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Message-ID: <1550172827.93548.5.camel@acm.org>
Subject: Re: KASAN warning in bt_for_each
From:   Bart Van Assche <bvanassche@acm.org>
To:     Evan Green <evgreen@google.com>,
        linux-block <linux-block@vger.kernel.org>
Cc:     LKML <linux-kernel@vger.kernel.org>, Jens Axboe <axboe@kernel.dk>
Date:   Thu, 14 Feb 2019 11:33:47 -0800
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References: <CAE=gft4_WiL87FtZnVmZok+oXPjK=GUb5tDUPGQFijddrB0Pbg@mail.gmail.com>
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On Thu, 2019-02-14 at 10:04 -0800, Evan Green wrote:
+AD4 Greetings, block experts+ACE
+AD4 
+AD4 I'm trying to track down a KASAN warning I'm seeing in our downstream
+AD4 4.19 kernel, and I could use a little help. The warning looks like
+AD4 this:
+AD4 
+AD4 +AFs  224.564894+AF0 BUG: KASAN: use-after-free in bt+AF8-for+AF8-each+-0x1ac/0x28c
+AD4 +AFs  224.571195+AF0 Read of size 8 at addr ffffffc17c621340 by task fio/3851
+AD4 +AFs  224.577745+AF0
+AD4 +AFs  224.579320+AF0 CPU: 2 PID: 3851 Comm: fio Tainted: G W 4.19.16 +ACM-398

Please have a look at this e-mail thread:
https://lore.kernel.org/linux-block/1545261885.185366.488.camel+AEA-acm.org/

Bart.