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* md raid hangs when using multi-queue schedulers
@ 2019-05-11  6:58 Piotr Gabriel Kosinski
  0 siblings, 0 replies; only message in thread
From: Piotr Gabriel Kosinski @ 2019-05-11  6:58 UTC (permalink / raw)
  To: axboe; +Cc: linux-block

Hello,

On kernel 5.0.13, when trying to use (newly created) md raid1 arrays
with multi-queue schedulers, a hang always happens (usually within a
few hours) in the kernel.

Initially I assumed that the patch
https://patchwork.kernel.org/patch/10787903/ will fix all the
mq/mdraid related freezes, but they still occur.

I have experienced similar problems on the 4.19 kernels, but I was
able to workaround them using scsi_mod.use_blk_mq=0.

Since kernel 5.0 that is not possible anymore as the single-queue
schedulers have been removed.

Relevant parts of the kernel log:

May 10 17:51:08 server kernel: INFO: task md0_raid1:435 blocked for
more than 120 seconds.
May 10 17:51:08 server kernel:       Not tainted 5.0.13-arch1-1-ARCH #1
May 10 17:51:08 server kernel: "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
May 10 17:51:08 server kernel: md0_raid1       D    0   435      2 0x80000080
May 10 17:51:08 server kernel: Call Trace:
May 10 17:51:08 server kernel:  ? __schedule+0x30b/0x8b0
May 10 17:51:08 server kernel:  ? preempt_count_add+0x79/0xb0
May 10 17:51:08 server kernel:  schedule+0x32/0x80
May 10 17:51:08 server kernel:  md_super_wait+0x69/0xa0 [md_mod]
May 10 17:51:08 server kernel:  ? wait_woken+0x80/0x80
May 10 17:51:08 server kernel:  md_bitmap_wait_writes+0x8e/0xa0 [md_mod]
May 10 17:51:08 server kernel:  md_bitmap_unplug+0xf9/0x110 [md_mod]
May 10 17:51:08 server kernel:  flush_bio_list+0x1e/0xe0 [raid1]
May 10 17:51:08 server kernel:  flush_pending_writes+0x81/0xc0 [raid1]
May 10 17:51:08 server kernel:  raid1d+0xa3/0x12d0 [raid1]
May 10 17:51:08 server kernel:  ? preempt_count_add+0x79/0xb0
May 10 17:51:08 server kernel:  ? _raw_spin_lock_irqsave+0x25/0x50
May 10 17:51:08 server kernel:  ? lock_timer_base+0x67/0x80
May 10 17:51:08 server kernel:  ? _raw_spin_unlock_irqrestore+0x20/0x40
May 10 17:51:08 server kernel:  ? try_to_del_timer_sync+0x4d/0x80
May 10 17:51:08 server kernel:  ? md_register_thread+0xd0/0xd0 [md_mod]
May 10 17:51:08 server kernel:  ? md_thread+0xf9/0x160 [md_mod]
May 10 17:51:08 server kernel:  ? abort_sync_write.isra.5+0x70/0x70 [raid1]
May 10 17:51:08 server kernel:  md_thread+0xf9/0x160 [md_mod]
May 10 17:51:08 server kernel:  ? wait_woken+0x80/0x80
May 10 17:51:08 server kernel:  kthread+0x112/0x130
May 10 17:51:08 server kernel:  ? kthread_park+0x80/0x80
May 10 17:51:08 server kernel:  ret_from_fork+0x35/0x40

