audit: type=1400 audit(1536506581.582:11697): avc:  denied  { net_admin } for  pid=7486 comm="syz-executor6" 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(1536506581.582:11698): avc:  denied  { net_admin } for  pid=7486 comm="syz-executor6" 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-executor2:8169 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-executor2   D29080  8169   2086 0x00000002
 ffff8801d66b0000 ffff8801a9320b00 ffff8801d7259b80 ffff8801a84d97c0
 ffff8801db621018 ffff8801a9ae77a8 ffffffff8277d092 0000000000000000
 ffff8801d66b08b0 ffffed003acd6115 00ff8801d66b0000 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/1897:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff8154c11c>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/2025:
 #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-executor2/8169:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81ccd878>] tty_release+0xa88/0xd00 drivers/tty/tty_io.c:1933
1 lock held by init/19772:
 #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/19773:
 #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/19774:
 #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/19775:
 #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/19776:
 #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/19777:
 #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
 ffff8801d9907d08 ffffffff81af0ae9 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810967d0 ffff8801d9907d40
 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: 15182 Comm: syz-executor7 Not tainted 4.9.125+ #89
task: ffff8801a5b00000 task.stack: ffff88019b3d8000
RIP: 0010:[<ffffffff811fea31>] 
c [<ffffffff811fea31>] trace_hardirqs_on_caller+0x41/0x590 kernel/locking/lockdep.c:2701
RSP: 0018:ffff88019b3dfed0  EFLAGS: 00000097
RAX: 0000000000000003 RBX: 0000000000000001 RCX: 0000000000457099
RDX: 0000000000000004 RSI: ffffffff810053cb RDI: ffffffff82ff0d60
RBP: ffff88019b3dfee0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff810053f8
R13: ffff88019b3dffd0 R14: ffff8801a5b00000 R15: 0000000000000000
FS:  00007f4b949e1700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000002137188 CR3: 00000001c461d000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff88019b3dff58
c 00000000000000ca
c ffff88019b3dfef0
c ffffffff811fef8d
c
 ffff88019b3dff48
c ffffffff810053f8
c 0000000000000000
c 0000000000000000
c
 0000000000000000
c 0000000000000000
c 0000000000000000
c 0000000000000000
c
Call Trace:
 [<ffffffff811fef8d>] trace_hardirqs_on+0xd/0x10 kernel/locking/lockdep.c:2743
 [<ffffffff810053f8>] do_syscall_64+0x48/0x480 arch/x86/entry/common.c:270
 [<ffffffff8278c193>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
c60 
c0d 
cff 
c82 
c48 
c89 
cfa 
c53 
c48 
cc1 
cea 
c03 
c0f 
cb6 
c14 
c02 
c48 
c89 
cf8 
c83 
ce0 
c07 
c83 
cc0 
c03 
c38 
cd0 
c7c 
c08 
c84 
cd2 
c0f 
c85 
cc2 
c03 
c00 
c00 
c8b 
c1d 
c2f 
c23 
cdf 
c01 
c<85> 
cdb 
c0f 
c84 
c30 
c03 
c00 
c00 
c65 
c48 
c8b 
c1c 
c25 
c00 
c7e 
c01 
c00 
c48 
c8d 
cbb 
cac 
c