------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(1) WARNING: CPU: 1 PID: 663 at kernel/locking/lockdep.c:202 hlock_class kernel/locking/lockdep.c:202 [inline] WARNING: CPU: 1 PID: 663 at kernel/locking/lockdep.c:202 hlock_class kernel/locking/lockdep.c:191 [inline] WARNING: CPU: 1 PID: 663 at kernel/locking/lockdep.c:202 check_wait_context kernel/locking/lockdep.c:4574 [inline] WARNING: CPU: 1 PID: 663 at kernel/locking/lockdep.c:202 __lock_acquire+0x165c/0x54c0 kernel/locking/lockdep.c:4851 Modules linked in: CPU: 1 PID: 663 Comm: kworker/1:9 Not tainted 5.12.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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 77 07 6c 0c 85 c9 0f 85 d6 f9 ff ff 48 c7 c6 e0 a1 6b 89 48 c7 c7 a0 96 6b 89 e8 dd f1 68 07 <0f> 0b e9 bc f9 ff ff c7 44 24 60 fe ff ff ff 41 bf 01 00 00 00 c7 RSP: 0000:ffffc90002027908 EFLAGS: 00010086 RAX: 0000000000000000 RBX: ffff88801e5fa630 RCX: 0000000000000000 RDX: ffff88801e5f9c40 RSI: ffffffff815c4d25 RDI: fffff52000404f13 RBP: ffff88801e5fa6d0 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff815bdabe R11: 0000000000000000 R12: ffff88801e5f9c40 R13: 0000000000000f2f R14: ffff88807e9d10a0 R15: 0000000000040000 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000541198 CR3: 0000000020ba1000 CR4: 00000000001506e0 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