INFO: task syz-executor4:11356 blocked for more than 120 seconds.
      Not tainted 4.4.118-g239a415 #25
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor4   D ffff8800b7677ad8 29896 11356   3856 0x00000004
 ffff8800b7677ad8 0000000000000006 ffff8800b7a2b000 ffffffff8113bd3a
 ffffed003918f9f0 ffff8801c8c7cf00 ffff8801db31fdb8 ffff8801db31fde0
 ffff8801db31f4d8 ffff8801d694b000 ffff8800b7a2b000 0000000000000000
Call Trace:
 [<ffffffff8376491a>] schedule+0x7a/0x1b0 kernel/sched/core.c:3353
 [<ffffffff82df4161>] __lock_sock+0xf1/0x180 net/core/sock.c:1999
 [<ffffffff82df42e6>] lock_sock_nested+0xf6/0x120 net/core/sock.c:2453
 [<ffffffff833fe486>] lock_sock include/net/sock.h:1493 [inline]
 [<ffffffff833fe486>] ipv6_getorigdst+0x136/0x610 net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c:238
 [<ffffffff82f9680a>] nf_sockopt net/netfilter/nf_sockopt.c:103 [inline]
 [<ffffffff82f9680a>] nf_getsockopt+0x6a/0xc0 net/netfilter/nf_sockopt.c:121
 [<ffffffff833595be>] ipv6_getsockopt+0x1ce/0x250 net/ipv6/ipv6_sockglue.c:1344
 [<ffffffff831194d2>] tcp_getsockopt+0x82/0xd0 net/ipv4/tcp.c:2945
 [<ffffffff82df1b45>] sock_common_getsockopt+0x95/0xd0 net/core/sock.c:2618
 [<ffffffff82def27a>] SYSC_getsockopt net/socket.c:1798 [inline]
 [<ffffffff82def27a>] SyS_getsockopt+0x14a/0x230 net/socket.c:1780
 [<ffffffff83772a5f>] entry_SYSCALL_64_fastpath+0x1c/0x98
1 lock held by syz-executor4/11356:
 #0:  (sk_lock-AF_INET6){+.+.+.}, at: [<ffffffff833595a3>] lock_sock include/net/sock.h:1493 [inline]
 #0:  (sk_lock-AF_INET6){+.+.+.}, at: [<ffffffff833595a3>] ipv6_getsockopt+0x1b3/0x250 net/ipv6/ipv6_sockglue.c:1343
Sending NMI to all CPUs:
NMI backtrace for cpu 0
CPU: 0 PID: 485 Comm: khungtaskd Not tainted 4.4.118-g239a415 #25
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800bac98000 task.stack: ffff8800bbbe8000
RIP: 0010:[<ffffffff810c3e67>]  [<ffffffff810c3e67>] native_apic_mem_write arch/x86/include/asm/apic.h:94 [inline]
RIP: 0010:[<ffffffff810c3e67>]  [<ffffffff810c3e67>] __default_send_IPI_dest_field arch/x86/include/asm/ipi.h:119 [inline]
RIP: 0010:[<ffffffff810c3e67>]  [<ffffffff810c3e67>] _flat_send_IPI_mask arch/x86/kernel/apic/apic_flat_64.c:61 [inline]
RIP: 0010:[<ffffffff810c3e67>]  [<ffffffff810c3e67>] flat_send_IPI_mask+0xf7/0x1a0 arch/x86/kernel/apic/apic_flat_64.c:69
RSP: 0018:ffff8800bbbefcb8  EFLAGS: 00000046
RAX: 0000000003000000 RBX: 0000000000000c00 RCX: 0000000000000000
RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fb300
RBP: ffff8800bbbefce0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000246
R13: 0000000000000003 R14: ffffffff8426f420 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2d3b4d59b8 CR3: 00000001cb234000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8426f420 ffffffff847ef9c0 fffffbfff08fd9ec dffffc0000000000
 ffff8801db31bca0 ffff8800bbbefd00 ffffffff810b999b ffffffff839f63c0
 0000000000000003 ffff8800bbbefd60 ffffffff81d0ef94 ffffffff8141b013
Call Trace:
