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Sender: Guenter Roeck <groeck7@gmail.com>
Date:   Wed, 12 Oct 2022 17:21:48 -0700
From:   Guenter Roeck <linux@roeck-us.net>
To:     Michael Ellerman <mpe@ellerman.id.au>
Cc:     "Jason A. Donenfeld" <Jason@zx2c4.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        ajd@linux.ibm.com, aneesh.kumar@linux.ibm.com,
        atrajeev@linux.vnet.ibm.com, christophe.leroy@csgroup.eu,
        cuigaosheng1@huawei.com, david@redhat.com, farosas@linux.ibm.com,
        geoff@infradead.org, gustavoars@kernel.org, haren@linux.ibm.com,
        hbathini@linux.ibm.com, joel@jms.id.au, lihuafei1@huawei.com,
        linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
        lukas.bulwahn@gmail.com, mikey@neuling.org, nathan@kernel.org,
        nathanl@linux.ibm.com, nicholas@linux.ibm.com, npiggin@gmail.com,
        pali@kernel.org, paul@paul-moore.com, rmclure@linux.ibm.com,
        ruscur@russell.cc, windhl@126.com,
        wsa+renesas@sang-engineering.com, ye.xingchen@zte.com.cn,
        yuanjilin@cdjrlc.com, zhengyongjun3@huawei.com
Subject: Re: [GIT PULL] Please pull powerpc/linux.git powerpc-6.1-1 tag
Message-ID: <20221013002148.GA535574@roeck-us.net>
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On Thu, Oct 13, 2022 at 11:03:34AM +1100, Michael Ellerman wrote:
> Guenter Roeck <linux@roeck-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

Guenter

> cheers
> 
> > ---
> > # bad: [1440f576022887004f719883acb094e7e0dd4944] Merge tag 'mm-hotfixes-stable-2022-10-11' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
> > # good: [4fe89d07dcc2804c8b562f6c7896a45643d34b2f] Linux 6.0
> > git bisect start 'HEAD' 'v6.0'
> > # good: [7171a8da00035e7913c3013ca5fb5beb5b8b22f0] Merge tag 'arm-dt-6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
> > git bisect good 7171a8da00035e7913c3013ca5fb5beb5b8b22f0
> > # good: [f01603979a4afaad7504a728918b678d572cda9e] Merge tag 'gpio-updates-for-v6.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux
> > git bisect good f01603979a4afaad7504a728918b678d572cda9e
> > # bad: [8aeab132e05fefc3a1a5277878629586bd7a3547] Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
> > git bisect bad 8aeab132e05fefc3a1a5277878629586bd7a3547
> > # bad: [493ffd6605b2d3d4dc7008ab927dba319f36671f] Merge tag 'ucount-rlimits-cleanups-for-v5.19' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
> > git bisect bad 493ffd6605b2d3d4dc7008ab927dba319f36671f
> > # good: [0e470763d84dcad27284067647dfb4b1a94dfce0] Merge tag 'efi-next-for-v6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi
> > git bisect good 0e470763d84dcad27284067647dfb4b1a94dfce0
> > # bad: [110a58b9f91c66f743c01a2c217243d94c899c23] powerpc/boot: Explicitly disable usage of SPE instructions
> > git bisect bad 110a58b9f91c66f743c01a2c217243d94c899c23
> > # good: [fdfdcfd504933ed06eb6b4c9df21eede0e213c3e] powerpc/build: put sys_call_table in .data.rel.ro if RELOCATABLE
> > git bisect good fdfdcfd504933ed06eb6b4c9df21eede0e213c3e
> > # good: [c2e7a19827eec443a7cbe85e8d959052412d6dc3] powerpc: Use generic fallocate compatibility syscall
> > git bisect good c2e7a19827eec443a7cbe85e8d959052412d6dc3
> > # good: [56adbb7a8b6cc7fc9b940829c38494e53c9e57d1] powerpc/64/interrupt: Fix false warning in context tracking due to idle state
> > git bisect good 56adbb7a8b6cc7fc9b940829c38494e53c9e57d1
> > # bad: [754f611774e4b9357a944f5b703dd291c85161cf] powerpc/64: switch asm helpers from GOT to TOC relative addressing
> > git bisect bad 754f611774e4b9357a944f5b703dd291c85161cf
> > # bad: [f7bff6e7759b1abb59334f6448f9ef3172c4c04a] powerpc/64/interrupt: avoid BUG/WARN recursion in interrupt entry
> > git bisect bad f7bff6e7759b1abb59334f6448f9ef3172c4c04a
> > # bad: [e485f6c751e0a969327336c635ca602feea117f0] powerpc/64/interrupt: Fix return to masked context after hard-mask irq becomes pending
> > git bisect bad e485f6c751e0a969327336c635ca602feea117f0
> > # good: [799f7063c7645f9a751d17f5dfd73b952f962cd2] powerpc/64: mark irqs hard disabled in boot paca
> > git bisect good 799f7063c7645f9a751d17f5dfd73b952f962cd2
> > # first bad commit: [e485f6c751e0a969327336c635ca602feea117f0] powerpc/64/interrupt: Fix return to masked context after hard-mask irq becomes pending