------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(1) WARNING: CPU: 0 PID: 10714 at kernel/locking/lockdep.c:183 hlock_class kernel/locking/lockdep.c:183 [inline] WARNING: CPU: 0 PID: 10714 at kernel/locking/lockdep.c:183 hlock_class kernel/locking/lockdep.c:172 [inline] WARNING: CPU: 0 PID: 10714 at kernel/locking/lockdep.c:183 check_wait_context kernel/locking/lockdep.c:4470 [inline] WARNING: CPU: 0 PID: 10714 at kernel/locking/lockdep.c:183 __lock_acquire+0x161b/0x55d0 kernel/locking/lockdep.c:4746 Modules linked in: CPU: 0 PID: 10714 Comm: kworker/0:14 Not tainted 5.9.0-rc4-next-20200911-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:183 [inline] RIP: 0010:hlock_class kernel/locking/lockdep.c:172 [inline] RIP: 0010:check_wait_context kernel/locking/lockdep.c:4470 [inline] RIP: 0010:__lock_acquire+0x161b/0x55d0 kernel/locking/lockdep.c:4746 Code: 08 84 d2 0f 85 81 30 00 00 8b 0d 58 e2 8c 09 85 c9 0f 85 79 fa ff ff 48 c7 c6 c0 b6 6b 88 48 c7 c7 80 b1 6b 88 e8 ba c0 7f 06 <0f> 0b e9 5f fa ff ff c7 44 24 48 fe ff ff ff 41 bf 01 00 00 00 c7 RSP: 0018:ffffc900018d7900 EFLAGS: 00010082 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000 RDX: ffff888091356440 RSI: ffffffff815c0ec7 RDI: fffff5200031af12 RBP: ffff888091356df0 R08: 0000000000000001 R09: ffff8880ae620f8b R10: 0000000000000000 R11: 0000000000000001 R12: ffff888091356440 R13: 00000000000013c0 R14: ffff8880620910a0 R15: 0000000000040000 FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c000709000 CR3: 000000006ed38000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1f2/0xaa0 kernel/locking/lockdep.c:5398 __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:3034 l2cap_sock_teardown_cb+0x88/0x400 net/bluetooth/l2cap_sock.c:1520 l2cap_chan_del+0xad/0x1300 net/bluetooth/l2cap_core.c:618 l2cap_chan_close+0x118/0xb10 net/bluetooth/l2cap_core.c:823 l2cap_chan_timeout+0x173/0x450 net/bluetooth/l2cap_core.c:436 process_one_work+0x933/0x15a0 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3af/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296