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Message-ID: <2f79a604-592e-a4b9-48df-020a5923311f@acm.org>
Date:   Tue, 16 Nov 2021 16:15:45 -0800
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To:     Jens Axboe <axboe@kernel.dk>
Cc:     "linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
        Ming Lei <ming.lei@redhat.com>
From:   Bart Van Assche <bvanassche@acm.org>
Subject: Hang in blk_mq_freeze_queue_wait()
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Hi,

If I run test srp/002 against v5.16-rc1 then dmsetup hangs as follows at 
the end of the test:

sysrq: Show Blocked State
task:dmsetup         state:D stack:28136 pid: 3088 ppid:  3087 
flags:0x00004000
Call Trace:
  <TASK>
  __schedule+0x4bd/0xc20
  schedule+0x84/0x140
  blk_mq_freeze_queue_wait+0xf7/0x130
  del_gendisk+0x342/0x410
  cleanup_mapped_device+0x165/0x170 [dm_mod]
  __dm_destroy+0x280/0x450 [dm_mod]
  dm_destroy+0x13/0x20 [dm_mod]
  dev_remove+0x156/0x1d0 [dm_mod]
  ctl_ioctl+0x2bb/0x4d0 [dm_mod]
  dm_ctl_ioctl+0xe/0x20 [dm_mod]
  __x64_sys_ioctl+0xc2/0xe0
  do_syscall_64+0x35/0x80
  entry_SYSCALL_64_after_hwframe+0x44/0xae

I haven't seen this hang with any previous kernel version. Could this be 
a block layer issue?

v5.16-rc1 includes Ming's commit 10f7335e3627 ("blk-mq: don't grab 
->q_usage_counter in blk_mq_sched_bio_merge").

Thanks,

Bart.