------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(!test_bit(class_idx, lock_classes_in_use)) WARNING: CPU: 0 PID: 2994 at kernel/locking/lockdep.c:4396 __lock_acquire+0x102a/0x5640 kernel/locking/lockdep.c:4396 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 2994 Comm: kworker/0:3 Not tainted 5.8.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events l2cap_chan_timeout Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x18f/0x20d lib/dump_stack.c:118 panic+0x2e3/0x75c kernel/panic.c:231 __warn.cold+0x20/0x45 kernel/panic.c:600 report_bug+0x1bd/0x210 lib/bug.c:198 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:234 exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:254 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536 RIP: 0010:__lock_acquire+0x102a/0x5640 kernel/locking/lockdep.c:4396 Code: d2 0f 85 1e 43 00 00 44 8b 3d ca de 57 09 45 85 ff 0f 85 af fd ff ff 48 c7 c6 c0 cf 4b 88 48 c7 c7 80 a4 4b 88 e8 b8 35 eb ff <0f> 0b e9 98 fd ff ff bb 02 00 00 00 e9 d8 f5 ff ff 48 c7 c2 a0 81 RSP: 0018:ffffc90000eb78e0 EFLAGS: 00010086 RAX: 0000000000000000 RBX: ffffffffd9ac04a0 RCX: 0000000000000000 RDX: ffff8880a3e464c0 RSI: ffffffff815db887 RDI: fffff520001d6f0e RBP: ffff8880a3e46e30 R08: 0000000000000000 R09: ffffffff89bcad23 R10: 0000000000000da0 R11: 0000000000000001 R12: 0000000000000000 R13: ffff8880a3e46e52 R14: ffff8880a3e464c0 R15: 0000000000000000 lock_acquire+0x1f1/0xad0 kernel/locking/lockdep.c:5005 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline] _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:175 spin_lock_bh include/linux/spinlock.h:359 [inline] lock_sock_nested+0x3b/0x110 net/core/sock.c:3048 l2cap_sock_teardown_cb+0x88/0x400 net/bluetooth/l2cap_sock.c:1520 l2cap_chan_del+0xad/0x1300 net/bluetooth/l2cap_core.c:618 l2cap_chan_close+0x118/0xb10 net/bluetooth/l2cap_core.c:823 l2cap_chan_timeout+0x173/0x450 net/bluetooth/l2cap_core.c:436 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Kernel Offset: disabled Rebooting in 86400 seconds..