------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(!test_bit(class_idx, lock_classes_in_use)) WARNING: CPU: 3 PID: 30572 at kernel/locking/lockdep.c:4396 __lock_acquire+0xfd3/0x5570 kernel/locking/lockdep.c:4396 Kernel panic - not syncing: panic_on_warn set ... CPU: 3 PID: 30572 Comm: kworker/3:3 Not tainted 5.9.0-rc4-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 Workqueue: events l2cap_chan_timeout Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x198/0x1fd lib/dump_stack.c:118 panic+0x347/0x7c0 kernel/panic.c:231 __warn.cold+0x20/0x46 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+0xfd3/0x5570 kernel/locking/lockdep.c:4396 Code: d2 0f 85 47 39 00 00 44 8b 3d 91 8c 58 09 45 85 ff 0f 85 af fd ff ff 48 c7 c6 a0 d3 4b 88 48 c7 c7 20 a8 4b 88 e8 7f 3c eb ff <0f> 0b e9 98 fd ff ff bb 02 00 00 00 e9 07 f6 ff ff 48 c7 c2 60 31 RSP: 0018:ffffc9000739f8e8 EFLAGS: 00010082 RAX: 0000000000000000 RBX: ffffffffb2178a0c RCX: 0000000000000000 RDX: ffff888019a68d40 RSI: ffffffff815db9a7 RDI: fffff52000e73f0f RBP: ffff888019a696c8 R08: 0000000000000000 R09: ffffffff89bcb4a3 R10: 0000000000001535 R11: 0000000000000000 R12: 0000000000000000 R13: ffff888019a696ea R14: ffff888019a68d40 R15: 0000000000000000 lock_acquire+0x1f3/0xae0 kernel/locking/lockdep.c:5006 __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..