XFS: Assertion failed: bp->b_bn != XFS_BUF_DADDR_NULL, file: fs/xfs/xfs_buf.c, line: 598

[Dave Chinner]

On Mon, Mar 05, 2012 at 10:40:12PM +0100, Rafał Kupka wrote:
> On Sat, 2012-03-03 at 06:44 -0500, Christoph Hellwig wrote:
> > On Sat, Mar 03, 2012 at 12:37:07PM +0100, Rafa?? Kupka wrote:
> > > On Fri, 2012-03-02 at 05:43 -0500, Christoph Hellwig wrote:
> Hi,
> 
> I've completed bisection process. It looks like kernel up to
> 
> 704b2907 "xfs: register the inode cache shrinker before quotachecks"
> 
> is good and first bad commit is:
> 
> 0e6e847f "xfs: stop using the page cache to back the buffer cache"

Which changed internals of the buffer cache, but not the external
interfaces.

> I double tested it - 704b2907 can do 60+ loops of xfsdump without any
> trouble and 0e6e847f breaks in <10 iterations.

What is your test case?

Also, it might be worthwhile to capture an event trace (e.g. all the
xfs_buf events) to see what occurs just before the error is
triggered. That might tell us exactl what sequence has occurred
leading up to the error.

Cheers,

Dave.
-- 
Dave Chinner
david at fromorbit.com