------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(1) WARNING: CPU: 3 PID: 9480 at kernel/locking/lockdep.c:202 hlock_class kernel/locking/lockdep.c:202 [inline] WARNING: CPU: 3 PID: 9480 at kernel/locking/lockdep.c:202 hlock_class kernel/locking/lockdep.c:191 [inline] WARNING: CPU: 3 PID: 9480 at kernel/locking/lockdep.c:202 check_wait_context kernel/locking/lockdep.c:4574 [inline] WARNING: CPU: 3 PID: 9480 at kernel/locking/lockdep.c:202 __lock_acquire+0x165c/0x54c0 kernel/locking/lockdep.c:4851 Modules linked in: CPU: 3 PID: 9480 Comm: kworker/3:3 Not tainted 5.12.0-rc8-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 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:4574 [inline] RIP: 0010:__lock_acquire+0x165c/0x54c0 kernel/locking/lockdep.c:4851 Code: 08 84 d2 0f 85 01 3e 00 00 8b 0d 37 9c 6c 0c 85 c9 0f 85 d6 f9 ff ff 48 c7 c6 60 8b 6b 89 48 c7 c7 20 80 6b 89 e8 26 c8 69 07 <0f> 0b e9 bc f9 ff ff c7 44 24 60 fe ff ff ff 41 bf 01 00 00 00 c7 RSP: 0018:ffffc90003fd7908 EFLAGS: 00010086 RAX: 0000000000000000 RBX: ffff888016312b70 RCX: 0000000000000000 RDX: ffff888016312180 RSI: ffffffff815b8155 RDI: fffff520007faf13 RBP: ffff888016312c10 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff815b0ebe R11: 0000000000000000 R12: ffff888016312180 R13: 0000000000000bc5 R14: ffff8880132f10a0 R15: 0000000000040000 FS: 0000000000000000(0000) GS:ffff88802cd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055afb778c9e0 CR3: 0000000025d6a000 CR4: 0000000000150ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire kernel/locking/lockdep.c:5511 [inline] lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5476 __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: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+0x98d/0x1600 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294