usb 4-1: New USB device found, idVendor=0547, idProduct=2235, bcdDevice= 0.00
usb 4-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 4-1: Product: syz
usb 4-1: Manufacturer: syz
usb 4-1: SerialNumber: syz
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 1 UID: 0 PID: 5599 Comm: kworker/1:4 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Workqueue: usb_hub_wq hub_event
RIP: 0010:usbtest_probe+0x522/0xcc0 drivers/usb/misc/usbtest.c:2822
Code: 9a fa 45 85 ff 78 0a e8 ac 85 9a fa e9 92 00 00 00 48 8b 04 24 4c 8d 78 0a 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 bf 06 00 00 45 0f b6 3f 44 89 fe 83 e6 01
RSP: 0018:ffffc90005736de0 EFLAGS: 00010202
RAX: 0000000000000001 RBX: ffff88803b387000 RCX: dffffc0000000000
RDX: 0000000000000002 RSI: 00000000ffffffff RDI: 00000000ffffffff
RBP: 1ffff1100ba1f059 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000021 R11: ffffffff8e3c3880 R12: ffff88805d0f8200
R13: 1ffff1100ba1f040 R14: ffff88805d0f82c8 R15: 000000000000000a
FS:  0000000000000000(0000) GS:ffff888125af2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32222ff8 CR3: 0000000036164000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 usb_probe_interface+0x788/0xe50 drivers/usb/core/driver.c:399
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x254/0xae0 drivers/base/dd.c:706
 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
 driver_probe_device+0x4f/0x240 drivers/base/dd.c:898
 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1026
 bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500
 __device_attach+0x2c7/0x450 drivers/base/dd.c:1098
 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153
 bus_probe_device+0x12d/0x220 drivers/base/bus.c:620
 device_add+0x7d7/0xb80 drivers/base/core.c:3772
 usb_set_configuration+0x1ad8/0x2180 drivers/usb/core/message.c:2268
 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250
 usb_probe_device+0x1c3/0x3b0 drivers/usb/core/driver.c:293
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x254/0xae0 drivers/base/dd.c:706
 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
 driver_probe_device+0x4f/0x240 drivers/base/dd.c:898
 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1026
 bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500
 __device_attach+0x2c7/0x450 drivers/base/dd.c:1098
 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153
 bus_probe_device+0x12d/0x220 drivers/base/bus.c:620
 device_add+0x7d7/0xb80 drivers/base/core.c:3772
 usb_new_device+0x98d/0x1610 drivers/usb/core/hub.c:2695
 hub_port_connect drivers/usb/core/hub.c:5567 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
 port_event drivers/usb/core/hub.c:5871 [inline]
 hub_event+0x28cf/0x4cf0 drivers/usb/core/hub.c:5953
 process_one_work+0xaaf/0x1480 kernel/workqueue.c:3379
 process_scheduled_works kernel/workqueue.c:3462 [inline]
 worker_thread+0xb05/0x10d0 kernel/workqueue.c:3543
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:usbtest_probe+0x522/0xcc0 drivers/usb/misc/usbtest.c:2822
Code: 9a fa 45 85 ff 78 0a e8 ac 85 9a fa e9 92 00 00 00 48 8b 04 24 4c 8d 78 0a 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 bf 06 00 00 45 0f b6 3f 44 89 fe 83 e6 01
RSP: 0018:ffffc90005736de0 EFLAGS: 00010202
RAX: 0000000000000001 RBX: ffff88803b387000 RCX: dffffc0000000000
RDX: 0000000000000002 RSI: 00000000ffffffff RDI: 00000000ffffffff
RBP: 1ffff1100ba1f059 R08: 0000000000000000 R09: 0000000000000000
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	fa                   	cli
   1:	45 85 ff             	test   %r15d,%r15d
   4:	78 0a                	js     0x10
   6:	e8 ac 85 9a fa       	call   0xfa9a85b7
   b:	e9 92 00 00 00       	jmp    0xa2
  10:	48 8b 04 24          	mov    (%rsp),%rax
  14:	4c 8d 78 0a          	lea    0xa(%rax),%r15
  18:	4c 89 f8             	mov    %r15,%rax
  1b:	48 c1 e8 03          	shr    $0x3,%rax
  1f:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  26:	fc ff df
* 29:	0f b6 04 08          	movzbl (%rax,%rcx,1),%eax <-- trapping instruction
  2d:	84 c0                	test   %al,%al
  2f:	0f 85 bf 06 00 00    	jne    0x6f4
  35:	45 0f b6 3f          	movzbl (%r15),%r15d
  39:	44 89 fe             	mov    %r15d,%esi
  3c:	83 e6 01             	and    $0x1,%esi