May 10 17:51:08 server kernel: INFO: task md0_resync:443 blocked for
more than 120 seconds.
May 10 17:51:08 server kernel:       Not tainted 5.0.13-arch1-1-ARCH #1
May 10 17:51:08 server kernel: "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
May 10 17:51:08 server kernel: md0_resync      D    0   443      2 0x80000080
May 10 17:51:09 server kernel: Call Trace:
May 10 17:51:09 server kernel:  ? __schedule+0x30b/0x8b0
May 10 17:51:09 server kernel:  schedule+0x32/0x80
May 10 17:51:09 server kernel:  raid1_sync_request+0x97f/0xb90 [raid1]
May 10 17:51:09 server kernel:  ? is_mddev_idle+0xbe/0x137 [md_mod]
May 10 17:51:09 server kernel:  ? wait_woken+0x80/0x80
May 10 17:51:09 server kernel:  md_do_sync.cold.53+0x43c/0x98f [md_mod]
May 10 17:51:09 server kernel:  ? 0xffffffff9a000000
May 10 17:51:09 server kernel:  ? __switch_to_asm+0x34/0x70
May 10 17:51:09 server kernel:  ? wait_woken+0x80/0x80
May 10 17:51:09 server kernel:  ? _raw_spin_unlock_irq+0x1d/0x30
May 10 17:51:09 server kernel:  ? md_register_thread+0xd0/0xd0 [md_mod]
May 10 17:51:09 server kernel:  md_thread+0xf9/0x160 [md_mod]
May 10 17:51:09 server kernel:  ? preempt_count_add+0x79/0xb0
May 10 17:51:09 server kernel:  ? _raw_spin_lock_irqsave+0x25/0x50
May 10 17:51:09 server kernel:  ? _raw_spin_unlock_irqrestore+0x20/0x40
May 10 17:51:09 server kernel:  kthread+0x112/0x130
May 10 17:51:09 server kernel:  ? kthread_park+0x80/0x80
May 10 17:51:09 server kernel:  ret_from_fork+0x35/0x40

May 10 17:51:09 server kernel: INFO: task jbd2/md0-8:498 blocked for
more than 120 seconds.
May 10 17:51:09 server kernel:       Not tainted 5.0.13-arch1-1-ARCH #1
May 10 17:51:09 server kernel: "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
May 10 17:51:09 server kernel: jbd2/md0-8      D    0   498      2 0x80000080
May 10 17:51:09 server kernel: Call Trace:
May 10 17:51:09 server kernel:  ? __schedule+0x30b/0x8b0
May 10 17:51:09 server kernel:  ? __wake_up_common_lock+0x89/0xc0
May 10 17:51:09 server kernel:  ? wait_woken+0x80/0x80
May 10 17:51:09 server kernel:  schedule+0x32/0x80
May 10 17:51:09 server kernel:
jbd2_journal_commit_transaction+0x250/0x18c0 [jbd2]
May 10 17:51:09 server kernel:  ? __switch_to_asm+0x40/0x70
May 10 17:51:09 server kernel:  ? __switch_to_asm+0x34/0x70
May 10 17:51:09 server kernel:  ? __switch_to_asm+0x40/0x70
May 10 17:51:09 server kernel:  ? __switch_to_asm+0x40/0x70
May 10 17:51:09 server kernel:  ? __switch_to_asm+0x40/0x70
May 10 17:51:09 server kernel:  ? __switch_to_asm+0x34/0x70
May 10 17:51:09 server kernel:  ? __switch_to_asm+0x34/0x70
May 10 17:51:09 server kernel:  ? __switch_to_asm+0x40/0x70
May 10 17:51:09 server kernel:  ? __switch_to_asm+0x34/0x70
May 10 17:51:09 server kernel:  ? __switch_to_asm+0x34/0x70
May 10 17:51:09 server kernel:  ? wait_woken+0x80/0x80
May 10 17:51:09 server kernel:  ? preempt_count_add+0x79/0xb0
May 10 17:51:09 server kernel:  ? lock_timer_base+0x67/0x80
May 10 17:51:09 server kernel:  ? _raw_spin_unlock_irqrestore+0x20/0x40
May 10 17:51:09 server kernel:  kjournald2+0xc0/0x270 [jbd2]
May 10 17:51:09 server kernel:  ? __wake_up_common+0x77/0x140
May 10 17:51:09 server kernel:  ? wait_woken+0x80/0x80
May 10 17:51:09 server kernel:  ? commit_timeout+0x10/0x10 [jbd2]
May 10 17:51:09 server kernel:  kthread+0x112/0x130
May 10 17:51:09 server kernel:  ? kthread_park+0x80/0x80
May 10 17:51:09 server kernel:  ret_from_fork+0x35/0x40

