INFO: task syz-executor.2:2132 blocked for more than 140 seconds.
      Not tainted 4.9.170+ #45
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2  D25016  2132      1 0x00000004
 ffff8801d7830000 ffff8801d1779600 ffff8801db621000 ffff8801d1412f80
 ffff8801db621018 ffff8801afbefa28 ffffffff8280185e 0000000041b58ab3
 ffffffff82e2b9b0 00ffffff81200360 ffff8801db6218f0 1ffff10035f7df34
Call Trace:
 [<00000000d1ea88d4>] schedule+0x92/0x1c0 kernel/sched/core.c:3546
 [<00000000be5614a0>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579
 [<00000000fc4cfaf7>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<00000000fc4cfaf7>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621
 [<0000000065140069>] lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405
 [<00000000c9ea8747>] __blkdev_driver_ioctl block/ioctl.c:294 [inline]
 [<00000000c9ea8747>] blkdev_ioctl+0xe14/0x19e0 block/ioctl.c:590
 [<00000000e51c422d>] block_ioctl+0xde/0x120 fs/block_dev.c:1696
 [<00000000da9a1fd5>] vfs_ioctl fs/ioctl.c:43 [inline]
 [<00000000da9a1fd5>] file_ioctl fs/ioctl.c:493 [inline]
 [<00000000da9a1fd5>] do_vfs_ioctl+0xb87/0x11d0 fs/ioctl.c:677
 [<00000000a16988b8>] SYSC_ioctl fs/ioctl.c:694 [inline]
 [<00000000a16988b8>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685
 [<00000000568f5c83>] do_syscall_64+0x1ad/0x570 arch/x86/entry/common.c:285
 [<0000000017de6d5f>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:
2 locks held by khungtaskd/24:
 #0:  (rcu_read_lock){......}, at: [<00000000d8d263b5>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline]
 #0:  (rcu_read_lock){......}, at: [<00000000d8d263b5>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263
 #1:  (tasklist_lock){.+.+..}, at: [<00000000069167bb>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4339
1 lock held by rsyslogd/1916:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<000000008c1f53f9>] __fdget_pos+0xa8/0xd0 fs/file.c:782
2 locks held by getty/2044:
 #0:  (&tty->ldisc_sem){++++++}, at: [<00000000e180c7db>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<000000008ee0da75>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156
1 lock held by syz-executor.2/2132:
 #0:  (loop_ctl_mutex/1){+.+.+.}, at: [<0000000065140069>] lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405
2 locks held by syz-executor.4/2135:
 #0:  (loop_ctl_mutex/1){+.+.+.}, at: [<0000000065140069>] lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405
 #1:  (&bdev->bd_mutex){+.+.+.}, at: [<0000000031f5f078>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:189
2 locks held by syz-executor.3/2139:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<0000000063ce46a7>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
 #1:  (loop_index_mutex){+.+.+.}, at: [<000000001fecfc92>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622
1 lock held by blkid/8768:
 #0:  (loop_ctl_mutex/1){+.+.+.}, at: [<0000000065140069>] lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405
1 lock held by blkid/8769:
 #0:  (loop_ctl_mutex/1){+.+.+.}, at: [<0000000065140069>] lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405
2 locks held by syz-executor.1/8779:
 #0:  (loop_index_mutex){+.+.+.}, at: [<0000000021f005a1>] loop_control_ioctl+0x7a/0x2f0 drivers/block/loop.c:1973
 #1:  (loop_ctl_mutex#2){+.+.+.}, at: [<0000000093e9e8d3>] loop_control_ioctl+0x177/0x2f0 drivers/block/loop.c:1987
1 lock held by syz-executor.1/8824:
 #0:  (loop_index_mutex){+.+.+.}, at: [<0000000021f005a1>] loop_control_ioctl+0x7a/0x2f0 drivers/block/loop.c:1973
1 lock held by blkid/8772:
 #0:  (loop_ctl_mutex/1){+.+.+.}, at: [<0000000065140069>] lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405
1 lock held by syz-executor.5/8776:
 #0:  (loop_ctl_mutex/1){+.+.+.}, at: [<0000000065140069>] lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405
2 locks held by blkid/8778:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<0000000063ce46a7>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
 #1:  (loop_index_mutex){+.+.+.}, at: [<000000001fecfc92>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.170+ #45
 ffff8801d98d7cc8 ffffffff81b4fb21 0000000000000001 0000000000000000
 0000000000000001 ffffffff81097401 dffffc0000000000 ffff8801d98d7d00
 ffffffff81b5adbc 0000000000000001 0000000000000000 0000000000000001
Call Trace:
 [<000000009f7d72da>] __dump_stack lib/dump_stack.c:15 [inline]
 [<000000009f7d72da>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<000000003bd4d724>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99
 [<000000001ccaeccc>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60
 [<000000006e3be545>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<00000000782881b4>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<00000000782881b4>] check_hung_task kernel/hung_task.c:126 [inline]
 [<00000000782881b4>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline]
 [<00000000782881b4>] watchdog+0x670/0xaf0 kernel/hung_task.c:263
 [<000000007f393f52>] kthread+0x278/0x310 kernel/kthread.c:211
 [<0000000053ff2c52>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff828108d2