audit: type=1400 audit(1537702293.867:1358): avc:  denied  { net_admin } for  pid=2093 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
ip6_tunnel: ip6tnl1 xmit: Local address not yet configured!
ip6_tunnel: ip6tnl1 xmit: Local address not yet configured!
INFO: task syz-executor3:14438 blocked for more than 140 seconds.
      Not tainted 4.9.128+ #93
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor3   D29048 14438   2088 0x00000004
 ffff8801d6028000 ffff8801d1a1a100 ffff8801a9522100 ffff8801a97edf00
 ffff8801db721018 ffff8801a7ce7978 ffffffff8277ee02 0000000000000002
 ffff8801d60288b0 ffffed003ac05115 00ff8801d6028000 ffff8801db7218f0
Call Trace:
 [<ffffffff8278032f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff82780cb3>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3586
 [<ffffffff82782936>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff82782936>] mutex_lock_nested+0x326/0x870 kernel/locking/mutex.c:621
 [<ffffffff819c6fba>] sel_write_load+0xba/0xfa0 security/selinux/selinuxfs.c:498
 [<ffffffff814e8a95>] __vfs_write+0x115/0x580 fs/read_write.c:507
 [<ffffffff814eb5a7>] vfs_write+0x187/0x520 fs/read_write.c:557
 [<ffffffff814ef3d9>] SYSC_write fs/read_write.c:604 [inline]
 [<ffffffff814ef3d9>] SyS_write+0xd9/0x1c0 fs/read_write.c:596
 [<ffffffff8100554f>] do_syscall_64+0x19f/0x480 arch/x86/entry/common.c:282
 [<ffffffff8278df13>] 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: [<ffffffff8130a0ac>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8130a0ac>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff813e71ec>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/1893:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff8154c6fc>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/2021:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff8278bfd2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff81cdee72>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
3 locks held by syz-executor3/14438:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff8154c6fc>] __fdget_pos+0xac/0xd0 fs/file.c:781
 #1:  (sb_writers#3){.+.+.+}, at: [<ffffffff814eb80b>] file_start_write include/linux/fs.h:2640 [inline]
 #1:  (sb_writers#3){.+.+.+}, at: [<ffffffff814eb80b>] vfs_write+0x3eb/0x520 fs/read_write.c:556
 #2:  (sel_mutex){+.+.+.}, at: [<ffffffff819c6fba>] sel_write_load+0xba/0xfa0 security/selinux/selinuxfs.c:498
1 lock held by syz-executor3/14444:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff8154c6fc>] __fdget_pos+0xac/0xd0 fs/file.c:781
1 lock held by init/14495:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81cd36a6>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81cd36a6>] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2125
1 lock held by init/14496:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81cd36a6>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81cd36a6>] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2125
1 lock held by init/14497:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81cd36a6>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81cd36a6>] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2125
1 lock held by init/14498:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81cd36a6>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81cd36a6>] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2125
1 lock held by init/14499:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81cd36a6>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81cd36a6>] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2125
1 lock held by init/14500:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81cd36a6>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81cd36a6>] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2125

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

NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.128+ #93
 ffff8801d9907d08 ffffffff81af2469 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810967d0 ffff8801d9907d40
 ffffffff81afd1c9 0000000000000001 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81af2469>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81af2469>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81afd1c9>] nmi_cpu_backtrace.cold.0+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81afd15c>] 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
 [<ffffffff8130a63d>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff8130a63d>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8130a63d>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8130a63d>] watchdog+0x6ad/0xa20 kernel/hung_task.c:239
 [<ffffffff8113e00d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff8278e0dc>] 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: 4295 Comm: syz-executor0 Not tainted 4.9.128+ #93
task: ffff8801a9a2df00 task.stack: ffff8801a9558000
RIP: 0033:[<0000000000457677>] 
c [<0000000000457677>] 0x457677
RSP: 002b:00007f30611efcf8  EFLAGS: 00000246
RAX: 00000000000000ca RBX: 000000000072bf08 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000072bf08
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000072bf0c
R13: 0000000000a3fb9f R14: 00007f30611f09c0 R15: 0000000000000000
FS:  00007f30611f0700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000e813e0 CR3: 00000001d2f42000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400