 [<ffffffff810b999b>] nmi_raise_cpu_backtrace+0x5b/0x70 arch/x86/kernel/apic/hw_nmi.c:33
 [<ffffffff81d0ef94>] nmi_trigger_all_cpu_backtrace+0x4a4/0x550 lib/nmi_backtrace.c:85
 [<ffffffff810b9a34>] arch_trigger_all_cpu_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 [<ffffffff81368c5a>] trigger_all_cpu_backtrace include/linux/nmi.h:44 [inline]
 [<ffffffff81368c5a>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81368c5a>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81368c5a>] watchdog+0x6fa/0xae0 kernel/hung_task.c:238
 [<ffffffff81190788>] kthread+0x268/0x300 kernel/kthread.c:211
 [<ffffffff83772e85>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:506
Code: b3 5f ff f6 c4 10 75 e1 44 89 e8 c1 e0 18 89 04 25 10 b3 5f ff 44 89 fa 09 da 80 cf 04 41 83 ff 02 0f 44 d3 89 14 25 00 b3 5f ff <41> f7 c4 00 02 00 00 74 1a e8 6b 2f 17 00 4c 89 e7 57 9d 0f 1f 
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.118-g239a415 #25
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d9b49800 task.stack: ffff8801d9b58000
RIP: 0010:[<ffffffff81237a36>]  [<ffffffff81237a36>] atomic_inc arch/x86/include/asm/atomic.h:92 [inline]
RIP: 0010:[<ffffffff81237a36>]  [<ffffffff81237a36>] __lock_acquire+0x626/0x4b50 kernel/locking/lockdep.c:3105
RSP: 0018:ffff8801d9b5fb80  EFLAGS: 00000012
RAX: dffffc0000000000 RBX: ffffffff8515f900 RCX: 0000000000000000
RDX: 1ffffffff0857b7d RSI: 0000000000000001 RDI: ffffffff842bdbe8
RBP: ffff8801d9b5fd18 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 1ffff1003b36bf82 R12: 0000000000000000
R13: ffff8801d9b49800 R14: ffffffff842bdbe0 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5f6a331000 CR3: 00000001cb234000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 00000000810b07fa 0000000000000046 ffff8801d9b4a0d0 ffff8801d9b5fbd8
 ffffffff812aec17 ffff8801d9b49800 0000000000000046 0000000000000086
 ffff8801db319640 0000003822157480 ffff8801d9b5fbe0 ffff8801d9b4a0e8
Call Trace:
 [<ffffffff8123d7ce>] lock_acquire+0x15e/0x460 kernel/locking/lockdep.c:3592
 [<ffffffff81195618>] rcu_lock_acquire include/linux/rcupdate.h:477 [inline]
 [<ffffffff81195618>] rcu_read_lock include/linux/rcupdate.h:861 [inline]
 [<ffffffff81195618>] __atomic_notifier_call_chain kernel/notifier.c:182 [inline]
 [<ffffffff81195618>] atomic_notifier_call_chain+0x48/0x140 kernel/notifier.c:193
 [<ffffffff8112df2e>] idle_notifier_call_chain+0x1e/0x30 kernel/cpu.c:865
 [<ffffffff8102939f>] __exit_idle arch/x86/kernel/process.c:247 [inline]
 [<ffffffff8102939f>] arch_cpu_idle_exit+0x1f/0x30 arch/x86/kernel/process.c:268
 [<ffffffff812217d5>] cpu_idle_loop kernel/sched/idle.c:255 [inline]
 [<ffffffff812217d5>] cpu_startup_entry+0x265/0x8f0 kernel/sched/idle.c:301
 [<ffffffff810adc64>] start_secondary+0x304/0x3e0 arch/x86/kernel/smpboot.c:242
Code: 49 8d 7c de 08 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 b6 37 00 00 49 8b 5c de 08 48 85 db 0f 84 28 fb ff ff f0 ff 83 98 01 00 00 <49> 8d 85 c8 08 00 00 48 89 c2 48 89 44 24 68 48 b8 00 00 00 00