Re: btrfs: convert metadata from raid5 to raid1

Menion
2020-02-18T08:43:25Z

[578688.840150] sysrq: Show Blocked State
[578688.840184] task PC stack pid father

but as said I completed the balance yesterday

Il giorno mar 18 feb 2020 alle ore 09:41 Nikolay Borisov
<nborisov@suse.com> ha scritto:
>
>
>
> On 18.02.20 г. 10:34 ч., Menion wrote:
> > Hello again
> >
> > Task completed, I see in three occurrence of this event:
> >
> > [518366.156963] INFO: task btrfs-cleaner:1034 blocked for more than 120 seconds.
> > [518366.156989] Not tainted 5.5.3-050503-generic #202002110832
> > [518366.157024] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
> > disables this message.
> > [518366.157044] btrfs-cleaner D 0 1034 2 0x80004000
> > [518366.157054] Call Trace:
> > [518366.157082] __schedule+0x2d8/0x760
> > [518366.157094] schedule+0x55/0xc0
> > [518366.157105] schedule_preempt_disabled+0xe/0x10
> > [518366.157113] __mutex_lock.isra.0+0x182/0x4f0
> > [518366.157125] __mutex_lock_slowpath+0x13/0x20
> > [518366.157132] mutex_lock+0x2e/0x40
> > [518366.157261] btrfs_delete_unused_bgs+0xc0/0x560 [btrfs]
> > [518366.157322] ? __wake_up+0x13/0x20
> > [518366.157424] cleaner_kthread+0x124/0x130 [btrfs]
> > [518366.157437] kthread+0x104/0x140
> > [518366.157531] ? kzalloc.constprop.0+0x40/0x40 [btrfs]
> > [518366.157565] ? kthread_park+0x90/0x90
> > [518366.157575] ret_from_fork+0x35/0x40
> >
> > and
> >
> > [518486.984177] INFO: task btrfs-cleaner:1034 blocked for more than 241 seconds.
> > [518486.984204] Not tainted 5.5.3-050503-generic #202002110832
> > [518486.984216] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
> > disables this message.
> > [518486.984233] btrfs-cleaner D 0 1034 2 0x80004000
> > [518486.984243] Call Trace:
> > [518486.984271] __schedule+0x2d8/0x760
> > [518486.984284] schedule+0x55/0xc0
> > [518486.984295] schedule_preempt_disabled+0xe/0x10
> > [518486.984305] __mutex_lock.isra.0+0x182/0x4f0
> > [518486.984319] __mutex_lock_slowpath+0x13/0x20
> > [518486.984326] mutex_lock+0x2e/0x40
> > [518486.984451] btrfs_delete_unused_bgs+0xc0/0x560 [btrfs]
> > [518486.984464] ? __wake_up+0x13/0x20
> > [518486.984562] cleaner_kthread+0x124/0x130 [btrfs]
> > [518486.984573] kthread+0x104/0x140
> > [518486.984666] ? kzalloc.constprop.0+0x40/0x40 [btrfs]
> > [518486.984675] ? kthread_park+0x90/0x90
> > [518486.984686] ret_from_fork+0x35/0x40
> >
> > and
> >
> > [518728.646379] INFO: task btrfs-cleaner:1034 blocked for more than 120 seconds.
> > [518728.646413] Not tainted 5.5.3-050503-generic #202002110832
> > [518728.646428] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
> > disables this message.
> > [518728.646447] btrfs-cleaner D 0 1034 2 0x80004000
> > [518728.646460] Call Trace:
> > [518728.646494] __schedule+0x2d8/0x760
> > [518728.646508] schedule+0x55/0xc0
> > [518728.646522] schedule_preempt_disabled+0xe/0x10
> > [518728.646534] __mutex_lock.isra.0+0x182/0x4f0
> > [518728.646550] __mutex_lock_slowpath+0x13/0x20
> > [518728.646559] mutex_lock+0x2e/0x40
> > [518728.646719] btrfs_delete_unused_bgs+0xc0/0x560 [btrfs]
> > [518728.646735] ? __wake_up+0x13/0x20
> > [518728.646859] cleaner_kthread+0x124/0x130 [btrfs]
> > [518728.646875] kthread+0x104/0x140
> > [518728.647019] ? kzalloc.constprop.0+0x40/0x40 [btrfs]
> > [518728.647031] ? kthread_park+0x90/0x90
> > [518728.647045] ret_from_fork+0x35/0x40
> >
> > Is it a kind of normal?
> > Thanks, bye
>
>
> provide the output of echo w > /proc/sysrq-trigger
>
> I suspect there were 3 times that there was lock contention on
> delete_unused_bgs_mutex due to balance. Unless it persists it's fine.