syzbot

Oops: general protection fault, probably for non-canonical address 0xdffffc000000000b: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000058-0x000000000000005f]
CPU: 0 UID: 0 PID: 13123 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:klist_put+0x4d/0x1d0 lib/klist.c:212
Code: c1 ea 03 80 3c 02 00 0f 85 74 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 23 49 83 e4 fe 49 8d 7c 24 58 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 43 01 00 00 4c 89 e7 4d 8b 74 24 58 e8 1c 0f 0d
RSP: 0018:ffffc90005e3f6f0 EFLAGS: 00010212
RAX: dffffc0000000000 RBX: ffff88807acda460 RCX: 0000000000000000
RDX: 000000000000000b RSI: ffffffff8b8b0345 RDI: 0000000000000058
RBP: 0000000000000001 R08: 0000000000000000 R09: fffffbfff217a5c8
R10: ffffffff90bd2e43 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000001 R14: ffffffff90bd2e00 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff88812431b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5616c4f270 CR3: 0000000075b9d000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 klist_del lib/klist.c:230 [inline]
 klist_remove+0x14c/0x2e0 lib/klist.c:249
 device_move+0x12d/0x1140 drivers/base/core.c:4698
 hci_conn_del_sysfs+0x86/0x1a0 net/bluetooth/hci_sysfs.c:75
 hci_conn_cleanup net/bluetooth/hci_conn.c:170 [inline]
 hci_conn_del+0x506/0x1180 net/bluetooth/hci_conn.c:1306
 hci_conn_hash_flush+0x186/0x280 net/bluetooth/hci_conn.c:2734
 hci_dev_close_sync+0x5cf/0x13c0 net/bluetooth/hci_sync.c:5405
 hci_dev_do_close+0x2e/0xb0 net/bluetooth/hci_core.c:499
 hci_unregister_dev+0x23f/0x690 net/bluetooth/hci_core.c:2678
 vhci_release+0x17d/0x230 drivers/bluetooth/hci_vhci.c:700
 __fput+0x3ff/0xb50 fs/file_table.c:512
 task_work_run+0x150/0x240 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x951/0x2ae0 kernel/exit.c:1004
 do_group_exit+0xd5/0x2a0 kernel/exit.c:1147
 get_signal+0x1ec7/0x21e0 kernel/signal.c:3038
 arch_do_signal_or_restart+0x91/0x7e0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
 exit_to_user_mode_loop+0x139/0x6f0 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x666/0x870 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ffb7af9e62a
Code: Unable to access opcode bytes at 0x7ffb7af9e600.
RSP: 002b:00007ffebc923ce8 EFLAGS: 00000216 ORIG_RAX: 0000000000000037
RAX: 0000000000000000 RBX: 00007ffebc923d70 RCX: 00007ffb7af9e62a
RDX: 0000000000000041 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000003 R08: 00007ffebc923d0c R09: 0000000000000000
R10: 00007ffebc923d70 R11: 0000000000000216 R12: 00007ffb7b1eafc0
R13: 00007ffebc923d0c R14: 0000000000000000 R15: 00007ffb7b1ed180
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:klist_put+0x4d/0x1d0 lib/klist.c:212
Code: c1 ea 03 80 3c 02 00 0f 85 74 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 23 49 83 e4 fe 49 8d 7c 24 58 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 43 01 00 00 4c 89 e7 4d 8b 74 24 58 e8 1c 0f 0d
RSP: 0018:ffffc90005e3f6f0 EFLAGS: 00010212
RAX: dffffc0000000000 RBX: ffff88807acda460 RCX: 0000000000000000
RDX: 000000000000000b RSI: ffffffff8b8b0345 RDI: 0000000000000058
RBP: 0000000000000001 R08: 0000000000000000 R09: fffffbfff217a5c8
R10: ffffffff90bd2e43 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000001 R14: ffffffff90bd2e00 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff88812441b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa6c51ea540 CR3: 0000000072f9c000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
   0:	c1 ea 03             	shr    $0x3,%edx
   3:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   7:	0f 85 74 01 00 00    	jne    0x181
   d:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  14:	fc ff df
  17:	4c 8b 23             	mov    (%rbx),%r12
  1a:	49 83 e4 fe          	and    $0xfffffffffffffffe,%r12
  1e:	49 8d 7c 24 58       	lea    0x58(%r12),%rdi
  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 43 01 00 00    	jne    0x177
  34:	4c 89 e7             	mov    %r12,%rdi
  37:	4d 8b 74 24 58       	mov    0x58(%r12),%r14
  3c:	e8                   	.byte 0xe8
  3d:	1c 0f                	sbb    $0xf,%al
  3f:	0d                   	.byte 0xd