linux-ext4 - Re: [BUG] xfstest269 causes deadlock on linux-3.9.0 (ext4)

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Date:	Wed, 15 May 2013 11:57:28 +0900
From:	Akira Fujita <a-fujita@...jp.nec.com>
To:	Jan Kara <jack@...e.cz>
CC:	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: [BUG] xfstest269 causes deadlock on linux-3.9.0 (ext4)

Hi,

(2013/05/15 6:37), Jan Kara wrote:
>    Hello,
> 
> On Mon 13-05-13 15:49:24, Akira Fujita wrote:
>> I ran into the deaclock with xfs_test 269 on linux-3.9.0.
>> It seems happen between jbd2_log_wait_commit, sleep_on_buffer
>> and writeback_indoes (Please see ps log below).
>> Once it occurs we can't touch FS anymore.
>> In my case 300 - 1000 trials to occur. Is this known issue?
>>
>> The following kernels seems to have same problem:
>> - linux-3.5-rc5
>> - linux-3.8.5
>> - linux-3.9-rc7
>> And now I'm trying it on linux-3.10-rc1.
>>
>> # ./check generic/269
>> FSTYP         -- ext4
>> PLATFORM      -- Linux/x86_64 mcds1 3.9.0
>> MKFS_OPTIONS  -- /dev/sda12
>> MOUNT_OPTIONS -- -o acl,user_xattr /dev/sda12 /mnt/mp2
>>
>>
>> # ps -eo pid,tid,class,rtprio,ni,pri,psr,pcpu,stat,wchan:16,comm
>>    PID   TID CLS RTPRIO  NI PRI PSR %CPU STAT WCHAN            COMMAND
>>      1     1 TS       -   0  19   0  0.0 Ss   poll_schedule_ti init
>>      2     2 TS       -   0  19   0  0.0 S    kthreadd         kthreadd
>>      3     3 TS       -   0  19   0  0.0 S    smpboot_thread_f ksoftirqd/0
>> ...
>>   2391  2391 TS       -   0  19   2  0.1 D    jbd2_log_wait_co flush-8:0
>> ...
>> 22647 22647 TS       -   0  19   3  0.0 S    worker_thread    kworker/3:1
>> 22655 22655 TS       -   0  19   0  0.0 S    hrtimer_nanoslee sleep
>> 22657 22657 TS       -   0  19   2  0.0 R+   -                ps
>> 25330 25330 TS       -   0  19   0  0.0 S    worker_thread    kworker/0:0
>> 28963 28963 TS       -   0  19   1  0.0 S+   wait             loop_xfstests.s
>> 28964 28964 TS       -   0  19   1  0.0 S+   wait             check
>> 29180 29180 TS       -   0  19   3  0.0 S    kjournald2       jbd2/sda11-8
>> 29181 29181 TS       - -20  39   3  0.0 S<   rescuer_thread   ext4-dio-unwrit
>> 29199 29199 TS       -   0  19   3  0.0 S+   wait             269
>> 29391 29391 TS       -   0  19   0  0.6 D    sleep_on_buffer  jbd2/sda12-8
>> 29392 29392 TS       - -20  39   3  0.0 S<   rescuer_thread   ext4-dio-unwrit
>> 29394 29394 TS       -   0  19   0  0.0 S    wait             fsstress
>> 29505 29505 TS       -   0  19   3  0.0 D    writeback_inodes fsstress
>>
>> # df -T /dev/sda11 /dev/sda12
>> Filesystem    Type   1K-blocks      Used Available Use% Mounted on
>> /dev/sda11    ext4     9857264     22308   9327564   1% /mnt/mp1
>> /dev/sda12    ext4      499656    499656         0 100% /mnt/mp2
>    Thanks for report. No I don't think this problem has been reported
> before. Seeing that sda12 is out of space and fsstress hangs in
> writeback_inodes(), I suspect we have some deadlock in ENOSPC recovery path
> when we want to flush data to disk to reduce delalloc uncertainty. Can you
> run 'echo w >/proc/sysrq-trigger' when the deadlock happens and post your
> dmesg here? Thanks!
> 

Thanks for reply.
I'll take that information when the deadlock happens again.

Regards,
Akira Fujita

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