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From: Dave Jones [davej@xxxxxxxxxx]
Sent: Friday, June 04, 2010 1:03 PM
To: Pittigher, Raymond - ES
Cc: kernel@xxxxxxxxxxxxxxxxxxxxxxx
Subject: Re: slab oom
On Fri, Jun 04, 2010 at 12:46:17PM -0400, Pittigher, Raymond - ES wrote:
> Started to see these messages in the log files. After a while the slab cache uses all the memory then OOM. Memory leak someplace?
>
>
> May 27 19:48:06 suoserv4 kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disable
> s this message.
> May 27 19:48:06 suoserv4 kernel: nfsd D ffff81000103f1a0 0 4562 1
> 4563 4561 (L-TLB)
> May 27 19:48:06 suoserv4 kernel: ffff810c0d43bac0 0000000000000046 ffff810c0d43ba10 000000
> 0000000000
> May 27 19:48:06 suoserv4 kernel: ffff810c0d43ba58 000000000000000a ffff810c0e3a67a0 ffff81
> 0c2fce5100
> May 27 19:48:06 suoserv4 kernel: 0000142538fcf800 000000000000863d ffff810c0e3a6988 000000
> 07885df478
> May 27 19:48:06 suoserv4 kernel: Call Trace:
> May 27 19:48:06 suoserv4 kernel: [<ffffffff885ef19d>] :linuxshield:doScan+0x8e7/0xcff
> May 27 19:48:06 suoserv4 kernel: [<ffffffff800a1ba4>] autoremove_wake_function+0x0/0x2e
> May 27 19:48:06 suoserv4 kernel: [<ffffffff885ee4ce>] :linuxshield:cacheLookup+0x96/0x152
> May 27 19:48:06 suoserv4 kernel: [<ffffffff885f0332>] :linuxshield:SC_doScan+0x108/0x115
> May 27 19:48:06 suoserv4 kernel: [<ffffffff885ed625>] :linuxshield:openHook+0x138/0x1b7
> May 27 19:48:06 suoserv4 kernel: [<ffffffff885de9a3>] :lshook:invokeCallbacks+0x32a/0x4f7
my first guess would be 'linuxshield'.
This isn't actually an oom, it's complaining because a task stayed in kernel context for
a really long time. This can happen if for eg, an nfs server goes away for a while.
Or it could just be a side-effect of the way that mcaffee does their file scanning.
On the surface, this doesn't look like a linux bug.
Dave
This is a better pull from the logs on this issue. Just before the server does the OOM and shuts things down I see
kernel: nfsd: peername failed (err 107)!
kernel: nfsd: peername failed (err 107)!
kernel: rpc-srv/tcp: lockd: got error -104 when sending 40 bytes - shutting down socket
kernel: nfsd: peername failed (err 107)!
Then at this point everything is down and no access, time to reboot. A problem with NFS in the kernel?
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