gadgetfs: bound to dummy_udc driver
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 UID: 0 PID: 10990 Comm: syz.4.486 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
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 15 9f 97 fa eb 0c e8 0e 9f 97 fa eb 05 e8 07 9f 97 fa 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 d1 11 01 fb 4d 8b 36 4c 89 f7 e8
RSP: 0018:ffffc90006e37850 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffff8efcfe40 RCX: 0000000000080000
RDX: ffffc90013cab000 RSI: 00000000000023fe RDI: 00000000000023ff
RBP: ffff88802aaab000 R08: ffff88805f3cbe00 R09: 0000000000000004
R10: 0000000000000100 R11: 0000000000000005 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000002
FS:  00007f42281466c0(0000) GS:ffff888125c3e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa1fe554ff8 CR3: 000000004088a000 CR4: 00000000003526f0
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+0x23e/0x2c0 drivers/base/bus.c:383
 bus_add_driver+0x348/0x670 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
 dev_config+0xe4e/0x12c0 drivers/usb/gadget/legacy/inode.c:1883
 vfs_write+0x29f/0xbb0 fs/read_write.c:685
 ksys_write+0x156/0x270 fs/read_write.c:739
 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: 0033:0x7f4229eee019
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:00007f4228146028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f422a175fa0 RCX: 00007f4229eee019
RDX: 000000000000001f RSI: 0000200000000400 RDI: 0000000000000003
RBP: 00007f4229f8500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f422a176038 R14: 00007f422a175fa0 R15: 00007fff02cbab18
 </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 15 9f 97 fa eb 0c e8 0e 9f 97 fa eb 05 e8 07 9f 97 fa 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 d1 11 01 fb 4d 8b 36 4c 89 f7 e8
RSP: 0018:ffffc90006e37850 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffff8efcfe40 RCX: 0000000000080000
RDX: ffffc90013cab000 RSI: 00000000000023fe RDI: 00000000000023ff
RBP: ffff88802aaab000 R08: ffff88805f3cbe00 R09: 0000000000000004
R10: 0000000000000100 R11: 0000000000000005 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000002
FS:  00007f42281466c0(0000) GS:ffff888125c3e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa1fe554ff8 CR3: 000000004088a000 CR4: 00000000003526f0
----------------
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 15 9f 97 fa       	call   0xfa979f2a
  15:	eb 0c                	jmp    0x23
  17:	e8 0e 9f 97 fa       	call   0xfa979f2a
  1c:	eb 05                	jmp    0x23
  1e:	e8 07 9f 97 fa       	call   0xfa979f2a
  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 d1 11 01 fb       	call   0xfb01120a
  39:	4d 8b 36             	mov    (%r14),%r14
  3c:	4c 89 f7             	mov    %r14,%rdi
  3f:	e8                   	.byte 0xe8