------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(1)
WARNING: CPU: 2 PID: 11977 at kernel/locking/lockdep.c:202 hlock_class kernel/locking/lockdep.c:202 [inline]
WARNING: CPU: 2 PID: 11977 at kernel/locking/lockdep.c:202 hlock_class kernel/locking/lockdep.c:191 [inline]
WARNING: CPU: 2 PID: 11977 at kernel/locking/lockdep.c:202 check_wait_context kernel/locking/lockdep.c:4506 [inline]
WARNING: CPU: 2 PID: 11977 at kernel/locking/lockdep.c:202 __lock_acquire+0x165e/0x5500 kernel/locking/lockdep.c:4782
Modules linked in:
CPU: 2 PID: 11977 Comm: kworker/2:9 Not tainted 5.10.0-rc7-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
RIP: 0010:hlock_class kernel/locking/lockdep.c:202 [inline]
RIP: 0010:hlock_class kernel/locking/lockdep.c:191 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4506 [inline]
RIP: 0010:__lock_acquire+0x165e/0x5500 kernel/locking/lockdep.c:4782
Code: 08 84 d2 0f 85 1c 2c 00 00 8b 15 f5 05 97 0b 85 d2 0f 85 5f fa ff ff 48 c7 c6 60 65 4b 89 48 c7 c7 80 5b 4b 89 e8 6e 78 56 07 <0f> 0b e9 45 fa ff ff c7 44 24 60 fe ff ff ff 41 bf 01 00 00 00 c7
RSP: 0018:ffffc900039e7900 EFLAGS: 00010082
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff888012ac2180 RSI: ffffffff8158c865 RDI: fffff5200073cf12
RBP: ffff888012ac2180 R08: 0000000000000001 R09: ffff88802ce2011b
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888012ac2b38
R13: 0000000000001532 R14: ffff888020fc20a0 R15: 0000000000040000
FS:  0000000000000000(0000) GS:ffff88802ce00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f174ad32000 CR3: 0000000014080000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 lock_acquire kernel/locking/lockdep.c:5437 [inline]
 lock_acquire+0x29d/0x740 kernel/locking/lockdep.c:5402
 __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+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296