TITLE: INFO: task hung in blkdev_put
ALT: hang in blkdev_put
TYPE: HANG

[  244.447743] INFO: task syz-executor2:14507 blocked for more than 120 seconds.
[  244.455167]       Not tainted 4.9.40-ged32335 #11
[  244.460033] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  244.468151] syz-executor2   D27168 14507   3322 0x00000002
[  244.473864]  ffff8801a51c4680 ffff88019c120fc0 ffff88019c1224c0 ffff88019f74c680
[  244.481834]  ffff8801db321498 ffff8801c844f778 ffffffff8388f2bb 0000000000000000
[  244.489886]  0000000000000007 00ff8801a51c4680 ffff8801db321db0 ffff8801db321dd8
[  244.497869] Call Trace:
[  244.500425]  [<ffffffff8388f2bb>] ? __schedule+0x67b/0x1ba0
[  244.506100]  [<ffffffff83890872>] schedule+0x92/0x1b0
[  244.511304]  [<ffffffff838911e3>] schedule_preempt_disabled+0x13/0x20
[  244.517906]  [<ffffffff838967f2>] mutex_lock_nested+0x312/0x870
[  244.523933]  [<ffffffff8162804a>] ? blkdev_put+0x2a/0x550
[  244.529459]  [<ffffffff838964e0>] ? mutex_lock_killable_nested+0x960/0x960
[  244.536445]  [<ffffffff8166e69b>] ? locks_remove_file+0x32b/0x420
[  244.542690]  [<ffffffff8163cab6>] ? fsnotify+0x86/0xf30
[  244.548048]  [<ffffffff81628570>] ? blkdev_put+0x550/0x550
[  244.553641]  [<ffffffff8162804a>] blkdev_put+0x2a/0x550
[  244.559031]  [<ffffffff81628570>] ? blkdev_put+0x550/0x550
[  244.564630]  [<ffffffff816285fb>] blkdev_close+0x8b/0xb0
[  244.570099]  [<ffffffff8156ee2c>] __fput+0x28c/0x6e0
[  244.575170]  [<ffffffff8156f305>] ____fput+0x15/0x20
[  244.580276]  [<ffffffff81195e25>] task_work_run+0x115/0x190
[  244.585960]  [<ffffffff8113cf76>] do_exit+0x826/0x2a40
[  244.622863]  [<ffffffff81143658>] do_group_exit+0x108/0x320
[  244.628582]  [<ffffffff8116628c>] get_signal+0x55c/0x1600
[  244.634086]  [<ffffffff81052b97>] do_signal+0x87/0x1960
[  244.674628]  [<ffffffff81003a35>] exit_to_usermode_loop+0xe5/0x130
[  244.680946]  [<ffffffff81006350>] syscall_return_slowpath+0x1a0/0x1e0
[  244.687490]  [<ffffffff838a0766>] entry_SYSCALL_64_fastpath+0xc4/0xc6
