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Subject: Re: [LKP] [block] 9d037ad707: BUG:unable_to_handle_kernel
To:     Christoph Hellwig <hch@lst.de>,
        kernel test robot <rong.a.chen@intel.com>
Cc:     LKML <linux-kernel@vger.kernel.org>, Jens Axboe <axboe@fb.com>,
        lkp@01.org
References: <20181129092031.GF21676@shao2-debian>
 <20181129170535.GA28147@lst.de>
From:   Jens Axboe <axboe@kernel.dk>
Message-ID: <e22e64dd-1433-345c-4e43-50c9d1818d6f@kernel.dk>
Date:   Thu, 29 Nov 2018 10:10:55 -0700
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On 11/29/18 10:05 AM, Christoph Hellwig wrote:
> On Thu, Nov 29, 2018 at 05:20:31PM +0800, kernel test robot wrote:
>> FYI, we noticed the following commit (built with gcc-7):
>>
>> commit: 9d037ad707ed6069fbea4e38e6ee37e027b13f1d ("block: remove req->timeout_list")
>> https://git.kernel.org/cgit/linux/kernel/git/axboe/linux-block.git mq-perf
> 
> This looks very odd.  How could we introduce a new BUG with the removal
> of an unused structure member?

Someone else reported a t10 pi issue, I'm guessing it's a latent bug and
the struct size changing is causing it to trigger weirdly on this one.
That's the only explanation, as it can't possibly be this specific commit.


-- 
Jens Axboe