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/ (local)

Bart.