INFO: task syz-executor.1:2963 blocked for more than 143 seconds. Not tainted 6.3.0-rc6-syzkaller-gced7c981f382 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:28656 pid:2963 ppid:1983 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5307 [inline] __schedule+0xa90/0x2da0 kernel/sched/core.c:6625 schedule+0xde/0x1a0 kernel/sched/core.c:6701 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6760 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0xa3b/0x1350 kernel/locking/mutex.c:747 sisusb_open+0xb6/0x4e0 drivers/usb/misc/sisusbvga/sisusbvga.c:2213 usb_open+0x208/0x2e0 drivers/usb/core/file.c:48 chrdev_open+0x26a/0x770 fs/char_dev.c:414 do_dentry_open+0x6c7/0x12a0 fs/open.c:920 do_open fs/namei.c:3560 [inline] path_openat+0x1baa/0x2750 fs/namei.c:3715 do_filp_open+0x1ba/0x410 fs/namei.c:3742 do_sys_openat2+0x16d/0x4c0 fs/open.c:1348 do_sys_open fs/open.c:1364 [inline] __do_sys_openat fs/open.c:1380 [inline] __se_sys_openat fs/open.c:1375 [inline] __x64_sys_openat+0x143/0x1f0 fs/open.c:1375 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f88b2c882f4 RSP: 002b:00007f88b2048ca0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f88b2df5f80 RCX: 00007f88b2c882f4 RDX: 0000000000000002 RSI: 00007f88b2048d40 RDI: 00000000ffffff9c RBP: 00007f88b2048d40 R08: 0000000000000000 R09: 000000000000000f R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002 R13: 00007fff50b40b0f R14: 00007f88b2049300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/11: #0: ffffffff87c9bb70 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 kernel/rcu/tasks.h:510 1 lock held by rcu_tasks_trace/12: #0: ffffffff87c9b870 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 kernel/rcu/tasks.h:510 1 lock held by khungtaskd/27: #0: ffffffff87c9c6c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x340 kernel/locking/lockdep.c:6495 2 locks held by getty/2412: #0: ffff88810e084098 (&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 3 locks held by kworker/1:3/5211: #0: ffff88810903ad38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff88810903ad38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff88810903ad38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline] #0: ffff88810903ad38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:639 [inline] #0: ffff88810903ad38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:666 [inline] #0: ffff88810903ad38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x87a/0x15c0 kernel/workqueue.c:2361 #1: ffffc90001747da8 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x8ae/0x15c0 kernel/workqueue.c:2365 #2: ffff88810ed7a190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:832 [inline] #2: ffff88810ed7a190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c0/0x4ed0 drivers/usb/core/hub.c:5739 6 locks held by kworker/1:8/7382: #0: ffff88810903ad38 ((wq_completion)usb_hub_wq ){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] ){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] ){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline] ){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:639 [inline] ){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:666 [inline] ){+.+.}-{0:0}, at: process_one_work+0x87a/0x15c0 kernel/workqueue.c:2361 #1: ffffc9000ec87da8 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x8ae/0x15c0 kernel/workqueue.c:2365 #2: ffff88810ecb4190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:832 [inline] #2: ffff88810ecb4190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c0/0x4ed0 drivers/usb/core/hub.c:5739 #3: ffff8881194fd190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:832 [inline] #3: ffff8881194fd190 (&dev->mutex){....