audit: type=1400 audit(1575426749.569:1234): avc:  denied  { net_admin } for  pid=17661 comm="syz-executor.2" 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(1575426750.519:1235): avc:  denied  { net_admin } for  pid=2085 comm="syz-executor.5" 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: l0 xmit: Local address not yet configured!
INFO: task syz-executor.3:25590 blocked for more than 140 seconds.
      Not tainted 4.9.141+ #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3  D28296 25590   2091 0x80000002
 ffff8801a69edf00 0000000000000000 ffff8801d3b82c00 ffff8801aa845f00
 ffff8801db721018 ffff88018b61f7a8 ffffffff828075c2 0000000000000000
 ffff8801a69ee7b0 ffffed0034d3dcf5 00ff8801a69edf00 ffff8801db7218f0
Call Trace:
 [<ffffffff82808aef>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff828094a3>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3586
 [<ffffffff8280b51d>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff8280b51d>] mutex_lock_nested+0x38d/0x900 kernel/locking/mutex.c:621
 [<ffffffff81d276f9>] tty_release+0xb79/0xe90 drivers/tty/tty_io.c:1938
 [<ffffffff81510293>] __fput+0x263/0x700 fs/file_table.c:208
 [<ffffffff815107b5>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff8113dc4c>] task_work_run+0x10c/0x180 kernel/task_work.c:116
 [<ffffffff810e6c4d>] exit_task_work include/linux/task_work.h:21 [inline]
 [<ffffffff810e6c4d>] do_exit+0x78d/0x2a50 kernel/exit.c:833
 [<ffffffff810ed3a1>] do_group_exit+0x111/0x300 kernel/exit.c:937
 [<ffffffff8110eb61>] get_signal+0x4e1/0x1460 kernel/signal.c:2321
 [<ffffffff81052aa5>] do_signal+0x95/0x1b00 arch/x86/kernel/signal.c:807
 [<ffffffff81003e2e>] exit_to_usermode_loop+0x10e/0x150 arch/x86/entry/common.c:158
 [<ffffffff81005932>] prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 [<ffffffff81005932>] syscall_return_slowpath arch/x86/entry/common.c:263 [inline]
 [<ffffffff81005932>] do_syscall_64+0x3e2/0x550 arch/x86/entry/common.c:290
 [<ffffffff82817893>] 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: [<ffffffff8131c0cc>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131c0cc>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff813fe63f>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/1900:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff8156cc7c>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/2027:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff82815952>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff81d37362>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
1 lock held by syz-executor.3/25590:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81d276f9>] tty_release+0xb79/0xe90 drivers/tty/tty_io.c:1938
1 lock held by init/29378:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open_by_driver drivers/tty/tty_io.c:2052 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2130
1 lock held by init/29379:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open_by_driver drivers/tty/tty_io.c:2052 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2130
1 lock held by init/29380:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open_by_driver drivers/tty/tty_io.c:2052 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2130
1 lock held by init/29381:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open_by_driver drivers/tty/tty_io.c:2052 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2130
1 lock held by init/29382:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open_by_driver drivers/tty/tty_io.c:2052 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2130
1 lock held by init/29384:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open_by_driver drivers/tty/tty_io.c:2052 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81d2bb96>] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2130
1 lock held by syz-executor.3/29418:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81d449c7>] ptmx_open+0xf7/0x310 drivers/tty/pty.c:753
1 lock held by syz-executor.3/29420:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81d449c7>] ptmx_open+0xf7/0x310 drivers/tty/pty.c:753

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

NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.141+ #1
 ffff8801d9907d08 ffffffff81b42e79 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810983b0 ffff8801d9907d40
 ffffffff81b4df89 0000000000000001 0000000000000000 0000000000000002
Call Trace:
 [<ffffffff81b42e79>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b42e79>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81b4df89>] nmi_cpu_backtrace.cold.0+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81b4df1c>] nmi_trigger_cpumask_backtrace+0x12c/0x151 lib/nmi_backtrace.c:60
 [<ffffffff810984b4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff8131c65d>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff8131c65d>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8131c65d>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8131c65d>] watchdog+0x6ad/0xa20 kernel/hung_task.c:239
 [<ffffffff81142c3d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff82817a5c>] 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: 23709 Comm: syz-executor.1 Not tainted 4.9.141+ #1
task: ffff88019bd917c0 task.stack: ffff8801aefb0000
RIP: 0010:[<ffffffff81b5235a>] 
c [<ffffffff81b5235a>] radix_tree_lookup_slot+0x9a/0xc0 lib/radix-tree.c:728
RSP: 0018:ffff8801aefb7678  EFLAGS: 00000293
RAX: ffff88018c8d0f10 RBX: 1ffff10035df6ecf RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffffff81b52345 RDI: ffff8801d7c02900
RBP: ffff8801aefb76f0 R08: ffff88019bd920b8 R09: 4703c88318d76938
R10: ffff88019bd917c0 R11: 0000000000000001 R12: ffff88018c8d0f10
R13: 0000000000004a65 R14: dffffc0000000000 R15: ffff8801aefb79a8
FS:  00007fbd8dec9700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffdb24de010 CR3: 000000019ba1c000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000041b58ab3
c ffffffff82e4b13a
c ffffffff81b522c0
c ffffffff8140b7b0
c
 ffff88018c8d0f10
c ffff8801d7c028f8
c 0000000000004a65
c dffffc0000000000
c
 ffff8801aefb79a8
c ffff8801aefb76d0
c ffffffff81ba7f5c
c 11d0f75b1c8c5af2
c
Call Trace:
 [<ffffffff8140b83e>] find_get_entry+0x8e/0x570 mm/filemap.c:1093
 [<ffffffff8140bd51>] find_lock_entry+0x31/0x200 mm/filemap.c:1157
 [<ffffffff81460b1c>] shmem_getpage_gfp+0x19c/0x18f0 mm/shmem.c:1582
 [<ffffffff81465b63>] shmem_getpage mm/shmem.c:123 [inline]
 [<ffffffff81465b63>] shmem_file_read_iter+0x2b3/0xa30 mm/shmem.c:2282
 [<ffffffff815aad1d>] generic_file_splice_read+0x2bd/0x4e0 fs/splice.c:309
 [<ffffffff815ab39c>] do_splice_to+0x10c/0x170 fs/splice.c:899
 [<ffffffff815ab63f>] splice_direct_to_actor+0x23f/0x7e0 fs/splice.c:971
 [<ffffffff815abd83>] do_splice_direct+0x1a3/0x270 fs/splice.c:1080
 [<ffffffff8150d780>] do_sendfile+0x4f0/0xc30 fs/read_write.c:1393
 [<ffffffff8150f864>] SYSC_sendfile64 fs/read_write.c:1454 [inline]
 [<ffffffff8150f864>] SyS_sendfile64+0x144/0x160 fs/read_write.c:1440
 [<ffffffff810056ef>] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285
 [<ffffffff82817893>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
cfd 
cff 
cff 
c48 
c85 
cc0 
c74 
c3d 
ce8 
c24 
c97 
c7c 
cff 
c4c 
c8b 
c65 
ca8 
ce8 
c1b 
c97 
c7c 
cff 
c4c 
c89 
ce0 
c48 
cba 
c00 
c00 
c00 
c00 
c00 
cfc 
cff 
cdf 
c48 
cc7 
c04 
c13 
c00 
c00 
c00 
c00 
c<48> 
c8b 
c75 
ce0 
c65 
c48 
c33 
c34 
c25 
c28 
c00 
c00 
c00 
c75 
c10 
c48 
c83 
cc4 
c60 
c5b 
c41 
c