May 10 17:51:09 server kernel: INFO: task ext4lazyinit:500 blocked for
more than 120 seconds.
May 10 17:51:09 server kernel:       Not tainted 5.0.13-arch1-1-ARCH #1
May 10 17:51:09 server kernel: "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
May 10 17:51:09 server kernel: ext4lazyinit    D    0   500      2 0x80000080
May 10 17:51:09 server kernel: Call Trace:
May 10 17:51:09 server kernel:  ? __schedule+0x30b/0x8b0
May 10 17:51:09 server kernel:  ? __wake_up_common_lock+0x89/0xc0
May 10 17:51:09 server kernel:  schedule+0x32/0x80
May 10 17:51:09 server kernel:  schedule_timeout+0x311/0x4a0
May 10 17:51:09 server kernel:  ? blk_flush_plug_list+0xb1/0xf0
May 10 17:51:09 server kernel:  io_schedule_timeout+0x19/0x40
May 10 17:51:09 server kernel:  wait_for_common_io.constprop.2+0x9f/0x130
May 10 17:51:09 server kernel:  ? wake_up_q+0x70/0x70
May 10 17:51:09 server kernel:  submit_bio_wait+0x5b/0x80
May 10 17:51:09 server kernel:  blkdev_issue_zeroout+0x142/0x220
May 10 17:51:09 server kernel:  ext4_init_inode_table+0x17d/0x390 [ext4]
May 10 17:51:09 server kernel:  ext4_lazyinit_thread+0x2ae/0x390 [ext4]
May 10 17:51:09 server kernel:  ?
ext4_unregister_li_request.isra.13+0x60/0x60 [ext4]
May 10 17:51:09 server kernel:  kthread+0x112/0x130
May 10 17:51:09 server kernel:  ? kthread_park+0x80/0x80
May 10 17:51:09 server kernel:  ret_from_fork+0x35/0x40

May 10 17:51:09 server kernel: INFO: task rsync:1728 blocked for more
than 120 seconds.
May 10 17:51:09 server kernel:       Not tainted 5.0.13-arch1-1-ARCH #1
May 10 17:51:09 server kernel: "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
May 10 17:51:09 server kernel: rsync           D    0  1728   1727 0x00000080
May 10 17:51:09 server kernel: Call Trace:
May 10 17:51:09 server kernel:  ? __schedule+0x30b/0x8b0
May 10 17:51:09 server kernel:  ? bit_wait+0x50/0x50
May 10 17:51:09 server kernel:  schedule+0x32/0x80
May 10 17:51:09 server kernel:  io_schedule+0x12/0x40
May 10 17:51:09 server kernel:  bit_wait_io+0xd/0x50
May 10 17:51:09 server kernel:  __wait_on_bit_lock+0x5d/0xa0
May 10 17:51:09 server kernel:  out_of_line_wait_on_bit_lock+0x91/0xb0
May 10 17:51:09 server kernel:  ? init_wait_var_entry+0x40/0x40
May 10 17:51:09 server kernel:  do_get_write_access+0x1f6/0x530 [jbd2]
May 10 17:51:09 server kernel:  ? ext4_dirty_inode+0x46/0x60 [ext4]
May 10 17:51:09 server kernel:  jbd2_journal_get_write_access+0x2c/0x50 [jbd2]
May 10 17:51:09 server kernel:  __ext4_journal_get_write_access+0x2c/0x70 [ext4]
May 10 17:51:09 server kernel:  ext4_reserve_inode_write+0x96/0xc0 [ext4]
May 10 17:51:09 server kernel:  ext4_mark_inode_dirty+0x4e/0x1d0 [ext4]
May 10 17:51:09 server kernel:  ext4_dirty_inode+0x46/0x60 [ext4]
May 10 17:51:09 server kernel:  __mark_inode_dirty+0x41/0x3e0
May 10 17:51:09 server kernel:  ext4_setattr+0x380/0xad0 [ext4]
May 10 17:51:09 server kernel:  notify_change+0x269/0x440
May 10 17:51:09 server kernel:  utimes_common.isra.0+0xdf/0x1b0
May 10 17:51:09 server kernel:  do_utimes+0xeb/0x160
May 10 17:51:09 server kernel:  __se_sys_utimensat+0x76/0xc0
May 10 17:51:09 server kernel:  do_syscall_64+0x5b/0x170
May 10 17:51:09 server kernel:  entry_SYSCALL_64_after_hwframe+0x44/0xa9
May 10 17:51:09 server kernel: RIP: 0033:0x7f939757cb43
May 10 17:51:09 server kernel: Code: Bad RIP value.
May 10 17:51:09 server kernel: RSP: 002b:00007ffff78cb998 EFLAGS:
00000206 ORIG_RAX: 0000000000000118
May 10 17:51:09 server kernel: RAX: ffffffffffffffda RBX:
00007ffff78cde50 RCX: 00007f939757cb43
May 10 17:51:09 server kernel: RDX: 00007ffff78cb9a0 RSI:
00007ffff78cde50 RDI: 00000000ffffff9c
May 10 17:51:09 server kernel: RBP: 000000002f5265f0 R08:
0000000000000000 R09: 000055b37a77d7a0
May 10 17:51:09 server kernel: R10: 0000000000000100 R11:
0000000000000206 R12: 00000000000041c0
May 10 17:51:09 server kernel: R13: 00007ffff78cbd20 R14:
000055b37a6a9368 R15: 0000000000000000

