possible memory allocation deadlock in xfs_buf_allocate_memory

[Christian Kujau]

Hi,

since Linux 3.5 I'm seeing these "inconsistent lock state" lockdep 
warnings [0]. They show up in 3.6 as well [1]. I was being told[2] that I 
may have run out of inode attributes. This may well be the case, but I 
cannot reformat the disk right now and will have to live with that warning 
a while longer.

I got the warning again today, but 8h later the system hung and eventually 
shutdown. The last message from the box was received via netconsole:

 XFS: possible memory allocation deadlock in xfs_buf_allocate_memory (mode:0x250)

This has been reported[3] for 3.2.1, but when the message was printed I 
was not around and could not watch /proc/slabinfo.

The last -MARK- message (some kind of heartbeat message from syslog, 
printing "MARK" every 5min) has been received 07:55 local time, the
netconsole message above was received 08:09, so two -MARK- messages were 
lost. sar(1) stopped recording at 08:05.

These two incidents (the lockdep warning and the final lockup) may be 
unrelated (and timestamp-wise, they seem to be), but I thought I'd 
better report it.

Full dmesg and .config: http://nerdbynature.de/bits/3.6.0/xfs/

Thanks,
Christian.

[0] http://oss.sgi.com/archives/xfs/2012-07/msg00113.html
[1] http://oss.sgi.com/archives/xfs/2012-09/msg00305.html
[2] http://oss.sgi.com/archives/xfs/2012-07/msg00116.html
[3] http://oss.sgi.com/archives/xfs/2012-06/msg00362.html
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