------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(1) WARNING: CPU: 0 PID: 11616 at kernel/locking/lockdep.c:200 hlock_class kernel/locking/lockdep.c:200 [inline] WARNING: CPU: 0 PID: 11616 at kernel/locking/lockdep.c:200 hlock_class kernel/locking/lockdep.c:189 [inline] WARNING: CPU: 0 PID: 11616 at kernel/locking/lockdep.c:200 check_wait_context kernel/locking/lockdep.c:4505 [inline] WARNING: CPU: 0 PID: 11616 at kernel/locking/lockdep.c:200 __lock_acquire+0x1649/0x5590 kernel/locking/lockdep.c:4781 Modules linked in: CPU: 0 PID: 11616 Comm: kworker/0:7 Not tainted 5.10.0-rc3-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:200 [inline] RIP: 0010:hlock_class kernel/locking/lockdep.c:189 [inline] RIP: 0010:check_wait_context kernel/locking/lockdep.c:4505 [inline] RIP: 0010:__lock_acquire+0x1649/0x5590 kernel/locking/lockdep.c:4781 Code: 08 84 d2 0f 85 17 30 00 00 8b 0d aa d3 96 0b 85 c9 0f 85 5f fa ff ff 48 c7 c6 e0 62 4b 89 48 c7 c7 80 5a 4b 89 e8 d1 7c 56 07 <0f> 0b e9 45 fa ff ff c7 44 24 48 fe ff ff ff 41 bf 01 00 00 00 c7 RSP: 0018:ffffc90007edf908 EFLAGS: 00010086 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000 RDX: ffff88801aa51a40 RSI: ffffffff8158e0c5 RDI: fffff52000fdbf13 RBP: ffff88801aa523f0 R08: 0000000000000001 R09: ffff8880b9e2005b R10: 0000000000000000 R11: 0000000000000001 R12: ffff88801aa51a40 R13: 0000000000001bdf R14: ffff88806314a0a0 R15: 0000000000040000 FS: 0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f04bf2fedb8 CR3: 000000004c60b000 CR4: 00000000001506f0 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