syzbot

Unable to handle kernel paging request at virtual address dfff800000000021
KASAN: null-ptr-deref in range [0x0000000000000108-0x000000000000010f]
Mem abort info:
  ESR = 0x0000000096000006
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x06: level 2 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000006
  CM = 0, WnR = 0
[dfff800000000021] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4316 Comm: syz-executor505 Not tainted 6.1.135-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : bcsp_recv+0x9c/0x1164 drivers/bluetooth/hci_bcsp.c:590
lr : bcsp_recv+0x70/0x1164 drivers/bluetooth/hci_bcsp.c:589
sp : ffff800020717b20
x29: ffff800020717b70 x28: 000000000000017c x27: 0000000000000178
x26: 000000000000002f x25: dfff800000000000 x24: 0000000000000110
x23: 0000000000000021 x22: 0000000000000108 x21: ffff0000cefa05b8
x20: ffff800020717c40 x19: 0000000000000001 x18: 0000000000000000
x17: 0000000000000000 x16: ffff8000082d0758 x15: 0000000000000000
x14: 0000000080045440 x13: 1ffff00002a0e0b1 x12: 0000000000ff0100
x11: ff0080000eaebb8c x10: 0000000000000000 x9 : ffff0000d9d1d340
x8 : 0000000000000182 x7 : ffff80000eae73cc x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff8000131ed2a0
x2 : 0000000000000001 x1 : 0000000000000001 x0 : 0000000000000000
Call trace:
 bcsp_recv+0x9c/0x1164 drivers/bluetooth/hci_bcsp.c:-1
 hci_uart_tty_receive+0x140/0x1d4 drivers/bluetooth/hci_ldisc.c:624
 tiocsti+0x234/0x2d8 drivers/tty/tty_io.c:2288
 tty_ioctl+0x35c/0xd8c drivers/tty/tty_io.c:2690
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
Code: d343ff7a f90017e8 a93e5fbb a93f73ba (38796ae8) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	d343ff7a 	lsr	x26, x27, #3
   4:	f90017e8 	str	x8, [sp, #40]
   8:	a93e5fbb 	stp	x27, x23, [x29, #-32]
   c:	a93f73ba 	stp	x26, x28, [x29, #-16]
* 10:	38796ae8 	ldrb	w8, [x23, x25] <-- trapping instruction