Re: XFS internal error xfs_trans_cancel at line 1138 of file fs/xfs/xfs_trans.c (kernel 2.6.18.1)

[Jesper Juhl]

On 29/11/06, David Chinner <dgc@xxxxxxx> wrote:
> On Tue, Nov 28, 2006 at 04:49:00PM +0100, Jesper Juhl wrote:
> > Hi,
> >
> > One of my NFS servers just gave me a nasty surprise that I think it is
> > relevant to tell you about:
>
> Thanks, Jesper.
>
> > Filesystem "dm-1": XFS internal error xfs_trans_cancel at line 1138 of
> > file fs/xfs/xfs_trans.c.  Caller 0xffffffff8034b47e
> >
> > Call Trace:
> > [<ffffffff8020b122>] show_trace+0xb2/0x380
> > [<ffffffff8020b405>] dump_stack+0x15/0x20
> > [<ffffffff80327b4c>] xfs_error_report+0x3c/0x50
> > [<ffffffff803435ae>] xfs_trans_cancel+0x6e/0x130
> > [<ffffffff8034b47e>] xfs_create+0x5ee/0x6a0
> > [<ffffffff80356556>] xfs_vn_mknod+0x156/0x2e0
> > [<ffffffff803566eb>] xfs_vn_create+0xb/0x10
> > [<ffffffff80284b2c>] vfs_create+0x8c/0xd0
> > [<ffffffff802e734a>] nfsd_create_v3+0x31a/0x560
> > [<ffffffff802ec838>] nfsd3_proc_create+0x148/0x170
> > [<ffffffff802e19f9>] nfsd_dispatch+0xf9/0x1e0
> > [<ffffffff8049d617>] svc_process+0x437/0x6e0
> > [<ffffffff802e176d>] nfsd+0x1cd/0x360
> > [<ffffffff8020ab1c>] child_rip+0xa/0x12
> > xfs_force_shutdown(dm-1,0x8) called from line 1139 of file
> > fs/xfs/xfs_trans.c.  Return address = 0xffffffff80359daa
>
> We shut down the filesystem because we cancelled a dirty transaction.
> Once we start to dirty the incore objects, we can't roll back to
> an unchanged state if a subsequent fatal error occurs during the
> transaction and we have to abort it.
So you are saying that there's nothing I can do to prevent this from
happening in the future?

> If I understand historic occurrences of this correctly, there is
> a possibility that it can be triggered in ENOMEM situations. Was your
> machine running out of memoy when this occurred?
Not really. I just checked my monitoring software and, at the time
this happened, the box had ~5.9G RAM free (of 8G total) and no swap
used (but 11G available).


> > Filesystem "dm-1": Corruption of in-memory data detected.  Shutting
> > down filesystem: dm-1
> > Please umount the filesystem, and rectify the problem(s)
> > nfsd: non-standard errno: 5
>
> EIO gets returned in certain locations once the filesystem has
> been shutdown.
Makes sense.


> > I unmounted the filesystem, ran xfs_repair which told me to try an
> > mount it first to replay the log, so I did, unmounted it again, ran
> > xfs_repair (which didn't find any problems) and finally mounted it and
> > everything is good - the filesystem seems intact.
>
> Yeah, the above error report typically is due to an in-memory
> problem, not an on disk issue.
Good to know.


> > The server in question is running kernel 2.6.18.1
>
> Can happen to XFS on any kernel version - got a report of this from
> someone running a 2.4 kernel a couple of weeks ago....

Ok.  Thank you for your reply David.

--
Jesper Juhl <jesper.juhl@xxxxxxxxx>
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