Bluetooth: hci3: Opcode 0x0c1a failed: -4
Bluetooth: hci3: Error when powering off device on rfkill (-4)
------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 1 PID: 22649 at lib/refcount.c:28 refcount_warn_saturate+0x11a/0x1d0 lib/refcount.c:28
Modules linked in:
CPU: 1 UID: 0 PID: 22649 Comm: syz.2.4175 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:refcount_warn_saturate+0x11a/0x1d0 lib/refcount.c:28
Code: 00 5a be 8b e8 27 80 f9 fc 90 0f 0b 90 90 eb d7 e8 1b 64 36 fd c6 05 21 9a dd 0a 01 90 48 c7 c7 60 5a be 8b e8 07 80 f9 fc 90 <0f> 0b 90 90 eb b7 e8 fb 63 36 fd c6 05 fe 99 dd 0a 01 90 48 c7 c7
RSP: 0018:ffffc9000be977b8 EFLAGS: 00010246
RAX: 526ea6f9ca325400 RBX: 0000000000000003 RCX: 0000000000080000
RDX: ffffc9000cb21000 RSI: 000000000003028c RDI: 000000000003028d
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bba684 R12: ffff888048a94400
R13: ffff888048f78860 R14: ffff888048f78878 R15: dffffc0000000000
FS:  00007fce171f66c0(0000) GS:ffff88812622e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc7f7784d58 CR3: 0000000061a4a000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __refcount_sub_and_test include/linux/refcount.h:400 [inline]
 __refcount_dec_and_test include/linux/refcount.h:432 [inline]
 refcount_dec_and_test include/linux/refcount.h:450 [inline]
 kref_put include/linux/kref.h:64 [inline]
 klist_dec_and_del+0x3c7/0x3d0 lib/klist.c:206
 klist_put lib/klist.c:217 [inline]
 klist_del lib/klist.c:230 [inline]
 klist_remove+0x1bd/0x340 lib/klist.c:249
 device_move+0x193/0x700 drivers/base/core.c:4615
 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+0x2f/0x90 net/bluetooth/hci_core.c:501
 hci_rfkill_set_block+0x21d/0x2e0 net/bluetooth/hci_core.c:929
 rfkill_set_block+0x1d2/0x440 net/rfkill/core.c:346
 rfkill_fop_write+0x44b/0x570 net/rfkill/core.c:1301
 vfs_write+0x27e/0xb30 fs/read_write.c:684
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fce18f8f749
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:00007fce171f6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fce191e5fa0 RCX: 00007fce18f8f749
RDX: 0000000000000008 RSI: 0000200000000080 RDI: 0000000000000009
RBP: 00007fce19013f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fce191e6038 R14: 00007fce191e5fa0 R15: 00007fff9fc90e18
 </TASK>