linux-kernel - Re: KASAN warning in bt_for

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Date:   Thu, 14 Feb 2019 14:20:54 -0800
From:   Bart Van Assche <bvanassche@....org>
To:     Jens Axboe <axboe@...nel.dk>, Evan Green <evgreen@...gle.com>
Cc:     linux-block <linux-block@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: KASAN warning in bt_for_each

On Thu, 2019-02-14 at 13:50 -0700, Jens Axboe wrote:
> On 2/14/19 1:45 PM, Evan Green wrote:
> > On Thu, Feb 14, 2019 at 11:33 AM Bart Van Assche <bvanassche@....org> wrote:
> > > 
> > > On Thu, 2019-02-14 at 10:04 -0800, Evan Green wrote:
> > > > Greetings, block experts!
> > > > 
> > > > I'm trying to track down a KASAN warning I'm seeing in our downstream
> > > > 4.19 kernel, and I could use a little help. The warning looks like
> > > > this:
> > > > 
> > > > [  224.564894] BUG: KASAN: use-after-free in bt_for_each+0x1ac/0x28c
> > > > [  224.571195] Read of size 8 at addr ffffffc17c621340 by task fio/3851
> > > > [  224.577745]
> > > > [  224.579320] CPU: 2 PID: 3851 Comm: fio Tainted: G W 4.19.16 #398
> > > 
> > > Please have a look at this e-mail thread:
> > > https://lore.kernel.org/linux-block/1545261885.185366.488.camel@acm.org/
> > 
> > Oh, yep, that's totally it. Did that patch make it in anywhere?
> 
> It didn't, since I didn't get any response to it.

I will have a look. Sorry that I had dropped the ball on that patch.

Bart.