[gradsusr] GrAds 2.0a7 and beyond - floating point exception

Wed Feb 16 20:17:08 EST 2011

Ron,

 Sometimes this floating point error means an incompatible version of libc.
 What is the result of

% ldd --version

You should have at least GNU libc 2.5; anything earlier will not work.

    Arlindo

On Wed, Feb 16, 2011 at 2:47 PM, Goodson,Ron [Edm] <Ron.Goodson at ec.gc.ca>wrote:

>  Hi Jennifer
>
> Thanks for the reply.
>
> I'm using i686 versions.
>
> On the RedHat System....
>
> The 2.0.a5 ldd only had 5 entries,
>
> libX11.so.6
> libm.so.6
> libc.so.6
> libdl.so.2
> ld-linux.so.2.
>
> All of these exist on my system
>
> The 2.0.a7 version was ... ouch...
>
>  ldd  grads
>
> /usr/bin/ldd line 124: 32206 Floating point exception
> LD_TRACE_LOADED_OBJECTS=1 LD_WARN= LD_BIND_NOW=
> LD_LIBRARY_VERSION=$verify_out LD_VERBOSE="$@"
>
> On the Debain System.
>
> ldd for both 2.0a5 and 2.0a7 gave the same results
>
> linux-gate.so.1
> libX11.so.6
> libm.so.6
> libc.so.6
> libXau.so.6
> libXdmcp.so.6
> libdl.so.2
> ld-linux.so.2
>
> All of these exist on my system.  The libXau.so.6 and libXdmcp exist only
> on my Debian system.  I see via google that  "linux-gate.so.1" is not a real
> file so I ignore that (but surprised I don't see it on the RedHat side ..
> perhaps too ancient).
>
> But, given that ldd reports the same libraries for a5 and a7 on the Debian
> system .. and one runs and the other gets the floating poing exception ..
> I'm now at a bit of a loss.  Oh well, perhaps building from source it is..
> too bad.
>
>
>
> *Ron Goodson*
> Prairie and Northern Meteorological Service of Canada Science Section   Unité
> des Sciences, Région des Prairies et du Nord, Service Météorologique du
> Canada
> Environment Canada
>
> Room 200 ; 4999 – 98 Avenue
>
> Edmonton Alberta T6B 2X3        Environnement Canada
>
> Pièce 200 ; 4999 – 98 Avenue
>
> Edmonton Alberta T6B 2X3
> Telephone | Téléphone   780 951 8791
> Email | Courriel        ron.goodson at ec.gc.ca
>
>
>  ------------------------------
> *From:* gradsusr-bounces at gradsusr.org [mailto:
> gradsusr-bounces at gradsusr.org] *On Behalf Of *Jennifer Adams
> *Sent:* February 16, 2011 11:57 AM
> *To:* GrADS Users Forum
> *Subject:* Re: [gradsusr] GrAds 2.0a7 and beyond - floating point
> exception
>
> Hi, Ron --
> The 'floating point exception' usually means the architecture of the
> executable is incompatible with the OS. Our binary releases are not 100%
> statically linked, there are some shared dependencies. From your message,
> it's not clear which binary release you're using -- CentOS (previously known
> as RHEL) 4 or 5 (the two 64-bit builds) or i686 (the 32-bit build). Try
> using the 'ldd' command print out shared library dependencies and see if
> those libs exist on your system, and you can compare the ldd ouptut from
> 2.0.a5 and later builds. For example, the latest CentOS5 build has this:
>
>  > ldd /usr/local/grads/2.0/2.0.a9.release/grads
>         libX11.so.6 => /usr/lib64/libX11.so.6 (0x0000003edf000000)
>         libpthread.so.0 => /lib64/libpthread.so.0 (0x0000003ede800000)
>         libdl.so.2 => /lib64/libdl.so.2 (0x0000003ede400000)
>         librt.so.1 => /lib64/librt.so.1 (0x0000003ee2400000)
>         libm.so.6 => /lib64/libm.so.6 (0x0000003ede000000)
>         libstdc++.so.6 => /usr/lib64/libstdc++.so.6 (0x0000003ee4000000)
>         libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x0000003ee2c00000)
>         libc.so.6 => /lib64/libc.so.6 (0x0000003eddc00000)
>         libXau.so.6 => /usr/lib64/libXau.so.6 (0x0000003edf400000)
>         libXdmcp.so.6 => /usr/lib64/libXdmcp.so.6 (0x0000003edf800000)
>         /lib64/ld-linux-x86-64.so.2 (0x0000003edd800000)
>
>
> If your unix flavor is not quite the same as the OS on which the binary was
> originally compiled/linked, then you may have to rebuild from source. It's
> hard to say what what may have changed between a5 and a6 -- maybe our OS was
> upgraded during that time.
>
> Here's the current uname -a output from our CentOS 4 and 5 boxes:
>
>  # uname -a
> Linux <host> 2.6.9-89.0.16.ELsmp #1 SMP Tue Nov 3 17:43:09 EST 2009 x86_64
> x86_64 x86_64 GNU/Linux
>   # uname -a
> Linux <host> 2.6.18-194.17.1.el5 #1 SMP Wed Sep 29 12:50:31 EDT 2010 x86_64
> x86_64 x86_64 GNU/Linux
>
> --Jennifer
>
>
>  On Feb 16, 2011, at 1:31 PM, Goodson,Ron [Edm] wrote:
>
>  Hi to the brain trust (Jennifer et al.).  Because my problem is so vague
> - I'm not necessarily expecting an answer but thought I'd give it a shot.
>
> Using either an older RedHat WS4 installation running kernel 2.6.9-11, or a
> newer Debian etch (2.6.18-6) I have been able to use all version of grads up
> to and including 2.0.a5.  However, all versions beyond that result in a
> "floating point exception" immediately after invoking grads.
>
> I am thinking there is some underlying library mis-match.  Just wondering
> if anyone could throw me a bone as to what might have changed between a5 and
> a7 (in terms of what they expect from the operating-system libraries) so
> that I can have a starting point to fixing this.
>
> Thanks for any help - but - since I haven't seen any one else mention this,
> I'm not expecting much.
>
> ron goodson
> environment canda
>
>
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>
>  --
> Jennifer M. Adams
> IGES/COLA
> 4041 Powder Mill Road, Suite 302
> Calverton, MD 20705
> jma at cola.iges.org
>
>
>
>
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>
>

-- 
Arlindo da Silva
dasilva at alum.mit.edu
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