May 10 17:51:09 server kernel: INFO: task rsync:1729 blocked for more
than 120 seconds.
May 10 17:51:09 server kernel:       Not tainted 5.0.13-arch1-1-ARCH #1
May 10 17:51:09 server kernel: "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
May 10 17:51:09 server kernel: rsync           D    0  1729   1728 0x00000080
May 10 17:51:09 server kernel: Call Trace:
May 10 17:51:09 server kernel:  ? __schedule+0x30b/0x8b0
May 10 17:51:09 server kernel:  schedule+0x32/0x80
May 10 17:51:09 server kernel:  wait_transaction_locked+0x87/0xc0 [jbd2]
May 10 17:51:09 server kernel:  ? wait_woken+0x80/0x80
May 10 17:51:09 server kernel:  add_transaction_credits+0xd8/0x290 [jbd2]
May 10 17:51:09 server kernel:  ? ext4_dirty_inode+0x46/0x60 [ext4]
May 10 17:51:09 server kernel:  start_this_handle+0x104/0x450 [jbd2]
May 10 17:51:09 server kernel:  ? find_get_entry+0x116/0x180
May 10 17:51:09 server kernel:  jbd2__journal_start+0xd9/0x200 [jbd2]
May 10 17:51:09 server kernel:  ext4_da_write_begin+0x199/0x480 [ext4]
May 10 17:51:09 server kernel:  generic_perform_write+0xb7/0x1c0
May 10 17:51:09 server kernel:  ? file_update_time+0x5e/0x130
May 10 17:51:09 server kernel:  __generic_file_write_iter+0xfa/0x1c0
May 10 17:51:09 server kernel:  ? generic_write_checks+0x4c/0xb0
May 10 17:51:09 server kernel:  ext4_file_write_iter+0xc6/0x3f0 [ext4]
May 10 17:51:09 server kernel:  __vfs_write+0x14d/0x1b0
May 10 17:51:09 server kernel:  vfs_write+0xa9/0x1a0
May 10 17:51:09 server kernel:  ksys_write+0x4f/0xb0
May 10 17:51:09 server kernel:  do_syscall_64+0x5b/0x170
May 10 17:51:09 server kernel:  entry_SYSCALL_64_after_hwframe+0x44/0xa9
May 10 17:51:09 server kernel: RIP: 0033:0x7f9397577cc8
May 10 17:51:09 server kernel: Code: Bad RIP value.
May 10 17:51:09 server kernel: RSP: 002b:00007ffff78cac18 EFLAGS:
00000246 ORIG_RAX: 0000000000000001
May 10 17:51:09 server kernel: RAX: ffffffffffffffda RBX:
0000000000000000 RCX: 00007f9397577cc8
May 10 17:51:09 server kernel: RDX: 0000000000000400 RSI:
000055b379198e50 RDI: 0000000000000001
May 10 17:51:09 server kernel: RBP: 0000000000000400 R08:
0000000000000400 R09: 00000000a2b05d8a
May 10 17:51:09 server kernel: R10: 00000000f5111859 R11:
0000000000000246 R12: 000055b379198e50
May 10 17:51:09 server kernel: R13: 000055b379198e50 R14:
0000000000003400 R15: 0000000000000400

