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From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Wed, 26 Oct 2016 09:48:39 -0700
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Subject: Re: bio linked list corruption.
To: Dave Jones <davej@codemonkey.org.uk>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Chris Mason <clm@fb.com>, Andy Lutomirski <luto@amacapital.net>,
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        David Sterba <dsterba@suse.com>,
        linux-btrfs <linux-btrfs@vger.kernel.org>,
        Linux Kernel <linux-kernel@vger.kernel.org>,
        Dave Chinner <david@fromorbit.com>
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On Wed, Oct 26, 2016 at 9:30 AM, Dave Jones <davej@codemonkey.org.uk> wrote:
>
> I gave this a go last thing last night. It crashed within 5 minutes,
> but it was one we've already seen (the bad page map trace) with nothing
> additional that looked interesting.

Did the bad page map trace have any registers that looked like they
had 0xd0d0d0d0d0d0 in them?

I assume not, but worth checking.

> Heisenbugs man, literally the worst.

I know you already had this in some email, but I lost it. I think you
narrowed it down to a specific set of system calls that seems to
trigger this best. fallocate and xattrs or something?

              Linus