general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 6692 Comm: syz.0.2561 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:dummy_udc_start+0xbb/0x210 drivers/usb/gadget/udc/dummy_hcd.c:989
Code: 00 00 ff 24 c5 00 2d 58 85 e8 91 eb 57 fe eb 13 e8 8a eb 57 fe eb 0c e8 83 eb 57 fe eb 05 e8 7c eb 57 fe 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 86 60 92 fe 4d 8b 36 4c 89 f7 e8
RSP: 0018:ffffc90000d07ae8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88810cef0010 RCX: 0000000000080000
RDX: ffffc90001129000 RSI: 0000000000000432 RDI: 0000000000000433
RBP: ffffc90000d07b10 R08: ffff88811595cf00 R09: 0000000000000004
R10: 0000000000000005 R11: 0000000000000002 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000003
FS:  00007f636145c6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f636145afd0 CR3: 0000000124484000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 usb_gadget_udc_start_locked drivers/usb/gadget/udc/core.c:1169 [inline]
 udc_bind_to_driver+0x333/0x6d0 drivers/usb/gadget/udc/core.c:1577
 usb_gadget_probe_driver+0x1fc/0x380 drivers/usb/gadget/udc/core.c:1639
 raw_ioctl_run drivers/usb/gadget/legacy/raw_gadget.c:548 [inline]
 raw_ioctl+0x114d/0x3040 drivers/usb/gadget/legacy/raw_gadget.c:1255
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl+0x121/0x1a0 fs/ioctl.c:739
 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:739
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f6362a02b2b
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:00007f6361459f00 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f6362a02b2b
RDX: 0000000000000000 RSI: 0000000000005501 RDI: 0000000000000003
RBP: 00007f636145afd0 R08: 0000000000000001 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000200000000340 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace 0961187c74038b8c ]---
RIP: 0010:dummy_udc_start+0xbb/0x210 drivers/usb/gadget/udc/dummy_hcd.c:989
Code: 00 00 ff 24 c5 00 2d 58 85 e8 91 eb 57 fe eb 13 e8 8a eb 57 fe eb 0c e8 83 eb 57 fe eb 05 e8 7c eb 57 fe 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 86 60 92 fe 4d 8b 36 4c 89 f7 e8
RSP: 0018:ffffc90000d07ae8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88810cef0010 RCX: 0000000000080000
RDX: ffffc90001129000 RSI: 0000000000000432 RDI: 0000000000000433
RBP: ffffc90000d07b10 R08: ffff88811595cf00 R09: 0000000000000004
R10: 0000000000000005 R11: 0000000000000002 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000003
FS:  00007f636145c6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f636145afd0 CR3: 0000000124484000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	ff 24 c5 00 2d 58 85 	jmp    *-0x7aa7d300(,%rax,8)
   9:	e8 91 eb 57 fe       	call   0xfe57eb9f
   e:	eb 13                	jmp    0x23
  10:	e8 8a eb 57 fe       	call   0xfe57eb9f
  15:	eb 0c                	jmp    0x23
  17:	e8 83 eb 57 fe       	call   0xfe57eb9f
  1c:	eb 05                	jmp    0x23
  1e:	e8 7c eb 57 fe       	call   0xfe57eb9f
  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 86 60 92 fe       	call   0xfe9260bf
  39:	4d 8b 36             	mov    (%r14),%r14
  3c:	4c 89 f7             	mov    %r14,%rdi
  3f:	e8                   	.byte 0xe8