usbip-vudc usbip-vudc.0: failed to lookup sock ======================================================== WARNING: possible irq lock inversion dependency detected syzkaller #0 Not tainted -------------------------------------------------------- syz.8.3736/17974 just changed the state of lock: ffff888148cbc908 (&udc->lock){+.+.}-{2:2}, at: usbip_sockfd_store+0x131/0x8d0 drivers/usb/usbip/vudc_sysfs.c:116 but this lock was taken by another, SOFTIRQ-safe lock in the past: (&gi->spinlock){..-.}-{2:2} and interrupts could create inverse lock ordering between them. other info that might help us debug this: Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&udc->lock); local_irq_disable(); lock(&gi->spinlock); lock(&udc->lock); lock(&gi->spinlock); *** DEADLOCK *** 6 locks held by syz.8.3736/17974: #0: ffff888045842870 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2bf/0x370 fs/file.c:1056 #1: ffff8880676f0460 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x296/0xd70 fs/read_write.c:590 #2: ffff888060285088 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1dc/0x500 fs/kernfs/file.c:287 #3: ffff888148c7b3a8 (kn->active#1006){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1fd/0x500 fs/kernfs/file.c:288 #4: ffff888148cbc708 (&ud->sysfs_lock){+.+.}-{3:3}, at: usbip_sockfd_store+0x11f/0x8d0 drivers/usb/usbip/vudc_sysfs.c:115 #5: ffff888148cbc908 (&udc->lock){+.+.}-{2:2}, at: usbip_sockfd_store+0x131/0x8d0 drivers/usb/usbip/vudc_sysfs.c:116 the shortest dependencies between 2nd lock and 1st lock: -> (&gi->spinlock){..-.}-{2:2} { IN-SOFTIRQ-W at: lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:162 configfs_composite_setup+0x5d/0x100 drivers/usb/gadget/configfs.c:1485 dummy_timer+0x1338/0x34a0 drivers/usb/gadget/udc/dummy_hcd.c:1944 call_timer_fn+0x17b/0x540 kernel/time/timer.c:1648 expire_timers kernel/time/timer.c:1699 [inline] __run_timers+0x56c/0x810 kernel/time/timer.c:1970 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1983 handle_softirqs+0x336/0x830 kernel/softirq.c:576 run_ksoftirqd+0xa4/0x100 kernel/softirq.c:943 smpboot_thread_fn+0x520/0x990 kernel/smpboot.c:164 kthread+0x42e/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 INITIAL USE at: lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:162 configfs_composite_reset+0x53/0xf0 drivers/usb/gadget/configfs.c:1530 usb_gadget_udc_reset+0x3e/0x120 drivers/usb/gadget/udc/core.c:1123 set_link_state+0x8b4/0x1000 drivers/usb/gadget/udc/dummy_hcd.c:489 dummy_hub_control+0xaa1/0x1a90 drivers/usb/gadget/udc/dummy_hcd.c:-1 rh_call_control drivers/usb/core/hcd.c:681 [inline] rh_urb_enqueue drivers/usb/core/hcd.c:846 [inline] usb_hcd_submit_urb+0xe68/0x1970 drivers/usb/core/hcd.c:1553 usb_start_wait_urb+0x13c/0x580 drivers/usb/core/message.c:61 usb_internal_control_msg drivers/usb/core/message.c:116 [inline] usb_control_msg+0x231/0x3e0 drivers/usb/core/message.c:166 set_port_feature drivers/usb/core/hub.c:455 [inline] hub_port_reset+0x3ad/0x1870 drivers/usb/core/hub.c:3045 hub_port_init+0x25e/0x2850 drivers/usb/core/hub.c:4868 hub_port_connect drivers/usb/core/hub.c:5426 [inline] hub_port_connect_change drivers/usb/core/hub.c:5637 [inline] port_event drivers/usb/core/hub.c:5799 [inline] hub_event+0x276d/0x5260 drivers/usb/core/hub.c:5881 process_one_work+0x867/0xff0 kernel/workqueue.c:2310 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457 kthread+0x42e/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 } ... key at: [] gadgets_make.