linux-kernel - Re: [RT WARNING] DEBUG_LOCKS_WARN_ON(rt_mutex_owner(lock) != current) with fsfreeze (4.19.25-rt16)

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Message-ID: <20190501192525.GW7905@worktop.programming.kicks-ass.net>
Date:   Wed, 1 May 2019 21:25:25 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Davidlohr Bueso <dave@...olabs.net>
Cc:     Waiman Long <longman@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Clark Williams <williams@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Oleg Nesterov <oleg@...hat.com>, jack@...e.com
Subject: Re: [RT WARNING] DEBUG_LOCKS_WARN_ON(rt_mutex_owner(lock) !=
 current) with fsfreeze (4.19.25-rt16)

On Wed, May 01, 2019 at 12:22:34PM -0700, Davidlohr Bueso wrote:
> On Wed, 01 May 2019, Peter Zijlstra wrote:
> 
> > Nah, the percpu_rwsem abuse by the freezer is atrocious, we really
> > should not encourage that. Also, it completely wrecks -RT.
> > 
> > Hence the proposed patch.
> 
> Is this patch (and removing rcuwait) only intended for rt?

Seeing how we want to have -rt upstream, and how horrible that current
fixup is; I'm tempted to say that barring a better solution, we'd want
this upstream.