INFO: task systemd-shutdow:1 blocked for more than 143 seconds. Not tainted 5.10.0-rc7-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:3779 [inline] __schedule+0x8a2/0x1f30 kernel/sched/core.c:4528 schedule+0xcb/0x270 kernel/sched/core.c:4606 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: 0033:0x7fd204d008c6 RSP: 002b:00007ffc5995e7f8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a9 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd204d008c6 RDX: 0000000001234567 RSI: 0000000028121969 RDI: fffffffffee1dead RBP: 00007ffc5995e888 R08: 0000000000002800 R09: 0000000000000005 R10: 0000000000000002 R11: 0000000000000202 R12: 0000000000000000 R13: 0000000000000000 R14: 000055a410c75150 R15: 00007ffc5995eb78 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 9 locks held by kworker/1:1/31: #0: ffff888103cd4d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888103cd4d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff888103cd4d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff888103cd4d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff888103cd4d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff888103cd4d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x821/0x1520 kernel/workqueue.c:2243 #1: ffffc900001c7da8 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x854/0x1520 kernel/workqueue.c:2247 #2: ffff888108e02218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:731 [inline] #2: ffff888108e02218 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c5/0x42d0 drivers/usb/core/hub.c:5537 #3: ffff8881186ae218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:731 [inline] #3: ffff8881186ae218 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4a0 drivers/base/dd.c:887 #4: ffff8881020521a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:731 [inline] #4: ffff8881020521a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4a0 drivers/base/dd.c:887 #5: ffff888102e38c60 (&dev->phy_mutex){+.+.}-{3:3}, at: asix_mdio_read+0x9a/0x320 drivers/net/usb/asix_common.c:452 #6: ffff8881f6b32e98 (&rq->lock){-.-.}-{2:2}, at: newidle_balance+0x7a9/0xef0 kernel/sched/fair.c:10597 #7: ffffffff872495a0 (rcu_read_lock){....}-{1:2}, at: cpu_of kernel/sched/sched.h:1072 [inline] #7: ffffffff872495a0 (rcu_read_lock){....}-{1:2}, at: __update_idle_core+0x39/0x440 kernel/sched/fair.c:6019 #8: ffffffff8715b9f8 (console_owner_lock){..-.}-{2:2}, at: console_lock_spinning_disable_and_check kernel/printk/printk.c:1759 [inline] (console_owner_lock){..-.}-{2:2}, at: console_unlock+0x65f/0xb90 kernel/printk/printk.c:2502 1 lock held by khungtaskd/1267: #0: ffffffff872495a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x269 kernel/locking/lockdep.c:6254 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1267 Comm: khungtaskd Not tainted 5.10.0-rc7-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: 31 Comm: kworker/1:1 Not tainted 5.10.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: usb_hub_wq hub_event RIP: 0010:console_unlock+0x1b/0xb90 kernel/printk/printk.c:2395 Code: a4 fb ff ff 90 66 2e 0f 1f 84 00 00 00 00 00 41 57 41 56 49 be 00 00 00 00 00 fc ff df 41 55 41 54 55 53 48 81 ec 40 01 00 00 <48> c7 44 24 40 b3 8a b5 41 48 8d 44 24 40 48 c7 44 24 48 d8 e1 d6 RSP: 0018:ffffc900001c6aa8 EFLAGS: 00000282 RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc9000fb32000 RDX: 0000000000040000 RSI: ffffffff8128d565 RDI: 00000000c8822fa4 RBP: 0000000000000200 R08: 0000000000000000 R09: ffffffff898cc4a7 R10: 0000000000000246 R11: 0000000000000000 R12: 0000000000000057 R13: 0000000000000246 R14: dffffc0000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881f6b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc5995dea8 CR3: 000000012f739000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: vprintk_emit+0x1da/0x4d0 kernel/printk/printk.c:2028 dev_vprintk_emit+0x2ea/0x32e drivers/base/core.c:4128 dev_printk_emit+0xba/0xf1 drivers/base/core.c:4139 __netdev_printk+0x1c6/0x27a net/core/dev.c:10942 netdev_warn+0xd7/0x109 net/core/dev.c:10995 asix_read_cmd.cold+0x3a/0x46 drivers/net/usb/asix_common.c:29 asix_mdio_read+0x149/0x320 drivers/net/usb/asix_common.c:458 asix_phy_reset+0x104/0x170 drivers/net/usb/asix_devices.c:215 ax88172_bind+0x412/0x5d0 drivers/net/usb/asix_devices.c:272 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:2936 usb_set_configuration+0x113c/0x1910 drivers/usb/core/message.c:2164 usb_generic_driver_probe+0xba/0x100 drivers/usb/core/generic.c:238 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:2936 usb_new_device.cold+0x71d/0xfe9 drivers/usb/core/hub.c:2555 hub_port_connect drivers/usb/core/hub.c:5223 [inline] hub_port_connect_change drivers/usb/core/hub.c:5363 [inline] port_event drivers/usb/core/hub.c:5509 [inline] hub_event+0x2348/0x42d0 drivers/usb/core/hub.c:5591 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