From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Return-Path: Sender: Tejun Heo Date: Thu, 8 Feb 2018 09:19:34 -0800 From: "tj@kernel.org" To: Bart Van Assche Cc: "hch@lst.de" , "linux-block@vger.kernel.org" , "axboe@kernel.dk" Subject: Re: [PATCH v2] blk-mq: Fix race between resetting the timer and completion handling Message-ID: <20180208171934.GQ695913@devbig577.frc2.facebook.com> References: <1518024428.2870.35.camel@wdc.com> <20180207173531.GC695913@devbig577.frc2.facebook.com> <1518027251.2870.53.camel@wdc.com> <20180207200724.GD695913@devbig577.frc2.facebook.com> <1518047297.2870.80.camel@wdc.com> <1518052193.2870.90.camel@wdc.com> <20180208153940.GM695913@devbig577.frc2.facebook.com> <1518107501.3611.19.camel@wdc.com> <20180208170010.GP695913@devbig577.frc2.facebook.com> <1518109843.3611.25.camel@wdc.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <1518109843.3611.25.camel@wdc.com> List-ID: Hello, Bart. On Thu, Feb 08, 2018 at 05:10:45PM +0000, Bart Van Assche wrote: > I think "dereferencing a pointer" means reading the memory location that pointer points > at? Anyway, I think we both interpret the crash report in the same way, namely that it > means that scmd->device == NULL. No, what I'm trying to say is that it's is the device->host reference not the scmd->device reference. Thanks. -- tejun