IPVS: sync thread started: state = BACKUP, mcast_ifn = veth1_to_bond, syncid = 0, id = 0
INFO: task syz-executor0:6900 blocked for more than 120 seconds.
      Not tainted 4.9.101-gaef17a5 #32
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D29416  6900   3822 0x00000004
 ffff8801d7249800 0000000000000000 ffff8801bc4af9c0 ffff8801d9a6b000
 ffff8801db321b98 ffff8801d49879f0 ffffffff839e39bd 0000000000000002
 0000000041b58ab3 ffffffff843b8b43 00ffffff8121f220 ffff8801db322468
Call Trace:
 [<ffffffff839e4fbf>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
 [<ffffffff81e3e704>] blk_mq_freeze_queue_wait+0x114/0x230 block/blk-mq.c:75
 [<ffffffff81e479fd>] blk_freeze_queue block/blk-mq.c:92 [inline]
 [<ffffffff81e479fd>] blk_mq_freeze_queue+0x1d/0x20 block/blk-mq.c:101
 [<ffffffff825c7ed2>] loop_switch drivers/block/loop.c:599 [inline]
 [<ffffffff825c7ed2>] loop_change_fd drivers/block/loop.c:685 [inline]
 [<ffffffff825c7ed2>] lo_ioctl+0x722/0x1aa0 drivers/block/loop.c:1350
 [<ffffffff81e54c06>] __blkdev_driver_ioctl block/ioctl.c:294 [inline]
 [<ffffffff81e54c06>] blkdev_ioctl+0x7b6/0x1a70 block/ioctl.c:590
 [<ffffffff816302fe>] block_ioctl+0xde/0x120 fs/block_dev.c:1688
 [<ffffffff815b052c>] vfs_ioctl fs/ioctl.c:43 [inline]
 [<ffffffff815b052c>] file_ioctl fs/ioctl.c:493 [inline]
 [<ffffffff815b052c>] do_vfs_ioctl+0x1ac/0x11a0 fs/ioctl.c:677
 [<ffffffff815b15af>] SYSC_ioctl fs/ioctl.c:694 [inline]
 [<ffffffff815b15af>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f4893>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:
2 locks held by khungtaskd/519:
 #0:  (rcu_read_lock){......}, at: [<ffffffff8136477c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8136477c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81423c90>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/3622:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d57ac>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/3726:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f2a62>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff8211cd32>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2133
1 lock held by syz-executor0/6900:
 #0:  (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<ffffffff825c783b>] lo_ioctl+0x8b/0x1aa0 drivers/block/loop.c:1344

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

NMI backtrace for cpu 0
CPU: 0 PID: 519 Comm: khungtaskd Not tainted 4.9.101-gaef17a5 #32
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d86afd08 ffffffff81eb1009 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810b7da0 ffff8801d86afd40
 ffffffff81ebc307 0000000000000000 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb1009>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb1009>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebc307>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebc29a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b7ea4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81364d14>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81364d14>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81364d14>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81364d14>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119ad9d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839f4a5c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.9.101-gaef17a5 #32
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d9a6b000 task.stack: ffff8801d9a80000
RIP: 0010:[<ffffffff81238e50>] 
c [<ffffffff81238e50>] variable_test_bit arch/x86/include/asm/bitops.h:318 [inline]
RIP: 0010:[<ffffffff81238e50>] 
c [<ffffffff81238e50>] cpumask_test_cpu include/linux/cpumask.h:315 [inline]
RIP: 0010:[<ffffffff81238e50>] 
c [<ffffffff81238e50>] trace_lock_acquire include/trace/events/lock.h:12 [inline]
RIP: 0010:[<ffffffff81238e50>] 
c [<ffffffff81238e50>] lock_acquire+0xe0/0x3e0 kernel/locking/lockdep.c:3755
RSP: 0018:ffff8801db307ec8  EFLAGS: 00000047
RAX: 0000000000000001 RBX: 0000000000000046 RCX: 0000000000000000
RDX: ffff8801d9a6b000 RSI: 0000000000000000 RDI: ffff8801d9a6b8c4
RBP: ffff8801db307f30 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff85b309c8
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f181ec90000 CR3: 00000001bb1aa000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801d9a6b8c0
c ffff8801db307f10
c ffffffff81f18a6b
c ffffffff846deea0
c
 ffffffff83c6d660
c 0000000000000009
c 0000000000000010
c 0000000100000046
c
 0000000000000093
c ffff8801db31cef4
c ffffffff85b309c0
c ffff8801db31cf10
c
Call Trace:
 [<ffffffff812b530a>] seqcount_lockdep_reader_access include/linux/seqlock.h:80 [inline]
 [<ffffffff812b530a>] read_seqcount_begin include/linux/seqlock.h:163 [inline]
 [<ffffffff812b530a>] ktime_get+0x11a/0x1e0 kernel/time/timekeeping.c:757
 [<ffffffff812cc95c>] tick_nohz_irq_enter kernel/time/tick-sched.c:1144 [inline]
 [<ffffffff812cc95c>] tick_irq_enter+0xcc/0x220 kernel/time/tick-sched.c:1165
 [<ffffffff81148f13>] irq_enter+0xb3/0xd0 kernel/softirq.c:345
 [<ffffffff839f8fba>] smp_reschedule_interrupt+0xa/0x90 arch/x86/kernel/smp.c:267
 [<ffffffff839f6b90>] reschedule_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:671
 <EOI> 
d [<ffffffff839f34c6>] ? native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:53
 [<ffffffff839f2b05>] arch_safe_halt arch/x86/include/asm/paravirt.h:104 [inline]
 [<ffffffff839f2b05>] default_idle+0x55/0x360 arch/x86/kernel/process.c:295
 [<ffffffff81069fa0>] arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:286
 [<ffffffff839f3925>] default_idle_call+0x45/0x60 kernel/sched/idle.c:97
 [<ffffffff81220ea5>] cpuidle_idle_call kernel/sched/idle.c:155 [inline]
 [<ffffffff81220ea5>] cpu_idle_loop kernel/sched/idle.c:248 [inline]
 [<ffffffff81220ea5>] cpu_startup_entry+0x2b5/0x380 kernel/sched/idle.c:303
 [<ffffffff810ad1f3>] start_secondary+0x323/0x400 arch/x86/kernel/smpboot.c:254
Code: 
c00 
c00 
cc7 
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c00 
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c05 
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cd2 
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c89 
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c48 
c0f 
ca3 
c05 
ca8 
c50 
ca2 
c03 
c<0f> 
c82 
ca1 
c00 
c00 
c00 
cc7 
c44 
c24 
c18 
c00 
c00 
c00 
c00 
c49 
c89 
cd9 
c4c 
c89 
ce7 
c44 
c