------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 0 PID: 9666 at lib/refcount.c:28 refcount_warn_saturate+0x15a/0x1d0 lib/refcount.c:28
Modules linked in:
CPU: 0 UID: 0 PID: 9666 Comm: syz-executor Not tainted 6.14.0-rc2-syzkaller-00576-gde7a88b639d4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:refcount_warn_saturate+0x15a/0x1d0 lib/refcount.c:28
Code: 60 a1 80 8c e8 47 57 8c fc 90 0f 0b 90 90 eb 99 e8 1b 94 cc fc c6 05 97 da 31 0b 01 90 48 c7 c7 c0 a1 80 8c e8 27 57 8c fc 90 <0f> 0b 90 90 e9 76 ff ff ff e8 f8 93 cc fc c6 05 71 da 31 0b 01 90
RSP: 0018:ffffc9000405f738 EFLAGS: 00010246
RAX: 63b376dc759c6200 RBX: ffff88804d8bc878 RCX: ffff88801eb9da00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000003 R08: ffffffff81817d12 R09: fffffbfff1d3a614
R10: dffffc0000000000 R11: fffffbfff1d3a614 R12: ffff88804d8bc860
R13: ffffffff86384f30 R14: 1ffff11009b1790c R15: ffff88804d8bc860
FS:  0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc569829f98 CR3: 000000007e422000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __refcount_sub_and_test include/linux/refcount.h:275 [inline]
 __refcount_dec_and_test include/linux/refcount.h:307 [inline]
 refcount_dec_and_test include/linux/refcount.h:325 [inline]
 kref_put include/linux/kref.h:64 [inline]
 klist_dec_and_del+0x3ec/0x3f0 lib/klist.c:206
 klist_put lib/klist.c:217 [inline]
 klist_del lib/klist.c:230 [inline]
 klist_remove+0x25e/0x480 lib/klist.c:249
 device_move+0x1b4/0x710 drivers/base/core.c:4591
 hci_conn_del_sysfs+0xb5/0x170 net/bluetooth/hci_sysfs.c:75
 hci_conn_cleanup net/bluetooth/hci_conn.c:174 [inline]
 hci_conn_del+0x8c4/0xc40 net/bluetooth/hci_conn.c:1164
 hci_conn_hash_flush+0x258/0x350 net/bluetooth/hci_conn.c:2699
 hci_dev_close_sync+0xa8b/0x1260 net/bluetooth/hci_sync.c:5197
 hci_dev_do_close net/bluetooth/hci_core.c:482 [inline]
 hci_unregister_dev+0x20b/0x510 net/bluetooth/hci_core.c:2677
 vhci_release+0x80/0xd0 drivers/bluetooth/hci_vhci.c:664
 __fput+0x3e9/0x9f0 fs/file_table.c:464
 task_work_run+0x24f/0x310 kernel/task_work.c:227
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0xa2a/0x28e0 kernel/exit.c:938
 do_group_exit+0x207/0x2c0 kernel/exit.c:1087
 __do_sys_exit_group kernel/exit.c:1098 [inline]
 __se_sys_exit_group kernel/exit.c:1096 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1096
 x64_sys_call+0x26a8/0x26b0 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2ed118cde9
Code: Unable to access opcode bytes at 0x7f2ed118cdbf.
RSP: 002b:00007ffe62f64298 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2ed118cde9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000043
RBP: 00007f2ed11ed8d0 R08: 00007ffe62f62037 R09: 0000000000000003
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000003 R14: 00000000ffffffff R15: 00007ffe62f64450
 </TASK>