Xfs fails in xfstests 013

[Lukáš Czerner]

On Fri, 1 Feb 2013, Dave Chinner wrote:

> Date: Fri, 1 Feb 2013 11:29:27 +1100
> From: Dave Chinner <david at fromorbit.com>
> To: Lukáš Czerner <lczerner at redhat.com>
> Cc: xfs at oss.sgi.com
> Subject: Re: Xfs fails in xfstests 013
> 
> On Thu, Jan 31, 2013 at 09:19:23AM +0100, Lukáš Czerner wrote:
> > Hi.
> > 
> > I've just run xfstest 013 on xfs and it fails with this backtrace
> > 
> > 
> > Jan 31 03:09:07 rhel6_vm1 kernel: ffff88020b6d1000: 78 78 78 78 78 78 78 78 78 78 2f 78 78 78 78 78  xxxxxxxxxx/xxxxx
> > Jan 31 03:09:07 rhel6_vm1 kernel: XFS (sda): Internal error xfs_bmbt_verify at line 747 of file fs/xfs/xfs_bmap_btree.c.  Caller 0xffffffffa025486e
> 
> Same problem Cai Qian just reported - a remote symlink with a bmbt
> verifier attached to it.
> 
> > I can reproduce it every time with xfstest 013 on 3.8.0-rc5.
> 
> And the configuration you are testing?

The system is x86_64 KVM guest and I am using the following config

export TEST_DEV=/dev/sda
export TEST_DIR=/mnt/test
export SCRATCH_DEV=/dev/sdb
export SCRATCH_MNT=/mnt/test1
export MKFS_OPTIONS="-f "
export FSTYP=xfs

Where /dev/sda and /dev/sdb are 50GB in size and those are exported
from the host linear logical volumes.

> 
> I'd suggest that you add an:
> 
> 	ASSERT(bp->b_ops == NULL);
> 
> into xfs_symlink() after the xfs_trans_get_buf() call in the remote
> symlink crate loop, because the problem occurring implies that the
> code is getting a new buffer with a stale ops structure on it
> (though I can't see how that is possible right now).
> 
> You should probably put the same assert into
> xfs_inactive_symlink_rmt() between the get buf and the
> xfs_trans_binval() call, and into xfs_readlink_bmap() after the
> contents of a symlink are read from disk.

Ok, I'll try that and let you know.

Thanks!
-Lukas

> 
> Cheers,
> 
> Dave.
>