------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(1) WARNING: CPU: 0 PID: 8177 at kernel/locking/lockdep.c:183 hlock_class kernel/locking/lockdep.c:183 [inline] WARNING: CPU: 0 PID: 8177 at kernel/locking/lockdep.c:183 hlock_class kernel/locking/lockdep.c:172 [inline] WARNING: CPU: 0 PID: 8177 at kernel/locking/lockdep.c:183 check_wait_context kernel/locking/lockdep.c:4100 [inline] WARNING: CPU: 0 PID: 8177 at kernel/locking/lockdep.c:183 __lock_acquire+0x155f/0x5570 kernel/locking/lockdep.c:4376 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 8177 Comm: kworker/0:4 Not tainted 5.9.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events l2cap_chan_timeout Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x198/0x1fd lib/dump_stack.c:118 panic+0x347/0x7c0 kernel/panic.c:231 __warn.cold+0x20/0x46 kernel/panic.c:600 report_bug+0x1bd/0x210 lib/bug.c:198 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:234 exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:254 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536 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:4100 [inline] RIP: 0010:__lock_acquire+0x155f/0x5570 kernel/locking/lockdep.c:4376 Code: d2 0f 85 62 2f 00 00 44 8b 15 d5 e3 58 09 45 85 d2 0f 85 da fa ff ff 48 c7 c6 60 ad 4b 88 48 c7 c7 20 a8 4b 88 e8 f3 36 eb ff <0f> 0b e9 c0 fa ff ff e8 35 f0 9b 06 85 c0 0f 84 fd fa ff ff 48 c7 RSP: 0018:ffffc90015b878e8 EFLAGS: 00010082 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000000000 RDX: ffff888092b9e500 RSI: ffffffff815dbd97 RDI: fffff52002b70f0f RBP: ffff888092b9eea8 R08: 0000000000000000 R09: ffffffff89bcb4e3 R10: 00000000000008b0 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000001367 R14: ffff888092b9e500 R15: 0000000000040000 lock_acquire+0x1f3/0xae0 kernel/locking/lockdep.c:5006 __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+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Kernel Offset: disabled Rebooting in 86400 seconds..