device lo left promiscuous mode
device lo entered promiscuous mode
INFO: task syz-executor1:3839 blocked for more than 120 seconds.
      Not tainted 4.4.125-g38f41ec #21
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor1   D ffff8801d915fb08 27576  3839   3819 0x20020000
 ffff8801d915fb08 ffff8801b4c3e000 0000000000000001 0000000000000007
 ffff8801b4c3e000 ffff8801db21fdb8 ffff8801db21fde0 ffff8801db21f4d8
 ffff8801db21f4c0 ffff8801b3331800 ffff8801b4c3e000 0000000000000000
Call Trace:
 [<ffffffff8376b82a>] schedule+0x7a/0x1b0 kernel/sched/core.c:3359
 [<ffffffff8376c023>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3392
 [<ffffffff837705e6>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff837705e6>] mutex_lock_nested+0x306/0x850 kernel/locking/mutex.c:621
 [<ffffffff82424a8f>] lo_release+0x1f/0x160 drivers/block/loop.c:1601
 [<ffffffff815d4047>] __blkdev_put+0x5f7/0x7e0 fs/block_dev.c:1535
 [<ffffffff815d50a5>] blkdev_put+0x85/0x550 fs/block_dev.c:1600
 [<ffffffff815d55fb>] blkdev_close+0x8b/0xb0 fs/block_dev.c:1607
 [<ffffffff81523f43>] __fput+0x233/0x6d0 fs/file_table.c:208
 [<ffffffff81524465>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff8118bd44>] task_work_run+0x104/0x180 kernel/task_work.c:115
 [<ffffffff8100361d>] tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 [<ffffffff8100361d>] exit_to_usermode_loop+0x13d/0x160 arch/x86/entry/common.c:252
 [<ffffffff81007084>] prepare_exit_to_usermode arch/x86/entry/common.c:283 [inline]
 [<ffffffff81007084>] syscall_return_slowpath arch/x86/entry/common.c:348 [inline]
 [<ffffffff81007084>] do_syscall_32_irqs_on arch/x86/entry/common.c:398 [inline]
 [<ffffffff81007084>] do_fast_syscall_32+0x614/0x8a0 arch/x86/entry/common.c:459
 [<ffffffff8377b2aa>] sysenter_flags_fixed+0xd/0x17
2 locks held by syz-executor1/3839:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff815d3b0c>] __blkdev_put+0xbc/0x7e0 fs/block_dev.c:1516
 #1:  (loop_index_mutex){+.+.+.}, at: [<ffffffff82424a8f>] lo_release+0x1f/0x160 drivers/block/loop.c:1601
Sending NMI to all CPUs:
NMI backtrace for cpu 0
CPU: 0 PID: 487 Comm: khungtaskd Not tainted 4.4.125-g38f41ec #21
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800bac58000 task.stack: ffff8800bb3c8000
RIP: 0010:[<ffffffff810c3f87>]  [<ffffffff810c3f87>] native_apic_mem_write arch/x86/include/asm/apic.h:94 [inline]
RIP: 0010:[<ffffffff810c3f87>]  [<ffffffff810c3f87>] __default_send_IPI_dest_field arch/x86/include/asm/ipi.h:119 [inline]
RIP: 0010:[<ffffffff810c3f87>]  [<ffffffff810c3f87>] _flat_send_IPI_mask arch/x86/kernel/apic/apic_flat_64.c:61 [inline]
RIP: 0010:[<ffffffff810c3f87>]  [<ffffffff810c3f87>] flat_send_IPI_mask+0xf7/0x1a0 arch/x86/kernel/apic/apic_flat_64.c:69
RSP: 0018:ffff8800bb3cfcb8  EFLAGS: 00000046
RAX: 0000000003000000 RBX: 0000000000000c00 RCX: 0000000000000000
RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fb300
RBP: ffff8800bb3cfce0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000246
