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Re: XFS: Assertion failed: bp->b_bn != XFS_BUF_DADDR_NULL, file: fs/xfs/

To: Rafał Kupka <kupson@xxxxxxxxxx>
Subject: Re: XFS: Assertion failed: bp->b_bn != XFS_BUF_DADDR_NULL, file: fs/xfs/xfs_buf.c, line: 598
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Wed, 7 Mar 2012 07:30:20 +1100
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>, xfs@xxxxxxxxxxx
In-reply-to: <1330983612.28645.18.camel@xxxxxxxxxxxxxxxx>
References: <1330539626.7615.73.camel@xxxxxxxxxxxxxxxx> <20120302104348.GA22230@xxxxxxxxxxxxx> <1330774627.32457.24.camel@xxxxxxxxxxxxxxxx> <20120303114413.GA18748@xxxxxxxxxxxxx> <1330983612.28645.18.camel@xxxxxxxxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
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@xxxxxxxxxxxxx

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