linux-ext4 - Re: Possible ext4 corruption

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Date:	Tue, 10 Mar 2009 13:54:11 +1030
From:	Kevin Shanahan <kmshanah@...b.org.au>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: Possible ext4 corruption - ACL related?

On Mon, 2009-03-09 at 21:57 -0500, Eric Sandeen wrote:
> Kevin Shanahan wrote:
> > I think we have some minor corruption happening with a new (about two
> > weeks old) ext4 file system. Our backup script spat out bunch of errors
> > last night while trying to read the file ACLs:
> > 
> > getfacl: apps/Gestalt.Net/SetupCD/program\040files/Business\040Objects/Common/3.5/bin/Cdo32sv.dll: Input/output error
> > getfacl: apps/Gestalt.Net/SetupCD/program\040files/Business\040Objects/Common/3.5/bin/U3520chs.dll: Input/output error
> > getfacl: apps/Gestalt.Net/SetupCD/program\040files/Business\040Objects/Common/3.5/bin/ReportRenderer.dll: Input/output error
> > getfacl: apps/Gestalt.Net/SetupCD/program\040files/Business\040Objects/Common/3.5/bin/ParameterDesigner.dll: Input/output error
> > ...
> > 
> > And in syslog I see these warnings from the kernel:
> > 
> > Mar 10 00:06:01 hermes /USR/SBIN/CRON[10875]: (root) CMD (   /usr/local/bin/rsync-backup-all.sh)
> > Mar 10 00:06:24 hermes kernel: init_special_inode: bogus i_mode (53253)
> > Mar 10 00:06:24 hermes kernel: attempt to access beyond end of device
> > Mar 10 00:06:24 hermes kernel: dm-0: rw=0, want=1312475392770056, limit=2147483648
> > Mar 10 00:06:25 hermes kernel: attempt to access beyond end of device
> > Mar 10 00:06:25 hermes kernel: dm-0: rw=0, want=1312475392770056, limit=2147483648
> > 
> > The filesystem is still in use (and working okay, AFAICT), but I'll need
> > to fsck this tonight. Is there any useful data I can gather from the fs
> > before (or while) I do that which might help track down the cause?
> 
> an e2image of the filesystem before fsck might help, and be sure to save
> fsck output.

Okay, will do.

> Were there other interesting messages before or after the above?

No, nothing at all. The bogus i_mode message has showed up a few more
times today though:

Mar 10 10:42:41 hermes kernel: init_special_inode: bogus i_mode (53253)
Mar 10 11:29:34 hermes kernel: init_special_inode: bogus i_mode (53253)
Mar 10 12:41:39 hermes kernel: init_special_inode: bogus i_mode (53253)

> If you try a manual getfacl of the above files do you still get the error?

Yeah, same thing:

hermes:/srv/samba/local# getfacl apps/Gestalt.Net/SetupCD/program\ files/Business\ Objects/Common/3.5/bin/Cdo32sv.dll 
getfacl: apps/Gestalt.Net/SetupCD/program\040files/Business\040Objects/Common/3.5/bin/Cdo32sv.dll: Input/output error

Nothing extra showing up in dmesg after doing that, so it's possible the
two are unrelated - although, the coincidence would surprise me.

Cheers,
Kevin.


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