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, MCT USB 3.0 Gigabit Ethernet Adapter, ee:f9:1c:f0:88:17
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: 1 PID: 3507 Comm: kworker/1:3 Not tainted 5.15.146-syzkaller #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+0x69/0xa0 drivers/net/usb/ax88179_178a.c:531
Code: 83 fb 48 83 c3 20 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 b5 fd cc fb 48 8b 1b 48 83 c3 10 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 75 1b c6 03 01 4c 89 f7 5b 41 5e 41 5f e9 4e
RSP: 0018:ffffc90002cf7590 EFLAGS: 00010202
RAX: 0000000000000002 RBX: 0000000000000010 RCX: ffff88807e488000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888018e02000
RBP: ffff8880157c20a8 R08: ffffffff861aaa1e R09: fffff5200059eea1
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffffff8d33d150
R13: 0000000000000000 R14: ffff888018e02000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b0f5fc9f78 CR3: 000000001d50b000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 usb_unbind_interface+0x1cd/0x840 drivers/usb/core/driver.c:458
 __device_release_driver drivers/base/dd.c:1229 [inline]
 device_release_driver_internal+0x50e/0x7f0 drivers/base/dd.c:1262
 bus_remove_device+0x2e5/0x400 drivers/base/bus.c:529
 device_del+0x6e2/0xbd0 drivers/base/core.c:3582
 usb_disable_device+0x3b8/0x840 drivers/usb/core/message.c:1414
 usb_disconnect+0x33c/0x8c0 drivers/usb/core/hub.c:2239
 hub_port_connect drivers/usb/core/hub.c:5281 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5577 [inline]
 port_event drivers/usb/core/hub.c:5723 [inline]
 hub_event+0x1d58/0x54c0 drivers/usb/core/hub.c:5805
 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310
 process_scheduled_works kernel/workqueue.c:2373 [inline]
 worker_thread+0xdcf/0x1280 kernel/workqueue.c:2459
 kthread+0x3f6/0x4f0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
 </TASK>
Modules linked in:
---[ end trace 804e372a6d96a293 ]---
RIP: 0010:ax88179_disconnect+0x69/0xa0 drivers/net/usb/ax88179_178a.c:531
Code: 83 fb 48 83 c3 20 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 b5 fd cc fb 48 8b 1b 48 83 c3 10 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 75 1b c6 03 01 4c 89 f7 5b 41 5e 41 5f e9 4e
RSP: 0018:ffffc90002cf7590 EFLAGS: 00010202

RAX: 0000000000000002 RBX: 0000000000000010 RCX: ffff88807e488000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888018e02000
RBP: ffff8880157c20a8 R08: ffffffff861aaa1e R09: fffff5200059eea1
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffffff8d33d150
R13: 0000000000000000 R14: ffff888018e02000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc550cfff8 CR3: 000000002364d000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	83 fb 48             	cmp    $0x48,%ebx
   3:	83 c3 20             	add    $0x20,%ebx
   6:	48 89 d8             	mov    %rbx,%rax
   9:	48 c1 e8 03          	shr    $0x3,%rax
   d:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1)
  12:	74 08                	je     0x1c
  14:	48 89 df             	mov    %rbx,%rdi
  17:	e8 b5 fd cc fb       	call   0xfbccfdd1
  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 1b                	jne    0x4e
  33:	c6 03 01             	movb   $0x1,(%rbx)
  36:	4c 89 f7             	mov    %r14,%rdi
  39:	5b                   	pop    %rbx
  3a:	41 5e                	pop    %r14
  3c:	41 5f                	pop    %r15
  3e:	e9                   	.byte 0xe9
  3f:	4e                   	rex.WRX