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Date: Mon, 13 May 2013 15:49:24 +0900
From: Akira Fujita <a-fujita@...jp.nec.com>
To: ext4 development <linux-ext4@...r.kernel.org>
Subject: [BUG] xfstest269 causes deadlock on linux-3.9.0 (ext4)
Hi,
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
# tail -f /var/log/messages
May 11 05:59:22 mcds1 root: run xfstest generic/269
May 11 05:59:23 mcds1 kernel: [60999.075705] EXT4-fs (sda12): mounted filesystem with ordered data mode. Opts: acl,user_xattr
May 11 06:01:41 mcds1 kernel: [61137.377958] EXT4-fs (sda11): warning: maximal mount count reached, running e2fsck is recommended
May 11 06:01:41 mcds1 kernel: [61137.378756] EXT4-fs (sda11): mounted filesystem with ordered data mode. Opts: acl,user_xattr
May 11 06:01:48 mcds1 kernel: [61144.673759] EXT4-fs (sda12): mounted filesystem with ordered data mode. Opts: acl,user_xattr
May 11 06:01:48 mcds1 kernel: [61144.882217] EXT4-fs (sda11): warning: maximal mount count reached, running e2fsck is recommended
May 11 06:01:48 mcds1 kernel: [61144.882799] EXT4-fs (sda11): mounted filesystem with ordered data mode. Opts: acl,user_xattr
May 11 06:01:48 mcds1 root: run xfstest generic/269
May 11 06:01:49 mcds1 kernel: [61145.444455] EXT4-fs (sda12): mounted filesystem with ordered data mode. Opts: acl,user_xattr
Regards,
Akira Fujita
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