Bug#671866: gmp: causes gcc ICEs on amd64 and kfreebsd-amd64

[Steve M. Robbins]

On Mon, May 07, 2012 at 11:54:18PM +0200, Julien Cristau wrote:
> On Mon, May  7, 2012 at 21:35:58 +0200, Laurent Fousse wrote:
> 
> > Hello,
> > 
> > * Julien Cristau [Mon, May 07, 2012 at 06:08:40PM +0200]:
> > > it looks like the update from gmp 2:5.0.4+dfsg-1 to 2:5.0.5+dfsg-1
> > > causes gcc to ICE on the buildds.
> > > See e.g.
> > > https://buildd.debian.org/status/fetch.php?pkg=ufraw&arch=amd64&ver=0.18-1.1%2Bb2&stamp=1336402119
> > 
> > It would be interesting to see if the bug goes away when mpfr is
> > rebuilt against the newest gmp package. 
> > 
> > I will look into it this evening, but feel free to beat me to it.
> > 
> I haven't tried that, won't get to it today.  However as a data point
> the crash seemed to (mostly? only?) affect VM guests, rather than
> physical hosts.

Matches my experience: I cannot reproduce the crash using reproducer.c
on my physical amd64.


> A local rebuild with --disable-fat seemed not to crash,
> but I haven't tried a clean rebuild without source change so I'm not
> sure if it's the rebuild or the configure option change that fixed
> things for me.

Interesting.  It could well be the configure option.  For the past 6
years, Debian built using --disable-fat on amd64.  I changed it
because there are both bug workarounds and code speedups that are
processor-based.  So it makes more sense for the code to detect the
processor at runtime.

On the other hand, I just looked at the source diff and there is a
change in configure.guess that changes the behaviour for a 64-bit
"vmkernel".  Could this be affecting your virtual machine?

@@ -1315,6 +1325,9 @@
     i*86:AROS:*:*)
        echo ${UNAME_MACHINE}-pc-aros
        exit ;;
+    x86_64:VMkernel:*:*)
+       echo ${UNAME_MACHINE}-unknown-esx
+       exit ;;


Dear gmp-bugs readers: any ideas? 

Thanks,
-Steve
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