linux-kernel - Re: KASAN warning in bt_for

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Message-ID: <1550172827.93548.5.camel@acm.org>
Date:   Thu, 14 Feb 2019 11:33:47 -0800
From:   Bart Van Assche <bvanassche@....org>
To:     Evan Green <evgreen@...gle.com>,
        linux-block <linux-block@...r.kernel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>, Jens Axboe <axboe@...nel.dk>
Subject: Re: KASAN warning in bt_for_each

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/

Bart.