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Subjectlinux 4.19.19: md0_raid:1317 blocked for more than 120 seconds.
Date
With 4.19.19 we see sometimes the following issue (practically only with blk_mq, though):

Feb 4 20:04:46 tettnang kernel: [252300.060165] INFO: task md0_raid1:317 blocked for more than 120 seconds.
Feb 4 20:04:46 tettnang kernel: [252300.060188] Not tainted 4.19.19-debian64.all+1.1 #1
Feb 4 20:04:46 tettnang kernel: [252300.060197] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Feb 4 20:04:46 tettnang kernel: [252300.060207] md0_raid1 D 0 317 2 0x80000000
Feb 4 20:04:46 tettnang kernel: [252300.060211] Call Trace:
Feb 4 20:04:46 tettnang kernel: [252300.060222] ? __schedule+0x2a2/0x8c0
Feb 4 20:04:46 tettnang kernel: [252300.060226] ? _raw_spin_unlock_irqrestore+0x20/0x40
Feb 4 20:04:46 tettnang kernel: [252300.060229] schedule+0x32/0x90
Feb 4 20:04:46 tettnang kernel: [252300.060241] md_super_wait+0x69/0xa0 [md_mod]
Feb 4 20:04:46 tettnang kernel: [252300.060247] ? finish_wait+0x80/0x80
Feb 4 20:04:46 tettnang kernel: [252300.060255] md_bitmap_wait_writes+0x8e/0xa0 [md_mod]
Feb 4 20:04:46 tettnang kernel: [252300.060263] ? md_bitmap_get_counter+0x42/0xd0 [md_mod]
Feb 4 20:04:46 tettnang kernel: [252300.060271] md_bitmap_daemon_work+0x1e8/0x380 [md_mod]
Feb 4 20:04:46 tettnang kernel: [252300.060278] ? md_rdev_init+0xb0/0xb0 [md_mod]
Feb 4 20:04:46 tettnang kernel: [252300.060285] md_check_recovery+0x26/0x540 [md_mod]
Feb 4 20:04:46 tettnang kernel: [252300.060290] raid1d+0x5c/0xf00 [raid1]
Feb 4 20:04:46 tettnang kernel: [252300.060294] ? preempt_count_add+0x79/0xb0
Feb 4 20:04:46 tettnang kernel: [252300.060298] ? lock_timer_base+0x67/0x80
Feb 4 20:04:46 tettnang kernel: [252300.060302] ? _raw_spin_unlock_irqrestore+0x20/0x40
Feb 4 20:04:46 tettnang kernel: [252300.060304] ? try_to_del_timer_sync+0x4d/0x80
Feb 4 20:04:46 tettnang kernel: [252300.060306] ? del_timer_sync+0x35/0x40
Feb 4 20:04:46 tettnang kernel: [252300.060309] ? schedule_timeout+0x17a/0x3b0
Feb 4 20:04:46 tettnang kernel: [252300.060312] ? preempt_count_add+0x79/0xb0
Feb 4 20:04:46 tettnang kernel: [252300.060315] ? _raw_spin_lock_irqsave+0x25/0x50
Feb 4 20:04:46 tettnang kernel: [252300.060321] ? md_rdev_init+0xb0/0xb0 [md_mod]
Feb 4 20:04:46 tettnang kernel: [252300.060327] ? md_thread+0xf9/0x160 [md_mod]
Feb 4 20:04:46 tettnang kernel: [252300.060330] ? r1bio_pool_alloc+0x20/0x20 [raid1]
Feb 4 20:04:46 tettnang kernel: [252300.060336] md_thread+0xf9/0x160 [md_mod]
Feb 4 20:04:46 tettnang kernel: [252300.060340] ? finish_wait+0x80/0x80
Feb 4 20:04:46 tettnang kernel: [252300.060344] kthread+0x112/0x130
Feb 4 20:04:46 tettnang kernel: [252300.060346] ? kthread_create_worker_on_cpu+0x70/0x70
Feb 4 20:04:46 tettnang kernel: [252300.060350] ret_from_fork+0x35/0x40

I saw that there was a similar problem with raid10 and an upstream patch

e820d55cb99dd93ac2dc949cf486bb187e5cd70d
md: fix raid10 hang issue caused by barrier
by Guoqing Jiang

I wonder if there is a similar fix needed for raid1?

Regards,
--
Wolfgang Walter
Studentenwerk München
Anstalt des öffentlichen Rechts

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