linux-kernel - Re: frequent lockups in 3.18rc4

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CA+55aFy9dWtS5qh=-HT9M7hQPeWDMvdxEynr0p4aRkiGkV6gyQ@mail.gmail.com>
Date:	Mon, 17 Nov 2014 11:59:34 -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 Mon, Nov 17, 2014 at 9:03 AM, Dave Jones <davej@...hat.com> 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).

                  Linus
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/