dummy_hcd dummy_hcd.0: remove, state 4
usb usb1: USB disconnect, device number 1
dummy_hcd dummy_hcd.0: stopped
dummy_hcd dummy_hcd.0: USB bus 1 deregistered
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 UID: 0 PID: 5641 Comm: syz-executor339 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:dummy_udc_start+0xd0/0x1f0 drivers/usb/gadget/udc/dummy_hcd.c:1022
Code: 41 83 ff 03 74 18 41 83 ff 05 0f 85 93 00 00 00 e8 75 db 0f fa eb 0c e8 6e db 0f fa eb 05 e8 67 db 0f fa 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 c1 73 7d fa 4d 8b 36 4c 89 f7 e8
RSP: 0018:ffffc9000246f830 EFLAGS: 00010256
RAX: 0000000000000000 RBX: ffff888078ac8050 RCX: ffff88807fb99f00
RDX: 0000000000000000 RSI: ffffffff8f9fa540 RDI: 0000000000000003
RBP: ffff88802b03f000 R08: ffff88807fb99f00 R09: 0000000000000004
R10: 0000000000000005 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000003
FS:  000055555847c400(0000) GS:ffff88812504c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000062b5d8 CR3: 0000000074275000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 usb_gadget_udc_start_locked drivers/usb/gadget/udc/core.c:1237 [inline]
 gadget_bind_driver+0x3a8/0x9e0 drivers/usb/gadget/udc/core.c:1667
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x254/0xae0 drivers/base/dd.c:706
 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
 driver_probe_device+0x4f/0x240 drivers/base/dd.c:898
 __driver_attach+0x339/0x600 drivers/base/dd.c:1292
 bus_for_each_dev+0x23b/0x2c0 drivers/base/bus.c:383
 bus_add_driver+0x345/0x670 drivers/base/bus.c:763
 driver_register+0x23a/0x320 drivers/base/driver.c:174
 usb_gadget_register_driver_owner+0xf9/0x270 drivers/usb/gadget/udc/core.c:1752
 raw_ioctl_run drivers/usb/gadget/legacy/raw_gadget.c:596 [inline]
 raw_ioctl+0x1541/0x41c0 drivers/usb/gadget/legacy/raw_gadget.c:1307
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0e4cd90ddb
Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00
RSP: 002b:00007ffeebe402e0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f0e4cd90ddb
RDX: 0000000000000000 RSI: 0000000000005501 RDI: 0000000000000004
RBP: 00007ffeebe413b0 R08: 0000000000000001 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0e4ce2ab20 R14: 00007ffeebe40380 R15: 0000000000000002
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dummy_udc_start+0xd0/0x1f0 drivers/usb/gadget/udc/dummy_hcd.c:1022
Code: 41 83 ff 03 74 18 41 83 ff 05 0f 85 93 00 00 00 e8 75 db 0f fa eb 0c e8 6e db 0f fa eb 05 e8 67 db 0f fa 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 c1 73 7d fa 4d 8b 36 4c 89 f7 e8
RSP: 0018:ffffc9000246f830 EFLAGS: 00010256
RAX: 0000000000000000 RBX: ffff888078ac8050 RCX: ffff88807fb99f00
RDX: 0000000000000000 RSI: ffffffff8f9fa540 RDI: 0000000000000003
RBP: ffff88802b03f000 R08: ffff88807fb99f00 R09: 0000000000000004
R10: 0000000000000005 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000003
FS:  000055555847c400(0000) GS:ffff88812504c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000062b5d8 CR3: 0000000074275000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
   0:	41 83 ff 03          	cmp    $0x3,%r15d
   4:	74 18                	je     0x1e
   6:	41 83 ff 05          	cmp    $0x5,%r15d
   a:	0f 85 93 00 00 00    	jne    0xa3
  10:	e8 75 db 0f fa       	call   0xfa0fdb8a
  15:	eb 0c                	jmp    0x23
  17:	e8 6e db 0f fa       	call   0xfa0fdb8a
  1c:	eb 05                	jmp    0x23
  1e:	e8 67 db 0f fa       	call   0xfa0fdb8a
  23:	4c 89 f0             	mov    %r14,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 f7             	mov    %r14,%rdi
  34:	e8 c1 73 7d fa       	call   0xfa7d73fa
  39:	4d 8b 36             	mov    (%r14),%r14
  3c:	4c 89 f7             	mov    %r14,%rdi
  3f:	e8                   	.byte 0xe8