From: Bart Van Assche <bvanassche@acm.org>
To: Jens Axboe <axboe@kernel.dk>,
"jianchao.wang" <jianchao.w.wang@oracle.com>,
"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>
Subject: Re: v4.20-rc6: Sporadic use-after-free in bt_iter()
Date: Thu, 20 Dec 2018 13:40:43 -0800 [thread overview]
Message-ID: <1545342043.185366.523.camel@acm.org> (raw)
In-Reply-To: <61515137-0565-e3b7-e6de-554af7d49753@kernel.dk>
On Thu, 2018-12-20 at 14:34 -0700, Jens Axboe wrote:
> Yeah, I don't think it's bullet proof either, it just closes the gap.
> I'm fine with fiddling with the tag iteration. On top of what I sent, we
> could have tag iteration hold the RCU read lock, and then we just need
> to ensure that the tags are freed with RCU.
Do you mean using call_rcu() to free tags? Would that require to add a
struct rcu_head to every request? Would it be acceptable to increase the
size of struct request with an rcu_head? Additionally, could that reduce
the queue depth if the time between grace periods is larger than the time
between I/O submissions?
Thanks,
Bart.
next prev parent reply other threads:[~2018-12-20 21:40 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-19 23:24 v4.20-rc6: Sporadic use-after-free in bt_iter() Bart Van Assche
2018-12-19 23:27 ` Jens Axboe
2018-12-20 0:16 ` Bart Van Assche
2018-12-20 3:17 ` Jens Axboe
2018-12-20 3:24 ` jianchao.wang
2018-12-20 4:19 ` Jens Axboe
2018-12-20 4:32 ` jianchao.wang
2018-12-20 4:48 ` Jens Axboe
2018-12-20 5:03 ` jianchao.wang
2018-12-20 13:02 ` Jens Axboe
2018-12-20 13:07 ` Jens Axboe
2018-12-20 18:01 ` Bart Van Assche
2018-12-20 18:21 ` Jens Axboe
2018-12-20 18:33 ` Jens Axboe
2018-12-20 20:56 ` Bart Van Assche
2018-12-20 21:00 ` Jens Axboe
2018-12-20 21:23 ` Bart Van Assche
2018-12-20 21:26 ` Jens Axboe
2018-12-20 21:31 ` Bart Van Assche
2018-12-20 21:34 ` Jens Axboe
2018-12-20 21:40 ` Bart Van Assche [this message]
2018-12-20 21:44 ` Jens Axboe
2018-12-20 21:48 ` Jens Axboe
2018-12-20 22:19 ` Bart Van Assche
2018-12-20 22:23 ` Jens Axboe
2018-12-20 22:33 ` Jens Axboe
2018-12-20 22:47 ` Jens Axboe
2018-12-20 22:50 ` Jens Axboe
2019-02-14 23:36 ` Bart Van Assche
2019-02-15 18:29 ` Evan Green
2019-02-19 16:48 ` Bart Van Assche
2019-02-21 20:54 ` Evan Green
2019-02-15 2:57 ` jianchao.wang
2018-12-20 4:06 ` Ming Lei
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