linux-kernel - Re: [block] 044f1daaaa kernel BUG at block/blk-mq.c:415!

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Date:   Mon, 26 Jun 2017 22:16:09 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Fengguang Wu <fengguang.wu@...el.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>, linux-block@...r.kernel.org,
        LKP <lkp@...org>
Subject: Re: [block] 044f1daaaa kernel BUG at block/blk-mq.c:415!

On 06/26/2017 09:53 PM, Fengguang Wu wrote:
> Greetings,
> 
> Sorry the report is a bit late, this bug looks still active:
> 
 
First I've heard about it!

> [   36.037364]   sector 2, nr/cnr 0/2
> [   36.037367]   bio ffff88001af84e80, biotail ffff88001af84e80, len 0
> [   36.037367]   bio ffff88001af84e80, biotail ffff88001af84e80, len 0
> [   36.037424] ------------[ cut here ]------------
> [   36.037424] ------------[ cut here ]------------
> [   36.037428] kernel BUG at block/blk-mq.c:415!
> [   36.037428] kernel BUG at block/blk-mq.c:415!
> [   36.037433] invalid opcode: 0000 [#1] PREEMPT SMP
> [   36.037433] invalid opcode: 0000 [#1] PREEMPT SMP
> [   36.037434] Modules linked in:
> [   36.037434] Modules linked in:

Do you have the full dmesg of this? I looked at the one attached to the
bug report, but that's a completely different bug (NULL deref in drm).
Are you sure it's still the above blk-mq BUG() we're hitting?

-- 
Jens Axboe