R13: 000000000000000b R14: 00007f9e62574f80 R15: 00007ffff161f638
usb usb4: device_add((null)) --> -22
general protection fault, probably for non-canonical address 0xdffffc000000001a: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x00000000000000d0-0x00000000000000d7]
CPU: 1 PID: 367 Comm: syz-executor.2 Not tainted 5.10.237-syzkaller-1007474-gcf6ed0f1511d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:__device_attach+0xae/0x400 drivers/base/dd.c:908
Code: 8d 66 68 4c 89 e0 48 c1 e8 03 80 3c 18 00 74 08 4c 89 e7 e8 44 62 f2 fe 4d 8b 2c 24 4d 8d a5 d0 00 00 00 4c 89 e0 48 c1 e8 03 <0f> b6 04 18 84 c0 0f 85 17 03 00 00 41 0f b6 1c 24 89 de 83 e6 01
RSP: 0018:ffffc900011a7be0 EFLAGS: 00010202
RAX: 000000000000001a RBX: dffffc0000000000 RCX: ffffffff8473c6ac
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffc900011a7b60
RBP: ffffc900011a7c98 R08: dffffc0000000000 R09: fffff52000234f6d
R10: fffff52000234f6d R11: 1ffff92000234f6c R12: 00000000000000d0
R13: 0000000000000000 R14: ffff888110e77830 R15: 0000000000000000
FS:  00007f9e61fd86c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f12f0676988 CR3: 0000000110b4d000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 device_attach+0x17/0x20 drivers/base/dd.c:975
 proc_ioctl+0x3f6/0x5e0 drivers/usb/core/devio.c:2272
 proc_ioctl_default+0xb9/0xf0 drivers/usb/core/devio.c:2307
 usbdev_do_ioctl drivers/usb/core/devio.c:2663 [inline]
 usbdev_ioctl+0x158a/0x1e40 drivers/usb/core/devio.c:2723
 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: 0033:0x7f9e62455959
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9e61fd80c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f9e62574f80 RCX: 00007f9e62455959
RDX: 0000000020000080 RSI: 00000000c0105512 RDI: 0000000000000006
RBP: 00007f9e624b1c88 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f9e62574f80 R15: 00007ffff161f638
Modules linked in:

---[ end trace b1997a4b40e3299f ]---
RIP: 0010:__device_attach+0xae/0x400 drivers/base/dd.c:908
Code: 8d 66 68 4c 89 e0 48 c1 e8 03 80 3c 18 00 74 08 4c 89 e7 e8 44 62 f2 fe 4d 8b 2c 24 4d 8d a5 d0 00 00 00 4c 89 e0 48 c1 e8 03 <0f> b6 04 18 84 c0 0f 85 17 03 00 00 41 0f b6 1c 24 89 de 83 e6 01
RSP: 0018:ffffc900011a7be0 EFLAGS: 00010202
RAX: 000000000000001a RBX: dffffc0000000000 RCX: ffffffff8473c6ac
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffc900011a7b60
RBP: ffffc900011a7c98 R08: dffffc0000000000 R09: fffff52000234f6d
R10: fffff52000234f6d R11: 1ffff92000234f6c R12: 00000000000000d0
R13: 0000000000000000 R14: ffff888110e77830 R15: 0000000000000000
FS:  00007f9e61fd86c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f014f611c98 CR3: 0000000110b4d000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	8d 66 68             	lea    0x68(%rsi),%esp
   3:	4c 89 e0             	mov    %r12,%rax
   6:	48 c1 e8 03          	shr    $0x3,%rax
   a:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1)
   e:	74 08                	je     0x18
  10:	4c 89 e7             	mov    %r12,%rdi
  13:	e8 44 62 f2 fe       	call   0xfef2625c
  18:	4d 8b 2c 24          	mov    (%r12),%r13
  1c:	4d 8d a5 d0 00 00 00 	lea    0xd0(%r13),%r12
  23:	4c 89 e0             	mov    %r12,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	0f b6 04 18          	movzbl (%rax,%rbx,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	0f 85 17 03 00 00    	jne    0x34d
  36:	41 0f b6 1c 24       	movzbl (%r12),%ebx
  3b:	89 de                	mov    %ebx,%esi
  3d:	83 e6 01             	and    $0x1,%esi