INFO: task systemd-shutdow:1 blocked for more than 143 seconds.
      Not tainted 5.9.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:systemd-shutdow state:D stack:23848 pid:    1 ppid:     0 flags:0x00000000
Call Trace:
 context_switch kernel/sched/core.c:3774 [inline]
 __schedule+0x88f/0x1f00 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: 0033:0x7fb0c84d08c6
Code: Unable to access opcode bytes at RIP 0x7fb0c84d089c.
RSP: 002b:00007ffe710e6ca8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a9
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb0c84d08c6
RDX: 0000000001234567 RSI: 0000000028121969 RDI: fffffffffee1dead
RBP: 00007ffe710e6d38 R08: 0000000000005001 R09: 0000000000000005
R10: 0000000000000002 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 0000565555361150 R15: 00007ffe710e7028

Showing all locks held in the system:
1 lock held by systemd-shutdow/1:
 #0: ffffffff872f0968 (system_transition_mutex){+.+.}-{3:3}, at: __do_sys_reboot+0x1a4/0x3e0 kernel/reboot.c:344
1 lock held by khungtaskd/23:
 #0: ffffffff873fc3a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x264 kernel/locking/lockdep.c:6259
5 locks held by kworker/1:6/3133:

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

NMI backtrace for cpu 1
CPU: 1 PID: 23 Comm: khungtaskd Not tainted 5.9.0-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+0x74/0xb6 lib/nmi_backtrace.c:101
 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+0xd28/0xf70 kernel/hung_task.c:295
 kthread+0x392/0x470 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.9.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__local_bh_disable_ip+0x2d/0x40 kernel/softirq.c:144
Code: b9 cb ec 7e a9 00 00 0f 00 53 75 27 9c 5b fa 65 01 35 a7 cb ec 7e 65 8b 05 a0 cb ec 7e 48 31 c6 f7 c6 00 ff 00 00 74 04 53 9d <5b> c3 e8 9c 58 11 00 eb f5 0f 0b eb d5 66 0f 1f 44 00 00 48 b8 00
RSP: 0018:ffffffff87207c80 EFLAGS: 00000046
RAX: 0000000080000201 RBX: 0000000000000046 RCX: 0000000000000000
RDX: 1ffffffff0e461a6 RSI: 0000000000000001 RDI: ffffffff87230d30
RBP: ffffffff87207cb8 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe710e5d2c CR3: 00000001c53f2000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 local_bh_disable include/linux/bottom_half.h:19 [inline]
 irq_enter_rcu+0xb2/0xd0 kernel/softirq.c:358
 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: 4d ce 83 fb 84 db 75 ac e8 d4 d5 83 fb e8 ff 69 89 fb e9 0c 00 00 00 e8 c5 d5 83 fb 0f 00 2d 9e ac 69 00 e8 b9 d5 83 fb fb f4 <9c> 5b 81 e3 00 02 00 00 fa 31 ff 48 89 de e8 74 ce 83 fb 48 85 db
RSP: 0018:ffffffff87207d60 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 1ffffffff103af21
RDX: ffffffff872304c0 RSI: ffffffff85bb48e7 RDI: ffffffff85bb48d1
RBP: ffff8881d8d49864 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: ffff8881d8d49800 R14: ffff8881d8d49864 R15: ffff8881d6f18004
 acpi_idle_enter+0x337/0x490 drivers/acpi/processor_idle.c:648
 cpuidle_enter_state+0x1a2/0xa80 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_kernel+0x495/0x4b6 init/main.c:1049
 secondary_startup_64_no_verify+0xb8/0xbb