log_dentry_safe+0x54/0x70 [btrfs]
>> [55705.752293]  btrfs_sync_file+0x395/0x3e0 [btrfs]
>> [55705.752981]  ? retarget_shared_pending+0x70/0x70
>> [55705.753686]  do_fsync+0x38/0x60
>> [55705.754340]  __x64_sys_fdatasync+0x13/0x20
>> [55705.755012]  do_syscall_64+0x55/0x1a0
>> [55705.755678]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
>> [55705.756375] RIP: 0033:0x7f1db3fc85f0
>> [55705.757042] Code: Bad RIP value.
>> [55705.757690] RSP: 002b:00007ffe6f827db8 EFLAGS: 00000246 ORIG_RAX:
>> 000000000000004b
>> [55705.758300] RAX: ffffffffffffffda RBX: 0000000000000001 RCX:
>> 00007f1db3fc85f0
>> [55705.758678] RDX: 00007f1db4aa6060 RSI: 0000000000000003 RDI:
>> 0000000000000001
>> [55705.759107] RBP: 0000000000000001 R08: 0000000000000000 R09:
>> 0000000081c492ca
>> [55705.759785] R10: 0000000000000008 R11: 0000000000000246 R12:
>> 0000000000000028
>> [55705.760471] R13: 00007ffe6f827e40 R14: 0000000000000000 R15:
>> 0000000000000000
>> [55826.570182] INFO: task rsync:9830 blocked for more than 1208 seconds.
>> [55826.571349]       Not tainted 5.3.0-rc8 #1
>> [55826.572469] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
>> disables this message.
>> [55826.573618] rsync           D    0  9830   9829 0x00004002
>> [55826.574790] Call Trace:
>> [55826.575932]  ? __schedule+0x3cf/0x680
>> [55826.577079]  ? bit_wait+0x50/0x50
>> [55826.578233]  schedule+0x39/0xa0
>> [55826.579350]  io_schedule+0x12/0x40
>> [55826.580451]  bit_wait_io+0xd/0x50
>> [55826.581527]  __wait_on_bit+0x66/0x90
>> [55826.582596]  ? bit_wait+0x50/0x50
>> [55826.583178]  out_of_line_wait_on_bit+0x8b/0xb0
>> [55826.583550]  ? init_wait_var_entry+0x40/0x40
>> [55826.583953]  lock_extent_buffer_for_io+0x10b/0x2c0 [btrfs]
>> [55826.584356]  btree_write_cache_pages+0x17d/0x350 [btrfs]
>> [55826.584755]  ? btrfs_set_token_32+0x72/0x130 [btrfs]
>> [55826.585155]  ? merge_state.part.47+0x3f/0x160 [btrfs]
>> [55826.585547]  do_writepages+0x1a/0x60
>> [55826.585937]  __filemap_fdatawrite_range+0xc8/0x100
>> [55826.586352]  ? convert_extent_bit+0x2e8/0x580 [btrfs]
>> [55826.586761]  btrfs_write_marked_extents+0x141/0x160 [btrfs]
>> [55826.587171]  btrfs_write_and_wait_transaction.isra.26+0x58/0xb0 [btrfs]
>> [55826.587581]  ? btrfs_commit_transaction+0x752/0x9d0 [btrfs]
>> [55826.587990]  btrfs_commit_transaction+0x752/0x9d0 [btrfs]
>> [55826.588406]  ? btrfs_log_dentry_safe+0x54/0x70 [btrfs]
>> [55826.588818]  btrfs_sync_file+0x395/0x3e0 [btrfs]
>> [55826.589219]  ? retarget_shared_pending+0x70/0x70
>> [55826.589617]  do_fsync+0x38/0x60
>> [55826.590011]  __x64_sys_fdatasync+0x13/0x20
>> [55826.590411]  do_syscall_64+0x55/0x1a0
>> [55826.590798]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
>> [55826.591185] RIP: 0033:0x7f1db3fc85f0
>> [55826.591572] Code: Bad RIP value.
>> [55826.591952] RSP: 002b:00007ffe6f827db8 EFLAGS: 00000246 ORIG_RAX:
>> 000000000000004b
>> [55826.592347] RAX: ffffffffffffffda RBX: 0000000000000001 RCX:
>> 00007f1db3fc85f0
>> [55826.592743] RDX: 00007f1db4aa6060 RSI: 0000000000000003 RDI:
>> 0000000000000001
>> [55826.593143] RBP: 0000000000000001 R08: 0000000000000000 R09:
>> 0000000081c492ca
>> [55826.593543] R10: 0000000000000008 R11: 0000000000000246 R12:
>> 0000000000000028
>> [55826.593941] R13: 00007ffe6f827e40 R14: 0000000000000000 R15:
>> 0000000000000000
>>
>>
>> Greets,
>> Stefan
>