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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
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