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

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Message-ID: <20220721071656.GA8109@ubuntu>
Date:   Thu, 21 Jul 2022 00:17:08 -0700
From:   "yuxin.ye" <yeyuxin0925@...il.com>
To:     Waiman Long <longman@...hat.com>, linux-rt-users@...r.kernel.org,
        peterz@...radead.org, mingo@...hat.com, will@...nel.org,
        boqun.feng@...il.com
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC] rtmutex: Fix BUG_ON at kernel/locking/rtmutex.c:1331!

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.