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:24160 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: 0033:0x7f26d70b48c6 Code: Unable to access opcode bytes at RIP 0x7f26d70b489c. RSP: 002b:00007ffc0116b628 EFLAGS: 00000206 ORIG_RAX: 00000000000000a9 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f26d70b48c6 RDX: 0000000001234567 RSI: 0000000028121969 RDI: fffffffffee1dead RBP: 00007ffc0116b6b8 R08: 0000000000005001 R09: 0000000000000005 R10: 0000000000000002 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000000000 R14: 000055dadc1c5150 R15: 00007ffc0116b9a8 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 9 locks held by kworker/1:2/131: #0: ffff8881d885a538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8881d885a538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff8881d885a538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff8881d885a538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff8881d885a538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff8881d885a538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x821/0x1520 kernel/workqueue.c:2240 #1: ffff8881cea37da8 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x854/0x1520 kernel/workqueue.c:2244 #2: ffff8881d44a4218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:731 [inline] (&dev->mutex){....}-{3:3}, at: hub_event+0x1c5/0x42b0 drivers/usb/core/hub.c:5536 #3: ffff8881d51d7218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:731 [inline] #3: ffff8881d51d7218 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4a0 drivers/base/dd.c:887 #4: ffff8881d2a301a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:731 [inline] #4: ffff8881d2a301a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4a0 drivers/base/dd.c:887 #5: ffff8881a9274c60 (&dev->phy_mutex){+.+.}-{3:3}, at: asix_mdio_read+0x9a/0x320 drivers/net/usb/asix_common.c:452 #6: ffff8881db332b98 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1292 [inline] #6: ffff8881db332b98 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x220/0x1f00 kernel/sched/core.c:4441 #7: ffffffff89b9f870 (&obj_hash[i].lock){-.-.}-{2:2}, at: cpu_of kernel/sched/sched.h:1072 [inline] ffffffff89b9f870 (&obj_hash[i].lock){-.-.}-{2:2}, at: __update_idle_core+0x39/0x3e0 kernel/sched/fair.c:6018 #8: ffffffff89af7cc0 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0x12e/0x3e0 lib/debugobjects.c:656 ============================================= NMI backtrace for cpu 0 CPU: 0 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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 131 Comm: kworker/1:2 Not tainted 5.9.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: usb_hub_wq hub_event RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:26 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x9/0x60 kernel/kcov.c:197 Code: 00 00 00 4d 8b 0b 48 0f bd c8 49 8b 14 24 48 63 c9 e9 66 ff ff ff 4c 01 ca 49 89 13 e9 12 fd ff ff 65 48 8b 14 25 40 ef 01 00 <65> 8b 05 50 d0 c2 7e a9 00 01 ff 00 48 8b 34 24 74 0f f6 c4 01 74 RSP: 0018:ffff8881cea366c0 EFLAGS: 00000046 RAX: 0000000000000002 RBX: ffffffff8607c52c RCX: ffffffff81f950b0 RDX: ffff8881cea28000 RSI: ffff8881cea28000 RDI: 0000000000000001 RBP: ffff8881cea367e0 R08: 0000000000000009 R09: ffff8881cea36a3e R10: 0000000000000000 R11: 0000000000000007 R12: dffffc0000000000 R13: ffffffff8607c52b R14: 1ffff11039d46cdc R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f26d76a0730 CR3: 0000000007225000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: format_decode+0x225/0xad0 lib/vsprintf.c:2360 vsnprintf+0x155/0x14f0 lib/vsprintf.c:2570 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:4128 dev_printk_emit+0xba/0xf1 drivers/base/core.c:4139 __netdev_printk+0x1c6/0x27a net/core/dev.c:10829 netdev_err+0xd7/0x109 net/core/dev.c:10881 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_phy_reset+0x104/0x170 drivers/net/usb/asix_devices.c:215 ax88172_bind+0x412/0x5d0 drivers/net/usb/asix_devices.c:272 usbnet_probe+0xb47/0x2720 drivers/net/usb/usbnet.c:1738 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+0xb51/0x1c70 drivers/base/core.c:2936 usb_set_configuration+0x1111/0x1880 drivers/usb/core/message.c:2165 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+0xb51/0x1c70 drivers/base/core.c:2936 usb_new_device.cold+0x71d/0xfd4 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+0x2348/0x42b0 drivers/usb/core/hub.c:5590 process_one_work+0x933/0x1520 kernel/workqueue.c:2269 process_scheduled_works kernel/workqueue.c:2331 [inline] worker_thread+0x82b/0x1120 kernel/workqueue.c:2417 kthread+0x392/0x470 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296