INFO: task kworker/1:5:5289 blocked for more than 143 seconds. Not tainted 6.2.0-syzkaller-13467-g0988a0ea7919 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:5 state:D stack:22856 pid:5289 ppid:2 flags:0x00004000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:5304 [inline] __schedule+0xacf/0x2df0 kernel/sched/core.c:6622 schedule+0xde/0x1a0 kernel/sched/core.c:6698 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6757 rwsem_down_write_slowpath+0x3e2/0x1220 kernel/locking/rwsem.c:1178 __down_write_common kernel/locking/rwsem.c:1306 [inline] __down_write kernel/locking/rwsem.c:1315 [inline] down_write+0x1d2/0x200 kernel/locking/rwsem.c:1574 usb_register_dev drivers/usb/core/file.c:187 [inline] usb_register_dev+0x19c/0x830 drivers/usb/core/file.c:156 sisusb_probe+0x209/0xe80 drivers/usb/misc/sisusbvga/sisusbvga.c:2802 usb_probe_interface+0x30f/0x960 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:552 [inline] really_probe+0x240/0xca0 drivers/base/dd.c:631 __driver_probe_device+0x1df/0x4d0 drivers/base/dd.c:768 driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:798 __device_attach_driver+0x1d4/0x2e0 drivers/base/dd.c:926 bus_for_each_drv+0x149/0x1d0 drivers/base/bus.c:457 __device_attach+0x1e4/0x4b0 drivers/base/dd.c:998 bus_probe_device+0x17c/0x1c0 drivers/base/bus.c:532 device_add+0x11c4/0x1c50 drivers/base/core.c:3589 usb_set_configuration+0x10ee/0x1af0 drivers/usb/core/message.c:2171 usb_generic_driver_probe+0xcf/0x130 drivers/usb/core/generic.c:238 usb_probe_device+0xd8/0x2c0 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:552 [inline] really_probe+0x240/0xca0 drivers/base/dd.c:631 __driver_probe_device+0x1df/0x4d0 drivers/base/dd.c:768 driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:798 __device_attach_driver+0x1d4/0x2e0 drivers/base/dd.c:926 bus_for_each_drv+0x149/0x1d0 drivers/base/bus.c:457 __device_attach+0x1e4/0x4b0 drivers/base/dd.c:998 bus_probe_device+0x17c/0x1c0 drivers/base/bus.c:532 device_add+0x11c4/0x1c50 drivers/base/core.c:3589 usb_new_device+0xcb2/0x19d0 drivers/usb/core/hub.c:2575 hub_port_connect drivers/usb/core/hub.c:5407 [inline] hub_port_connect_change drivers/usb/core/hub.c:5551 [inline] port_event drivers/usb/core/hub.c:5711 [inline] hub_event+0x2e3d/0x4ed0 drivers/usb/core/hub.c:5793 process_one_work+0x9bf/0x1820 kernel/workqueue.c:2390 worker_thread+0x669/0x1090 kernel/workqueue.c:2537 kthread+0x2ee/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/11: #0: ffffffff87a9b6d0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 kernel/rcu/tasks.h:510 1 lock held by khungtaskd/25: #0: ffffffff87a9c220 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x340 kernel/locking/lockdep.c:6495 2 locks held by getty/2413: #0: ffff888113610098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x26/0x80 drivers/tty/tty_ldisc.c:244 #1: ffffc900000452f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xef4/0x13e0 drivers/tty/n_tty.c:2177 6 locks held by kworker/1:5/5289: #0: ffff888109033d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888109033d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff888109033d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline] #0: ffff888109033d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:639 [inline] #0: ffff888109033d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:666 [inline] #0: ffff888109033d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x86d/0x1820 kernel/workqueue.c:2361 #1: ffffc90001f07da8 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x8a1/0x1820 kernel/workqueue.c:2365 #2: ffff88810e94e190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:832 [inline] #2: ffff88810e94e190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c0/0x4ed0 drivers/usb/core/hub.c:5739 #3: ffff888110feb190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:832 [inline] #3: ffff888110feb190 (&dev->mutex){....}-{3:3}, at: __device_attach+0x76/0x4b0 drivers/base/dd.c:973 #4: ffff88813b3c1118 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:832 [inline] #4: ffff88813b3c1118 (&dev->mutex){....}-{3:3}, at: __device_attach+0x76/0x4b0 drivers/base/dd.c:973 #5: ffffffff88448550 (minor_rwsem){++++}-{3:3}, at: usb_register_dev drivers/usb/core/file.c:187 [inline] #5: ffffffff88448550 (minor_rwsem){++++}-{3:3}, at: usb_register_dev+0x19c/0x830 drivers/usb/core/file.c:156 2 locks held by syz-executor.3/15473: #0: ffffffff88448550 (minor_rwsem){++++}-{3:3}, at: usb_open+0x28/0x2e0 drivers/usb/core/file.c:39 #1: ffff88810ef8e8d0 (&(sisusb->lock)){+.+.}-{3:3}, at: sisusb_open+0xb6/0x4e0 drivers/usb/misc/sisusbvga/sisusbvga.c:2213 2 locks held by syz-executor.3/15496: #0: ffffffff88448550 (minor_rwsem){++++}-{3:3}, at: usb_open+0x28/0x2e0 drivers/usb/core/file.c:39 #1: ffff88810ef8e8d0 (&(sisusb->lock)){+.+.}-{3:3}, at: sisusb_open+0xb6/0x4e0 drivers/usb/misc/sisusbvga/sisusbvga.c:2213 2 locks held by syz-executor.3/16475: #0: ffffffff88448550 (minor_rwsem){++++}-{3:3}, at: usb_open+0x28/0x2e0 drivers/usb/core/file.c:39 #1: ffff88810ef8e8d0 (&(sisusb->lock)){+.+.}-{3:3}, at: sisusb_open+0xb6/0x4e0 drivers/usb/misc/sisusbvga/sisusbvga.c:2213 2 locks held by syz-executor.3/16476: #0: ffffffff88448550 (minor_rwsem){++++}-{3:3}, at: usb_open+0x28/0x2e0 drivers/usb/core/file.c:39 #1: ffff88810ef8e8d0 (&(sisusb->lock)){+.+.}-{3:3}, at: sisusb_open+0xb6/0x4e0 drivers/usb/misc/sisusbvga/sisusbvga.c:2213 2 locks held by syz-executor.5/16488: #0: ffffffff88448550 (minor_rwsem){++++}-{3:3}, at: usb_open+0x28/0x2e0 drivers/usb/core/file.c:39 #1: ffff88810ef8e8d0 (&(sisusb->lock)){+.+.}-{3:3}, at: sisusb_open+0xb6/0x4e0 drivers/usb/misc/sisusbvga/sisusbvga.c:2213 1 lock held by syz-executor.3/17564: #0: ffffffff88448550 (minor_rwsem){++++}-{3:3}, at: usb_open+0x28/0x2e0 drivers/usb/core/file.c:39 1 lock held by syz-executor.2/17594: #0: ffffffff88448550 (minor_rwsem){++++}-{3:3}, at: usb_open+0x28/0x2e0 drivers/usb/core/file.c:39 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 25 Comm: khungtaskd Not tainted 6.2.0-syzkaller-13467-g0988a0ea7919 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 nmi_cpu_backtrace+0x316/0x3e0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x333/0x440 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline] watchdog+0xe94/0x11e0 kernel/hung_task.c:379 kthread+0x2ee/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline] NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:86 [inline] NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt+0x40/0x50 drivers/acpi/processor_idle.c:112