From: "tj@kernel.org" <tj@kernel.org>
To: Bart Van Assche <Bart.VanAssche@wdc.com>
Cc: "hch@lst.de" <hch@lst.de>,
"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
"axboe@kernel.dk" <axboe@kernel.dk>
Subject: Re: [PATCH v2] blk-mq: Fix race between resetting the timer and completion handling
Date: Thu, 8 Feb 2018 09:54:51 -0800 [thread overview]
Message-ID: <20180208175451.GS695913@devbig577.frc2.facebook.com> (raw)
In-Reply-To: <1518112111.3611.42.camel@wdc.com>
On Thu, Feb 08, 2018 at 05:48:32PM +0000, Bart Van Assche wrote:
> On Thu, 2018-02-08 at 09:40 -0800, tj@kernel.org wrote:
> > Heh, sorry about not being clear. What I'm trying to say is that
> > scmd->device != NULL && device->host == NULL. Or was this what you
> > were saying all along?
>
> What I agree with is that the request pointer (req argument) is stored in %rdi
> and that mov 0x1b0(%rdi),%rax loads scmd->device into %rax. Since RIP ==
> scsi_times_out+0x17, since the instruction at that address tries to dereference
> %rax and since the register dump shows that %rax == NULL I think that means that
> scmd->device == NULL.
Ah, I was completely confused about which one had to be NULL. You're
absolutely right. Let's continue earlier in the thread.
Thanks.
--
tejun
next prev parent reply other threads:[~2018-02-08 17:54 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-07 1:11 [PATCH v2] blk-mq: Fix race between resetting the timer and completion handling Bart Van Assche
2018-02-07 17:06 ` Tejun Heo
2018-02-07 17:27 ` Bart Van Assche
2018-02-07 17:35 ` tj
2018-02-07 18:14 ` Bart Van Assche
2018-02-07 20:07 ` tj
2018-02-07 23:48 ` Bart Van Assche
2018-02-08 1:09 ` Bart Van Assche
2018-02-08 15:39 ` tj
2018-02-08 15:40 ` tj
2018-02-08 16:31 ` Bart Van Assche
2018-02-08 17:00 ` tj
2018-02-08 17:10 ` Bart Van Assche
2018-02-08 17:19 ` tj
2018-02-08 17:37 ` Bart Van Assche
2018-02-08 17:40 ` tj
2018-02-08 17:48 ` Bart Van Assche
2018-02-08 17:54 ` tj [this message]
2018-02-13 21:20 ` tj
2018-02-14 16:58 ` Bart Van Assche
2018-02-18 13:11 ` tj
2018-02-21 18:53 ` Bart Van Assche
2018-02-21 19:21 ` tj
2018-02-21 22:55 ` Bart Van Assche
2018-02-07 19:03 ` Bart Van Assche
2018-02-07 20:09 ` tj
2018-02-07 21:02 ` Bart Van Assche
2018-02-07 21:40 ` tj
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