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

Juri Lelli
2019-08-08T06:47:15Z

Hi,

On 07/08/19 16:07, Steven Rostedt wrote:
> On Mon, 5 Aug 2019 12:06:46 +0200
> Juri Lelli <juri.lelli@redhat.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?

Yeah. I did backport it to a downstream kernel and the splat is gone
(plus I couldn't spot any other problems my backport might have
introduced :).

> > 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).

Ok, thanks!

Best,

Juri