Re: [PATCH] lock/lockdep: Add missing graph_unlock in validate_chain

[Boqun Feng]

On Fri, Jan 05, 2024 at 12:46:36PM +0800, Xuewen Yan wrote:
[...]
> >
> > Are you hitting a real issue or this is found by code reading?
> 
> Indeed, we hit a real issue:
> One cpu did not call graph_unlock, as a result, caused a deadlock with
> other cpus,
> because any cpu calling raw_spin_lock would get the graph_lock first.
> 

Could you share more details about the real issue you hit? For example,
serial log? I asked because although the graph_unlock() makes logical
sense, but that path should really not hit if lockdep works correctly.
Thanks!

Regards,
Boqun

> Thanks!