SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=19742 comm=syz-executor1
INFO: task kworker/0:0:9234 blocked for more than 140 seconds.
      Not tainted 4.9.154+ #25
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/0:0     D27752  9234      2 0x80000000
Workqueue: events linkwatch_event
 ffff8801b2cb17c0 ffff88016fab4200 ffff8801db621000 ffff8801d2cddf00
 ffff8801db621018 ffff8801786afa88 ffffffff828061c6 ffff8801717e0a00
 0000000000000002 ffff8801b2cb2070 0000000000000006 ffff8801db6218f0
Call Trace:
 [<ffffffff82807752>] schedule+0x92/0x1c0 kernel/sched/core.c:3553
 [<ffffffff828080f3>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3586
 [<ffffffff8280a04d>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff8280a04d>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621
 [<ffffffff82342fd7>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70
 [<ffffffff82359c4e>] linkwatch_event+0xe/0x60 net/core/link_watch.c:236
 [<ffffffff8113001b>] process_one_work+0x88b/0x15c0 kernel/workqueue.c:2092
 [<ffffffff8113132f>] worker_thread+0x5df/0x11d0 kernel/workqueue.c:2226
 [<ffffffff81141e18>] kthread+0x278/0x310 kernel/kthread.c:211
 [<ffffffff8281661c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373

Showing all locks held in the system:
2 locks held by khungtaskd/24:
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131b99b>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131b99b>] watchdog+0x11b/0xa40 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.?..}, at: [<ffffffff813fe87b>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4336
2 locks held by getty/2028:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff82814543>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff81d393ce>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156
3 locks held by kworker/0:0/9234:
 #0:  ("events"){.+.+.+}, at: [<ffffffff8112ff20>] process_one_work+0x790/0x15c0 kernel/workqueue.c:2085
 #1:  ((linkwatch_work).work){+.+...}, at: [<ffffffff8112ff5e>] process_one_work+0x7ce/0x15c0 kernel/workqueue.c:2089
 #2:  (rtnl_mutex){+.+.+.}, at: [<ffffffff82342fd7>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70
3 locks held by kworker/1:7/19775:
 #0:  ("%s"("ipv6_addrconf")){.+.+..}, at: [<ffffffff8112ff20>] process_one_work+0x790/0x15c0 kernel/workqueue.c:2085
 #1:  ((addr_chk_work).work){+.+...}, at: [<ffffffff8112ff5e>] process_one_work+0x7ce/0x15c0 kernel/workqueue.c:2089
 #2:  (rtnl_mutex){+.+.+.}, at: [<ffffffff82342fd7>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70

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

NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.154+ #25
 ffff8801d9907cd0 ffffffff81b47411 0000000000000001 0000000000000000
 0000000000000001 ffffffff81097301 00000000003ffd0c ffff8801d9907d08
 ffffffff81b5269c 0000000000000001 0000000000000000 0000000000000001
Call Trace:
 [<ffffffff81b47411>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b47411>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<ffffffff81b5269c>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81b52624>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60
 [<ffffffff81097494>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff8131be77>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff8131be77>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8131be77>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8131be77>] watchdog+0x5f7/0xa40 kernel/hung_task.c:239
 [<ffffffff81141e18>] kthread+0x278/0x310 kernel/kthread.c:211
 [<ffffffff8281661c>] 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: 8915 Comm: syz-executor3 Not tainted 4.9.154+ #25
task: ffff88017a044740 task.stack: ffff8801d7fb8000
RIP: 0033:[<0000000000401594>] 
c [<0000000000401594>] 0x401594
RSP: 002b:00007f9ce4184690  EFLAGS: 00000282
RAX: 00000000888978a1 RBX: 000000000000000b RCX: 0000000000457e39
RDX: 0000000000000000 RSI: 00007f9ce41846c0 RDI: 000000000000000b
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f9ce4185700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000143b3e0 CR3: 00000001d4019000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600