WARNING: locking bug in l2cap_chan

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	WARNING: locking bug in l2cap_chan_del bluetooth	4	syz	inconclusive	inconclusive	83	1569d	1847d	0/29	auto-obsoleted due to no activity on 2022/09/14 08:47

DEBUG_LOCKS_WARN_ON(class_idx > MAX_LOCKDEP_KEYS) ------------[ cut here ]------------ WARNING: CPU: 0 PID: 18448 at kernel/locking/lockdep.c:3468 __lock_acquire.cold+0x7c0/0x97c kernel/locking/lockdep.c:3468 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 18448 Comm: syz-executor.3 Not tainted 4.14.197-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x283 lib/dump_stack.c:58 panic+0x1f9/0x42d kernel/panic.c:183 __warn.cold+0x20/0x4b kernel/panic.c:547 report_bug+0x208/0x249 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:177 [inline] fixup_bug arch/x86/kernel/traps.c:172 [inline] do_error_trap+0x195/0x2d0 arch/x86/kernel/traps.c:295 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:964 RIP: 0010:__lock_acquire.cold+0x7c0/0x97c kernel/locking/lockdep.c:3468 RSP: 0018:ffff88809716f5a8 EFLAGS: 00010086 RAX: 0000000000000031 RBX: 0000000000000006 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffed1012e2deab RBP: ffff888088b68f32 R08: 0000000000000031 R09: 0000000000000000 R10: 0000000000000001 R11: 0000006aea20cfc0 R12: ffff888088b68f28 R13: 0000000000000000 R14: 00000000b6d7a62f R15: ffffffff8a5a8c00 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline] _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:176 spin_lock_bh include/linux/spinlock.h:322 [inline] lock_sock_nested+0x39/0x100 net/core/sock.c:2788 l2cap_sock_teardown_cb+0x7b/0x400 net/bluetooth/l2cap_sock.c:1329 l2cap_chan_del+0xa0/0x800 net/bluetooth/l2cap_core.c:596 l2cap_conn_del+0x35f/0x670 net/bluetooth/l2cap_core.c:1726 l2cap_disconn_cfm net/bluetooth/l2cap_core.c:7435 [inline] l2cap_disconn_cfm+0x6b/0x80 net/bluetooth/l2cap_core.c:7428 hci_disconn_cfm include/net/bluetooth/hci_core.h:1226 [inline] hci_conn_hash_flush+0x114/0x220 net/bluetooth/hci_conn.c:1376 hci_dev_do_close+0x542/0xc50 net/bluetooth/hci_core.c:1620 hci_unregister_dev+0x170/0x7a0 net/bluetooth/hci_core.c:3191 vhci_release+0x70/0xe0 drivers/bluetooth/hci_vhci.c:354 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xa08/0x27f0 kernel/exit.c:865 do_group_exit+0x100/0x2e0 kernel/exit.c:962 get_signal+0x38d/0x1ca0 kernel/signal.c:2423 do_signal+0x7c/0x1550 arch/x86/kernel/signal.c:814 exit_to_usermode_loop+0x160/0x200 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45d5b9 RSP: 002b:00007f75d6220cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000118d128 RCX: 000000000045d5b9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000118d128 RBP: 000000000118d120 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118d12c R13: 00007ffc56c994ef R14: 00007f75d62219c0 R15: 000000000118d12c Kernel Offset: disabled Rebooting in 86400 seconds..