linux-kernel - Re: fyi: gcc33-hammer crashes when compiling kvm emulate.c

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Message-ID: <4CC70333.80400@zytor.com>
Date:	Tue, 26 Oct 2010 09:34:59 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	linux-kvm@...r.kernel.org, avi@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: fyi: gcc33-hammer crashes when compiling kvm emulate.c

On 10/26/2010 05:38 AM, Andi Kleen wrote:
> Hi,
> 
> While doing a test run with the minimum supported compiler
> I found:
> 
> An old gcc 3.3-hammer segfaults when compiling the current KVM
> emulate.c (or rather in x86_emulate_insns) on x86-64.
> 
> The compiler goes into an endless recursion in validate_rtx and then
> eventually overflows the stack and dies.
> 
> I minimized a test case, but didn't find a workaround
> (minimized test case http://halobates.de/emulate-min.i)
> 
> My guess it's related to some of the inline assembler uses.
> 
> This might be an excuse to bump the minimum compiler version again.
> 

We have said 3.4 minimum for x86 for a long time now, and have an RFC
out to bump to 4.1.  Unfortunately there isn't a good repo of
arch-specific version requirements in the kernel source code; in fact, I
just talked to Tony Luck yesterday about the need for that.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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