syzbot

Unable to handle kernel paging request at virtual address dfff80000000005f
KASAN: null-ptr-deref in range [0x00000000000002f8-0x00000000000002ff]
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
[dfff80000000005f] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4514 Comm: syz.0.33 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
pstate: 22400005 (nzCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : h5_recv+0x11c/0x7c0 drivers/bluetooth/hci_h5.c:569
lr : h5_recv+0xc4/0x7c0 drivers/bluetooth/hci_h5.c:566
sp : ffff800020957a80
x29: ffff800020957b70 x28: 0000000000000308 x27: 0000000000000004
x26: dfff800000000000 x25: ffff0000cc778400 x24: dfff800000000000
x23: 00000000000002e8 x22: 00000000000002f8 x21: ffff800020957c40
x20: 0000000000000001 x19: 000000000000005f x18: 0000000000000000
x17: 0000000000000000 x16: ffff8000082d2558 x15: 0000000000000000
x14: 0000000080045440 x13: 1ffff00002a0a0b1 x12: 0000000000ff0100
x11: ff0080000eb1402c x10: 0000000000000061 x9 : 1fffe000198ef082
x8 : 000000000000005e x7 : ffff80000eb09024 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff8000131d1d20
x2 : 0000000000000001 x1 : 0000000000000001 x0 : 0000000000000000
Call trace:
 h5_recv+0x11c/0x7c0 drivers/bluetooth/hci_h5.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: f9001fe9 d343fd29 f90023e8 f9001be9 (387a6a68) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	f9001fe9 	str	x9, [sp, #56]
   4:	d343fd29 	lsr	x9, x9, #3
   8:	f90023e8 	str	x8, [sp, #64]
   c:	f9001be9 	str	x9, [sp, #48]
* 10:	387a6a68 	ldrb	w8, [x19, x26] <-- trapping instruction