__key+0x0/0x20 ... acquired at: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:162 vep_queue+0x61/0x1c0 drivers/usb/usbip/vudc_dev.c:323 usb_ep_queue+0xe6/0x350 drivers/usb/gadget/udc/core.c:288 composite_ep0_queue drivers/usb/gadget/composite.c:1561 [inline] composite_setup+0x1d7a/0x2b60 drivers/usb/gadget/composite.c:2154 configfs_composite_setup+0xc3/0x100 drivers/usb/gadget/configfs.c:1492 get_gadget_descs+0x179/0x4f0 drivers/usb/usbip/vudc_sysfs.c:41 vgadget_pullup+0x15b/0x2f0 drivers/usb/usbip/vudc_dev.c:169 usb_gadget_connect+0x9c/0x2f0 drivers/usb/gadget/udc/core.c:718 usb_udc_connect_control drivers/usb/gadget/udc/core.c:1086 [inline] udc_bind_to_driver+0x4b5/0x5f0 drivers/usb/gadget/udc/core.c:1583 usb_gadget_probe_driver+0x1fb/0x380 drivers/usb/gadget/udc/core.c:1637 gadget_dev_desc_UDC_store+0x1ba/0x2e0 drivers/usb/gadget/configfs.c:289 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x30b/0x400 fs/configfs/file.c:229 call_write_iter include/linux/fs.h:2179 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x748/0xd70 fs/read_write.c:594 ksys_write+0x153/0x260 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> (&udc->lock){+.+.}-{2:2} { HARDIRQ-ON-W at: trace_hardirqs_on+0x67/0x80 kernel/trace/trace_preemptirq.c:49 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] _raw_spin_unlock_irq+0x1f/0x40 kernel/locking/spinlock.c:202 spin_unlock_irq include/linux/spinlock.h:414 [inline] usbip_sockfd_store+0x3cb/0x8d0 drivers/usb/usbip/vudc_sysfs.c:222 kernfs_fop_write_iter+0x3a8/0x500 fs/kernfs/file.c:296 call_write_iter include/linux/fs.h:2179 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x748/0xd70 fs/read_write.c:594 ksys_write+0x153/0x260 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 SOFTIRQ-ON-W at: trace_hardirqs_on+0x67/0x80 kernel/trace/trace_preemptirq.c:49 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] _raw_spin_unlock_irq+0x1f/0x40 kernel/locking/spinlock.c:202 spin_unlock_irq include/linux/spinlock.h:414 [inline] usbip_sockfd_store+0x3cb/0x8d0 drivers/usb/usbip/vudc_sysfs.c:222 kernfs_fop_write_iter+0x3a8/0x500 fs/kernfs/file.c:296 call_write_iter include/linux/fs.h:2179 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x748/0xd70 fs/read_write.c:594 ksys_write+0x153/0x260 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 INITIAL USE at: lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:162 vgadget_udc_start+0x2d/0xa0 drivers/usb/usbip/vudc_dev.c:199 usb_gadget_udc_start drivers/usb/gadget/udc/core.c:1150 [inline] udc_bind_to_driver+0x2b5/0x5f0 drivers/usb/gadget/udc/core.c:1577 usb_gadget_probe_driver+0x1fb/0x380 drivers/usb/gadget/udc/core.c:1637 gadget_dev_desc_UDC_store+0x1ba/0x2e0 drivers/usb/gadget/configfs.c:289 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x30b/0x400 fs/configfs/file.c:229 call_write_iter include/linux/fs.h:2179 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x748/0xd70 fs/read_write.c:594 ksys_write+0x153/0x260 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 } ... key at: [] init_vudc_hw.__key+0x0/0x20 ... acquired at: mark_lock+0x208/0x320 kernel/locking/lockdep.c:4591 mark_held_locks kernel/locking/lockdep.c:4193 [inline] __trace_hardirqs_on_caller kernel/locking/lockdep.c:4219 [inline] lockdep_hardirqs_on_prepare+0x380/0x7c0 kernel/locking/lockdep.c:4278 trace_hardirqs_on+0x67/0x80 kernel/trace/trace_preemptirq.c:49 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] _raw_spin_unlock_irq+0x1f/0x40 kernel/locking/spinlock.c:202 spin_unlock_irq include/linux/spinlock.h:414 [inline] usbip_sockfd_store+0x3cb/0x8d0 drivers/usb/usbip/vudc_sysfs.c:222 