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From: Adrian Knoth (adi_at_[hidden])
Date: 2007-08-13 16:28:29


On Thu, Aug 02, 2007 at 10:51:13AM +0200, Adrian Knoth wrote:

> > We (as in the Debian maintainer for Open MPI) got this bug report from
> > Uwe who sees mpi apps segfault on Debian systems with the FreeBSD
> > kernel.
> > Any input would be greatly appreciated!
> I'll follow the QEMU instructions on your website and investigate on
> my own ;)

I was able to get OMPI running on kfreebsd-amd64. I used a nightly
snapshot from the trunk, so the problem is "more or less fixed by
upstream" ;)

adi_at_debian:~$ ./ompi/bin/mpirun -np 2 ring
0: sending message (0) to 1
0: sent message
1: waiting for message
1: got message (1) from 0, sending to 0
0: got message (1) from 1

adi_at_debian:~$ ./ompi/bin/ompi_info
                Open MPI: 1.3a1r15820
   Open MPI SVN revision: r15820
                Open RTE: 1.3a1r15820
   Open RTE SVN revision: r15820
                    OPAL: 1.3a1r15820
       OPAL SVN revision: r15820
                  Prefix: /home/adi/ompi
 Configured architecture: x86_64-unknown-kfreebsd6.2-gnu

I'll now compile the 1.2.3 release tarball and see if I can reproduce
the segfaults. On the other hand, I guess nobody is using OMPI on
GNU/kFreeBSD, so upgrading the openmpi-package to a subversion snapshot
would also fix the problem (think of "fixed in experimental").

JFTR: It's currently not possible to compile OMPI on amd64 (out of the
box). Though it compiles on i386

   http://experimental.debian.net/fetch.php?&pkg=openmpi&ver=1.2.3-3&arch=kfreebsd-i386&stamp=1187000200&file=log&as=raw

it fails on amd64:

   http://experimental.debian.net/fetch.php?&pkg=openmpi&ver=1.2.3-3&arch=kfreebsd-amd64&stamp=1186969782&file=log&as=raw

stacktrace.c: In function 'opal_show_stackframe':
stacktrace.c:145: error: 'FPE_FLTDIV' undeclared (first use in this
function)
stacktrace.c:145: error: (Each undeclared identifier is reported only
once
stacktrace.c:145: error: for each function it appears in.)
stacktrace.c:146: error: 'FPE_FLTOVF' undeclared (first use in this
function)
stacktrace.c:147: error: 'FPE_FLTUND' undeclared (first use in this
function)
make[4]: *** [stacktrace.lo] Error 1
make[4]: Leaving directory `/build/buildd/openmpi-1.2.3/opal/util'

This is caused by libc0.1-dev in /usr/include/bits/sigcontext.h, the
relevant #define's are placed in an #ifdef __i386__ condition. After
extending this for __x86_64__, everything works fine.

Should I file a bugreport against libc0.1-dev or will you take care?

I'll keep you posted...

-- 
Cluster and Metacomputing Working Group
Friedrich-Schiller-Universität Jena, Germany
private: http://adi.thur.de