Oops: general protection fault, probably for non-canonical address 0xdffffc0000000021: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000108-0x000000000000010f]
CPU: 1 UID: 0 PID: 6809 Comm: syz.4.25 Not tainted 6.16.0-rc2-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:bcsp_recv+0xe2/0x1620 drivers/bluetooth/hci_bcsp.c:590
Code: e8 48 89 6c 24 10 48 89 cd 48 c1 e8 03 48 89 44 24 38 48 89 4c 24 30 4c 89 64 24 18 4c 89 6c 24 40 89 5c 24 04 48 8b 44 24 28 <42> 80 3c 38 00 74 08 48 89 ef e8 ef 34 17 fa 48 8b 5d 00 31 ff 48
RSP: 0018:ffffc9000402fcc0 EFLAGS: 00010206
RAX: 0000000000000021 RBX: 0000000000000001 RCX: 0000000000000108
RDX: 0000000000000178 RSI: 000000000000002f RDI: 0000000000000000
RBP: 0000000000000108 R08: ffff88805504881f R09: 1ffff1100aa09103
R10: dffffc0000000000 R11: ffffffff8806bf20 R12: 0000000000000110
R13: 000000000000002f R14: ffffc9000402fe00 R15: dffffc0000000000
FS:  00007f99811816c0(0000) GS:ffff888126c2e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9981180f98 CR3: 000000007c5e0000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 hci_uart_tty_receive+0x194/0x220 drivers/bluetooth/hci_ldisc.c:627
 tiocsti+0x239/0x2c0 drivers/tty/tty_io.c:2290
 tty_ioctl+0x626/0xde0 drivers/tty/tty_io.c:2706
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x8a/0x300 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f998038e929
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9981181038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f99805b6080 RCX: 00007f998038e929
RDX: 0000200000000140 RSI: 0000000000005412 RDI: 0000000000000004
RBP: 00007f9980410b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f99805b6080 R15: 00007ffee64336e8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bcsp_recv+0xe2/0x1620 drivers/bluetooth/hci_bcsp.c:590
Code: e8 48 89 6c 24 10 48 89 cd 48 c1 e8 03 48 89 44 24 38 48 89 4c 24 30 4c 89 64 24 18 4c 89 6c 24 40 89 5c 24 04 48 8b 44 24 28 <42> 80 3c 38 00 74 08 48 89 ef e8 ef 34 17 fa 48 8b 5d 00 31 ff 48
RSP: 0018:ffffc9000402fcc0 EFLAGS: 00010206
RAX: 0000000000000021 RBX: 0000000000000001 RCX: 0000000000000108
RDX: 0000000000000178 RSI: 000000000000002f RDI: 0000000000000000
RBP: 0000000000000108 R08: ffff88805504881f R09: 1ffff1100aa09103
R10: dffffc0000000000 R11: ffffffff8806bf20 R12: 0000000000000110
R13: 000000000000002f R14: ffffc9000402fe00 R15: dffffc0000000000
FS:  00007f99811816c0(0000) GS:ffff888126b2e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc1b4739d58 CR3: 000000007c5e0000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	e8 48 89 6c 24       	call   0x246c894d
   5:	10 48 89             	adc    %cl,-0x77(%rax)
   8:	cd 48                	int    $0x48
   a:	c1 e8 03             	shr    $0x3,%eax
   d:	48 89 44 24 38       	mov    %rax,0x38(%rsp)
  12:	48 89 4c 24 30       	mov    %rcx,0x30(%rsp)
  17:	4c 89 64 24 18       	mov    %r12,0x18(%rsp)
  1c:	4c 89 6c 24 40       	mov    %r13,0x40(%rsp)
  21:	89 5c 24 04          	mov    %ebx,0x4(%rsp)
  25:	48 8b 44 24 28       	mov    0x28(%rsp),%rax
* 2a:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 ef             	mov    %rbp,%rdi
  34:	e8 ef 34 17 fa       	call   0xfa173528
  39:	48 8b 5d 00          	mov    0x0(%rbp),%rbx
  3d:	31 ff                	xor    %edi,%edi
  3f:	48                   	rex.W