INFO: task syz-executor2:6285 blocked for more than 120 seconds.
      Not tainted 4.4.118-g239a415 #26
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor2   D ffff8800a992f928 29512  6285   3850 0x20020004
 ffff8800a992f928 ffff8800ac4be8f0 ffff8800ac4be000 ffffffff8113bd3a
 ffffed00399e1658 ffff8801ccf0b200 ffff8801db21fdb8 ffff8801db21fde0
 ffff8801db21f4d8 ffff8800ad7bb000 ffff8800ac4be000 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
 [<ffffffff831cf67f>] lock_sock include/net/sock.h:1493 [inline]
 [<ffffffff831cf67f>] inet_autobind+0x1f/0x180 net/ipv4/af_inet.c:192
 [<ffffffff831d6db8>] inet_sendmsg+0x3f8/0x4c0 net/ipv4/af_inet.c:752
 [<ffffffff82deb9ba>] sock_sendmsg_nosec net/socket.c:625 [inline]
 [<ffffffff82deb9ba>] sock_sendmsg+0xca/0x110 net/socket.c:635
 [<ffffffff82ded591>] ___sys_sendmsg+0x6c1/0x7c0 net/socket.c:1962
 [<ffffffff82def5e3>] __sys_sendmsg+0xd3/0x190 net/socket.c:1996
 [<ffffffff82ed946a>] C_SYSC_sendmsg net/compat.c:720 [inline]
 [<ffffffff82ed946a>] compat_SyS_sendmsg+0x2a/0x40 net/compat.c:718
 [<ffffffff81006d91>] do_syscall_32_irqs_on arch/x86/entry/common.c:392 [inline]
 [<ffffffff81006d91>] do_fast_syscall_32+0x321/0x8a0 arch/x86/entry/common.c:459
 [<ffffffff837743ea>] sysenter_flags_fixed+0xd/0x17
no locks held by syz-executor2/6285.
Sending NMI to all CPUs:
NMI backtrace for cpu 0
CPU: 0 PID: 485 Comm: khungtaskd Not tainted 4.4.118-g239a415 #26
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800bacde000 task.stack: ffff8800bacf8000
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:ffff8800bacffcb8  EFLAGS: 00000046
RAX: 0000000003000000 RBX: 0000000000000c00 RCX: 0000000000000000
RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fb300
RBP: ffff8800bacffce0 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: 00007f6bff9d09b8 CR3: 00000000ac626000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8426f420 ffffffff847ef9c0 fffffbfff08fd9ec dffffc0000000000
 ffff8801db31bca0 ffff8800bacffd00 ffffffff810b999b ffffffff839f63c0
 0000000000000003 ffff8800bacffd60 ffffffff81d0ef94 0000000000000000
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 #26
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d9b49800 task.stack: ffff8801d9b58000
RIP: 0010:[<ffffffff810d2294>]  [<ffffffff810d2294>] pvclock_clocksource_read+0x34/0x4a0 arch/x86/kernel/pvclock.c:77
RSP: 0018:ffff8801d9b5fcb8  EFLAGS: 00000086
RAX: dffffc0000000000 RBX: ffff88021fffd040 RCX: 1ffff10043fffa08
RDX: 0000000000000000 RSI: ffffffff839fe520 RDI: ffff88021fffd040
RBP: ffff8801d9b5fd40 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 1ffff1003b36bf7a R12: ffffffff85703640
R13: ffff88021fffd043 R14: ffffffff847ebe38 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7b514a7000 CR3: 00000000ac626000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000000000000 0000000000000000 0000000000000002 0000000000000001
 ffff8801d9b5fd60 0000000000000046 0000000000000000 ffff8801d9b5fd30
 ffffffff81d63deb 0000000000000000 000000000000502c ffffffff85703640
Call Trace:
 [<ffffffff810d00e3>] kvm_clock_read+0x23/0x40 arch/x86/kernel/kvmclock.c:91
 [<ffffffff810d0109>] kvm_clock_get_cycles+0x9/0x10 arch/x86/kernel/kvmclock.c:98
 [<ffffffff812c015a>] tk_clock_read kernel/time/timekeeping.c:140 [inline]
 [<ffffffff812c015a>] timekeeping_get_delta kernel/time/timekeeping.c:234 [inline]
 [<ffffffff812c015a>] timekeeping_get_ns kernel/time/timekeeping.c:340 [inline]
 [<ffffffff812c015a>] ktime_get+0xea/0x1d0 kernel/time/timekeeping.c:756
 [<ffffffff812d7743>] tick_nohz_idle_exit+0x153/0x3d0 kernel/time/tick-sched.c:940
 [<ffffffff81221815>] cpu_idle_loop kernel/sched/idle.c:267 [inline]
 [<ffffffff81221815>] cpu_startup_entry+0x2a5/0x8f0 kernel/sched/idle.c:301
 [<ffffffff810adc64>] start_secondary+0x304/0x3e0 arch/x86/kernel/smpboot.c:242
Code: df 55 48 89 fa 48 89 e5 48 c1 ea 03 41 57 41 56 41 55 4c 8d 6f 03 41 54 4c 89 e9 53 48 c1 e9 03 48 89 fb 48 83 ec 60 0f b6 14 02 <0f> b6 04 01 48 89 f9 83 e1 07 38 ca 0f 9e c1 84 d2 0f 95 c2 84