linux-2.6.34 xfs crash: xfs_inode_ag_iterator+0x6c - NULL pointer dereference

[Christoph Hellwig]

On Thu, Jun 10, 2010 at 07:45:01PM +0200, Peter Niemayer wrote:
> Hi,
> 
> FYI: attached screen-shot is from a server that crashed today when
> doing an "umount" of a no longer needed XFS partition on a SSD
> (mount options: rw,noatime,nodiratime,nobarrier)
> 
> (The operations on that filesystem ended > 1 day before the umount,
>  and did not show any problem)
> 
> Kernel was plain vanilla 2.6.34.

Unfortunately the backtrace doesn't really tell what has happened as
the origin of the backtrace scrolled away.