Re: frequent lockups in 3.18rc4

From: Linus Torvalds
Date: Mon Nov 17 2014 - 14:59:39 EST

On Mon, Nov 17, 2014 at 9:03 AM, Dave Jones <davej@xxxxxxxxxx> wrote:
> It could a completely different cause for lockup, but seeing this now
> has me wondering if perhaps it's something unrelated to the kernel.
> I have recollection of running late .17rc's for days without incident,
> and I'm pretty sure .17 was ok too. But a few weeks ago I did upgrade
> that test box to the Fedora 21 beta. Which means I have a new gcc.
> I'm not sure I really trust 4.9.1 yet, so maybe I'll see if I can
> get 4.8 back on there and see if that's any better.

I'm not sure if I should be relieved or horrified.

Horrified, I think.

It really would be a wonderful thing to have some kind of "compiler
bisection" with mixed object files to see exactly which file it
miscompiles (and by "miscompiles" it might just be a kernel bug where
we are missing a barrier or something, and older gcc's just happened
to not show it - so it could still easily be a kernel problem).

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