INFO: task systemd-shutdow:1 blocked for more than 143 seconds. Not tainted 5.10.0-rc1-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:4009 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: 0033:0x7effa6a018c6 Code: Unable to access opcode bytes at RIP 0x7effa6a0189c. RSP: 002b:00007ffdb7afb968 EFLAGS: 00000202 ORIG_RAX: 00000000000000a9 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007effa6a018c6 RDX: 0000000001234567 RSI: 0000000028121969 RDI: fffffffffee1dead RBP: 00007ffdb7afb9f8 R08: 0000000000002800 R09: 0000000000000005 R10: 0000000000000002 R11: 0000000000000202 R12: 0000000000000000 R13: 0000000000000000 R14: 000055b955377150 R15: 00007ffdb7afbce8 Showing all locks held in the system: 1 lock held by systemd-shutdow/1: #0: ffffffff871287a8 (system_transition_mutex){+.+.}-{3:3}, at: __do_sys_reboot+0x1a4/0x3e0 kernel/reboot.c:344 1 lock held by khungtaskd/1264: #0: ffffffff872491e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x269 kernel/locking/lockdep.c:6259 9 locks held by kworker/0:5/7415: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1264 Comm: khungtaskd Not tainted 5.10.0-rc1-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:295 kthread+0x38c/0x460 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: 7415 Comm: kworker/0:5 Not tainted 5.10.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: usb_hub_wq hub_event RIP: 0010:put_dec_trunc8+0x256/0x370 lib/vsprintf.c:223 Code: 89 f8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 80 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 ea 47 0f b7 a4 24 e0 a0 00 86 <48> c1 ea 03 0f b6 14 02 48 89 e8 83 e0 07 83 c0 01 38 d0 7c 04 84 RSP: 0018:ffffc90006476610 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: 0000000000000005 RCX: ffffc9000fb11000 RDX: ffffc900064766d2 RSI: ffffffff82038c22 RDI: ffffffff8600a0ea RBP: ffffc900064766d2 R08: 0000000000000009 R09: ffffc90006476a28 R10: 0000000000000063 R11: 0000000000000000 R12: 0000000000003035 R13: 0000000000000000 R14: ffffc90086476a27 R15: ffffc90006476a29 FS: 0000000000000000(0000) GS:ffff8881f6a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007effa6fed730 CR3: 0000000007025000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: number+0x9e4/0xae0 lib/vsprintf.c:476 vsnprintf+0xf07/0x14f0 lib/vsprintf.c:2684 sprintf+0xc0/0x100 lib/vsprintf.c:2820 print_time kernel/printk/printk.c:1297 [inline] info_print_prefix+0x248/0x340 kernel/printk/printk.c:1323 record_print_text+0x12a/0x320 kernel/printk/printk.c:1367 console_unlock+0x318/0xb90 kernel/printk/printk.c:2484 vprintk_emit+0x1da/0x4d0 kernel/printk/printk.c:2028 dev_vprintk_emit+0x2ea/0x32e drivers/base/core.c:4130 dev_printk_emit+0xba/0xf1 drivers/base/core.c:4141 __netdev_printk+0x1c6/0x27a net/core/dev.c:10946 netdev_err+0xd7/0x109 net/core/dev.c:10998 asix_set_sw_mii drivers/net/usb/asix_common.c:278 [inline] asix_set_sw_mii drivers/net/usb/asix_common.c:272 [inline] asix_mdio_read.cold+0x61/0xa5 drivers/net/usb/asix_common.c:454 asix_get_phyid+0xd1/0x1f0 drivers/net/usb/asix_devices.c:78 ax88772_bind+0x451/0xa90 drivers/net/usb/asix_devices.c:739 usbnet_probe+0xb54/0x2740 drivers/net/usb/usbnet.c:1712 usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:396 really_probe+0x291/0xde0 drivers/base/dd.c:554 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:738 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:844 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 __device_attach+0x228/0x4a0 drivers/base/dd.c:912 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xbb2/0x1ce0 drivers/base/core.c:2938 usb_set_configuration+0x113c/0x1910 drivers/usb/core/message.c:2159 usb_generic_driver_probe+0xba/0x100 drivers/usb/core/generic.c:240 usb_probe_device+0xd9/0x2c0 drivers/usb/core/driver.c:293 really_probe+0x291/0xde0 drivers/base/dd.c:554 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:738 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:844 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 __device_attach+0x228/0x4a0 drivers/base/dd.c:912 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xbb2/0x1ce0 drivers/base/core.c:2938 usb_new_device.cold+0x71d/0xfe9 drivers/usb/core/hub.c:2554 hub_port_connect drivers/usb/core/hub.c:5222 [inline] hub_port_connect_change drivers/usb/core/hub.c:5362 [inline] port_event drivers/usb/core/hub.c:5508 [inline] hub_event+0x2348/0x42d0 drivers/usb/core/hub.c:5590 process_one_work+0x933/0x1520 kernel/workqueue.c:2272 worker_thread+0x64c/0x1120 kernel/workqueue.c:2418 kthread+0x38c/0x460 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296