linux-kernel - Re: [patch 0/2] locking/rtmutex: Cure two subtle bugs

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Message-ID: <YSYsKMlkEIpRBv34@hirez.programming.kicks-ass.net>
Date:   Wed, 25 Aug 2021 13:40:24 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Waiman Long <longman@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Davidlohr Bueso <dave@...olabs.net>
Subject: Re: [patch 0/2] locking/rtmutex: Cure two subtle bugs

On Wed, Aug 25, 2021 at 12:33:11PM +0200, Thomas Gleixner wrote:
> The recent updates to rtmutex introduced two subtle bugs:
> 
>   1) The spinwait mechanism added a UAF which triggers a BUG_ON()
> 
>   2) The ww_mutex addition leaves a waiter queued in the error exit path
>      resulting in rb tree corruption
> 
> The fixes are straight forward, but the rtmutex based ww_mutex
> implementation still has some more rough egdes which need to be ironed out.

Thanks!