INFO: task systemd-shutdow:1 blocked for more than 143 seconds.
      Not tainted 5.10.0-rc4-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:systemd-shutdow state:D stack:23432 pid:    1 ppid:     0 flags:0x00000000
Call Trace:
 context_switch kernel/sched/core.c:3774 [inline]
 __schedule+0x8a2/0x1f30 kernel/sched/core.c:4523
 schedule+0xcb/0x270 kernel/sched/core.c:4601
 wait_for_device_probe+0x1be/0x220 drivers/base/dd.c:702
 device_shutdown+0x18/0x5c0 drivers/base/core.c:4007
 kernel_restart_prepare kernel/reboot.c:76 [inline]
 kernel_restart kernel/reboot.c:246 [inline]
 __do_sys_reboot.cold+0x5d/0x97 kernel/reboot.c:347
 do_syscall_64+0x2d/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7fb9c32e28c6
Code: Unable to access opcode bytes at RIP 0x7fb9c32e289c.
RSP: 002b:00007ffcc60e0178 EFLAGS: 00000206 ORIG_RAX: 00000000000000a9
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb9c32e28c6
RDX: 0000000001234567 RSI: 0000000028121969 RDI: fffffffffee1dead
RBP: 00007ffcc60e0208 R08: 0000000000002800 R09: 0000000000000005
R10: 0000000000000002 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000557c39f76150 R15: 00007ffcc60e04f8

Showing all locks held in the system:
1 lock held by systemd-shutdow/1:
 #0: ffffffff87128928 (system_transition_mutex){+.+.}-{3:3}, at: __do_sys_reboot+0x1a4/0x3e0 kernel/reboot.c:344
1 lock held by khungtaskd/1253:
 #0: ffffffff87249520 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x269 kernel/locking/lockdep.c:6252
5 locks held by kworker/1:7/7917:
 #0: ffff888103ce9538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff888103ce9538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
 #0: ffff888103ce9538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
 #0: ffff888103ce9538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
 #0: ffff888103ce9538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
 #0: ffff888103ce9538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x821/0x1520 kernel/workqueue.c:2243
 #1: ffffc90010df7da8 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x854/0x1520 kernel/workqueue.c:2247
 #2: ffff888108d6b218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:731 [inline]
 #2: ffff888108d6b218 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c5/0x42d0 drivers/usb/core/hub.c:5537
 #3: ffff88810130e218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:731 [inline]
 #3: ffff88810130e218 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4a0 drivers/base/dd.c:887
 #4: ffff88813a4881a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:731 [inline]
 #4: ffff88813a4881a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4a0 drivers/base/dd.c:887

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

NMI backtrace for cpu 0
CPU: 0 PID: 1253 Comm: khungtaskd Not tainted 5.10.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x46/0xe0 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1da/0x200 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline]
 watchdog+0xd32/0xf70 kernel/hung_task.c:294
 kthread+0x38c/0x460 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.10.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:timekeeping_delta_to_ns kernel/time/timekeeping.c:383 [inline]
RIP: 0010:timekeeping_get_ns kernel/time/timekeeping.c:395 [inline]
RIP: 0010:ktime_get+0x134/0x1e0 kernel/time/timekeeping.c:833
Code: e8 a1 d5 0e 00 48 85 ed b8 00 00 00 00 4c 0f 45 e0 e8 e0 dc 0e 00 8b 05 9a 06 f6 05 4c 8b 35 9b 06 f6 05 44 8b 2d 90 06 f6 05 <89> 44 24 0c 8b 2d 32 06 f6 05 89 de 89 ef e8 c9 d4 0e 00 39 dd 0f
RSP: 0018:ffffc900000dfbc0 EFLAGS: 00000093
RAX: 00000000006f4fff RBX: 0000000000092c36 RCX: ffffffff8130055f
RDX: ffff888100293280 RSI: ffffffff81300570 RDI: 0000000000000007
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000fe821c
R13: 0000000000000018 R14: 0038c07ba1d29efc R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881f6b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb9c38ce730 CR3: 0000000007025000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 tick_nohz_irq_enter kernel/time/tick-sched.c:1282 [inline]
 tick_irq_enter+0x7c/0x3a0 kernel/time/tick-sched.c:1303
 irq_enter_rcu+0xb7/0xd0 kernel/softirq.c:359
 sysvec_call_function_single+0x13/0xa0 arch/x86/kernel/smp.c:243
 asm_sysvec_call_function_single+0x12/0x20 arch/x86/include/asm/idtentry.h:639
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:29 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:79 [inline]
RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:169 [inline]
RIP: 0010:acpi_safe_halt drivers/acpi/processor_idle.c:112 [inline]
RIP: 0010:acpi_idle_do_entry+0x1c9/0x250 drivers/acpi/processor_idle.c:517
Code: 6d c1 a1 fb 84 db 75 ac e8 14 c9 a1 fb e8 bf 6f a7 fb e9 0c 00 00 00 e8 05 c9 a1 fb 0f 00 2d 4e 6b 6a 00 e8 f9 c8 a1 fb fb f4 <9c> 5b 81 e3 00 02 00 00 fa 31 ff 48 89 de e8 94 c1 a1 fb 48 85 db
RSP: 0018:ffffc900000dfd18 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 1ffffffff1079741
RDX: ffff888100293280 RSI: ffffffff859d1957 RDI: ffffffff859d1941
RBP: ffff888103c80064 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: ffff888103c80000 R14: ffff888103c80064 R15: ffff888106588804
 acpi_idle_enter+0x355/0x4f0 drivers/acpi/processor_idle.c:648
 cpuidle_enter_state+0x1b1/0xc80 drivers/cpuidle/cpuidle.c:237
 cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:351
 call_cpuidle kernel/sched/idle.c:132 [inline]
 cpuidle_idle_call kernel/sched/idle.c:213 [inline]
 do_idle+0x3d5/0x580 kernel/sched/idle.c:273
 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:369
 start_secondary+0x265/0x340 arch/x86/kernel/smpboot.c:266
 secondary_startup_64_no_verify+0xb0/0xbb