ax88179_178a 1-1:0.0 (unnamed net_device) (uninitialized): Failed to read reg index 0x0000: -71
ax88179_178a 1-1:0.0 eth1: register 'ax88179_178a' at usb-dummy_hcd.0-1, ASIX AX88179 USB 3.0 Gigabit Ethernet, 1e:79:e9:ec:a1:23
usb 1-1: USB disconnect, device number 2
general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
CPU: 0 PID: 20 Comm: kworker/0:1 Not tainted 5.15.146-syzkaller-00264-gc541149e0f52 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Workqueue: usb_hub_wq hub_event
RIP: 0010:ax88179_disconnect+0x6d/0xb0 drivers/net/usb/ax88179_178a.c:531
Code: 54 fe 48 83 c3 20 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 11 b0 96 fe 48 8b 1b 48 83 c3 10 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 75 19 c6 03 01 4c 89 f7 e8 4f a2 04 00 eb 05
RSP: 0018:ffffc90000147628 EFLAGS: 00010202
RAX: 0000000000000002 RBX: 0000000000000010 RCX: ffff888100332780
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888119c4d000
RBP: ffffc90000147640 R08: ffffffff8326e3d2 R09: fffff52000028eb5
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888119c4d024
R13: ffff888119c4d030 R14: ffff888119c4d000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fefa47332c0 CR3: 000000010c3ef000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 usb_unbind_interface+0x1fa/0x8c0 drivers/usb/core/driver.c:458
 __device_release_driver drivers/base/dd.c:1229 [inline]
 device_release_driver_internal+0x50b/0x7d0 drivers/base/dd.c:1262
 device_release_driver+0x19/0x20 drivers/base/dd.c:1285
 bus_remove_device+0x2f8/0x360 drivers/base/bus.c:529
 device_del+0x663/0xe90 drivers/base/core.c:3592
 usb_disable_device+0x380/0x720 drivers/usb/core/message.c:1414
 usb_disconnect+0x32a/0x890 drivers/usb/core/hub.c:2240
 hub_port_connect drivers/usb/core/hub.c:5334 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5635 [inline]
 port_event drivers/usb/core/hub.c:5785 [inline]
 hub_event+0x1d42/0x4770 drivers/usb/core/hub.c:5867
 process_one_work+0x6bb/0xc10 kernel/workqueue.c:2317
 process_scheduled_works kernel/workqueue.c:2380 [inline]
 worker_thread+0xe02/0x12a0 kernel/workqueue.c:2466
 kthread+0x421/0x510 kernel/kthread.c:337
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
 </TASK>
Modules linked in:
---[ end trace b7fac83d77f8026d ]---
RIP: 0010:ax88179_disconnect+0x6d/0xb0 drivers/net/usb/ax88179_178a.c:531
Code: 54 fe 48 83 c3 20 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 11 b0 96 fe 48 8b 1b 48 83 c3 10 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 75 19 c6 03 01 4c 89 f7 e8 4f a2 04 00 eb 05
RSP: 0018:ffffc90000147628 EFLAGS: 00010202
RAX: 0000000000000002 RBX: 0000000000000010 RCX: ffff888100332780
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888119c4d000
RBP: ffffc90000147640 R08: ffffffff8326e3d2 R09: fffff52000028eb5
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888119c4d024
R13: ffff888119c4d030 R14: ffff888119c4d000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000564b3ff36088 CR3: 000000010c3ef000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	54                   	push   %rsp
   1:	fe 48 83             	decb   -0x7d(%rax)
   4:	c3                   	ret
   5:	20 48 89             	and    %cl,-0x77(%rax)
   8:	d8 48 c1             	fmuls  -0x3f(%rax)
   b:	e8 03 42 80 3c       	call   0x3c804213
  10:	38 00                	cmp    %al,(%rax)
  12:	74 08                	je     0x1c
  14:	48 89 df             	mov    %rbx,%rdi
  17:	e8 11 b0 96 fe       	call   0xfe96b02d
  1c:	48 8b 1b             	mov    (%rbx),%rbx
  1f:	48 83 c3 10          	add    $0x10,%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 38       	movzbl (%rax,%r15,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	75 19                	jne    0x4c
  33:	c6 03 01             	movb   $0x1,(%rbx)
  36:	4c 89 f7             	mov    %r14,%rdi
  39:	e8 4f a2 04 00       	call   0x4a28d
  3e:	eb 05                	jmp    0x45