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Donenfeld" , david@redhat.com, linux-kernel@vger.kernel.org, wsa+renesas@sang-engineering.com, nicholas@linux.ibm.com, windhl@126.com, cuigaosheng1@huawei.com, mikey@neuling.org, paul@paul-moore.com, aneesh.kumar@linux.ibm.com, haren@linux.ibm.com, joel@jms.id.au, lukas.bulwahn@gmail.com, nathanl@linux.ibm.com, ajd@linux.ibm.com, ye.xingchen@zte.com.cn, nathan@kernel.org, rmclure@linux.ibm.com, hbathini@linux.ibm.com, atrajeev@linux.vnet.ibm.com, yuanjilin@cdjrlc.com, pali@kernel.org, farosas@linux.ibm.com, geoff@infradead.org, Linus Torvalds , gustavoars@kernel.org, lihuafei1@huawei.com, zhengyongjun3@huawei.com, linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" 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 writes: > > > On Wed, Oct 12, 2022 at 11:20:38AM -0600, Jason A. Donenfeld wrote: > > >>=20 > > >> 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 i= t > > >> continues. When it doesn't trigger, there's no hang at that point in= the > > >> boot process. > > >>=20 > > > > > > I managed to bisect the problem. See below for results. Reverting the > > > offending patch fixes the problem for me. > >=20 > > Thanks. > >=20 > > This is probably down to me/us not testing with PREEMPT enabled enough. > >=20 > Not sure. My configuration has > > CONFIG_PREEMPT_NONE=3Dy > # CONFIG_PREEMPT_VOLUNTARY is not set > # CONFIG_PREEMPT is not set Okay I reproduced it, just takes a while to hit. Thanks, Nick