linux-kernel - Re: bio linked list corruption.

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Message-ID: <CA+55aFzsrRenu3NsDYr3qqO=fC9FUxkLc3M2wzeLBpN7ghwvwA@mail.gmail.com>
Date:   Wed, 26 Oct 2016 09:48:39 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Dave Jones <davej@...emonkey.org.uk>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        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 Wed, Oct 26, 2016 at 9:30 AM, Dave Jones <davej@...emonkey.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