audit: type=1400 audit(1536245518.934:819): avc:  denied  { net_admin } for  pid=2309 comm="syz-executor5" 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(1536245518.934:820): avc:  denied  { net_admin } for  pid=2309 comm="syz-executor5" 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-executor3:12107 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   D29240 12107   2351 0x00000002
 ffff8801ac4597c0 ffff8801d1c02100 ffff8801d1c00000 ffff8801d8178000
 ffff8801db621018 ffff8801a86cf7a8 ffffffff8277d092 0000000000000000
 ffff8801ac45a070 ffffed003588b40d 00ff8801ac4597c0 ffff8801db6218f0
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: [<ffffffff81309abc>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81309abc>] watchdog+0x11c/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/2124:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff8154c11c>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/2251:
 #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-executor3/12107:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81ccd878>] tty_release+0xa88/0xd00 drivers/tty/tty_io.c:1933
1 lock held by syz-executor3/12173:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81ccd878>] tty_release+0xa88/0xd00 drivers/tty/tty_io.c:1933
1 lock held by init/15801:
 #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/15802:
 #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/15803:
 #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/15804:
 #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/15805:
 #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/15806:
 #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 syz-executor3/15851:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81ceaa67>] ptmx_open+0xf7/0x310 drivers/tty/pty.c:753
1 lock held by syz-executor3/15853:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81ceaa67>] ptmx_open+0xf7/0x310 drivers/tty/pty.c:753

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

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: 6343 Comm: syz-executor0 Not tainted 4.9.125+ #89
task: ffff8801cfa10000 task.stack: ffff8801ba3e0000
RIP: 0010:[<ffffffff81309464>] 
c [<ffffffff81309464>] preempt_count arch/x86/include/asm/preempt.h:22 [inline]
RIP: 0010:[<ffffffff81309464>] 
c [<ffffffff81309464>] check_kcov_mode kernel/kcov.c:66 [inline]
RIP: 0010:[<ffffffff81309464>] 
c [<ffffffff81309464>] __sanitizer_cov_trace_pc+0x14/0x50 kernel/kcov.c:100
RSP: 0018:ffff8801ba3e7ca8  EFLAGS: 00000246
RAX: ffff8801cfa10000 RBX: ffff8801ba3e7e48 RCX: 1ffff1003747cffa
RDX: 0000000080000000 RSI: ffff8801ba3e7e48 RDI: 00000000000000ca
RBP: ffff8801ba3e7ca8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801ba3e7d98
R13: dffffc0000000000 R14: ffff8801ba3e7ec8 R15: ffff8801ba3e7e48
FS:  00007f315987c700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f65a05aa000 CR3: 00000001cd70e000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801ba3e7dc0
c ffffffff8130c018
c ffff8801db621018
c ffff8801ba3e7cd0
c
 ffffffff8123afc7
c ffff8801ba3e7d88
c 0000000000000046
c 0000000000000046
c
 000000ca00000000
c 1ffff1003747cf9f
c 0000000041b58ab3
c ffffffff82c2d9e1
c
Call Trace:
 [<ffffffff8130c018>] __seccomp_filter+0x88/0xc80 kernel/seccomp.c:587
 [<ffffffff8130e5d6>] __secure_computing+0xa6/0x290 kernel/seccomp.c:692
 [<ffffffff81004940>] syscall_trace_enter+0x550/0xd20 arch/x86/entry/common.c:117
 [<ffffffff8100566c>] do_syscall_64+0x2bc/0x480 arch/x86/entry/common.c:273
 [<ffffffff8278c193>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
ce8 
c12 
ca2 
c1c 
c00 
ce9 
cf9 
cfe 
cff 
cff 
c66 
c2e 
c0f 
c1f 
c84 
c00 
c00 
c00 
c00 
c00 
c0f 
c1f 
c00 
c55 
c48 
c89 
ce5 
c65 
c48 
c8b 
c04 
c25 
c00 
c7e 
c01 
c00 
c65 
c8b 
c15 
c2c 
ce9 
cd0 
c7e 
c<81> 
ce2 
c00 
c01 
c1f 
c00 
c48 
c8b 
c75 
c08 
c75 
c2b 
c8b 
c90 
c38 
c12 
c00 
c00 
c83 
cfa 
c02 
c