XFS Kernel Panics in CentOS

[Changliang Chen]

Hi Eric,

    Is this issue resolved? We have  been getting the same problem, though
we had upgrated the kernel to 2.6.18-308.8.2.el5.

On Tue, Apr 3, 2012 at 2:03 AM, Eric Sandeen <sandeen at sandeen.net> wrote:

> On 4/2/12 8:09 AM, Mark Rechler wrote:
> > Hi Eric,
> >
> > Thank you for the reply. We are running CentOS 5.8, with the
> > 2.6.18-164.10.1.el5.centos.plus kernel as it was mentioned in a bug
> > report that has similar behavior, but ultimately a different kernel
> > panic (http://bugs.centos.org/view.php?id=4089). We have tried
> > running xfs_repair in the past and it has not proved useful. The odd
> > part is that these are fresh systems (just installed). If it helps,
> > we are also running glusterfs on these boxes though load does not
> > always correlate to a kernel panic.
>
> I can't say for sure what's in that respun "extra" centos kernel,
> but I can say this:  the error you hit indicates that xfs read a
> buffer, and wound up with a metadata buffer which had unrecognized
> magic - i.e. it did not look like metadata as expected.  Seeing what
> looks like corruption, it shut down.
>
> This reminds me a little of
> https://bugzilla.redhat.com/show_bug.cgi?id=512552
> which I fixed for RHEL customers a while back, where cancelled
> readahead in MD was resulting in xfs thinking a buffer was
> uptodate, but in fact it was uninitialized, hence it found
> garbage and shut down in this way.
>
> Something similar seems to be happening in your case, if xfs_repair
> comes up clean; somehow xfs is getting hold of a buffer which
> apparently doesn't match what xfs_repair found to be a consistent
> filesystem.
>
> So I might suspect something in the storage stack?
>
> Also please be sure you don't have kmod-xfs or xfs-kmod installed
> on your centos box, which is a truly ancient and completely unsupported
> backport of xfs from long, long ago.
>
> -Eric
>
> > Thanks,
> > Mark
> >
> > On Fri, Mar 30, 2012 at 6:44 PM, Eric Sandeen <sandeen at sandeen.net<mailto:
> sandeen at sandeen.net>> wrote:
> >
> >     On 3/30/12 5:02 PM, Mark Rechler wrote:
> >     > Hi Everyone,
> >     >
> >     > We've been getting a lot of errors (across several kernels) and
> eventually a kernel panic. Any insight into these errors would be much
> appreciated.
> >     >
> >     > Errors:
> >     > Filesystem "dm-3": XFS internal error xfs_da_do_buf(2) at line
> 2112 of file fs/xfs/xfs_da_btree.c.  Caller 0xffffffff883c1826
> >
> >     Saying which CentOS it is would help ;)  And, standard disclaimers
> about how CentOS doesn't come with upstream _or_ distro support, etc etc...
> >
> >     But xfs_da_do_buf(2) indicates on-disk corruption, having
> encountered a bad magic number when reading from the disk.  Have you tried
> xfs_repair?
> >
> >     -Eric
> >
> >     > Call Trace:
> >     >  [<ffffffff883c1725>] :xfs:xfs_da_do_buf+0x503/0x5b1
> >     >  [<ffffffff883c1826>] :xfs:xfs_da_read_buf+0x16/0x1b
> >     >  [<ffffffff883c1826>] :xfs:xfs_da_read_buf+0x16/0x1b
> >     >  [<ffffffff883aeb71>] :xfs:xfs_attr_leaf_get+0x2e/0x99
> >     >  [<ffffffff883aeb71>] :xfs:xfs_attr_leaf_get+0x2e/0x99
> >     >  [<ffffffff883aec7f>] :xfs:xfs_attr_fetch+0xa3/0xd5
> >     >  [<ffffffff883a7aa8>] :xfs:xfs_acl_iaccess+0x64/0xd4
> >     >  [<ffffffff883f264a>] :xfs:xfs_check_acl+0x1b/0x2b
> >     >  [<ffffffff8000f550>] generic_permission+0x40/0xca
> >     >  [<ffffffff8000d902>] permission+0x81/0xc8
> >     >  [<ffffffff8000999d>] __link_path_walk+0x173/0xf42
> >     >  [<ffffffff8000e9cc>] link_path_walk+0x42/0xb2
> >     >  [<ffffffff8000cc9c>] do_path_lookup+0x275/0x2f1
> >     >  [<ffffffff8001278e>] getname+0x15b/0x1c2
> >     >  [<ffffffff800236f6>] __user_walk_fd+0x37/0x4c
> >     >  [<ffffffff8003f1f6>] vfs_lstat_fd+0x18/0x47
> >     >  [<ffffffff8008c46e>] default_wake_function+0x0/0xe
> >     >  [<ffffffff800efddf>] sys_lgetxattr+0x4e/0x5f
> >     >  [<ffffffff8002a996>] sys_newlstat+0x19/0x31
> >     >  [<ffffffff8005d229>] tracesys+0x71/0xe0
> >     >  [<ffffffff8005d28d>] tracesys+0xd5/0xe0
> >     >
> >     > Code: 0f b6 40 02 89 44 24 04 e9 95 00 00 00 44 0f b6 Z3 44 3b 65
> >     > RIP [<ffffffffff8841bfaf>]
> :xfs:xfs_attr_shortform_getvalue+0x24/0xe2
> >     >   RSP <ffff81020752dbc8>
> >     > CR2: 00000000000002
> >     >   <0>Kernel panic - not syncing: Fatal exception
> >     >
> >     > Thanks,
> >     > Mark
> >     >
> >     >
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> >
> >
>
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-- 

Regards,

Cocl
ops manager
19lou Operation & Maintenance Dept
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