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

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Message-Id: <CNKJKV3GCTGF.18JF410CFEKR3@bobo>
Date:   Thu, 13 Oct 2022 15:22:05 +1000
From:   "Nicholas Piggin" <npiggin@...il.com>
To:     "Guenter Roeck" <linux@...ck-us.net>,
        "Michael Ellerman" <mpe@...erman.id.au>
Cc:     "Jason A. Donenfeld" <Jason@...c4.com>,
        "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 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

Okay I reproduced it, just takes a while to hit.

Thanks,
Nick