INFO: task syz-executor.0:324 blocked for more than 140 seconds.
      Not tainted 4.9.169+ #43
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0  D29640   324   2110 0x00000004
 ffff8801c7f52f80 ffff8801b43bcd00 ffff8801db621000 ffff8801c9545f00
 ffff8801db621018 ffff880184097c90 ffffffff8280152e ffffffff8280d93c
 ffff8801c8c93aa8 00ff880184097be0 ffff8801db6218f0 1ffff10030812f81
Call Trace:
 [<00000000b857819e>] schedule+0x92/0x1c0 kernel/sched/core.c:3546
 [<000000009baf1be1>] rwsem_down_read_failed+0x258/0x3e0 kernel/locking/rwsem-xadd.c:267
 [<000000007544d86b>] call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
 [<0000000059f49a6f>] __down_read arch/x86/include/asm/rwsem.h:65 [inline]
 [<0000000059f49a6f>] down_read+0x52/0xb0 kernel/locking/rwsem.c:24
 [<00000000864f6c97>] __do_page_fault+0x7bd/0xa60 arch/x86/mm/fault.c:1342
 [<000000006d15ae9d>] do_page_fault+0x28/0x30 arch/x86/mm/fault.c:1469
 [<00000000d6452bd4>] page_fault+0x25/0x30 arch/x86/entry/entry_64.S:951

Showing all locks held in the system:
2 locks held by khungtaskd/24:
 #0:  (rcu_read_lock){......}, at: [<0000000051a7daa7>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<0000000051a7daa7>] watchdog+0x13c/0xae0 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.?..}, at: [<000000009ef07205>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4339
1 lock held by rsyslogd/1911:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<0000000091df7074>] __fdget_pos+0xa8/0xd0 fs/file.c:782
2 locks held by getty/2039:
 #0:  (&tty->ldisc_sem){++++++}, at: [<000000005fa72966>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&ldata->atomic_read_lock){+.+.+.}, at: [<000000001c3bf10f>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156
1 lock held by syz-executor.0/324:
 #0:  (&mm->mmap_sem){++++++}, at: [<00000000864f6c97>] __do_page_fault+0x7bd/0xa60 arch/x86/mm/fault.c:1342
1 lock held by syz-executor.0/325:
 #0:  (&mm->mmap_sem){++++++}, at: [<0000000008d79614>] exit_mm kernel/exit.c:480 [inline]
 #0:  (&mm->mmap_sem){++++++}, at: [<0000000008d79614>] do_exit+0x3b7/0x2aa0 kernel/exit.c:828

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

NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.169+ #43
 ffff8801d98d7cc8 ffffffff81b4f7f1 0000000000000001 0000000000000000
 0000000000000001 ffffffff81097401 dffffc0000000000 ffff8801d98d7d00
 ffffffff81b5aa8c 0000000000000001 0000000000000000 0000000000000001
Call Trace:
 [<000000008abc68b9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<000000008abc68b9>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<000000009516bc4c>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99
 [<0000000075222336>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60
 [<00000000156c5a5f>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<00000000bfdebe96>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<00000000bfdebe96>] check_hung_task kernel/hung_task.c:125 [inline]
 [<00000000bfdebe96>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<00000000bfdebe96>] watchdog+0x661/0xae0 kernel/hung_task.c:239
 [<00000000de70c7d4>] kthread+0x278/0x310 kernel/kthread.c:211
 [<00000000253ad6d5>] 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
CPU: 0 PID: 29277 Comm: syz-executor.2 Not tainted 4.9.169+ #43
task: 000000000e647e9d task.stack: 00000000110102b5
RIP: 0033:[<0000000000401584>] 
c [<0000000084ade5dc>] 0x401584
RSP: 002b:00007f0970d45690  EFLAGS: 00000202
RAX: 000000007fe3953d RBX: 000000000000000b RCX: 0000000000458c29
RDX: 0000000000000000 RSI: 00007f0970d456c0 RDI: 000000000000000b
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f0970d46700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c420467e80 CR3: 00000001a9cb1000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600