kernfs_fop_write_iter+0x3a8/0x500 fs/kernfs/file.c:296 call_write_iter include/linux/fs.h:2179 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x748/0xd70 fs/read_write.c:594 ksys_write+0x153/0x260 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 stack backtrace: CPU: 0 PID: 17974 Comm: syz.8.3736 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 check_usage_backwards kernel/locking/lockdep.c:-1 [inline] mark_lock_irq+0x675/0x900 kernel/locking/lockdep.c:4155 mark_lock+0x208/0x320 kernel/locking/lockdep.c:4591 mark_held_locks kernel/locking/lockdep.c:4193 [inline] __trace_hardirqs_on_caller kernel/locking/lockdep.c:4219 [inline] lockdep_hardirqs_on_prepare+0x380/0x7c0 kernel/locking/lockdep.c:4278 trace_hardirqs_on+0x67/0x80 kernel/trace/trace_preemptirq.c:49 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] _raw_spin_unlock_irq+0x1f/0x40 kernel/locking/spinlock.c:202 spin_unlock_irq include/linux/spinlock.h:414 [inline] usbip_sockfd_store+0x3cb/0x8d0 drivers/usb/usbip/vudc_sysfs.c:222 kernfs_fop_write_iter+0x3a8/0x500 fs/kernfs/file.c:296 call_write_iter include/linux/fs.h:2179 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x748/0xd70 fs/read_write.c:594 ksys_write+0x153/0x260 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f4df6a24159 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4df4c7c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f4df6cabfa0 RCX: 00007f4df6a24159 RDX: 0000000000000001 RSI: 0000200000000880 RDI: 0000000000000003 RBP: 00007f4df6abb024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4df6cac038 R14: 00007f4df6cabfa0 R15: 00007ffd8edecd48 ------------[ cut here ]------------ raw_local_irq_restore() called with IRQs enabled WARNING: CPU: 0 PID: 17974 at kernel/locking/irqflag-debug.c:10 warn_bogus_irq_restore+0x1d/0x20 kernel/locking/irqflag-debug.c:10 Modules linked in: CPU: 0 PID: 17974 Comm: syz.8.3736 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:warn_bogus_irq_restore+0x1d/0x20 kernel/locking/irqflag-debug.c:10 Code: 24 48 c7 c7 80 e9 29 8a e8 20 0a f5 ff 80 3d 73 00 b7 03 00 74 01 c3 c6 05 69 00 b7 03 01 48 c7 c7 60 23 2b 8a e8 83 15 f5 ff <0f> 0b c3 41 56 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 RSP: 0018:ffffc90004747ad8 EFLAGS: 00010246 RAX: 6aa7efd796f44400 RBX: 0000000000000a06 RCX: 0000000000080000 RDX: ffffc900145ad000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: ffffc90004747b70 R08: ffffc90004747607 R09: 1ffff920008e8ec0 R10: dffffc0000000000 R11: fffff520008e8ec1 R12: dffffc0000000000 R13: dffffc0000000000 R14: ffff888148cbc8f0 R15: 1ffff920008e8f5c FS: 00007f4df4c7c6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b32c22ff8 CR3: 0000000020485000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irqrestore+0xfe/0x120 kernel/locking/spinlock.c:194 spin_unlock_irqrestore include/linux/spinlock.h:419 [inline] usbip_sockfd_store+0x716/0x8d0 drivers/usb/usbip/vudc_sysfs.c:224 kernfs_fop_write_iter+0x3a8/0x500 fs/kernfs/file.c:296 call_write_iter include/linux/fs.h:2179 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x748/0xd70 fs/read_write.c:594 ksys_write+0x153/0x260 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f4df6a24159 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4df4c7c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f4df6cabfa0 RCX: 00007f4df6a24159 RDX: 0000000000000001 RSI: 0000200000000880 RDI: 0000000000000003 RBP: 00007f4df6abb024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4df6cac038 R14: 00007f4df6cabfa0 R15: 00007ffd8edecd48