------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(!test_bit(class_idx, lock_classes_in_use))
WARNING: CPU: 1 PID: 21814 at kernel/locking/lockdep.c:4801 __lock_acquire+0x1044/0x5590 kernel/locking/lockdep.c:4801
Modules linked in:
CPU: 1 PID: 21814 Comm: kworker/1:30 Not tainted 5.10.0-rc2-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+0x1044/0x5590 kernel/locking/lockdep.c:4801
Code: d2 0f 85 ac 32 00 00 44 8b 3d e0 eb 96 0b 45 85 ff 0f 85 af fd ff ff 48 c7 c6 e0 88 4b 89 48 c7 c7 80 5a 4b 89 e8 43 53 56 07 <0f> 0b e9 98 fd ff ff b9 02 00 00 00 e9 ac f5 ff ff 48 c7 c2 20 99
RSP: 0018:ffffc90001b87908 EFLAGS: 00010086
RAX: 0000000000000000 RBX: fffffffffff5a3b0 RCX: 0000000000000000
RDX: ffff88808bdc4ec0 RSI: ffffffff8158d055 RDI: fffff52000370f13
RBP: ffff88808bdc5870 R08: 0000000000000001 R09: ffff8880b9f2005b
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88808bdc4ec0
R13: ffff88808bdc5892 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001590004 CR3: 000000004cb58000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 lock_acquire kernel/locking/lockdep.c:5436 [inline]
 lock_acquire+0x2a3/0x8c0 kernel/locking/lockdep.c:5401
 __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:3036
 l2cap_sock_teardown_cb+0xa1/0x660 net/bluetooth/l2cap_sock.c:1520
 l2cap_chan_del+0xbc/0xa80 net/bluetooth/l2cap_core.c:618
 l2cap_chan_close+0x1bc/0xaf0 net/bluetooth/l2cap_core.c:823
 l2cap_chan_timeout+0x17e/0x2f0 net/bluetooth/l2cap_core.c:436
 process_one_work+0x933/0x15a0 kernel/workqueue.c:2272
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2418
 kthread+0x3af/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296