May 10 17:51:09 server kernel: INFO: task kworker/u8:1:21252 blocked
for more than 120 seconds.
May 10 17:51:09 server kernel:       Not tainted 5.0.13-arch1-1-ARCH #1
May 10 17:51:09 server kernel: "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
May 10 17:51:09 server kernel: kworker/u8:1    D    0 21252      2 0x80000080
May 10 17:51:09 server kernel: Workqueue: writeback wb_workfn (flush-9:0)
May 10 17:51:09 server kernel: Call Trace:
May 10 17:51:09 server kernel:  ? __schedule+0x30b/0x8b0
May 10 17:51:09 server kernel:  ? bit_wait+0x50/0x50
May 10 17:51:09 server kernel:  schedule+0x32/0x80
May 10 17:51:09 server kernel:  io_schedule+0x12/0x40
May 10 17:51:09 server kernel:  bit_wait_io+0xd/0x50
May 10 17:51:09 server kernel:  __wait_on_bit_lock+0x5d/0xa0
May 10 17:51:09 server kernel:  out_of_line_wait_on_bit_lock+0x91/0xb0
May 10 17:51:09 server kernel:  ? init_wait_var_entry+0x40/0x40
May 10 17:51:09 server kernel:  do_get_write_access+0x1f6/0x530 [jbd2]
May 10 17:51:09 server kernel:  jbd2_journal_get_write_access+0x2c/0x50 [jbd2]
May 10 17:51:09 server kernel:  __ext4_journal_get_write_access+0x2c/0x70 [ext4]
May 10 17:51:09 server kernel:  ? ext4_read_block_bitmap+0x14/0x50 [ext4]
May 10 17:51:09 server kernel:  ext4_mb_mark_diskspace_used+0x9c/0x490 [ext4]
May 10 17:51:09 server kernel:  ext4_mb_new_blocks+0x2a2/0xb70 [ext4]
May 10 17:51:09 server kernel:  ? __kmalloc+0x188/0x210
May 10 17:51:09 server kernel:  ? ext4_find_extent+0x272/0x300 [ext4]
May 10 17:51:09 server kernel:  ? ext4_find_extent+0x272/0x300 [ext4]
May 10 17:51:09 server kernel:  ext4_ext_map_blocks+0xbd3/0x12b0 [ext4]
May 10 17:51:09 server kernel:  ? nr_free_zone_pages+0x80/0x90
May 10 17:51:09 server kernel:  ext4_map_blocks+0xed/0x5c0 [ext4]
May 10 17:51:09 server kernel:  ext4_writepages+0xa20/0xf50 [ext4]
May 10 17:51:09 server kernel:  ? generic_writepages+0x61/0x90
May 10 17:51:09 server kernel:  ? __switch_to_asm+0x35/0x70
May 10 17:51:09 server kernel:  ? do_writepages+0x41/0xd0
May 10 17:51:09 server kernel:  ? ext4_mark_inode_dirty+0x1d0/0x1d0 [ext4]
May 10 17:51:09 server kernel:  do_writepages+0x41/0xd0
May 10 17:51:09 server kernel:  ? _raw_spin_unlock_irq+0x1d/0x30
May 10 17:51:09 server kernel:  ? finish_task_switch+0x84/0x2d0
May 10 17:51:09 server kernel:  ? __switch_to_asm+0x40/0x70
May 10 17:51:09 server kernel:  ? preempt_count_add+0x79/0xb0
May 10 17:51:09 server kernel:  __writeback_single_inode+0x3d/0x3c0
May 10 17:51:09 server kernel:  ? _raw_spin_lock+0x13/0x30
May 10 17:51:09 server kernel:  writeback_sb_inodes+0x1e8/0x4c0
May 10 17:51:09 server kernel:  __writeback_inodes_wb+0x5d/0xb0
May 10 17:51:09 server kernel:  wb_writeback+0x28f/0x340
May 10 17:51:09 server kernel:  ? 0xffffffff9a000000
May 10 17:51:09 server kernel:  ? cpumask_next+0x16/0x20
May 10 17:51:09 server kernel:  wb_workfn+0x35d/0x430
May 10 17:51:09 server kernel:  process_one_work+0x1eb/0x410
May 10 17:51:09 server kernel:  worker_thread+0x2d/0x3d0
May 10 17:51:09 server kernel:  ? process_one_work+0x410/0x410
May 10 17:51:09 server kernel:  kthread+0x112/0x130
May 10 17:51:09 server kernel:  ? kthread_park+0x80/0x80
May 10 17:51:09 server kernel:  ret_from_fork+0x35/0x40



