linux-kernel - Re: [block/mq] 2aa18c32fd: WARNING:at_block/mq-deadline-main.c:#dd_insert

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Date:   Fri, 11 Jun 2021 08:58:28 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     kernel test robot <oliver.sang@...el.com>
Cc:     Damien Le Moal <damien.lemoal@....com>,
        Hannes Reinecke <hare@...e.de>, Christoph Hellwig <hch@....de>,
        Ming Lei <ming.lei@...hat.com>,
        Johannes Thumshirn <johannes.thumshirn@....com>,
        Himanshu Madhani <himanshu.madhani@...cle.com>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
        lkp@...el.com
Subject: Re: [block/mq] 2aa18c32fd:
 WARNING:at_block/mq-deadline-main.c:#dd_insert_requests

On 6/11/21 12:04 AM, kernel test robot wrote:
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):

In the dmesg output I found the following:

kern  :warn  : [  100.174333] WARNING: CPU: 0 PID: 1055 at
block/mq-deadline-main.c:714 dd_insert_requests+0x1b5/0x300
kern  :warn  : [  100.521569] WARNING: CPU: 0 PID: 1055 at
block/mq-deadline-main.c:474 dd_dispatch_request+0x280/0x380

So these warnings are triggered by:

#if defined(CONFIG_BLK_CGROUP)
		WARN_ON_ONCE(true);
#endif

and in both call stacks I found the following: blkdev_issue_discard(). I
will take a closer look.

Bart.