From: Jan Kara <jack@suse.cz>
To: Ben Myers <bpm@sgi.com>
Cc: Jan Kara <jack@suse.cz>, xfs@oss.sgi.com
Subject: Re: [PATCH] xfs: Fix WARN_ON(delalloc) in xfs_vm_releasepage()
Date: Mon, 18 Mar 2013 17:05:52 +0100 [thread overview]
Message-ID: <20130318160552.GC28508@quack.suse.cz> (raw)
In-Reply-To: <20130315205214.GB22182@sgi.com>
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On Fri 15-03-13 15:52:14, Ben Myers wrote:
> Hi Jan,
>
> On Thu, Mar 14, 2013 at 02:30:54PM +0100, Jan Kara wrote:
> > When a dirty page is truncated from a file but reclaim gets to it before
> > truncate_inode_pages(), we hit WARN_ON(delalloc) in
> > xfs_vm_releasepage(). This is because reclaim tries to write the page,
> > xfs_vm_writepage() just bails out (leaving page clean) and thus reclaim
> > thinks it can continue and calls xfs_vm_releasepage() on page with dirty
> > buffers.
> >
> > Fix the issue by redirtying the page in xfs_vm_writepage(). This makes
> > reclaim stop reclaiming the page and also logically it keeps page in a
> > more consistent state where page with dirty buffers has PageDirty set.
>
> Was there an easy way to reproduce this? I'm testing and reviewing this now
> and it might help.
I used scripts/run-bash-shared-mapping.sh from the attached tarball - it
fires up several processes beating a file with mmap accesses while
truncating the file and memory stressing the machine. I presume fsx with
some memhog could trigger the issue as well.
Honza
--
Jan Kara <jack@suse.cz>
SUSE Labs, CR
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next prev parent reply other threads:[~2013-03-18 16:06 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-14 13:30 [PATCH] xfs: Fix WARN_ON(delalloc) in xfs_vm_releasepage() Jan Kara
2013-03-14 20:21 ` Carlos Maiolino
2013-03-15 20:52 ` Ben Myers
2013-03-18 16:05 ` Jan Kara [this message]
2013-03-19 3:47 ` Dave Chinner
2013-03-19 15:42 ` Jan Kara
2013-03-21 1:37 ` Dave Chinner
2013-03-22 21:12 ` Ben Myers
2013-03-16 7:35 ` Dave Chinner
2013-03-22 23:18 ` Ben Myers
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