audit: type=1400 audit(1536273334.240:106967): avc:  denied  { net_admin } for  pid=2329 comm="syz-executor0" capability=12  scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1
audit: type=1400 audit(1536273334.240:106968): avc:  denied  { net_admin } for  pid=2329 comm="syz-executor0" capability=12  scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1
INFO: task syz-executor3:31183 blocked for more than 140 seconds.
      Not tainted 4.9.125+ #89
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor3   D28856 31183   2328 0x00000002
 ffff8801d485c740 ffff880185aa0580 ffff8801b9f2f380 ffff8801d8bcdf00
 ffff8801db721018 ffff8801aa5b77a8 ffffffff8277d092 0000000000000000
 ffff8801d485cff0 ffffed003a90b9fd 00ff8801d485c740 ffff8801db7218f0
Call Trace:
 [<ffffffff8277e5bf>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff8277ef43>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3586
 [<ffffffff82780bc6>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff82780bc6>] mutex_lock_nested+0x326/0x870 kernel/locking/mutex.c:621
 [<ffffffff81ccd878>] tty_release+0xa88/0xd00 drivers/tty/tty_io.c:1933
 [<ffffffff814f06f3>] __fput+0x263/0x700 fs/file_table.c:208
 [<ffffffff814f0c15>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff81138c4c>] task_work_run+0x10c/0x180 kernel/task_work.c:116
 [<ffffffff810e3cb7>] exit_task_work include/linux/task_work.h:21 [inline]
 [<ffffffff810e3cb7>] do_exit+0x787/0x2750 kernel/exit.c:833
 [<ffffffff810ea111>] do_group_exit+0x111/0x300 kernel/exit.c:937
 [<ffffffff8110b0a1>] get_signal+0x4e1/0x1460 kernel/signal.c:2321
 [<ffffffff81051225>] do_signal+0x95/0x1b00 arch/x86/kernel/signal.c:807
 [<ffffffff81003e2e>] exit_to_usermode_loop+0x10e/0x150 arch/x86/entry/common.c:157
 [<ffffffff8100570d>] prepare_exit_to_usermode arch/x86/entry/common.c:191 [inline]
 [<ffffffff8100570d>] syscall_return_slowpath arch/x86/entry/common.c:260 [inline]
 [<ffffffff8100570d>] do_syscall_64+0x35d/0x480 arch/x86/entry/common.c:287
 [<ffffffff8278c193>] 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: [<ffffffff81309cb0>] rcu_read_unlock include/linux/rcupdate.h:927 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81309cb0>] rcu_lock_break kernel/hung_task.c:143 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81309cb0>] check_hung_uninterruptible_tasks kernel/hung_task.c:177 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81309cb0>] watchdog+0x310/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff813e68fc>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/2133:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff8154c11c>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/2261:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff8278a262>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+.+.}, at: [<ffffffff81cdd442>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
1 lock held by syz-executor3/31183:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81ccd878>] tty_release+0xa88/0xd00 drivers/tty/tty_io.c:1933
1 lock held by init/8729:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81cd1c76>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81cd1c76>] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2125
1 lock held by init/8732:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81cd1c76>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81cd1c76>] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2125
1 lock held by init/8733:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81cd1c76>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81cd1c76>] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2125
1 lock held by init/8734:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81cd1c76>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81cd1c76>] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2125
1 lock held by init/8735:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81cd1c76>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81cd1c76>] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2125