May 10 17:53:11 server kernel: INFO: task md0_raid1:435 blocked for
more than 120 seconds.
May 10 17:53:11 server kernel:       Not tainted 5.0.13-arch1-1-ARCH #1
May 10 17:53:11 server kernel: "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
May 10 17:53:11 server kernel: md0_raid1       D    0   435      2 0x80000080
May 10 17:53:11 server kernel: Call Trace:
May 10 17:53:11 server kernel:  ? __schedule+0x30b/0x8b0
May 10 17:53:11 server kernel:  ? preempt_count_add+0x79/0xb0
May 10 17:53:11 server kernel:  schedule+0x32/0x80
May 10 17:53:11 server kernel:  md_super_wait+0x69/0xa0 [md_mod]
May 10 17:53:11 server kernel:  ? wait_woken+0x80/0x80
May 10 17:53:11 server kernel:  md_bitmap_wait_writes+0x8e/0xa0 [md_mod]
May 10 17:53:11 server kernel:  md_bitmap_unplug+0xf9/0x110 [md_mod]
May 10 17:53:11 server kernel:  flush_bio_list+0x1e/0xe0 [raid1]
May 10 17:53:11 server kernel:  flush_pending_writes+0x81/0xc0 [raid1]
May 10 17:53:11 server kernel:  raid1d+0xa3/0x12d0 [raid1]
May 10 17:53:11 server kernel:  ? preempt_count_add+0x79/0xb0
May 10 17:53:11 server kernel:  ? _raw_spin_lock_irqsave+0x25/0x50
May 10 17:53:11 server kernel:  ? lock_timer_base+0x67/0x80
May 10 17:53:11 server kernel:  ? _raw_spin_unlock_irqrestore+0x20/0x40
May 10 17:53:11 server kernel:  ? try_to_del_timer_sync+0x4d/0x80
May 10 17:53:11 server kernel:  ? md_register_thread+0xd0/0xd0 [md_mod]
May 10 17:53:11 server kernel:  ? md_thread+0xf9/0x160 [md_mod]
May 10 17:53:11 server kernel:  ? abort_sync_write.isra.5+0x70/0x70 [raid1]
May 10 17:53:11 server kernel:  md_thread+0xf9/0x160 [md_mod]
May 10 17:53:11 server kernel:  ? wait_woken+0x80/0x80
May 10 17:53:11 server kernel:  kthread+0x112/0x130
May 10 17:53:11 server kernel:  ? kthread_park+0x80/0x80
May 10 17:53:11 server kernel:  ret_from_fork+0x35/0x40

