linux-kernel - Re: btrfs bio linked list corruption.

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Date:   Tue, 11 Oct 2016 11:49:18 -0400
From:   Dave Jones <davej@...emonkey.org.uk>
To:     Chris Mason <clm@...com>
Cc:     Al Viro <viro@...IV.linux.org.uk>, Josef Bacik <jbacik@...com>,
        David Sterba <dsterba@...e.com>, linux-btrfs@...r.kernel.org,
        Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: btrfs bio linked list corruption.

On Tue, Oct 11, 2016 at 11:20:41AM -0400, Chris Mason wrote:
 > 
 > 
 > On 10/11/2016 11:19 AM, Dave Jones wrote:
 > > On Tue, Oct 11, 2016 at 04:11:39PM +0100, Al Viro wrote:
 > >  > On Tue, Oct 11, 2016 at 10:45:08AM -0400, Dave Jones wrote:
 > >  > > This is from Linus' current tree, with Al's iovec fixups on top.
 > >  >
 > >  > Those iovec fixups are in the current tree...
 > >
 > > ah yeah, git quietly dropped my local copy when I rebased so I didn't notice.
 > >
 > >  > TBH, I don't see anything
 > >  > in splice-related stuff that could come anywhere near that (short of
 > >  > some general memory corruption having random effects of that sort).
 > >  >
 > >  > Could you try to bisect that sucker, or is it too hard to reproduce?
 > >
 > > Only hit it the once overnight so far. Will see if I can find a better way to
 > > reproduce today.
 > 
 > This call trace is reading metadata so we can finish the truncate.  I'd 
 > say adding more memory pressure would make it happen more often.

That story checks out. There were a bunch of oom's in the log before this.

	Dave