Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
Workqueue: hci0 hci_error_reset
=====================================================
BUG: KMSAN: uninit-value in show_regs+0xb9/0xd0 arch/x86/kernel/dumpstack.c:469
 show_regs+0xb9/0xd0 arch/x86/kernel/dumpstack.c:469
 __warn+0x242/0x580 kernel/panic.c:621
 report_bug+0x7ff/0xa10 lib/bug.c:198
 handle_bug+0x41/0x70 arch/x86/kernel/traps.c:316
 exc_invalid_op+0x1b/0x50 arch/x86/kernel/traps.c:336
 asm_exc_invalid_op+0x1b/0x20
 refcount_warn_saturate+0x2ce/0x320 lib/refcount.c:28
 __refcount_sub_and_test include/linux/refcount.h:283 [inline]
 __refcount_dec_and_test include/linux/refcount.h:315 [inline]
 refcount_dec_and_test include/linux/refcount.h:333 [inline]
 kref_put include/linux/kref.h:64 [inline]
 l2cap_chan_put+0x245/0x250 net/bluetooth/l2cap_core.c:527
 l2cap_conn_del+0x7dc/0xc00 net/bluetooth/l2cap_core.c:1927
 l2cap_disconn_cfm+0xb8/0xe0 net/bluetooth/l2cap_core.c:8212
 hci_disconn_cfm include/net/bluetooth/hci_core.h:1779 [inline]
 hci_conn_hash_flush+0x157/0x350 net/bluetooth/hci_conn.c:2366
 hci_dev_close_sync+0xf53/0x1640 net/bluetooth/hci_sync.c:4476
 hci_dev_do_close net/bluetooth/hci_core.c:554 [inline]
 hci_error_reset+0x12f/0x1e0 net/bluetooth/hci_core.c:1050
 process_one_work+0xb27/0x13e0 kernel/workqueue.c:2289
 worker_thread+0x1076/0x1d60 kernel/workqueue.c:2436
 kthread+0x31b/0x430 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

Local variable barr created at:
 __flush_work+0x4a/0xaf0 kernel/workqueue.c:3061
 __cancel_work_timer+0x49b/0x640 kernel/workqueue.c:3162

CPU: 0 PID: 3489 Comm: kworker/u5:1 Not tainted 6.0.0-rc5-syzkaller-48539-g523d2ce66d07 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
Workqueue: hci0 hci_error_reset
=====================================================