Re: [bug report] INFO: task mdX_resync:42168 blocked for more than 122 seconds

[Ming Lei <ming.lei@redhat.com>]

Cc raid and dm list.

On Thu, May 16, 2024 at 06:24:18PM +0800, Changhui Zhong wrote:
> Hello,
> 
> when create lvm raid1, the command hang on for a long time.
> please help check it and let me know if you need any info/testing for
> it, thanks.
> 
> repo:https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git
> branch:for-next
> commit: 59ef8180748269837975c9656b586daa16bb9def
> 
> reproducer:
> dd if=/dev/zero bs=1M count=2000 of=file0.img
> dd if=/dev/zero bs=1M count=2000 of=file1.img
> dd if=/dev/zero bs=1M count=2000 of=file2.img
> dd if=/dev/zero bs=1M count=2000 of=file4.img
> losetup -fP --show file0.img
> losetup -fP --show file1.img
> losetup -fP --show file2.img
> losetup -fP --show file3.img
> pvcreate -y  /dev/loop0 /dev/loop1 /dev/loop2 /dev/loop3
> vgcreate  black_bird  /dev/loop0 /dev/loop1 /dev/loop2 /dev/loop3
> lvcreate --type raid1 -m 3 -n non_synced_primary_raid_3legs_1   -L 1G
> black_bird        /dev/loop0:0-300     /dev/loop1:0-300
> /dev/loop2:0-300  /dev/loop3:0-300
> 
> 
> console log:
> May 21 21:57:41 dell-per640-04 journal: Create raid1
> May 21 21:57:41 dell-per640-04 kernel: device-mapper: raid:
> Superblocks created for new raid set
> May 21 21:57:42 dell-per640-04 kernel: md/raid1:mdX: not clean --
> starting background reconstruction
> May 21 21:57:42 dell-per640-04 kernel: md/raid1:mdX: active with 4 out
> of 4 mirrors
> May 21 21:57:42 dell-per640-04 kernel: mdX: bitmap file is out of
> date, doing full recovery
> May 21 21:57:42 dell-per640-04 kernel: md: resync of RAID array mdX
> May 21 21:57:42 dell-per640-04 systemd[1]: Started Device-mapper event daemon.
> May 21 21:57:42 dell-per640-04 dmeventd[42170]: dmeventd ready for processing.
> May 21 21:57:42 dell-per640-04 dmeventd[42170]: Monitoring RAID device
> black_bird-non_synced_primary_raid_3legs_1 for events.
> May 21 21:57:45 dell-per640-04 restraintd[1446]: *** Current Time: Tue
> May 21 21:57:45 2024  Localwatchdog at: Tue May 21 22:56:45 2024
> May 21 21:58:45 dell-per640-04 restraintd[1446]: *** Current Time: Tue
> May 21 21:58:45 2024  Localwatchdog at: Tue May 21 22:56:45 2024
> May 21 21:59:45 dell-per640-04 restraintd[1446]: *** Current Time: Tue
> May 21 21:59:45 2024  Localwatchdog at: Tue May 21 22:56:45 2024
> May 21 21:59:53 dell-per640-04 kernel: INFO: task mdX_resync:42168
> blocked for more than 122 seconds.
> May 21 21:59:53 dell-per640-04 kernel:      Not tainted 6.9.0+ #1
> May 21 21:59:53 dell-per640-04 kernel: "echo 0 >
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> May 21 21:59:53 dell-per640-04 kernel: task:mdX_resync      state:D
> stack:0     pid:42168 tgid:42168 ppid:2      flags:0x00004000
> May 21 21:59:53 dell-per640-04 kernel: Call Trace:
> May 21 21:59:53 dell-per640-04 kernel: <TASK>
> May 21 21:59:53 dell-per640-04 kernel: __schedule+0x222/0x670
> May 21 21:59:53 dell-per640-04 kernel: ? blk_mq_flush_plug_list+0x5/0x20
> May 21 21:59:53 dell-per640-04 kernel: schedule+0x2c/0xb0
> May 21 21:59:53 dell-per640-04 kernel: raise_barrier+0x107/0x200 [raid1]
> May 21 21:59:53 dell-per640-04 kernel: ?
> __pfx_autoremove_wake_function+0x10/0x10
> May 21 21:59:53 dell-per640-04 kernel: raid1_sync_request+0x12d/0xa50 [raid1]
> May 21 21:59:53 dell-per640-04 kernel: ?
> __pfx_raid1_sync_request+0x10/0x10 [raid1]
> May 21 21:59:53 dell-per640-04 kernel: md_do_sync+0x660/0x1040
> May 21 21:59:53 dell-per640-04 kernel: ?
> __pfx_autoremove_wake_function+0x10/0x10
> May 21 21:59:53 dell-per640-04 kernel: md_thread+0xad/0x160
> May 21 21:59:53 dell-per640-04 kernel: ? __pfx_md_thread+0x10/0x10
> May 21 21:59:53 dell-per640-04 kernel: kthread+0xdc/0x110
> May 21 21:59:53 dell-per640-04 kernel: ? __pfx_kthread+0x10/0x10
> May 21 21:59:53 dell-per640-04 kernel: ret_from_fork+0x2d/0x50
> May 21 21:59:53 dell-per640-04 kernel: ? __pfx_kthread+0x10/0x10
> May 21 21:59:53 dell-per640-04 kernel: ret_from_fork_asm+0x1a/0x30
> May 21 21:59:53 dell-per640-04 kernel: </TASK>
> 
> 
> --
> Best Regards,
>      Changhui
> 

-- 
Ming