syzbot

Oops: stack segment: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 7579 Comm: syz.4.427 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:kernfs_rename_ns+0x3a/0x7a0 fs/kernfs/dir.c:1747
Code: ec 48 48 89 cb 48 89 54 24 10 49 89 f5 49 89 fe 49 bc 00 00 00 00 00 fc ff df e8 11 0a 5e ff 4d 8d 7e 30 4c 89 fd 48 c1 ed 03 <42> 80 7c 25 00 00 74 08 4c 89 ff e8 06 ee c3 ff 49 83 3f 00 0f 84
RSP: 0018:ffffc9000c4675a0 EFLAGS: 00010206
RAX: ffffffff8263404f RBX: 0000000000000000 RCX: ffff888025915b80
RDX: 0000000000000000 RSI: ffff8881426dc0f0 RDI: 0000000000000000
RBP: 0000000000000006 R08: ffff888025915b80 R09: 0000000000000008
R10: 0000000000000007 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff8881426dc0f0 R14: 0000000000000000 R15: 0000000000000030
FS:  0000000000000000(0000) GS:ffff8881261b1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000093e030 CR3: 0000000076312000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 kobject_move+0x525/0x6e0 lib/kobject.c:569
 device_move+0xe0/0x700 drivers/base/core.c:4606
 hci_conn_del_sysfs+0xb8/0x170 net/bluetooth/hci_sysfs.c:75
 hci_conn_cleanup net/bluetooth/hci_conn.c:173 [inline]
 hci_conn_del+0xc36/0x11b0 net/bluetooth/hci_conn.c:1234
 hci_conn_hash_flush+0x191/0x230 net/bluetooth/hci_conn.c:2638
 hci_dev_close_sync+0x821/0xff0 net/bluetooth/hci_sync.c:5326
 hci_dev_do_close net/bluetooth/hci_core.c:501 [inline]
 hci_unregister_dev+0x21a/0x510 net/bluetooth/hci_core.c:2715
 vhci_release+0x152/0x1a0 drivers/bluetooth/hci_vhci.c:690
 __fput+0x44c/0xa70 fs/file_table.c:468
 task_work_run+0x1d4/0x260 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x6c5/0x2310 kernel/exit.c:973
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1114
 get_signal+0x1285/0x1340 kernel/signal.c:3034
 arch_do_signal_or_restart+0x9a/0x7a0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop+0x87/0x4f0 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x2e3/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa9e5f8f749
Code: Unable to access opcode bytes at 0x7fa9e5f8f71f.
RSP: 002b:00007fa9e6e9f0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fa9e61e6188 RCX: 00007fa9e5f8f749
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fa9e61e6188
RBP: 00007fa9e61e6180 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa9e61e6218 R14: 00007ffc6a8e8860 R15: 00007ffc6a8e8948
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:kernfs_rename_ns+0x3a/0x7a0 fs/kernfs/dir.c:1747
Code: ec 48 48 89 cb 48 89 54 24 10 49 89 f5 49 89 fe 49 bc 00 00 00 00 00 fc ff df e8 11 0a 5e ff 4d 8d 7e 30 4c 89 fd 48 c1 ed 03 <42> 80 7c 25 00 00 74 08 4c 89 ff e8 06 ee c3 ff 49 83 3f 00 0f 84
RSP: 0018:ffffc9000c4675a0 EFLAGS: 00010206
RAX: ffffffff8263404f RBX: 0000000000000000 RCX: ffff888025915b80
RDX: 0000000000000000 RSI: ffff8881426dc0f0 RDI: 0000000000000000
RBP: 0000000000000006 R08: ffff888025915b80 R09: 0000000000000008
R10: 0000000000000007 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff8881426dc0f0 R14: 0000000000000000 R15: 0000000000000030
FS:  0000000000000000(0000) GS:ffff8881260b1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000b24030 CR3: 0000000076312000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	ec                   	in     (%dx),%al
   1:	48                   	rex.W
   2:	48 89 cb             	mov    %rcx,%rbx
   5:	48 89 54 24 10       	mov    %rdx,0x10(%rsp)
   a:	49 89 f5             	mov    %rsi,%r13
   d:	49 89 fe             	mov    %rdi,%r14
  10:	49 bc 00 00 00 00 00 	movabs $0xdffffc0000000000,%r12
  17:	fc ff df
  1a:	e8 11 0a 5e ff       	call   0xff5e0a30
  1f:	4d 8d 7e 30          	lea    0x30(%r14),%r15
  23:	4c 89 fd             	mov    %r15,%rbp
  26:	48 c1 ed 03          	shr    $0x3,%rbp
* 2a:	42 80 7c 25 00 00    	cmpb   $0x0,0x0(%rbp,%r12,1) <-- trapping instruction
  30:	74 08                	je     0x3a
  32:	4c 89 ff             	mov    %r15,%rdi
  35:	e8 06 ee c3 ff       	call   0xffc3ee40
  3a:	49 83 3f 00          	cmpq   $0x0,(%r15)
  3e:	0f                   	.byte 0xf
  3f:	84                   	.byte 0x84