Oops: general protection fault, probably for non-canonical address 0xdffffc000000000e: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000070-0x0000000000000077]
CPU: 1 UID: 0 PID: 26033 Comm: syz.3.5753 Not tainted 6.13.0-syzkaller-07644-gc2da8b3f914f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:564 [inline]
RIP: 0010:__mutex_lock+0x151/0xb10 kernel/locking/mutex.c:730
Code: d0 7c 08 84 d2 0f 85 71 07 00 00 8b 35 08 96 3a 0f 85 f6 75 29 48 8d 7b 60 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 59 07 00 00 48 3b 5b 60 0f 85 e7 01 00 00 bf 01
RSP: 0018:ffffc9000ce07a80 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000010 RCX: 1ffffffff3503314
RDX: 000000000000000e RSI: 0000000000000000 RDI: 0000000000000070
RBP: ffffc9000ce07bc0 R08: ffffffff8a5358f7 R09: 0000000000000006
R10: ffffc9000ce07bd8 R11: 0000000000000001 R12: dffffc0000000000
R13: 0000000000000002 R14: 0000000000000000 R15: ffffc9000ce07b00
FS:  00007f5eacaaa6c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f820224 CR3: 000000006e4ce000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 hci_devcd_register+0x47/0x170 net/bluetooth/coredump.c:415
 force_devcd_write+0x175/0x350 drivers/bluetooth/hci_vhci.c:346
 full_proxy_write+0xfd/0x1b0 fs/debugfs/file.c:369
 vfs_write+0x24c/0x1150 fs/read_write.c:677
 ksys_write+0x12b/0x250 fs/read_write.c:731
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5eabb8cd29
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:00007f5eacaaa038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f5eabda5fa0 RCX: 00007f5eabb8cd29
RDX: 000000000000000e RSI: 0000000000000000 RDI: 0000000000000006
RBP: 00007f5eabc0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f5eabda5fa0 R15: 00007ffe9115a928
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:564 [inline]
RIP: 0010:__mutex_lock+0x151/0xb10 kernel/locking/mutex.c:730
Code: d0 7c 08 84 d2 0f 85 71 07 00 00 8b 35 08 96 3a 0f 85 f6 75 29 48 8d 7b 60 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 59 07 00 00 48 3b 5b 60 0f 85 e7 01 00 00 bf 01
RSP: 0018:ffffc9000ce07a80 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000010 RCX: 1ffffffff3503314
RDX: 000000000000000e RSI: 0000000000000000 RDI: 0000000000000070
RBP: ffffc9000ce07bc0 R08: ffffffff8a5358f7 R09: 0000000000000006
R10: ffffc9000ce07bd8 R11: 0000000000000001 R12: dffffc0000000000
R13: 0000000000000002 R14: 0000000000000000 R15: ffffc9000ce07b00
FS:  00007f5eacaaa6c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000556fc80d5680 CR3: 000000006e4ce000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	d0 7c 08 84          	sarb   -0x7c(%rax,%rcx,1)
   4:	d2 0f                	rorb   %cl,(%rdi)
   6:	85 71 07             	test   %esi,0x7(%rcx)
   9:	00 00                	add    %al,(%rax)
   b:	8b 35 08 96 3a 0f    	mov    0xf3a9608(%rip),%esi        # 0xf3a9619
  11:	85 f6                	test   %esi,%esi
  13:	75 29                	jne    0x3e
  15:	48 8d 7b 60          	lea    0x60(%rbx),%rdi
  19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  20:	fc ff df
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 59 07 00 00    	jne    0x78d
  34:	48 3b 5b 60          	cmp    0x60(%rbx),%rbx
  38:	0f 85 e7 01 00 00    	jne    0x225
  3e:	bf                   	.byte 0xbf
  3f:	01                   	.byte 0x1