linux-kernel - Re: [RT BUG] isolcpus causes sleeping function called from invalid context (4.19.59-rt24)

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Date:   Wed, 7 Aug 2019 16:07:25 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Juri Lelli <juri.lelli@...hat.com>
Cc:     linux-rt-users <linux-rt-users@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Clark Williams <williams@...hat.com>
Subject: Re: [RT BUG] isolcpus causes sleeping function called from invalid
 context (4.19.59-rt24)

On Mon, 5 Aug 2019 12:06:46 +0200
Juri Lelli <juri.lelli@...hat.com> wrote:

> This only happens if isolcpus are configured at boot.
> 
> AFAIU, RT is reworking workqueues and 5.x-rt shouldn't suffer from this.
> As a matter of fact, I could verify that backporting the workqueue
> rework all-in change from 5.0-rt [1] fixes this problem.

So you have backported this and it fixed the bug?

> 
> I'm thus wondering if there is any plan on backporting the rework to
> 4.19-rt stable, and if that patch has dependencies, or if any alternative
> fix might be found for this problem.

I could do it after I fix the bug with 4.19.63 merge :-/ (which may be
related. Who knows).

-- Steve