INFO: task syz-executor.0:2086 blocked for more than 140 seconds.
      Not tainted 4.9.141+ #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0  D25112  2086      1 0x00000004
 ffff8801d07b17c0 ffff8801d07c3700 ffff8801c796bc80 ffff8801d1dcdf00
 ffff8801db721018 ffff8801ac297668 ffffffff828075c2 0000000000000000
 ffff8801d07b2070 ffffed003a0f640d 00ff8801d07b17c0 ffff8801db7218f0
Call Trace:
 [<ffffffff82808aef>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff828094a3>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3586
 [<ffffffff8280b51d>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff8280b51d>] mutex_lock_nested+0x38d/0x900 kernel/locking/mutex.c:621
 [<ffffffff815c89bc>] __blkdev_get+0x10c/0xd60 fs/block_dev.c:1268
 [<ffffffff815cb7ea>] blkdev_get+0x2da/0x920 fs/block_dev.c:1416
 [<ffffffff815cc045>] blkdev_open+0x1a5/0x250 fs/block_dev.c:1571
 [<ffffffff81501e3f>] do_dentry_open+0x3ef/0xc90 fs/open.c:766
 [<ffffffff8150576c>] vfs_open+0x11c/0x210 fs/open.c:879
 [<ffffffff8153c542>] do_last fs/namei.c:3410 [inline]
 [<ffffffff8153c542>] path_openat+0x542/0x2790 fs/namei.c:3534
 [<ffffffff81541617>] do_filp_open+0x197/0x270 fs/namei.c:3568
 [<ffffffff8150617d>] do_sys_open+0x30d/0x5c0 fs/open.c:1072
 [<ffffffff8150645d>] SYSC_open fs/open.c:1090 [inline]
 [<ffffffff8150645d>] SyS_open+0x2d/0x40 fs/open.c:1085
 [<ffffffff810056ef>] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285
 [<ffffffff82817893>] 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: [<ffffffff8131c0cc>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131c0cc>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff813fe63f>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/1894:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff8156cc7c>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/2022:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff82815952>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff81d37362>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
1 lock held by syz-executor.0/2086:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff815c89bc>] __blkdev_get+0x10c/0xd60 fs/block_dev.c:1268
2 locks held by syz-executor.1/2089:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff815c89bc>] __blkdev_get+0x10c/0xd60 fs/block_dev.c:1268
 #1:  (loop_index_mutex){+.+.+.}, at: [<ffffffff81de129b>] lo_open+0x1b/0xa0 drivers/block/loop.c:1589
2 locks held by syz-executor.2/2090:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff815c89bc>] __blkdev_get+0x10c/0xd60 fs/block_dev.c:1268
 #1:  (loop_index_mutex){+.+.+.}, at: [<ffffffff81de129b>] lo_open+0x1b/0xa0 drivers/block/loop.c:1589
2 locks held by syz-executor.3/2091:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff815c89bc>] __blkdev_get+0x10c/0xd60 fs/block_dev.c:1268
 #1:  (loop_index_mutex){+.+.+.}, at: [<ffffffff81de129b>] lo_open+0x1b/0xa0 drivers/block/loop.c:1589
2 locks held by syz-executor.4/4328:
 #0:  (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<ffffffff81de73ac>] lo_ioctl+0x8c/0x1910 drivers/block/loop.c:1372
 #1:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff81b0b9fe>] blkdev_reread_part+0x1e/0x40 block/ioctl.c:189
1 lock held by syz-executor.5/4317:
 #0:  (loop_index_mutex){+.+.+.}, at: [<ffffffff81de91da>] loop_control_ioctl+0x7a/0x300 drivers/block/loop.c:1941
2 locks held by syz-executor.5/4331:
 #0:  (loop_index_mutex){+.+.+.}, at: [<ffffffff81de91da>] loop_control_ioctl+0x7a/0x300 drivers/block/loop.c:1941
 #1:  (&lo->lo_ctl_mutex#2){+.+...}, at: [<ffffffff81de92e6>] loop_control_ioctl+0x186/0x300 drivers/block/loop.c:1955
