Re: btrfs call trace

Hi Stefan,

I haven't seen this one.  The async commit stuff is mine, but there 
haven't been problems with it for a year or more.  This is a recent 
kernel, I assume? 

Can you dump the other tasks?  Something is preventing the commit from 
completing.

[adding linux-btrfs to cc]

sage


On Fri, 22 Jun 2012, Stefan Priebe wrote:

Hi,

are these bugs known?

[ 2157.104532] INFO: task kworker/2:2:6278 blocked for more than 120 seconds.
[ 2157.130649] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 2157.156750] kworker/2:2     D ffffffff8180eba0     0  6278      2
0x00000000
[ 2157.182763]  ffff880c3c0d7c90 0000000000000046 ffff880c3e2aa1c0
0000000000012280
[ 2157.208662]  ffff880c3c0d7fd8 ffff880c3c0d6010 0000000000012280
0000000000012280
[ 2157.234591]  ffff880c3c0d7fd8 0000000000012280 ffff880e78e5a240
ffff880c3e2aa1c0
[ 2157.260573] Call Trace:
[ 2157.285872]  [<ffffffff81620334>] schedule+0x24/0x70
[ 2157.311097]  [<ffffffffa007f4e5>] wait_for_commit+0x55/0x90 [btrfs]
[ 2157.311106]  [<ffffffff81060140>] ? wake_up_bit+0x40/0x40
[ 2157.311129]  [<ffffffffa00810b5>] btrfs_commit_transaction+0x655/0xab0
[btrfs]
[ 2157.311134]  [<ffffffff810736f0>] ? set_next_entity+0x90/0xa0
[ 2157.311138]  [<ffffffff81060140>] ? wake_up_bit+0x40/0x40
[ 2157.311156]  [<ffffffffa0081810>] ? btrfs_end_transaction+0x20/0x20 [btrfs]
[ 2157.311171]  [<ffffffffa008182a>] do_async_commit+0x1a/0x30 [btrfs]
[ 2157.311175]  [<ffffffff81058eff>] process_one_work+0x11f/0x470
[ 2157.311179]  [<ffffffff8105b128>] worker_thread+0x178/0x400
[ 2157.311182]  [<ffffffff8105afb0>] ? manage_workers+0x210/0x210
[ 2157.311185]  [<ffffffff8105fc46>] kthread+0x96/0xa0
[ 2157.311190]  [<ffffffff81622dd4>] kernel_thread_helper+0x4/0x10
[ 2157.311195]  [<ffffffff8105fbb0>] ? kthread_worker_fn+0x130/0x130
[ 2157.311198]  [<ffffffff81622dd0>] ? gs_change+0xb/0xb
[ 2157.311220] INFO: task ceph-osd:14426 blocked for more than 120 seconds.
[ 2157.311220] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 2157.311224] ceph-osd        D 0000000000000002     0 14426      1
0x00000000
[ 2157.311228]  ffff880ae8c33c38 0000000000000082 ffff880a39142180
0000000000012280
[ 2157.311231]  ffff880ae8c33fd8 ffff880ae8c32010 0000000000012280
0000000000012280
[ 2157.311234]  ffff880ae8c33fd8 0000000000012280 ffff880983efa1c0
ffff880a39142180
[ 2157.311235] Call Trace:
[ 2157.311240]  [<ffffffff81620334>] schedule+0x24/0x70
[ 2157.311256]  [<ffffffffa0081d85>]
btrfs_commit_transaction_async+0x1d5/0x240 [btrfs]
[ 2157.311271]  [<ffffffffa0065eb6>] ? block_rsv_add_bytes+0x26/0x60 [btrfs]
[ 2157.311275]  [<ffffffff81060140>] ? wake_up_bit+0x40/0x40
[ 2157.311289]  [<ffffffffa0065f25>] ? block_rsv_migrate_bytes+0x35/0x50
[btrfs]
[ 2157.311311]  [<ffffffffa00b2d5e>] btrfs_mksubvol+0x2be/0x350 [btrfs]
[ 2157.311329]  [<ffffffffa00b2ef9>]
btrfs_ioctl_snap_create_transid+0x109/0x1a0 [btrfs]
[ 2157.311346]  [<ffffffffa00b4bf4>] btrfs_ioctl_snap_create_v2+0x84/0xf0
[btrfs]
[ 2157.311363]  [<ffffffffa00b756f>] btrfs_ioctl+0x76f/0x12d0 [btrfs]
[ 2157.311368]  [<ffffffff8114459a>] ? fsnotify+0x1ba/0x2e0
[ 2157.311372]  [<ffffffff8111ade3>] do_vfs_ioctl+0x93/0x4f0
[ 2157.311375]  [<ffffffff8111b28a>] sys_ioctl+0x4a/0x80
[ 2157.311379]  [<ffffffff81621ba2>] system_call_fastpath+0x16/0x1b

Stefan
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