------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(!test_bit(class_idx, lock_classes_in_use))
WARNING: CPU: 1 PID: 2939 at kernel/locking/lockdep.c:4872 __lock_acquire+0xfbf/0x5230 kernel/locking/lockdep.c:4872
Modules linked in:
CPU: 1 PID: 2939 Comm: kworker/1:8 Not tainted 5.12.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events l2cap_chan_timeout
RIP: 0010:__lock_acquire+0xfbf/0x5230 kernel/locking/lockdep.c:4872
Code: d2 0f 85 26 36 00 00 44 8b 3d c5 74 6f 0c 45 85 ff 0f 85 b1 fd ff ff 48 c7 c6 80 e2 6b 89 48 c7 c7 c0 b3 6b 89 e8 84 c4 7a 07 <0f> 0b e9 9a fd ff ff 41 bd 02 00 00 00 e9 32 f6 ff ff 48 c7 c2 20
RSP: 0018:ffffc9000c93f908 EFLAGS: 00010086
RAX: 0000000000000000 RBX: fffffffffff3e5d7 RCX: 0000000000000000
RDX: ffff888060fd8000 RSI: ffffffff815ccd65 RDI: fffff52001927f13
RBP: ffff888060fd8a98 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff815c6bce R11: 0000000000000000 R12: ffff888060fd8000
R13: ffff888060fd8aba R14: ffff888060fd89f8 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe7e0124718 CR3: 000000008490f000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 lock_acquire kernel/locking/lockdep.c:5512 [inline]
 lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5477
 __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+0x40/0x120 net/core/sock.c:3057
 l2cap_sock_teardown_cb+0xa1/0x660 net/bluetooth/l2cap_sock.c:1528
 l2cap_chan_del+0xbc/0xa80 net/bluetooth/l2cap_core.c:622
 l2cap_chan_close+0x1bc/0xaf0 net/bluetooth/l2cap_core.c:825
 l2cap_chan_timeout+0x17e/0x2f0 net/bluetooth/l2cap_core.c:436
 process_one_work+0x98d/0x1600 kernel/workqueue.c:2275
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
 kthread+0x3b1/0x4a0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294