}-{3:3}, at: usb_disconnect+0xff/0x8a0 drivers/usb/core/hub.c:2229 #4: ffff88811c622118 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:832 [inline] #4: ffff88811c622118 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1063 [inline] #4: ffff88811c622118 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xa4/0x610 drivers/base/dd.c:1260 #5: ffffffff88683fb0 (minor_rwsem){++++}-{3:3} , at: usb_deregister_dev+0xa9/0x320 drivers/usb/core/file.c:239 6 locks held by kworker/1:0/16623: #0: ffff88810903ad38 ((wq_completion)usb_hub_wq ){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] ){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] ){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline] ){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:639 [inline] ){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:666 [inline] ){+.+.}-{0:0}, at: process_one_work+0x87a/0x15c0 kernel/workqueue.c:2361 #1: ffffc90004217da8 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x8ae/0x15c0 kernel/workqueue.c:2365 #2: ffff88810ec20190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:832 [inline] #2: ffff88810ec20190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c0/0x4ed0 drivers/usb/core/hub.c:5739 #3: ffff8881167b6190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:832 [inline] #3: ffff8881167b6190 (&dev->mutex){....}-{3:3}, at: __device_attach+0x76/0x4b0 drivers/base/dd.c:973 #4: ffff8881167b0118 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:832 [inline] #4: ffff8881167b0118 (&dev->mutex){....}-{3:3}, at: __device_attach+0x76/0x4b0 drivers/base/dd.c:973 #5: ffffffff88683fb0 (minor_rwsem){++++}-{3:3}, at: usb_register_dev drivers/usb/core/file.c:187 [inline] #5: ffffffff88683fb0 (minor_rwsem){++++}-{3:3}, at: usb_register_dev+0x19c/0x830 drivers/usb/core/file.c:156 3 locks held by kworker/0:6/19471: 5 locks held by kworker/0:7/22928: 2 locks held by syz-executor.3/2957: #0: ffffffff88683fb0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x28/0x2e0 drivers/usb/core/file.c:39 #1: ffff88810dc780d0 (&(sisusb->lock)){+.+.}-{3:3}, at: sisusb_open+0xb6/0x4e0 drivers/usb/misc/sisusbvga/sisusbvga.c:2213 2 locks held by syz-executor.1/2963: #0: ffffffff88683fb0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x28/0x2e0 drivers/usb/core/file.c:39 #1: ffff88810dc780d0 (&(sisusb->lock)){+.+.}-{3:3}, at: sisusb_open+0xb6/0x4e0 drivers/usb/misc/sisusbvga/sisusbvga.c:2213 4 locks held by udevd/2965: #0: ffff88811fb99790 (&p->lock){+.+.}-{3:3}, at: seq_read_iter+0xe3/0x12d0 fs/seq_file.c:182 #1: ffff8881195d6c88 (&of->mutex){+.+.}-{3:3}, at: kernfs_seq_start+0x4b/0x450 fs/kernfs/file.c:154 #2: ffff88810d8dcae8 (kn->active#27){++++}-{0:0}, at: kernfs_seq_start+0x75/0x450 fs/kernfs/file.c:155 #3: ffff8881194fd190 (&dev->mutex){....}-{3:3}, at: device_lock_interruptible include/linux/device.h:837 [inline] #3: ffff8881194fd190 (&dev->mutex){....}-{3:3}, at: manufacturer_show+0x26/0xa0 drivers/usb/core/sysfs.c:142 4 locks held by udevd/2966: #0: ffff88810d461c30 (&p->lock){+.+.}-{3:3}, at: seq_read_iter+0xe3/0x12d0 fs/seq_file.c:182 #1: ffff888137134c88 (&of->mutex){+.+.}-{3:3}, at: kernfs_seq_start+0x4b/0x450 fs/kernfs/file.c:154 #2: ffff888110cc92c0 (kn->active#27){++++}-{0:0}, at: kernfs_seq_start+0x75/0x450 fs/kernfs/file.c:155 #3: ffff8881167b6190 (&dev->mutex){....}-{3:3}, at: device_lock_interruptible include/linux/device.h:837 [inline] #3: ffff8881167b6190 (&dev->mutex){....}-{3:3}, at: manufacturer_show+0x26/0xa0 drivers/usb/core/sysfs.c:142 1 lock held by syz-executor.1/3924: #0: ffffffff88683fb0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x28/0x2e0 drivers/usb/core/file.c:39 1 lock held by syz-executor.1/3925: #0: ffffffff88683fb0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x28/0x2e0 drivers/usb/core/file.c:39 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 27 Comm: khungtaskd Not tainted 6.3.0-rc6-syzkaller-gced7c981f382 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 nmi_cpu_backtrace+0x29c/0x350 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x273/0x2d0 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+0xe16/0x1090 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