1 lock held by init/8738:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81cd1c76>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81cd1c76>] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2125

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

NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.125+ #89
 ffff8801d94a7d08 ffffffff81af0ae9 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810967d0 ffff8801d94a7d40
 ffffffff81afb849 0000000000000001 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81af0ae9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81af0ae9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81afb849>] nmi_cpu_backtrace.cold.0+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81afb7dc>] nmi_trigger_cpumask_backtrace+0x12c/0x151 lib/nmi_backtrace.c:60
 [<ffffffff810968d4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff8130a04d>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff8130a04d>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8130a04d>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8130a04d>] watchdog+0x6ad/0xa20 kernel/hung_task.c:239
 [<ffffffff8113d9ad>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff8278c35c>] 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: 8721 Comm: syz-executor4 Not tainted 4.9.125+ #89
task: ffff8801b85b0000 task.stack: ffff880186748000
RIP: 0010:[<ffffffff8130948f>] 
c [<ffffffff8130948f>] __sanitizer_cov_trace_pc+0x3f/0x50 kernel/kcov.c:105
RSP: 0018:ffff88018674f8c0  EFLAGS: 00000016
RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc9000776c000
RDX: 0000000000040000 RSI: ffffffff81b54b5b RDI: ffffffff82942ee0
RBP: ffff88018674f8c0 R08: 0000000000000092 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: ffffffff82942ee0
R13: ffffffff82942ea0 R14: ffff8801db61c500 R15: ffff8801d30884a8
FS:  00007f9294da9700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9294d89fc8 CR3: 0000000182d02000 CR4: 00000000001606b0
Stack:
 ffff88018674f900
c ffffffff81b54b5b
c 0000000000000005
c ffffffff82ff0d60
c
 ffff8801d30884a8
c ffff8801db61c500
c ffff8801db61c500
c ffff8801d30884a8
c
 ffff88018674f910
c ffffffff81b54cac
c ffff88018674f930
c ffffffff8123e645
c
Call Trace:
 [<ffffffff81b54b5b>] check_preemption_disabled+0x3b/0x170 lib/smp_processor_id.c:51
 [<ffffffff81b54cac>] debug_smp_processor_id+0x1c/0x20 lib/smp_processor_id.c:56
 [<ffffffff8123e645>] __rcu_is_watching kernel/rcu/tree.c:1053 [inline]
 [<ffffffff8123e645>] rcu_is_watching+0x15/0xa0 kernel/rcu/tree.c:1067
 [<ffffffff8123b14d>] rcu_read_lock_sched_held+0x8d/0x120 kernel/rcu/update.c:107
 [<ffffffff8125fc88>] trace_hrtimer_start include/trace/events/timer.h:176 [inline]
 [<ffffffff8125fc88>] debug_activate kernel/time/hrtimer.c:445 [inline]
 [<ffffffff8125fc88>] enqueue_hrtimer+0x198/0x3a0 kernel/time/hrtimer.c:869
 [<ffffffff81261e73>] hrtimer_start_range_ns+0x573/0x1370 kernel/time/hrtimer.c:995
 [<ffffffff812683a2>] hrtimer_start_expires include/linux/hrtimer.h:407 [inline]
 [<ffffffff812683a2>] hrtimer_restart include/linux/hrtimer.h:412 [inline]
 [<ffffffff812683a2>] schedule_next_timer kernel/time/posix-timers.c:372 [inline]
 [<ffffffff812683a2>] do_schedule_next_timer+0x382/0x500 kernel/time/posix-timers.c:397
 [<ffffffff8110184d>] dequeue_signal+0x13d/0x4b0 kernel/signal.c:632
 [<ffffffff8110ae67>] get_signal+0x2a7/0x1460 kernel/signal.c:2214
 [<ffffffff81051225>] do_signal+0x95/0x1b00 arch/x86/kernel/signal.c:807
 [<ffffffff81003e2e>] exit_to_usermode_loop+0x10e/0x150 arch/x86/entry/common.c:157
 [<ffffffff8100570d>] prepare_exit_to_usermode arch/x86/entry/common.c:191 [inline]
 [<ffffffff8100570d>] syscall_return_slowpath arch/x86/entry/common.c:260 [inline]
 [<ffffffff8100570d>] do_syscall_64+0x35d/0x480 arch/x86/entry/common.c:287
 [<ffffffff8278c193>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
c81 
ce2 
c00 
c01 
c1f 
c00 
c48 
c8b 
c75 
c08 
c75 
c2b 
c8b 
c90 
c38 
c12 
c00 
c00 
c83 
cfa 
c02 
c75 
c20 
c48 
c8b 
c88 
c40 
c12 
c00 
c00 
c8b 
c80 
c3c 
c12 
c00 
c00 
c48 
c8b 
c11 
c48 
c83 
cc2 
c01 
c<48> 
c39 
cd0 
c76 
c07 
c48 
c89 
c34 
cd1 
c48 
c89 
c11 
c5d 
cc3 
c0f 
c1f 
c00 
c55 
cba 
c58 
c00 
c