linux-kernel - Re: [GIT PULL] Please pull powerpc/linux.git powerpc-6.1-1 tag

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Message-ID: <Y0ef1SuIpFZxNCcJ@zx2c4.com>
Date:   Thu, 13 Oct 2022 07:19:17 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Nicholas Piggin <npiggin@...il.com>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        Michael Ellerman <mpe@...erman.id.au>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        ajd@...ux.ibm.com, aneesh.kumar@...ux.ibm.com,
        atrajeev@...ux.vnet.ibm.com, christophe.leroy@...roup.eu,
        cuigaosheng1@...wei.com, david@...hat.com, farosas@...ux.ibm.com,
        geoff@...radead.org, gustavoars@...nel.org, haren@...ux.ibm.com,
        hbathini@...ux.ibm.com, joel@....id.au, lihuafei1@...wei.com,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        lukas.bulwahn@...il.com, mikey@...ling.org, nathan@...nel.org,
        nathanl@...ux.ibm.com, nicholas@...ux.ibm.com, pali@...nel.org,
        paul@...l-moore.com, rmclure@...ux.ibm.com, ruscur@...sell.cc,
        windhl@....com, wsa+renesas@...g-engineering.com,
        ye.xingchen@....com.cn, yuanjilin@...rlc.com,
        zhengyongjun3@...wei.com
Subject: Re: [GIT PULL] Please pull powerpc/linux.git powerpc-6.1-1 tag

On Thu, Oct 13, 2022 at 03:03:14PM +1000, Nicholas Piggin wrote:
> On Thu Oct 13, 2022 at 10:21 AM AEST, Guenter Roeck wrote:
> > On Thu, Oct 13, 2022 at 11:03:34AM +1100, Michael Ellerman wrote:
> > > Guenter Roeck <linux@...ck-us.net> writes:
> > > > On Wed, Oct 12, 2022 at 11:20:38AM -0600, Jason A. Donenfeld wrote:
> > > >> 
> > > >> I've also managed to not hit this bug a few times. When it triggers,
> > > >> after "kprobes: kprobe jump-optimization is enabled. All kprobes are
> > > >> optimized if possible.", there's a long hang - tens seconds before it
> > > >> continues. When it doesn't trigger, there's no hang at that point in the
> > > >> boot process.
> > > >> 
> > > >
> > > > I managed to bisect the problem. See below for results. Reverting the
> > > > offending patch fixes the problem for me.
> > > 
> > > Thanks.
> > > 
> > > This is probably down to me/us not testing with PREEMPT enabled enough.
> > > 
> > Not sure. My configuration has
> >
> > CONFIG_PREEMPT_NONE=y
> > # CONFIG_PREEMPT_VOLUNTARY is not set
> > # CONFIG_PREEMPT is not set
> 
> Thanks very much for helping with this. The config snippet you posted here
> https://lists.ozlabs.org/pipermail/linuxppc-dev/2022-October/249758.html
> has CONFIG_PREEMPT=y. How do you turn that into a .config, olddefconfig?
> 
> I can't reproduce this so far using your config and qemu command line,
> but the patch you've bisected it to definitely could cause this. I'll
> keep trying...

Voila https://xn--4db.cc/dt00j0mt this repros it for me.

> 
> Thanks,
> Nick
> 
> [...]
> > > > # first bad commit: [e485f6c751e0a969327336c635ca602feea117f0] powerpc/64/interrupt: Fix return to masked context after hard-mask irq becomes pending
>