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

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Message-ID: <20101026123828.GA30434@basil.fritz.box>
Date:	Tue, 26 Oct 2010 14:38:28 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	linux-kvm@...r.kernel.org, avi@...hat.com, hpa@...or.com
Cc:	linux-kernel@...r.kernel.org
Subject: fyi: gcc33-hammer crashes when compiling kvm emulate.c

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.

-andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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