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Subject: Re: [block/mq] 2aa18c32fd:
 WARNING:at_block/mq-deadline-main.c:#dd_insert_requests
To:     kernel test robot <oliver.sang@intel.com>
Cc:     Damien Le Moal <damien.lemoal@wdc.com>,
        Hannes Reinecke <hare@suse.de>, Christoph Hellwig <hch@lst.de>,
        Ming Lei <ming.lei@redhat.com>,
        Johannes Thumshirn <johannes.thumshirn@wdc.com>,
        Himanshu Madhani <himanshu.madhani@oracle.com>,
        LKML <linux-kernel@vger.kernel.org>, lkp@lists.01.org,
        lkp@intel.com
References: <20210611070434.GA26476@xsang-OptiPlex-9020>
From:   Bart Van Assche <bvanassche@acm.org>
Message-ID: <3e58f0b5-3dbe-b38a-ea2f-2399f5a451f5@acm.org>
Date:   Fri, 11 Jun 2021 08:58:28 -0700
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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.