Re: btrfs bio linked list corruption.

From	Dave Jones <davej@codemonkey.org.uk>
Newsgroups	linux.kernel
Subject	Re: btrfs bio linked list corruption.
Date	2016-10-11 18:00 +0200
Message-ID	<sr7Dc-84-5@gated-at.bofh.it> (permalink)
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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

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Re: btrfs bio linked list corruption. Al Viro <viro@ZenIV.linux.org.uk> - 2016-10-11 17:20 +0200
  Re: btrfs bio linked list corruption. Dave Jones <davej@codemonkey.org.uk> - 2016-10-11 17:30 +0200
    Re: btrfs bio linked list corruption. Dave Jones <davej@codemonkey.org.uk> - 2016-10-11 18:00 +0200

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