linux-kernel - 4.19.106-rt44 -- boot problems with irqwork: push most work into softirq context

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Message-ID: <20200319232225.GA7878@duo.ucw.cz>
Date:   Fri, 20 Mar 2020 00:22:25 +0100
From:   Pavel Machek <pavel@...x.de>
To:     Steven Rostedt <rostedt@...dmis.org>,
        ben.hutchings@...ethink.co.uk, Chris.Paterson2@...esas.com,
        bigeasy@...utronix.de
Cc:     LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Carsten Emde <C.Emde@...dl.org>,
        John Kacur <jkacur@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Julia Cartwright <julia@...com>,
        Daniel Wagner <wagi@...om.org>,
        Tom Zanussi <zanussi@...nel.org>,
        "Srivatsa S. Bhat" <srivatsa@...il.mit.edu>
Subject: 4.19.106-rt44 -- boot problems with irqwork: push most work into
 softirq context


On Thu 2020-03-19 22:48:35, Pavel Machek wrote:
> Hi!
> 
> > I'm pleased to announce the 4.19.106-rt44 stable release.
> > 
> > 
> > This release is just an update to the new stable 4.19.106 version
> > and no RT specific changes have been made.
> > 
> > 
> > You can get this release via the git tree at:
> > 
> >   git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-stable-rt.git
> > 
> >   branch: v4.19-rt
> >   Head SHA1: 0f2960c75dd68d339f0aff2935f51652b5625fbf
> 
> This brought some problems for me. de0-nano board now fails to boot in
> cca 50% of cases if I move these patches on top of -cip tree.
> 
> This is example of failed job:
> 
> https://lava.ciplatform.org/scheduler/job/13037
> 
> de0-nano is 32-bit arm, should be based on Altera SoCFPGA if I understand
> things correctly.
> 
> "fc9f4631a290 irqwork: push most work into softirq context" touches
> area of the panic above. I tried to revert it on top of the full
> series, and tests passed twice so far...

Test passed 7 times now. So yes, reverting this fixes de0-nano
boot. Any ideas what might be wrong?

I'll be running it few more times.

https://gitlab.com/cip-project/cip-kernel/linux-cip/pipelines/127953471

Best regards,
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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