linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <CA+55aFwLH6zGf7O=o2+H0Z8=8nW4zwUbw3Q4bJGttHACv9g+FQ@mail.gmail.com>
Date:	Sat, 15 Nov 2014 22:33:19 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Dave Jones <davej@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	"the arch/x86 maintainers" <x86@...nel.org>
Subject: Re: frequent lockups in 3.18rc4

On Sat, Nov 15, 2014 at 5:40 PM, Dave Jones <davej@...hat.com> wrote:
>  >
>  > I'll try that next, and check in on it tomorrow.
>
> No luck. Died even faster this time.

Yeah, and your other lockups haven't even been TLB related. Not that
they look like anything else *either*.

I have no ideas left. I'd go for a bisection - rather than try random
things, at least bisection will get us a smaller set of suspects if
you can go through a few cycles of it. Even if you decide that you
want to run for most of a day before you are convinced it's all good,
a couple of days should get you a handful of bisection points (that's
assuming you hit a couple of bad ones too that turn bad in a shorter
while). And 4 or five bisections should get us from 11k commits down
to the ~600 commit range. That would be a huge improvement.

                   Linus
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