syzbot

general protection fault, probably for non-canonical address 0xdffffc0000000026: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000130-0x0000000000000137]
CPU: 0 PID: 6016 Comm: kworker/0:7 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: events l2cap_info_timeout
RIP: 0010:__lock_acquire+0xeb/0x7c80 kernel/locking/lockdep.c:5005
Code: 85 dc 66 00 00 83 3d 7f bf e3 0c 00 48 89 9c 24 f0 00 00 00 0f 84 11 10 00 00 83 3d ae c6 58 0b 00 74 36 48 89 f8 48 c1 e8 03 <42> 80 3c 00 00 74 1f 48 8b bc 24 88 00 00 00 e8 61 cf 75 00 48 8b
RSP: 0018:ffffc900036f7600 EFLAGS: 00010002
RAX: 0000000000000026 RBX: 1ffff920006deee4 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000130
RBP: ffffc900036f7848 R08: dffffc0000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1c95226 R12: 0000000000000001
R13: 0000000000000000 R14: ffff88802b6c8000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4a94d837e8 CR3: 0000000060e4c000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
 lock_sock_nested+0x48/0x100 net/core/sock.c:3527
 lock_sock include/net/sock.h:1731 [inline]
 l2cap_sock_ready_cb+0x45/0x130 net/bluetooth/l2cap_sock.c:1658
 l2cap_chan_ready net/bluetooth/l2cap_core.c:1263 [inline]
 l2cap_conn_start+0x753/0xe40 net/bluetooth/l2cap_core.c:1512
 l2cap_info_timeout+0x68/0xa0 net/bluetooth/l2cap_core.c:1669
 process_one_work kernel/workqueue.c:2634 [inline]
 process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__lock_acquire+0xeb/0x7c80 kernel/locking/lockdep.c:5005
Code: 85 dc 66 00 00 83 3d 7f bf e3 0c 00 48 89 9c 24 f0 00 00 00 0f 84 11 10 00 00 83 3d ae c6 58 0b 00 74 36 48 89 f8 48 c1 e8 03 <42> 80 3c 00 00 74 1f 48 8b bc 24 88 00 00 00 e8 61 cf 75 00 48 8b
RSP: 0018:ffffc900036f7600 EFLAGS: 00010002
RAX: 0000000000000026 RBX: 1ffff920006deee4 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000130
RBP: ffffc900036f7848 R08: dffffc0000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1c95226 R12: 0000000000000001
R13: 0000000000000000 R14: ffff88802b6c8000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4a94d837e8 CR3: 0000000060e4c000 CR4: 00000000003506f0
----------------
Code disassembly (best guess):
   0:	85 dc                	test   %ebx,%esp
   2:	66 00 00             	data16 add %al,(%rax)
   5:	83 3d 7f bf e3 0c 00 	cmpl   $0x0,0xce3bf7f(%rip)        # 0xce3bf8b
   c:	48 89 9c 24 f0 00 00 	mov    %rbx,0xf0(%rsp)
  13:	00
  14:	0f 84 11 10 00 00    	je     0x102b
  1a:	83 3d ae c6 58 0b 00 	cmpl   $0x0,0xb58c6ae(%rip)        # 0xb58c6cf
  21:	74 36                	je     0x59
  23:	48 89 f8             	mov    %rdi,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 00 00       	cmpb   $0x0,(%rax,%r8,1) <-- trapping instruction
  2f:	74 1f                	je     0x50
  31:	48 8b bc 24 88 00 00 	mov    0x88(%rsp),%rdi
  38:	00
  39:	e8 61 cf 75 00       	call   0x75cf9f
  3e:	48                   	rex.W
  3f:	8b                   	.byte 0x8b