linux-kernel - Re: bio linked list corruption.

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Message-ID: <20161123195845.iphzr7ac4mu5ewjt@codemonkey.org.uk>
Date:   Wed, 23 Nov 2016 14:58:45 -0500
From:   Dave Jones <davej@...emonkey.org.uk>
To:     Chris Mason <clm@...com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Jens Axboe <axboe@...com>,
        Andy Lutomirski <luto@...capital.net>,
        Andy Lutomirski <luto@...nel.org>,
        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, Nov 23, 2016 at 02:34:19PM -0500, Dave Jones wrote:

 > [  317.689216] BUG: Bad page state in process kworker/u8:8  pfn:4d8fd4
 > trace from just before this happened. Does this shed any light ?
 > 
 > https://codemonkey.org.uk/junk/trace.txt

crap, I just noticed the timestamps in the trace come from quite a bit
later.  I'll tweak the code to do the taint checking/ftrace stop after
every syscall, that should narrow the window some more.

Getting closer..

	Dave