INFO: task syz-executor2:9041 blocked for more than 120 seconds.
      Not tainted 4.9.84-ga9d0273 #44
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor2   D26624  9041   3905 0x00000004
 ffff8801d94fe000 ffff8801d77b4540 ffff8801b5c5ea00 ffff8801d77ae000
 ffff8801db221b98 ffff8801b84c7a70 ffffffff838a438b ffff8801d94fe000
 ffffffff8114529a 00fffc0000000000 ffff8801db222468 ffff8801db222490
Call Trace:
 [<ffffffff838a592f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3550
 [<ffffffff82ee4eac>] __lock_sock+0x13c/0x260 net/core/sock.c:2035
 [<ffffffff82ee50c6>] lock_sock_nested+0xf6/0x120 net/core/sock.c:2505
 [<ffffffff83528616>] lock_sock include/net/sock.h:1404 [inline]
 [<ffffffff83528616>] ipv6_getorigdst+0x136/0x610 net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c:238
 [<ffffffff830a301a>] nf_sockopt net/netfilter/nf_sockopt.c:103 [inline]
 [<ffffffff830a301a>] nf_getsockopt+0x6a/0xc0 net/netfilter/nf_sockopt.c:121
 [<ffffffff8347934e>] ipv6_getsockopt+0x1ce/0x250 net/ipv6/ipv6_sockglue.c:1347
 [<ffffffff8322f202>] tcp_getsockopt+0x82/0xd0 net/ipv4/tcp.c:3103
 [<ffffffff82edee85>] sock_common_getsockopt+0x95/0xd0 net/core/sock.c:2665
 [<ffffffff82edc48a>] SYSC_getsockopt net/socket.c:1803 [inline]
 [<ffffffff82edc48a>] SyS_getsockopt+0x14a/0x230 net/socket.c:1785
 [<ffffffff81006504>] do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282
 [<ffffffff838b53fd>] entry_SYSCALL_64_after_swapgs+0x47/0xc5

Showing all locks held in the system:
2 locks held by khungtaskd/515:
 #0:  (rcu_read_lock){......}, at: [<ffffffff813730a5>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff813730a5>] watchdog+0x125/0xa70 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81238190>] debug_show_all_locks+0x70/0x280 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/3659:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d3bef>] __fdget_pos+0x9f/0xc0 fs/file.c:781
2 locks held by getty/3787:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff838b3602>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+.+.}, at: [<ffffffff8200ab14>] n_tty_read+0x1f4/0x16c0 drivers/tty/n_tty.c:2133
1 lock held by syz-executor2/9041:
 #0:  (sk_lock-AF_INET6){+.+.+.}, at: [<ffffffff83479333>] lock_sock include/net/sock.h:1404 [inline]
 #0:  (sk_lock-AF_INET6){+.+.+.}, at: [<ffffffff83479333>] ipv6_getsockopt+0x1b3/0x250 net/ipv6/ipv6_sockglue.c:1346
1 lock held by syz-executor2/9086:
 #0:  (sk_lock-AF_INET6){+.+.+.}, at: [<ffffffff83479333>] lock_sock include/net/sock.h:1404 [inline]
 #0:  (sk_lock-AF_INET6){+.+.+.}, at: [<ffffffff83479333>] ipv6_getsockopt+0x1b3/0x250 net/ipv6/ipv6_sockglue.c:1346

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

NMI backtrace for cpu 1
CPU: 1 PID: 515 Comm: khungtaskd Not tainted 4.9.84-ga9d0273 #44
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d8467d00 ffffffff81d956b9 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810bb190 ffff8801d8467d38
 ffffffff81da07dd 0000000000000001 0000000000000000 ffff8801d94fb418
Call Trace:
 [<ffffffff81d956b9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d956b9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81da07dd>] nmi_cpu_backtrace+0xfd/0x120 lib/nmi_backtrace.c:99
 [<ffffffff81da0917>] nmi_trigger_cpumask_backtrace+0x117/0x190 lib/nmi_backtrace.c:60
 [<ffffffff810bb284>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81373670>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81373670>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81373670>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81373670>] watchdog+0x6f0/0xa70 kernel/hung_task.c:239
 [<ffffffff8119a7bd>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff838b558c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:361
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.84-ga9d0273 #44
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffffffff84429880 task.stack: ffffffff84400000
RIP: 0010:[<ffffffff81208874>] 
c [<ffffffff81208874>] nohz_idle_balance kernel/sched/fair.c:10130 [inline]
RIP: 0010:[<ffffffff81208874>] 
c [<ffffffff81208874>] run_rebalance_domains+0x164/0x540 kernel/sched/fair.c:10281
RSP: 0018:ffff8801db207ec0  EFLAGS: 00000202
RAX: 00000000ffffea2c RBX: ffff8801db200000 RCX: 1ffff1003b64437f
RDX: 0000000000000002 RSI: ffffffff83c18d80 RDI: ffff8801db221bf8
RBP: ffff8801db207f40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801db221b80
R13: 0000000000021b80 R14: ffff8801db221b80 R15: ffffffff84409000
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f52a4f7e9b8 CR3: 00000001b6e98000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff81dfcb1b
c ffffffff8464fe80
c ffffffff842003e0
c 0000000000000246
c
 ffffffff84429880
c 00000000844de0e0
c 0000000000000000
c ffffffff84409100
c
 ffff8801db207f28
c 0000000000000246
c 0000000000000000
c ffffffff84409138
c
Call Trace:
 [<ffffffff838bbed6>] __do_softirq+0x206/0x951 kernel/softirq.c:284
 [<ffffffff81146c45>] invoke_softirq kernel/softirq.c:364 [inline]
 [<ffffffff81146c45>] irq_exit+0x165/0x190 kernel/softirq.c:405
 [<ffffffff838b9afb>] smp_reschedule_interrupt+0x6b/0x80 arch/x86/kernel/smp.c:267
 [<ffffffff838b7710>] reschedule_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:659
 <EOI> 
d [<ffffffff838b4076>] ? native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:53
 [<ffffffff838b36a5>] arch_safe_halt arch/x86/include/asm/paravirt.h:103 [inline]
 [<ffffffff838b36a5>] default_idle+0x55/0x360 arch/x86/kernel/process.c:295
 [<ffffffff8106bc3a>] arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:286
 [<ffffffff838b44b6>] default_idle_call+0x36/0x60 kernel/sched/idle.c:97
 [<ffffffff81226790>] cpuidle_idle_call kernel/sched/idle.c:155 [inline]
 [<ffffffff81226790>] cpu_idle_loop kernel/sched/idle.c:248 [inline]
 [<ffffffff81226790>] cpu_startup_entry+0x2b0/0x380 kernel/sched/idle.c:303
 [<ffffffff838a0fd4>] rest_init+0x184/0x190 init/main.c:408
 [<ffffffff84a6f8b6>] start_kernel+0x688/0x6bd init/main.c:663
 [<ffffffff84a6e29d>] x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:196
 [<ffffffff84a6e3df>] x86_64_start_kernel+0x140/0x163 arch/x86/kernel/head64.c:177
Code: 
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c<48> 
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c