linux-kernel - Re: [x86] BUG: unable to handle kernel paging request at 00740060

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Message-ID: <CA+55aFzUWkBWnoLh3rYSoQmeCrRvJDTV0jLHpkGKEGixxgD8Rw@mail.gmail.com>
Date:	Wed, 9 Oct 2013 11:54:04 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Jakub Jelinek <jakub@...hat.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Ingo Molnar <mingo@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Richard Henderson <rth@...ddle.net>
Subject: Re: [x86] BUG: unable to handle kernel paging request at 00740060

On Wed, Oct 9, 2013 at 11:16 AM, Jakub Jelinek <jakub@...hat.com> wrote:
>
> Confirmed as gcc bug, filed http://gcc.gnu.org/PR58670
> Seems all of 4.[6-9] miscompile it.  Will have a look tomorrow
> unless somebody beats me to it.  But historically, the case where
> asm goto labels jump to fallthru basic block had numerous problems in the
> past.

Ok, so it isn't even specific for x86-32, because your test-case shows
the bug for me on 64-bit too. Apparently we just have a harder time
hitting it in practice in the kernel on x86-64./

Too bad. It makes me nervous about all our _traditional_ uses of asm
goto too, never mind the new ones..

              Linus
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