Re: [PATCH RFC] rtmutex: Fix BUG_ON at kernel/locking/rtmutex.c:1331!

[yuxin.ye]

On Wed, Jul 20, 2022 at 10:25:17PM -0400, Waiman Long wrote:
> On 7/20/22 03:28, yuxin.ye wrote:
> > before rt_mutex_adjust_prio_chain(),unlock lock->wait_lock will cause
> > BUG_ON at kernel/locking/rtmutex.c:1331:
> 
> The current upstream kernel/locking/rtmutex.c has no BUG_ON() call. Which
> version of the kernel are you using?
> 
> Cheers,
> Longman
> 

The Linux version is 5.10.
The upstream has indeed removed the BUG_ON, But in rt_mutex_adjust_prio_chain()
it is still possible to have a thread is blocked by two locks. Can this situation
be ignored without BUG_ON?

Thanks.