usb 3-1: SerialNumber: syz
usb 3-1: 1:1 : UAC_AS_GENERAL descriptor not found
usb 3-1: selecting invalid altsetting 0
usb 3-1: USB disconnect, device number 2
general protection fault, probably for non-canonical address 0xdffffc0000000004: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027]
CPU: 0 PID: 123 Comm: kworker/0:2 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: usb_hub_wq hub_event
RIP: 0010:klist_put lib/klist.c:212 [inline]
RIP: 0010:klist_del lib/klist.c:230 [inline]
RIP: 0010:klist_remove+0x150/0x2f0 lib/klist.c:249
Code: 2e 02 49 89 df 49 c1 ef 03 43 80 3c 27 00 74 08 48 89 df e8 82 70 42 ff 4c 8b 33 49 83 e6 fe 49 8d 7e 20 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 05 e8 64 70 42 ff 49 8b 46 20 48 89 44 24 18 4c
RSP: 0018:ffffc90000b776a0 EFLAGS: 00010202
RAX: 0000000000000004 RBX: ffff88812a731c48 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff86788280 RDI: 0000000000000020
RBP: ffffc90000b77798 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200016eec4 R12: dffffc0000000000
R13: 1ffff9200016eed8 R14: 0000000000000000 R15: 1ffff110254e6389
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f763fff CR3: 000000011d65b000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __device_release_driver drivers/base/dd.c:1264 [inline]
 device_release_driver_internal+0x659/0x790 drivers/base/dd.c:1282
 device_release_driver+0x19/0x20 drivers/base/dd.c:1305
 bus_remove_device+0x2c8/0x330 drivers/base/bus.c:531
 device_del+0x653/0xe50 drivers/base/core.c:3615
 usb_disable_device+0x3a8/0x750 drivers/usb/core/message.c:1472
 usb_disconnect+0x32d/0x870 drivers/usb/core/hub.c:2287
 hub_port_connect drivers/usb/core/hub.c:5341 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5637 [inline]
 port_event drivers/usb/core/hub.c:5799 [inline]
 hub_event+0x1b26/0x4a90 drivers/usb/core/hub.c:5881
 process_one_work+0x6c8/0xbb0 kernel/workqueue.c:2310
 process_scheduled_works kernel/workqueue.c:2373 [inline]
 worker_thread+0xd49/0x1250 kernel/workqueue.c:2459
 kthread+0x3f5/0x4f0 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
Modules linked in:
---[ end trace 75645e0b0d8a3ea2 ]---
RIP: 0010:klist_put lib/klist.c:212 [inline]
RIP: 0010:klist_del lib/klist.c:230 [inline]
RIP: 0010:klist_remove+0x150/0x2f0 lib/klist.c:249
Code: 2e 02 49 89 df 49 c1 ef 03 43 80 3c 27 00 74 08 48 89 df e8 82 70 42 ff 4c 8b 33 49 83 e6 fe 49 8d 7e 20 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 05 e8 64 70 42 ff 49 8b 46 20 48 89 44 24 18 4c
RSP: 0018:ffffc90000b776a0 EFLAGS: 00010202
RAX: 0000000000000004 RBX: ffff88812a731c48 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff86788280 RDI: 0000000000000020
RBP: ffffc90000b77798 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200016eec4 R12: dffffc0000000000
R13: 1ffff9200016eed8 R14: 0000000000000000 R15: 1ffff110254e6389
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000557f9c3d2c70 CR3: 000000010d0a8000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	2e 02 49 89          	cs add -0x77(%rcx),%cl
   4:	df 49 c1             	fisttps -0x3f(%rcx)
   7:	ef                   	out    %eax,(%dx)
   8:	03 43 80             	add    -0x80(%rbx),%eax
   b:	3c 27                	cmp    $0x27,%al
   d:	00 74 08 48          	add    %dh,0x48(%rax,%rcx,1)
  11:	89 df                	mov    %ebx,%edi
  13:	e8 82 70 42 ff       	call   0xff42709a
  18:	4c 8b 33             	mov    (%rbx),%r14
  1b:	49 83 e6 fe          	and    $0xfffffffffffffffe,%r14
  1f:	49 8d 7e 20          	lea    0x20(%r14),%rdi
  23:	48 89 f8             	mov    %rdi,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1) <-- trapping instruction
  2f:	74 05                	je     0x36
  31:	e8 64 70 42 ff       	call   0xff42709a
  36:	49 8b 46 20          	mov    0x20(%r14),%rax
  3a:	48 89 44 24 18       	mov    %rax,0x18(%rsp)
  3f:	4c                   	rex.WR