May 10 17:53:11 server kernel: INFO: task md0_resync:443 blocked for
more than 120 seconds.
May 10 17:53:11 server kernel:       Not tainted 5.0.13-arch1-1-ARCH #1
May 10 17:53:11 server kernel: "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
May 10 17:53:11 server kernel: md0_resync      D    0   443      2 0x80000080
May 10 17:53:11 server kernel: Call Trace:
May 10 17:53:11 server kernel:  ? __schedule+0x30b/0x8b0
May 10 17:53:11 server kernel:  schedule+0x32/0x80
May 10 17:53:11 server kernel:  raid1_sync_request+0x97f/0xb90 [raid1]
May 10 17:53:11 server kernel:  ? is_mddev_idle+0xbe/0x137 [md_mod]
May 10 17:53:11 server kernel:  ? wait_woken+0x80/0x80
May 10 17:53:11 server kernel:  md_do_sync.cold.53+0x43c/0x98f [md_mod]
May 10 17:53:11 server kernel:  ? 0xffffffff9a000000
May 10 17:53:11 server kernel:  ? __switch_to_asm+0x34/0x70
May 10 17:53:11 server kernel:  ? wait_woken+0x80/0x80
May 10 17:53:11 server kernel:  ? _raw_spin_unlock_irq+0x1d/0x30
May 10 17:53:11 server kernel:  ? md_register_thread+0xd0/0xd0 [md_mod]
May 10 17:53:11 server kernel:  md_thread+0xf9/0x160 [md_mod]
May 10 17:53:11 server kernel:  ? preempt_count_add+0x79/0xb0
May 10 17:53:11 server kernel:  ? _raw_spin_lock_irqsave+0x25/0x50
May 10 17:53:11 server kernel:  ? _raw_spin_unlock_irqrestore+0x20/0x40
May 10 17:53:11 server kernel:  kthread+0x112/0x130
May 10 17:53:11 server kernel:  ? kthread_park+0x80/0x80
May 10 17:53:11 server kernel:  ret_from_fork+0x35/0x40

May 10 17:53:11 server kernel: INFO: task jbd2/md0-8:498 blocked for
more than 120 seconds.
May 10 17:53:11 server kernel:       Not tainted 5.0.13-arch1-1-ARCH #1
May 10 17:53:11 server kernel: "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
May 10 17:53:11 server kernel: jbd2/md0-8      D    0   498      2 0x80000080
May 10 17:53:11 server kernel: Call Trace:
May 10 17:53:11 server kernel:  ? __schedule+0x30b/0x8b0
May 10 17:53:11 server kernel:  ? __wake_up_common_lock+0x89/0xc0
May 10 17:53:11 server kernel:  ? wait_woken+0x80/0x80
May 10 17:53:11 server kernel:  schedule+0x32/0x80
May 10 17:53:11 server kernel:
jbd2_journal_commit_transaction+0x250/0x18c0 [jbd2]
May 10 17:53:11 server kernel:  ? __switch_to_asm+0x40/0x70
May 10 17:53:11 server kernel:  ? __switch_to_asm+0x34/0x70
May 10 17:53:11 server kernel:  ? __switch_to_asm+0x40/0x70
May 10 17:53:11 server kernel:  ? __switch_to_asm+0x40/0x70
May 10 17:53:11 server kernel:  ? __switch_to_asm+0x40/0x70
May 10 17:53:11 server kernel:  ? __switch_to_asm+0x34/0x70
May 10 17:53:11 server kernel:  ? __switch_to_asm+0x34/0x70
May 10 17:53:11 server kernel:  ? __switch_to_asm+0x40/0x70
May 10 17:53:11 server kernel:  ? __switch_to_asm+0x34/0x70
May 10 17:53:11 server kernel:  ? __switch_to_asm+0x34/0x70
May 10 17:53:11 server kernel:  ? wait_woken+0x80/0x80
May 10 17:53:11 server kernel:  ? preempt_count_add+0x79/0xb0
May 10 17:53:11 server kernel:  ? lock_timer_base+0x67/0x80
May 10 17:53:11 server kernel:  ? _raw_spin_unlock_irqrestore+0x20/0x40
May 10 17:53:11 server kernel:  kjournald2+0xc0/0x270 [jbd2]
May 10 17:53:11 server kernel:  ? __wake_up_common+0x77/0x140
May 10 17:53:11 server kernel:  ? wait_woken+0x80/0x80
May 10 17:53:11 server kernel:  ? commit_timeout+0x10/0x10 [jbd2]
May 10 17:53:11 server kernel:  kthread+0x112/0x130
May 10 17:53:11 server kernel:  ? kthread_park+0x80/0x80
May 10 17:53:11 server kernel:  ret_from_fork+0x35/0x40

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2019-05-11  6:58 md raid hangs when using multi-queue schedulers Piotr Gabriel Kosinski

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