From: Tejun Heo <tj@kernel.org>
To: Bart Van Assche <bart.vanassche@wdc.com>
Cc: Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org, Christoph Hellwig <hch@lst.de>,
Sagi Grimberg <sagi@grimberg.me>,
Israel Rukshin <israelr@mellanox.com>,
Max Gurtovoy <maxg@mellanox.com>,
stable@vger.kernel.org
Subject: Re: [PATCH v4] blk-mq: Fix race conditions in request timeout handling
Date: Tue, 10 Apr 2018 07:20:28 -0700 [thread overview]
Message-ID: <20180410142028.GM3126663@devbig577.frc2.facebook.com> (raw)
In-Reply-To: <20180410013455.7448-1-bart.vanassche@wdc.com>
Hello, Bart.
On Mon, Apr 09, 2018 at 06:34:55PM -0700, Bart Van Assche wrote:
> Since the request state can be updated from two different contexts,
> namely regular completion and request timeout, this race cannot be
> fixed with RCU synchronization only. Fix this race as follows:
Well, it can be and the patches have been posted months ago. It just
needed a repro case to confirm the fix, which we now seem to have.
Switching to another model might be better but let's please do that
with the right rationales. A good portion of this seems to be built
on misunderstandings.
Thanks.
--
tejun
next prev parent reply other threads:[~2018-04-10 14:20 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-10 1:34 [PATCH v4] blk-mq: Fix race conditions in request timeout handling Bart Van Assche
2018-04-10 7:59 ` jianchao.wang
2018-04-10 10:04 ` Ming Lei
2018-04-10 12:04 ` Shan Hai
2018-04-10 13:01 ` Bart Van Assche
2018-04-10 14:32 ` jianchao.wang
2018-04-10 8:41 ` Ming Lei
2018-04-10 12:58 ` Bart Van Assche
2018-04-10 13:55 ` Ming Lei
2018-04-10 14:09 ` Bart Van Assche
2018-04-10 14:30 ` Ming Lei
2018-04-10 15:02 ` Bart Van Assche
2018-04-10 15:25 ` Ming Lei
2018-04-10 15:30 ` tj
2018-04-10 15:38 ` Ming Lei
2018-04-10 15:40 ` tj
2018-04-10 21:33 ` tj
2018-04-10 21:46 ` Bart Van Assche
2018-04-10 21:54 ` tj
2018-04-11 12:50 ` Bart Van Assche
2018-04-11 14:16 ` tj
2018-04-11 18:38 ` Martin Steigerwald
2018-04-11 14:24 ` Sagi Grimberg
2018-04-11 14:43 ` tj
2018-04-11 16:16 ` Israel Rukshin
2018-04-11 17:07 ` tj
2018-04-11 21:31 ` tj
2018-04-12 8:59 ` Israel Rukshin
2018-04-12 13:35 ` tj
2018-04-15 12:28 ` Israel Rukshin
2018-04-18 16:34 ` Bart Van Assche
2018-04-10 9:55 ` Christoph Hellwig
2018-04-10 13:26 ` Bart Van Assche
2018-04-10 14:50 ` hch
2018-04-10 14:41 ` Jens Axboe
2018-04-10 14:20 ` Tejun Heo [this message]
2018-04-10 14:30 ` Bart Van Assche
2018-04-10 14:33 ` tj
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