usb 4-1: new low-speed USB device number 4 using dummy_hcd
usb 4-1: device descriptor read/64, error -110
Oops: general protection fault, probably [  180.877658][ T5825] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]
CPU: 0 UID: 0 PID: 5825 Comm: kworker/0:4 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Workqueue: usb_hub_wq hub_event
RIP: 0010:usb_gadget_udc_reset+0x29/0xb0 drivers/usb/gadget/udc/core.c:1191
Code: 90 f3 0f 1e fa 41 57 41 56 53 49 89 f6 48 89 fb 49 bf 00 00 00 00 00 fc ff df e8 02 0c 03 fb 49 83 c6 40 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 d8 e7 63 fb 4d 8b 1e 48 89 df 2e
RSP: 0018:ffffc90004d6f278 EFLAGS: 00010202
RAX: 0000000000000008 RBX: ffff888145f14c40 RCX: 0000000000100000
RDX: ffffc9001aa0b000 RSI: 000000000000121d RDI: 000000000000121e
RBP: ffff888030298b64 R08: ffffffff8eb5bf37 R09: 1ffffffff1d6b7e6
R10: dffffc0000000000 R11: fffffbfff1d6b7e7 R12: ffff888145f14c40
R13: 1ffff11028bf5ca1 R14: 0000000000000040 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888127022000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005581dbb165d0 CR3: 000000003caca000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 set_link_state+0x80b/0x1220 drivers/usb/gadget/udc/dummy_hcd.c:469
 dummy_hub_control+0xcc0/0x1760 drivers/usb/gadget/udc/dummy_hcd.c:2327
 rh_call_control drivers/usb/core/hcd.c:656 [inline]
 rh_urb_enqueue drivers/usb/core/hcd.c:821 [inline]
 usb_hcd_submit_urb+0xde6/0x1a80 drivers/usb/core/hcd.c:1542
 usb_start_wait_urb+0x114/0x4c0 drivers/usb/core/message.c:59
 usb_internal_control_msg drivers/usb/core/message.c:103 [inline]
 usb_control_msg+0x232/0x3e0 drivers/usb/core/message.c:154
 set_port_feature drivers/usb/core/hub.c:470 [inline]
 hub_port_reset+0x390/0x1740 drivers/usb/core/hub.c:3082
 hub_port_init+0x2b0/0x2800 drivers/usb/core/hub.c:4938
 hub_port_connect drivers/usb/core/hub.c:5495 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5706 [inline]
 port_event drivers/usb/core/hub.c:5870 [inline]
 hub_event+0x2532/0x4a20 drivers/usb/core/hub.c:5952
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x439/0x7d0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:usb_gadget_udc_reset+0x29/0xb0 drivers/usb/gadget/udc/core.c:1191
Code: 90 f3 0f 1e fa 41 57 41 56 53 49 89 f6 48 89 fb 49 bf 00 00 00 00 00 fc ff df e8 02 0c 03 fb 49 83 c6 40 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 d8 e7 63 fb 4d 8b 1e 48 89 df 2e
RSP: 0018:ffffc90004d6f278 EFLAGS: 00010202
RAX: 0000000000000008 RBX: ffff888145f14c40 RCX: 0000000000100000
RDX: ffffc9001aa0b000 RSI: 000000000000121d RDI: 000000000000121e
RBP: ffff888030298b64 R08: ffffffff8eb5bf37 R09: 1ffffffff1d6b7e6
R10: dffffc0000000000 R11: fffffbfff1d6b7e7 R12: ffff888145f14c40
R13: 1ffff11028bf5ca1 R14: 0000000000000040 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888127022000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2fd24224 CR3: 000000002565c000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	90                   	nop
   1:	f3 0f 1e fa          	endbr64
   5:	41 57                	push   %r15
   7:	41 56                	push   %r14
   9:	53                   	push   %rbx
   a:	49 89 f6             	mov    %rsi,%r14
   d:	48 89 fb             	mov    %rdi,%rbx
  10:	49 bf 00 00 00 00 00 	movabs $0xdffffc0000000000,%r15
  17:	fc ff df
  1a:	e8 02 0c 03 fb       	call   0xfb030c21
  1f:	49 83 c6 40          	add    $0x40,%r14
  23:	4c 89 f0             	mov    %r14,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 f7             	mov    %r14,%rdi
  34:	e8 d8 e7 63 fb       	call   0xfb63e811
  39:	4d 8b 1e             	mov    (%r14),%r11
  3c:	48 89 df             	mov    %rbx,%rdi
  3f:	2e                   	cs