linux-kernel - Re: bio linked list corruption.

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Message-ID: <20161026163018.wx57yy554576s6e2@codemonkey.org.uk>
Date:   Wed, 26 Oct 2016 12:30:18 -0400
From:   Dave Jones <davej@...emonkey.org.uk>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Chris Mason <clm@...com>, Andy Lutomirski <luto@...capital.net>,
        Andy Lutomirski <luto@...nel.org>, Jens Axboe <axboe@...com>,
        Al Viro <viro@...iv.linux.org.uk>, Josef Bacik <jbacik@...com>,
        David Sterba <dsterba@...e.com>,
        linux-btrfs <linux-btrfs@...r.kernel.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        Dave Chinner <david@...morbit.com>
Subject: Re: bio linked list corruption.

On Tue, Oct 25, 2016 at 06:39:03PM -0700, Linus Torvalds wrote:
 > On Tue, Oct 25, 2016 at 6:33 PM, Linus Torvalds
 > <torvalds@...ux-foundation.org> wrote:
 > >
 > > Completely untested. Maybe there's some reason we can't write to the
 > > whole thing like that?
 > 
 > That hack boots and seems to work for me, but doesn't show anything.
 > 
 > Dave, mind just trying that oneliner?

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.  I rebooted, and tried again and
went to bed.

12 hours later, it's still doing it's thing.

Heisenbugs man, literally the worst.

	Dave