R13: 0000000000000003 R14: ffffffff8426f5a0 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4d5a010000 CR3: 00000001ce29e000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8426f5a0 ffffffff847f0b40 fffffbfff08fdc1c dffffc0000000000
 ffff8801db31bca0 ffff8800bb3cfd00 ffffffff810b9abb ffffffff839f6dc0
 0000000000000003 ffff8800bb3cfd60 ffffffff81d11764 ffffffff8141b993
Call Trace:
 [<ffffffff810b9abb>] nmi_raise_cpu_backtrace+0x5b/0x70 arch/x86/kernel/apic/hw_nmi.c:33
 [<ffffffff81d11764>] nmi_trigger_all_cpu_backtrace+0x4a4/0x550 lib/nmi_backtrace.c:85
 [<ffffffff810b9b54>] arch_trigger_all_cpu_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 [<ffffffff813695ca>] trigger_all_cpu_backtrace include/linux/nmi.h:44 [inline]
 [<ffffffff813695ca>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff813695ca>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff813695ca>] watchdog+0x6fa/0xae0 kernel/hung_task.c:238
 [<ffffffff81190b48>] kthread+0x268/0x300 kernel/kthread.c:211
 [<ffffffff83779d95>] 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 2b 33 17 00 4c 89 e7 57 9d 0f 1f 
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.125-g38f41ec #21
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d9b49800 task.stack: ffff8801d9b58000
RIP: 0010:[<ffffffff811959ed>]  [<ffffffff811959ed>] rcu_read_lock include/linux/rcupdate.h:862 [inline]
RIP: 0010:[<ffffffff811959ed>]  [<ffffffff811959ed>] __atomic_notifier_call_chain kernel/notifier.c:182 [inline]
RIP: 0010:[<ffffffff811959ed>]  [<ffffffff811959ed>] atomic_notifier_call_chain+0x5d/0x140 kernel/notifier.c:193
RSP: 0018:ffff8801d9b5fdb0  EFLAGS: 00000246
RAX: ffff8801d9b49800 RBX: ffffffff84283ba0 RCX: ffffffff811959e6
RDX: 0000000000000000 RSI: ffff8801d9b4a0e0 RDI: ffff8801d9b4a0dc
RBP: ffff8801d9b5fdd0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 1ffff1003b36bf82 R12: 0000000000000002
R13: 0000000000000000 R14: ffffffff847ecfb8 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000002487000 CR3: 00000001c8da0000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff81195990 0000000000000002 ffffffff847dec48 fffffbfff07088c0
 ffff8801d9b5fde8 ffffffff8112e20e dffffc0000000000 ffff8801d9b5fdf8
 ffffffff8102937f ffff8801d9b5fea8 ffffffff81221cb5 fffffbfff08fda06
Call Trace:
 [<ffffffff8112e20e>] idle_notifier_call_chain+0x1e/0x30 kernel/cpu.c:865
 [<ffffffff8102937f>] __exit_idle arch/x86/kernel/process.c:247 [inline]
 [<ffffffff8102937f>] arch_cpu_idle_exit+0x1f/0x30 arch/x86/kernel/process.c:268
 [<ffffffff81221cb5>] cpu_idle_loop kernel/sched/idle.c:255 [inline]
 [<ffffffff81221cb5>] cpu_startup_entry+0x265/0x8f0 kernel/sched/idle.c:301
 [<ffffffff810adcd4>] start_secondary+0x304/0x3e0 arch/x86/kernel/smpboot.c:242
Code: 00 00 48 c7 c7 e0 db 2b 84 48 c7 04 24 90 59 19 81 e8 78 81 0a 00 e8 e3 09 0f 00 85 c0 74 0e e8 9a bc 1c 00 80 3d bc 5e 64 03 00 <74> 69 e8 8c bc 1c 00 48 8d 7b 38 45 31 c0 4c 89 ea b9 ff ff ff