Bug 62011

Summary:	[<ffffffffa070d1f3>] ? fscache_object_work_func+0xb3/0x1f0 [fscache] / BUG: unable to handle kernel NULL pointer dereference at 0000000000000002
Product:	File System	Reporter:	Raoul Bhatia (raoul)
Component:	Other	Assignee:	fs_other
Status:	NEW ---
Severity:	normal
Priority:	P1
Hardware:	IA-64
OS:	Linux
Kernel Version:	3.11.0	Subsystem:
Regression:	No	Bisected commit-id:
Attachments:	Missing w1a_oops_20130924.txt w1a_20130929_multiple_traces.txt wc01_20130930_multiple_traces.txt

Description Raoul Bhatia 2013-09-24 10:07:43 UTC

I encountered an kernel trace regarding Cachefilesd running 3.11.0-7-generic #13-Ubuntu SMP Tue Sep 10 20:55:38 UTC 2013 x86_64 GNU/Linux under Debian Squeeze 6.0.7 amd64 on an Opteron barebone.

This server is an NFS client using cachefilesd.

The NFS server is Debian Squeeze 6.0.7 amd64 running 3.2.0-0.bpo.4-amd64 #1 SMP Debian 3.2.46-1~bpo60+1 x86_64 GNU/Linux and nfs-kernel-server on an Opteron barebone as well.

No kerberos is in use.

The system is basically the same as in Bug #1225494 . However, named bug is regarding a problem with nfs_idmap whereas this seems to be a problem with fscache.

The trace is attached.

I have also reported this bug against Ubuntu at https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1229643

Thanks,
Raoul

Comment 1 Raoul Bhatia 2013-09-30 11:25:16 UTC

Created attachment 110021 [details]
Missing w1a_oops_20130924.txt

Comment 2 Raoul Bhatia 2013-09-30 11:31:53 UTC

Created attachment 110031 [details]
w1a_20130929_multiple_traces.txt

More traces (multiple traces per file!)
from the same system running Kernel 3.12.0-031200rc2-generic from http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.12-rc2-saucy/ .

Comment 3 Raoul Bhatia 2013-09-30 11:32:11 UTC

Created attachment 110041 [details]
wc01_20130930_multiple_traces.txt