syzbot

Oops: general protection fault, probably for non-canonical address 0xdffffc000000004b: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000258-0x000000000000025f]
CPU: 0 UID: 0 PID: 6131 Comm: kworker/0:6 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Workqueue: events l2cap_info_timeout
RIP: 0010:kasan_byte_accessible+0x12/0x30 mm/kasan/generic.c:210
Code: 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 48 c1 ef 03 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 07 3c 08 0f 92 c0 e9 0b 37 ec fe cc 66 66 66 66 66 66 2e
RSP: 0018:ffffc900031177a8 EFLAGS: 00010216
RAX: dffffc0000000000 RBX: ffffffff891ab808 RCX: c6195d22a659cd00
RDX: 0000000000000000 RSI: ffffffff891ab808 RDI: 000000000000004b
RBP: ffffffff8a459a05 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffffff8a4599c0 R12: 0000000000000000
R13: 0000000000000258 R14: 0000000000000258 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888126396000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001180 CR3: 0000000027e57000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 __kasan_check_byte+0x12/0x40 mm/kasan/common.c:579
 kasan_check_byte include/linux/kasan.h:401 [inline]
 lock_acquire+0x8d/0x360 kernel/locking/lockdep.c:5842
 lock_sock_nested+0x48/0x100 net/core/sock.c:3720
 lock_sock include/net/sock.h:1679 [inline]
 l2cap_sock_ready_cb+0x45/0x140 net/bluetooth/l2cap_sock.c:1677
 l2cap_chan_ready net/bluetooth/l2cap_core.c:1263 [inline]
 l2cap_conn_start+0x76d/0xe50 net/bluetooth/l2cap_core.c:1512
 l2cap_info_timeout+0x68/0xa0 net/bluetooth/l2cap_core.c:1669
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x439/0x7d0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:kasan_byte_accessible+0x12/0x30 mm/kasan/generic.c:210
Code: 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 48 c1 ef 03 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 07 3c 08 0f 92 c0 e9 0b 37 ec fe cc 66 66 66 66 66 66 2e
RSP: 0018:ffffc900031177a8 EFLAGS: 00010216
RAX: dffffc0000000000 RBX: ffffffff891ab808 RCX: c6195d22a659cd00
RDX: 0000000000000000 RSI: ffffffff891ab808 RDI: 000000000000004b
RBP: ffffffff8a459a05 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffffff8a4599c0 R12: 0000000000000000
R13: 0000000000000258 R14: 0000000000000258 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888126396000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557901e588 CR3: 00000000262a9000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
   0:	0f 1f 84 00 00 00 00 	nopl   0x0(%rax,%rax,1)
   7:	00
   8:	90                   	nop
   9:	90                   	nop
   a:	90                   	nop
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	66 0f 1f 00          	nopw   (%rax)
  1c:	48 c1 ef 03          	shr    $0x3,%rdi
  20:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  27:	fc ff df
* 2a:	0f b6 04 07          	movzbl (%rdi,%rax,1),%eax <-- trapping instruction
  2e:	3c 08                	cmp    $0x8,%al
  30:	0f 92 c0             	setb   %al
  33:	e9 0b 37 ec fe       	jmp    0xfeec3743
  38:	cc                   	int3
  39:	66                   	data16
  3a:	66                   	data16
  3b:	66                   	data16
  3c:	66                   	data16
  3d:	66                   	data16
  3e:	66                   	data16
  3f:	2e                   	cs