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Re: Xfs fails in xfstests 013

To: LukÃÅ Czerner <lczerner@xxxxxxxxxx>
Subject: Re: Xfs fails in xfstests 013
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Fri, 1 Feb 2013 11:29:27 +1100
Cc: xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <alpine.LFD.2.00.1301310910080.14328@xxxxxxxxxxxxxxxxxxxxxxxxx>
Mail-followup-to: LukÃÅ Czerner <lczerner@xxxxxxxxxx>, xfs@xxxxxxxxxxx
References: <alpine.LFD.2.00.1301310910080.14328@xxxxxxxxxxxxxxxxxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Thu, Jan 31, 2013 at 09:19:23AM +0100, LukÃÅ 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?

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.

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx

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