INFO: task systemd-shutdow:1 blocked for more than 143 seconds. Not tainted 5.9.0-rc8-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:systemd-shutdow state:D stack:24096 pid: 1 ppid: 0 flags:0x00000000 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x88f/0x1f80 kernel/sched/core.c:4527 schedule+0xcd/0x2b0 kernel/sched/core.c:4602 wait_for_device_probe+0x1be/0x220 drivers/base/dd.c:702 device_shutdown+0x18/0x5b5 drivers/base/core.c:3994 kernel_restart_prepare kernel/reboot.c:76 [inline] kernel_restart kernel/reboot.c:246 [inline] __do_sys_reboot.cold+0x5d/0x9d kernel/reboot.c:347 do_syscall_64+0x2d/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f7992be68c6 Code: Bad RIP value. RSP: 002b:00007ffcdbaa1af8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a9 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f7992be68c6 RDX: 0000000001234567 RSI: 0000000028121969 RDI: fffffffffee1dead RBP: 00007ffcdbaa1b88 R08: 0000000000005001 R09: 0000000000000005 R10: 0000000000000002 R11: 0000000000000202 R12: 0000000000000000 R13: 0000000000000000 R14: 0000562c31034150 R15: 00007ffcdbaa1e78 Showing all locks held in the system: 1 lock held by systemd-shutdow/1: #0: ffffffff872ea808 (system_transition_mutex){+.+.}-{3:3}, at: __do_sys_reboot+0x1a4/0x3e0 kernel/reboot.c:344 5 locks held by kworker/0:1/12: #0: ffff8881d8904938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8881d8904938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff8881d8904938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff8881d8904938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff8881d8904938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff8881d8904938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x82b/0x15f0 kernel/workqueue.c:2240 #1: ffff8881da24fda8 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x85f/0x15f0 kernel/workqueue.c:2244 #2: ffff8881d4489218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:785 [inline] #2: ffff8881d4489218 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c5/0x42b0 drivers/usb/core/hub.c:5536 #3: ffff8881ca8f7218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:785 [inline] #3: ffff8881ca8f7218 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4a0 drivers/base/dd.c:887 #4: ffff8881a8d821a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:785 [inline] #4: ffff8881a8d821a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4a0 drivers/base/dd.c:887 1 lock held by khungtaskd/23: #0: ffffffff87313c20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x264 kernel/locking/lockdep.c:5852 5 locks held by kworker/0:4/3061: #0: ffff8881d8904938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8881d8904938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff8881d8904938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff8881d8904938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff8881d8904938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff8881d8904938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x82b/0x15f0 kernel/workqueue.c:2240 #1: ffff8881a98ffda8 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x85f/0x15f0 kernel/workqueue.c:2244 #2: ffff8881d4469218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:785 [inline] #2: ffff8881d4469218 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c5/0x42b0 drivers/usb/core/hub.c:5536 #3: ffff8881d8898218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:785 [inline] #3: ffff8881d8898218 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4a0 drivers/base/dd.c:887 #4: ffff8881cb20e1a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:785 [inline] #4: ffff8881cb20e1a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4a0 drivers/base/dd.c:887 5 locks held by kworker/1:5/3318: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 23 Comm: khungtaskd Not tainted 5.9.0-rc8-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+0x107/0x16e lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x74/0xb6 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1da/0x1f4 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+0xd6a/0xfd0 kernel/hung_task.c:295 kthread+0x392/0x470 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 3061 Comm: kworker/0:4 Not tainted 5.9.0-rc8-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: usb_hub_wq hub_event RIP: 0010:lockdep_recursion_finish kernel/locking/lockdep.c:398 [inline] RIP: 0010:lock_is_held_type+0x9f/0xe0 kernel/locking/lockdep.c:5069 Code: ff 41 b8 01 00 00 00 74 12 41 0f b6 47 22 45 31 c0 83 e0 03 44 39 f0 41 0f 94 c0 65 48 8b 14 25 40 ef 01 00 8b 82 9c 08 00 00 <83> e8 01 66 85 c0 89 82 9c 08 00 00 75 23 ff 34 24 9d 48 83 c4 08 RSP: 0018:ffff8881a98fe898 EFLAGS: 00000046 RAX: 0000000000000001 RBX: 0000000000000006 RCX: ffffffff8126c8df RDX: ffff8881aa2f4bc0 RSI: ffffffff87313b60 RDI: ffff8881aa2f5528 RBP: ffff8881aa2f4bc0 R08: 0000000000000000 R09: ffffffff880b938f R10: fffffbfff1017271 R11: 000000000004e017 R12: ffffffff87313b60 R13: ffff8881aa2f5460 R14: 00000000ffffffff R15: ffff8881aa2f5528 FS: 0000000000000000(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f79931d2730 CR3: 0000000007224000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_is_held include/linux/lockdep.h:267 [inline] rcu_read_lock_sched_held+0x3a/0x70 kernel/rcu/update.c:136 trace_lock_release include/trace/events/lock.h:58 [inline] lock_release+0x63c/0x800 kernel/locking/lockdep.c:5040 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:158 [inline] _raw_spin_unlock_irqrestore+0x16/0x40 kernel/locking/spinlock.c:191 spin_unlock_irqrestore include/linux/spinlock.h:409 [inline] dummy_urb_enqueue+0x52b/0x880 drivers/usb/gadget/udc/dummy_hcd.c:1290 usb_hcd_submit_urb+0x2b2/0x22d0 drivers/usb/core/hcd.c:1547 usb_submit_urb+0x6e4/0x14e0 drivers/usb/core/urb.c:585 usb_start_wait_urb+0x101/0x4c0 drivers/usb/core/message.c:58 usb_internal_control_msg drivers/usb/core/message.c:102 [inline] usb_control_msg+0x31c/0x4a0 drivers/usb/core/message.c:153 _usbctrl_vendorreq_sync_read drivers/net/wireless/realtek/rtlwifi/usb.c:104 [inline] _usb_read_sync+0x177/0x2d0 drivers/net/wireless/realtek/rtlwifi/usb.c:141 rtl_read_dword drivers/net/wireless/realtek/rtlwifi/wifi.h:2987 [inline] read_efuse_byte+0x5ef/0x900 drivers/net/wireless/realtek/rtlwifi/efuse.c:182 read_efuse+0x3ab/0xd40 drivers/net/wireless/realtek/rtlwifi/efuse.c:239 efuse_read_all_map drivers/net/wireless/realtek/rtlwifi/efuse.c:648 [inline] rtl_efuse_shadow_map_update+0x1ce/0x240 drivers/net/wireless/realtek/rtlwifi/efuse.c:494 rtl_get_hwinfo+0xac/0x8b0 drivers/net/wireless/realtek/rtlwifi/efuse.c:1224 _rtl92cu_read_adapter_info drivers/net/wireless/realtek/rtlwifi/rtl8192cu/hw.c:334 [inline] rtl92cu_read_eeprom_info+0x2b7/0x1340 drivers/net/wireless/realtek/rtlwifi/rtl8192cu/hw.c:411 rtl_usb_probe+0x7b6/0x13e2 drivers/net/wireless/realtek/rtlwifi/usb.c:1055 usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:396 really_probe+0x291/0xde0 drivers/base/dd.c:553 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:2926 usb_set_configuration+0x1111/0x1880 drivers/usb/core/message.c:2165 usb_generic_driver_probe+0xba/0xf2 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:553 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:2926 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+0x94c/0x15f0 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x392/0x470 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294