usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 1-1: Product: syz
usb 1-1: Manufacturer: syz
usb 1-1: SerialNumber: syz
Unable to handle kernel paging request at virtual address dfff800000000001
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
Mem abort info:
  ESR = 0x0000000096000005
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x05: level 1 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000
  CM = 0, WnR = 0, TnD = 0, TagAccess = 0
  GCS = 0, Overlay = 0, DirtyBit = 0
[dfff800000000001] address between user and kernel address ranges
Internal error: Oops: 0000000096000005 [#1]  SMP
Modules linked in:
CPU: 0 UID: 0 PID: 6827 Comm: kworker/0:12 Tainted: G             L      syzkaller #0 PREEMPT 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026
Workqueue: usb_hub_wq hub_event
pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : usbtest_probe+0x40c/0xa6c drivers/usb/misc/usbtest.c:2822
lr : usbtest_probe+0x3f8/0xa6c drivers/usb/misc/usbtest.c:2822
sp : ffff800092d26f20
x29: ffff800092d26f50 x28: ffff0000d85220b0 x27: dfff800000000000
x26: ffff80008730aba0 x25: 1fffe0001e41621a x24: ffff0000d8522000
x23: 1fffe0001e416200 x22: 000000000000000a x21: ffff0000f20b1000
x20: 0000000000000000 x19: ffff0000c730c000 x18: 000000000002a180
x17: 000000000004fffd x16: 000000000004fffe x15: ffff8000824e8a50
x14: ffff8000824f370c x13: 0000000000000001 x12: 0000000000000000
x11: ffff80008a590e28 x10: 0000000000000001 x9 : 0000000000000000
x8 : 0000000000000001 x7 : 0000000000000000 x6 : ffff80008311bf58
x5 : ffff0000c9f71308 x4 : 0000000000000008 x3 : ffff8000834e8364
x2 : 00000000ffffffff x1 : ffff0000d3e9ba80 x0 : 0000000000000000
Call trace:
 usbtest_probe+0x40c/0xa6c drivers/usb/misc/usbtest.c:2822 (P)
 usb_probe_interface+0x308/0x788 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x29c/0x800 drivers/base/dd.c:706
 __driver_probe_device+0x1e0/0x350 drivers/base/dd.c:868
 driver_probe_device+0x6c/0x19c drivers/base/dd.c:898
 __device_attach_driver+0x198/0x2f8 drivers/base/dd.c:1026
 bus_for_each_drv+0x144/0x1dc drivers/base/bus.c:500
 __device_attach+0x248/0x390 drivers/base/dd.c:1098
 device_initial_probe+0x90/0xc8 drivers/base/dd.c:1153
 bus_probe_device+0x58/0x120 drivers/base/bus.c:620
 device_add+0x6cc/0x9e0 drivers/base/core.c:3772
 usb_set_configuration+0x1184/0x158c drivers/usb/core/message.c:2268
 usb_generic_driver_probe+0x8c/0x148 drivers/usb/core/generic.c:250
 usb_probe_device+0x114/0x2b0 drivers/usb/core/driver.c:291
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x29c/0x800 drivers/base/dd.c:706
 __driver_probe_device+0x1e0/0x350 drivers/base/dd.c:868
 driver_probe_device+0x6c/0x19c drivers/base/dd.c:898
 __device_attach_driver+0x198/0x2f8 drivers/base/dd.c:1026
 bus_for_each_drv+0x144/0x1dc drivers/base/bus.c:500
 __device_attach+0x248/0x390 drivers/base/dd.c:1098
 device_initial_probe+0x90/0xc8 drivers/base/dd.c:1153
 bus_probe_device+0x58/0x120 drivers/base/bus.c:620
 device_add+0x6cc/0x9e0 drivers/base/core.c:3772
 usb_new_device+0x9bc/0x11f0 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+0x1ef0/0x39fc drivers/usb/core/hub.c:5953
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0x788/0x10b8 kernel/workqueue.c:3405
 worker_thread+0x798/0xbd0 kernel/workqueue.c:3486
 kthread+0x304/0x3d4 kernel/kthread.c:436
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:842
Code: 9745b896 14000016 91002a96 d343fec8 (38fb6908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	9745b896 	bl	0xfffffffffd16e258
   4:	14000016 	b	0x5c
   8:	91002a96 	add	x22, x20, #0xa
   c:	d343fec8 	lsr	x8, x22, #3
* 10:	38fb6908 	ldrsb	w8, [x8, x27] <-- trapping instruction