From: Pavel Machek <pavel@ucw.cz>
To: Ingo Molnar <mingo@kernel.org>,
arnd@arndb.de, akpm@linux-foundation.org, luto@kernel.org,
dave.hansen@linux.intel.com, jroedel@suse.de,
keescook@chromium.org, torvalds@linux-foundation.org,
toshi.kani@hpe.com
Cc: Thomas Gleixner <tglx@linutronix.de>,
sfr@canb.auug.org.au, kernel list <linux-kernel@vger.kernel.org>,
mingo@redhat.com, bp@alien8.de, hpa@zytor.com, x86@kernel.org
Subject: Avoid VLA in pgd_alloc kills boot on 32-bit machines was Re: -next20181010,1011 regression: thinkpad x60 (32 bit) dies during boot.
Date: Fri, 12 Oct 2018 20:10:11 +0200 [thread overview]
Message-ID: <20181012181011.GA9098@amd> (raw)
In-Reply-To: <20181012105254.GA114888@gmail.com>
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Hi!
> > > So what came in between -next20181005 and the first bad one? kernel/sched/*
> > > being the first place to look at.
> >
> > kernel/sched does not seem to contain anything too scary.
> >
> > I know that -next20181005 works ok, and I know -next20181010 is
> > bad. Is there easy way to bisect using that information? I can do
> > bisect between -next and mainline, but that's a lot of patches and
> > thus not much fun :-(.
> >
> > In the meantime, I reproduced the failure with T40p. Is there someone
> > with working x86-32 in -next?
>
> Does latest -tip fail too? If yes then I suspect bisection would be needed.
And the winner is...
[1be3f247c2882a82279cbcf43717581ea943b692] x86/mm: Avoid VLA in
pgd_alloc()
"Kernel stack is corrupted in: pgd_alloc" panic kind of suggests this
is right commit.
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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next prev parent reply other threads:[~2018-10-12 18:10 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-10 19:59 -next20181010 regression: thinkpad x60 (32 bit) dies during boot Pavel Machek
2018-10-10 20:03 ` Pavel Machek
2018-10-11 18:03 ` -next20181010,1011 " Pavel Machek
2018-10-11 20:09 ` Thomas Gleixner
2018-10-12 10:24 ` Pavel Machek
2018-10-12 10:52 ` Ingo Molnar
2018-10-12 12:35 ` Pavel Machek
2018-10-12 18:10 ` Pavel Machek [this message]
2018-10-12 18:13 ` Avoid VLA in pgd_alloc kills boot on 32-bit machines was " Borislav Petkov
2018-10-12 18:57 ` Pavel Machek
2018-10-12 18:22 ` Pavel Machek
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