INFO: task systemd-shutdow:1 blocked for more than 143 seconds. Not tainted 5.10.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:systemd-shutdow state:D stack:22896 pid: 1 ppid: 0 flags:0x00000000 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x909/0x1fd0 kernel/sched/core.c:5078 schedule+0xcb/0x270 kernel/sched/core.c:5157 wait_for_device_probe+0x1be/0x220 drivers/base/dd.c:709 device_shutdown+0x18/0x6d0 drivers/base/core.c:4162 kernel_restart_prepare kernel/reboot.c:76 [inline] kernel_restart+0x61/0xa0 kernel/reboot.c:246 __do_sys_reboot+0x31e/0x3e0 kernel/reboot.c:349 do_syscall_64+0x2d/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f46055018c6 RSP: 002b:00007ffee6124a78 EFLAGS: 00000206 ORIG_RAX: 00000000000000a9 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f46055018c6 RDX: 0000000001234567 RSI: 0000000028121969 RDI: fffffffffee1dead RBP: 00007ffee6124b08 R08: 0000000000002800 R09: 0000000000000005 R10: 0000000000000002 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000000000 R14: 0000555862d08150 R15: 00007ffee6124df8 Showing all locks held in the system: 1 lock held by systemd-shutdow/1: #0: ffffffff8754acc8 (system_transition_mutex){+.+.}-{3:3}, at: __do_sys_reboot+0x1a3/0x3e0 kernel/reboot.c:346 9 locks held by kworker/0:0/5: #0: ffff888103f39138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888103f39138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff888103f39138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff888103f39138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff888103f39138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff888103f39138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x871/0x15c0 kernel/workqueue.c:2246 #1: ffffc9000005fda8 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15c0 kernel/workqueue.c:2250 #2: ffff888109258218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:725 [inline] #2: ffff888109258218 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c5/0x42d0 drivers/usb/core/hub.c:5537 #3: ffff88810fb4d218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:725 [inline] #3: ffff88810fb4d218 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4c0 drivers/base/dd.c:894 #4: ffff88810ba451a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:725 [inline] ffff88810ba451a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4c0 drivers/base/dd.c:894 #5: ffff888112310c60 (&dev->phy_mutex){+.+.}-{3:3}, at: asix_mdio_read+0x9a/0x320 drivers/net/usb/asix_common.c:452 #6: ffff8881f6832fd8 (&rq->lock){-.-.}-{2:2}, at: nohz_newidle_balance kernel/sched/fair.c:10538 [inline] #6: ffff8881f6832fd8 (&rq->lock){-.-.}-{2:2}, at: newidle_balance+0x45c/0xf40 kernel/sched/fair.c:10599 #7: ffffffff8a4f6158 (&obj_hash[i].lock){-.-.}-{2:2}, at: cpu_of kernel/sched/sched.h:1085 [inline] (&obj_hash[i].lock){-.-.}-{2:2}, at: __update_idle_core+0x39/0x470 kernel/sched/fair.c:6042 #8: ffffffff875892d8 (console_owner_lock){..-.}-{2:2}, at: console_lock_spinning_disable_and_check kernel/printk/printk.c:1712 [inline] #8: ffffffff875892d8 (console_owner_lock){..-.}-{2:2}, at: console_unlock+0x693/0xbf0 kernel/printk/printk.c:2555 1 lock held by khungtaskd/1269: #0: ffffffff8767b560 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x295 kernel/locking/lockdep.c:6254 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1269 Comm: khungtaskd Not tainted 5.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x3c/0xef 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+0xe2d/0x1080 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: usb_hub_wq hub_event RIP: 0010:skip_atoi+0x68/0xe0 lib/vsprintf.c:135 Code: 52 38 ff 43 8d 2c b6 48 89 df 48 83 c3 01 48 89 f8 49 89 5d 00 48 89 fa 01 ed 48 c1 e8 03 83 e2 07 42 0f b6 04 20 38 d0 7f 04 <84> c0 75 4b 0f be 43 ff 48 89 da 83 e2 07 44 8d 74 05 d0 48 89 d8 RSP: 0018:ffffc9000005e668 EFLAGS: 00000093 RAX: 0000000000000000 RBX: ffffffff86280163 RCX: ffffc90010817000 RDX: 0000000000000002 RSI: ffffffff8207f2d1 RDI: ffffffff86280162 RBP: 0000000000000000 R08: 0000000000000009 R09: ffffffff820820ca R10: ffffffff82082541 R11: 0000000000000035 R12: dffffc0000000000 R13: ffffc9000005e6d0 R14: 0000000000000000 R15: 0000000000000035 FS: 0000000000000000(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4605aed730 CR3: 0000000007425000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: format_decode+0x8a2/0xb30 lib/vsprintf.c:2387 vsnprintf+0x155/0x14f0 lib/vsprintf.c:2571 sprintf+0xc0/0x100 lib/vsprintf.c:2821 print_time kernel/printk/printk.c:1250 [inline] info_print_prefix+0x248/0x340 kernel/printk/printk.c:1276 record_print_text+0x12a/0x320 kernel/printk/printk.c:1320 console_unlock+0x369/0xbf0 kernel/printk/printk.c:2537 vprintk_emit+0x191/0x3e0 kernel/printk/printk.c:2074 dev_vprintk_emit+0x36e/0x3b2 drivers/base/core.c:4283 dev_printk_emit+0xba/0xf1 drivers/base/core.c:4294 __netdev_printk+0x1c6/0x27a net/core/dev.c:11039 netdev_err+0xd7/0x109 net/core/dev.c:11091 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+0xb70/0x27b0 drivers/net/usb/usbnet.c:1703 usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:396 really_probe+0x2b1/0xe40 drivers/base/dd.c:561 driver_probe_device+0x285/0x3f0 drivers/base/dd.c:745 __device_attach_driver+0x216/0x2d0 drivers/base/dd.c:851 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 __device_attach+0x228/0x4c0 drivers/base/dd.c:919 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xbc4/0x1d90 drivers/base/core.c:3091 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+0x2b1/0xe40 drivers/base/dd.c:561 driver_probe_device+0x285/0x3f0 drivers/base/dd.c:745 __device_attach_driver+0x216/0x2d0 drivers/base/dd.c:851 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 __device_attach+0x228/0x4c0 drivers/base/dd.c:919 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xbc4/0x1d90 drivers/base/core.c:3091 usb_new_device.cold+0x725/0x1057 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+0x98d/0x15c0 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x38c/0x460 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296