2 locks held by blkid/4330:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff815c89bc>] __blkdev_get+0x10c/0xd60 fs/block_dev.c:1268
 #1:  (loop_index_mutex){+.+.+.}, at: [<ffffffff81de129b>] lo_open+0x1b/0xa0 drivers/block/loop.c:1589

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

NMI backtrace for cpu 0
CPU: 0 PID: 24 Comm: khungtaskd Not tainted 4.9.141+ #1
 ffff8801d9907d08 ffffffff81b42e79 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810983b0 ffff8801d9907d40
 ffffffff81b4df89 0000000000000000 0000000000000000 0000000000000002
Call Trace:
 [<ffffffff81b42e79>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b42e79>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81b4df89>] nmi_cpu_backtrace.cold.0+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81b4df1c>] nmi_trigger_cpumask_backtrace+0x12c/0x151 lib/nmi_backtrace.c:60
 [<ffffffff810984b4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff8131c65d>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff8131c65d>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8131c65d>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8131c65d>] watchdog+0x6ad/0xa20 kernel/hung_task.c:239
 [<ffffffff81142c3d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff82817a5c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.9.141+ #1
task: ffff8801da6b2f80 task.stack: ffff8801da6d0000
RIP: 0010:[<ffffffff8116741e>] 
c [<ffffffff8116741e>] preempt_count_sub+0x4e/0x170 kernel/sched/core.c:3270
RSP: 0018:ffff8801db707f88  EFLAGS: 00000002
RAX: 0000000000000201 RBX: 0000000000000200 RCX: 0000000000000000
RDX: 0000000000000004 RSI: 0000000000000000 RDI: ffffffff841eb840
RBP: ffff8801db707f90 R08: 0000000000000001 R09: 0000000000000004
R10: ffffed0043fffa09 R11: 0000004305bc5c38 R12: 0000000000000000
R13: 0000000000000001 R14: ffffffff833e7aa0 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000d48f80 CR3: 00000001d05f1000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000000000200
c ffff8801db707fa8
c ffffffff810ef5cc
c ffff8801da6b2f80
c
 ffff8801db707fb8
c ffffffff810ef61c
c ffff8801db707fd0
c ffffffff810efc88
c
 ffffffff833de228
c ffff8801db707fe8
c ffffffff8281a6ca
c ffffffff833de228
c
Call Trace:
 <IRQ> 
d [<ffffffff810ef5cc>] __local_bh_enable+0x3c/0x70 kernel/softirq.c:148
 [<ffffffff810ef61c>] _local_bh_enable+0x1c/0x50 kernel/softirq.c:159
 [<ffffffff810efc88>] irq_enter+0xb8/0xd0 kernel/softirq.c:350
 [<ffffffff8281a6ca>] smp_reschedule_interrupt+0xa/0x90 arch/x86/kernel/smp.c:267
 [<ffffffff828195ad>] reschedule_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:671
 <EOI> 
d [<ffffffff82816496>] ? native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:56
 [<ffffffff828159f5>] arch_safe_halt arch/x86/include/asm/paravirt.h:104 [inline]
 [<ffffffff828159f5>] default_idle+0x55/0x360 arch/x86/kernel/process.c:437
 [<ffffffff81068a40>] arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:428
 [<ffffffff828168f5>] default_idle_call+0x45/0x60 kernel/sched/idle.c:97
 [<ffffffff811f0a85>] cpuidle_idle_call kernel/sched/idle.c:155 [inline]
 [<ffffffff811f0a85>] cpu_idle_loop kernel/sched/idle.c:248 [inline]
 [<ffffffff811f0a85>] cpu_startup_entry+0x2b5/0x380 kernel/sched/idle.c:303
 [<ffffffff8108dc08>] start_secondary+0x328/0x400 arch/x86/kernel/smpboot.c:251
Code: 
c48 
c89 
cf8 
c83 
ce0 
c07 
c83 
cc0 
c03 
c38 
cd0 
c7c 
c08 
c84 
cd2 
c0f 
c85 
c11 
c01 
c00 
c00 
c8b 
c0d 
c32 
c44 
c08 
c03 
c85 
cc9 
c75 
c18 
c65 
c8b 
c05 
c77 
c09 
ceb 
c7e 
c25 
cff 
cff 
cff 
c7f 
c<39> 
cc3 
c7f 
c1b 
c81 
cfb 
cfe 
c00 
c00 
c00 
c76 
c78 
c65 
c8b 
c05 
c5f 
c09 
ceb 
c7e 
cf7 
cdb 
c