IPVS: Creating netns size=2536 id=27
device lo entered promiscuous mode
IPVS: Creating netns size=2536 id=28
INFO: task loop0:10547 blocked for more than 120 seconds.
      Not tainted 4.9.97-g2bcbbd5 #14
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
loop0           D27080 10547      2 0x00000000
 ffff8801ccb71800 ffff8801d397f9c0 ffff8801cc9cea00 ffff8801cd93c800
 ffff8801db221b98 ffff8801d7026df0 ffffffff839e375d 0000000041b58ab3
 ffffffff843c0c78 ffffffff81234380 0000000000000000 ffff8801db222468
Call Trace:
 [<ffffffff839e4d5f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
 [<ffffffff839f1171>] schedule_timeout+0x861/0xf70 kernel/time/timer.c:1768
 [<ffffffff839e2f3a>] io_schedule_timeout+0x1ba/0x390 kernel/sched/core.c:5180
 [<ffffffff81e4ec4c>] io_schedule include/linux/sched.h:460 [inline]
 [<ffffffff81e4ec4c>] bt_get.isra.8+0x27c/0x780 block/blk-mq-tag.c:141
 [<ffffffff81e4fb5c>] __blk_mq_get_tag block/blk-mq-tag.c:163 [inline]
 [<ffffffff81e4fb5c>] blk_mq_get_tag+0xac/0x220 block/blk-mq-tag.c:192
 [<ffffffff81e3f28a>] __blk_mq_alloc_request+0x2a/0xaa0 block/blk-mq.c:196
 [<ffffffff81e4168b>] blk_mq_map_request.isra.38+0x3ab/0x900 block/blk-mq.c:1207
 [<ffffffff81e49ad6>] blk_sq_make_request+0x1d6/0x1220 block/blk-mq.c:1374
 [<ffffffff81e1ca0e>] generic_make_request+0x20e/0x9b0 block/blk-core.c:2055
 [<ffffffff81e1d260>] submit_bio+0xb0/0x460 block/blk-core.c:2126
 [<ffffffff816410aa>] dio_bio_submit fs/direct-io.c:420 [inline]
 [<ffffffff816410aa>] do_blockdev_direct_IO+0x35da/0x5a80 fs/direct-io.c:1301
 [<ffffffff816435f5>] __blockdev_direct_IO+0xa5/0xd0 fs/direct-io.c:1360
 [<ffffffff8162d1a0>] blkdev_direct_IO+0xa0/0xd0 fs/block_dev.c:183
 [<ffffffff8143c760>] generic_file_read_iter+0x660/0x1a90 mm/filemap.c:1951
 [<ffffffff8162fda5>] blkdev_read_iter+0x105/0x170 fs/block_dev.c:1738
 [<ffffffff825ca893>] lo_rw_aio+0x6b3/0x8a0 drivers/block/loop.c:506
 [<ffffffff825cae57>] do_req_filebacked drivers/block/loop.c:543 [inline]
 [<ffffffff825cae57>] loop_handle_cmd drivers/block/loop.c:1698 [inline]
 [<ffffffff825cae57>] loop_queue_work+0x3d7/0x2320 drivers/block/loop.c:1710
 [<ffffffff8119b139>] kthread_worker_fn+0x249/0x6b0 kernel/kthread.c:627
 [<ffffffff8119ad5d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839f481c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373

Showing all locks held in the system:
2 locks held by khungtaskd/518:
 #0:  (rcu_read_lock){......}, at: [<ffffffff813646ec>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff813646ec>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81423ce0>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/3679:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d579c>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/3775:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f2802>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff8211c8a2>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2133
1 lock held by syz-executor2/10589:
 #0:  (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<ffffffff825c71fb>] lo_ioctl+0x8b/0x1aa0 drivers/block/loop.c:1344
1 lock held by syz-executor0/10584:
 #0:  (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<ffffffff825c71fb>] lo_ioctl+0x8b/0x1aa0 drivers/block/loop.c:1344
1 lock held by syz-executor0/10628:
 #0:  (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<ffffffff825c71fb>] lo_ioctl+0x8b/0x1aa0 drivers/block/loop.c:1344

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

NMI backtrace for cpu 0
CPU: 0 PID: 518 Comm: khungtaskd Not tainted 4.9.97-g2bcbbd5 #14
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d8577d08 ffffffff81eb0b69 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810b7d60 ffff8801d8577d40
 ffffffff81ebbe97 0000000000000000 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb0b69>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb0b69>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebbe97>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebbe2a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b7e64>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81364c84>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81364c84>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81364c84>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81364c84>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119ad5d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839f481c>] 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 4.9.97-g2bcbbd5 #14
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d9a6b000 task.stack: ffff8801d9a80000
RIP: 0010:[<ffffffff8135ca01>] 
c [<ffffffff8135ca01>] __sanitizer_cov_trace_pc+0x1/0x50 kernel/kcov.c:93
RSP: 0018:ffff8801db307f68  EFLAGS: 00000093
RAX: ffff8801d9a6b000 RBX: ffffffff83c74c60 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff812cc9ae RDI: ffffffff83c74c60
RBP: ffff8801db307f80 R08: ffff88021fffd058 R09: 0000000000000004
R10: ffffed0043fffa09 R11: 0000000000000001 R12: ffff8801db31cef4
R13: 00000038e946607d R14: ffff8801db31cf10 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f469d1d6830 CR3: 00000001b598b000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801db307f80
c ffffffff81f1875d
c ffff8801db31ce80
c ffff8801db307fb8
c
 ffffffff812cc9ba
c ffff8801db307fb8
c ffff8801d9a6b000
c 0000000000000000
c
 0000000000000001
c ffffffff84c5db88
c ffff8801db307fd0
c ffffffff81148ed3
c
Call Trace:
 [<ffffffff812cc9ba>] tick_nohz_update_jiffies kernel/time/tick-sched.c:522 [inline]
 [<ffffffff812cc9ba>] tick_nohz_irq_enter kernel/time/tick-sched.c:1148 [inline]
 [<ffffffff812cc9ba>] tick_irq_enter+0x16a/0x220 kernel/time/tick-sched.c:1165
 [<ffffffff81148ed3>] irq_enter+0xb3/0xd0 kernel/softirq.c:345
 [<ffffffff839f8d7a>] smp_reschedule_interrupt+0xa/0x90 arch/x86/kernel/smp.c:267
 [<ffffffff839f6950>] reschedule_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:671
 <EOI> 
d [<ffffffff839f3266>] ? native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:53
 [<ffffffff839f28a5>] arch_safe_halt arch/x86/include/asm/paravirt.h:104 [inline]
 [<ffffffff839f28a5>] default_idle+0x55/0x360 arch/x86/kernel/process.c:295
 [<ffffffff81069fa0>] arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:286
 [<ffffffff839f36c5>] default_idle_call+0x45/0x60 kernel/sched/idle.c:97
 [<ffffffff81220e65>] cpuidle_idle_call kernel/sched/idle.c:155 [inline]
 [<ffffffff81220e65>] cpu_idle_loop kernel/sched/idle.c:248 [inline]
 [<ffffffff81220e65>] cpu_startup_entry+0x2b5/0x380 kernel/sched/idle.c:303
 [<ffffffff810ad1f3>] start_secondary+0x323/0x400 arch/x86/kernel/smpboot.c:254
Code: 
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c00 
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c<48> 
c89 
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c48 
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c04 
c25 
c40 
c7d 
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c65 
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ce2 
c