IPVS: Creating netns size=2552 id=4
IPVS: stopping backup sync thread 3983 ...
INFO: task syz-executor7:3942 blocked for more than 120 seconds.
      Not tainted 4.4.124-g851fb4d #18
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor7   D ffff8801d689fbc8 28888  3942      1 0x20020004
 ffff8801d689fbc8 ffff8801d6f10000 0000000000000000 0000000000000007
 ffff8801d6f10000 ffff8801db31fdb8 ffff8801db31fde0 ffff8801db31f4d8
 ffff8801db31f4c0 ffff8800bbb31800 ffff8801d6f10000 0000000000000000
Call Trace:
 [<ffffffff8376b59a>] schedule+0x7a/0x1b0 kernel/sched/core.c:3359
 [<ffffffff8376bd93>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3392
 [<ffffffff83770356>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff83770356>] mutex_lock_nested+0x306/0x850 kernel/locking/mutex.c:621
 [<ffffffff82e33957>] copy_net_ns+0xc7/0x190 net/core/net_namespace.c:368
 [<ffffffff81192fe6>] create_new_namespaces+0x2f6/0x610 kernel/nsproxy.c:95
 [<ffffffff8119389e>] unshare_nsproxy_namespaces+0xae/0x1e0 kernel/nsproxy.c:190
 [<ffffffff8112cb0a>] SYSC_unshare kernel/fork.c:2068 [inline]
 [<ffffffff8112cb0a>] SyS_unshare+0x3da/0x700 kernel/fork.c:2018
 [<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
 [<ffffffff8377b06a>] sysenter_flags_fixed+0xd/0x17
1 lock held by syz-executor7/3942:
 #0:  (net_mutex){+.+.+.}, at: [<ffffffff82e33957>] copy_net_ns+0xc7/0x190 net/core/net_namespace.c:368
Sending NMI to all CPUs:
NMI backtrace for cpu 0
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.4.124-g851fb4d #18
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffffffff84217840 task.stack: ffffffff84200000
RIP: 0010:[<ffffffff811c7cda>]  [<ffffffff811c7cda>] nr_iowait_cpu+0xa/0x80 kernel/sched/core.c:2872
RSP: 0018:ffffffff84207d88  EFLAGS: 00000016
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff812d594a
RDX: 1ffff1003b64339b RSI: ffff8801db219c40 RDI: 0000000000000000
RBP: ffffffff84207dc8 R08: ffff88021fffd018 R09: 000000000000000c
R10: ffffed0043fffa01 R11: 0000000000000000 R12: 000000dfc4622462
R13: 0000000000000000 R14: ffff8801db219cd8 R15: ffff8801db219c40
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdedfa93000 CR3: 00000001d3034000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff812d5982 0000000000242b59 000000dfc4622462 ffff8801db219c40
 000000dfc4622462 ffff8801db219cd0 000000dfc4622462 ffffffff84208000
 ffffffff84207de8 ffffffff812d5e66 ffff8801db219c40 ffff8801db219cb4
Call Trace:
 [<ffffffff812d5e66>] tick_nohz_stop_idle+0x26/0x70 kernel/time/tick-sched.c:460
 [<ffffffff812d809f>] tick_nohz_idle_exit+0x2cf/0x3d0 kernel/time/tick-sched.c:943
 [<ffffffff81221b75>] cpu_idle_loop kernel/sched/idle.c:267 [inline]
 [<ffffffff81221b75>] cpu_startup_entry+0x2a5/0x8f0 kernel/sched/idle.c:301
 [<ffffffff83766529>] rest_init+0x189/0x190 init/main.c:410
 [<ffffffff84823811>] start_kernel+0x6b9/0x6ee init/main.c:682
 [<ffffffff84822312>] x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:196
 [<ffffffff84822454>] x86_64_start_kernel+0x140/0x163 arch/x86/kernel/head64.c:185
Code: ff 48 c7 c7 64 df 7e 84 48 89 45 d0 e8 70 72 33 00 48 8b 45 d0 eb 8d 66 2e 0f 1f 84 00 00 00 00 00 48 b8 00 00 00 00 00 fc ff df <55> 48 89 e5 41 54 4c 63 e7 4a 8d 3c e5 40 c8 7e 84 53 48 c7 c3 
NMI backtrace for cpu 1
CPU: 1 PID: 486 Comm: khungtaskd Not tainted 4.4.124-g851fb4d #18
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800bacee000 task.stack: ffff8800bacb8000
RIP: 0010:[<ffffffff810c3fa7>]  [<ffffffff810c3fa7>] native_apic_mem_write arch/x86/include/asm/apic.h:94 [inline]
RIP: 0010:[<ffffffff810c3fa7>]  [<ffffffff810c3fa7>] __default_send_IPI_dest_field arch/x86/include/asm/ipi.h:119 [inline]
RIP: 0010:[<ffffffff810c3fa7>]  [<ffffffff810c3fa7>] _flat_send_IPI_mask arch/x86/kernel/apic/apic_flat_64.c:61 [inline]
RIP: 0010:[<ffffffff810c3fa7>]  [<ffffffff810c3fa7>] flat_send_IPI_mask+0xf7/0x1a0 arch/x86/kernel/apic/apic_flat_64.c:69
RSP: 0018:ffff8800bacbfcb8  EFLAGS: 00000046
RAX: 0000000003000000 RBX: 0000000000000c00 RCX: 0000000000000000
RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fb300
RBP: ffff8800bacbfce0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000246
R13: 0000000000000003 R14: ffffffff8426f5a0 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000e13000 CR3: 00000001d3034000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8426f5a0 ffffffff847f09c0 fffffbfff08fdbec dffffc0000000000
 ffff8801db31bca0 ffff8800bacbfd00 ffffffff810b9adb ffffffff839f6e40
 0000000000000003 ffff8800bacbfd60 ffffffff81d115a4 ffffffff8141b803
Call Trace:
 [<ffffffff810b9adb>] nmi_raise_cpu_backtrace+0x5b/0x70 arch/x86/kernel/apic/hw_nmi.c:33
 [<ffffffff81d115a4>] nmi_trigger_all_cpu_backtrace+0x4a4/0x550 lib/nmi_backtrace.c:85
 [<ffffffff810b9b74>] arch_trigger_all_cpu_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 [<ffffffff8136944a>] trigger_all_cpu_backtrace include/linux/nmi.h:44 [inline]
 [<ffffffff8136944a>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8136944a>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8136944a>] watchdog+0x6fa/0xae0 kernel/hung_task.c:238
 [<ffffffff811909c8>] kthread+0x268/0x300 kernel/kthread.c:211
 [<ffffffff83779b15>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:510
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 8b 31 17 00 4c 89 e7 57 9d 0f 1f