Ew. Yes, I can see this being a problem.
I'm guessing that the real issue is that OMPI embeds the libltdl from
LT 2.2.6a inside libopen_pal (one of the internal OMPI libraries).
Waving my hands a bit, but it's not hard to imagine some sort of clash
is going on between the -lltdl you added to the command line and the
libltdl that is embedded in OMPI's libraries.
Can you verify that this is what is happening?
If it is, I wonder if we should petition the LT authors to give us a
configure option to prefix all the symbols in libltdl so that we don't
get clashes like this -- similar to what we do with libevent and PLPA
(both of which are also embedded in Open MPI's internal libraries).
On Jan 23, 2009, at 9:04 AM, Roy Dragseth wrote:
Hi, all.
I do not know if this is to be considered a real bug or not, I'm just
reporting it here so people can find it if they google around for
the error
message this produces. There is a backtrace at the end of this mail.
Problem description:
Openmpi 1.3 seems to be nonfunctional when used with libltdl in
libtool v1.5
that is installed on CentOS (aka RH EL) 4 and 5. Upgrading to
libtool
v2.2.6a (and maybe earlier versions) solves the problem. We saw
this problem
with both gcc and icc.
Here is a code snippet that is extracted from the real application.
nestcrash.c:
#include <mpi.h>
#include <ltdl.h>
int main(int argc,char *argv[])
{
MPI_Init(&argc,&argv);
char *dummy="dummy";
const lt_dlhandle hModule = lt_dlopenext(dummy);
}
This will crash in MPI_Init when using libtool 1.5.X, if you comment
out
lt_dlopenext it will run normally.
I can provide a complete example if neccessary.
As I said earlier, upgrading to libtool 2.2.6a solved the problem
for us.
Here is the backtrace:
*** Process received signal ***
Signal: Segmentation fault (11)
Signal code: (128)
Failing at address: (nil)
[ 0] /lib64/tls/libpthread.so.0 [0x3ffce0c4f0]
[ 1] /global/apps/openmpi/1.3rc2/lib/libopen-pal.so.0 [0x2a95d4bce5]
[ 2] /global/apps/openmpi/1.3rc2/lib/libopen-pal.so.0(lt_dlopenadvise
+0xf0) [0x2a95d4b470]
[ 3] /global/apps/openmpi/1.3rc2/lib/libopen-pal.so.0 [0x2a95d56e1f]
[ 4] /global/apps/openmpi/1.3rc2/lib/libopen-
pal.so.0(mca_base_component_find+0x58d) [0x2a95d5657d]
[ 5] /global/apps/openmpi/1.3rc2/lib/libopen-
pal.so.0(mca_base_components_open+0x1ae) [0x2a95d581be]
[ 6] /global/apps/openmpi/1.3rc2/lib/libopen-
pal.so.0(opal_paffinity_base_open+0xad) [0x2a95d73ddd]
[ 7] /global/apps/openmpi/1.3rc2/lib/libopen-pal.so.0(opal_init+0x64)
[0x2a95d43e64]
[ 8] /global/apps/openmpi/1.3rc2/lib/libopen-rte.so.0(orte_init+0x1e)
[0x2a95bdeb8e]
[ 9] /global/apps/openmpi/1.3rc2/lib/libmpi.so.0 [0x2a95a38fee]
[10] /global/apps/openmpi/1.3rc2/lib/libmpi.so.0(PMPI_Init_thread
+0x72)
[0x2a95a5b9c2]
[11] nest-ompi_1.3rc2/bin/nest(_ZN4nest12Communicator4initEPiPPPc
+0x11f)
[0x55440f]
[12] nest-ompi_1.3rc2/bin/nest(main+0x74) [0x4a7674]
[13] /lib64/tls/libc.so.6(__libc_start_main+0xdb) [0x339271c3fb]
[14] nest-ompi_1.3rc2/bin/nest(_ZNSt8ios_base4InitD1Ev+0x5a)
[0x4a756a]
*** End of error message ***
--
The Computer Center, University of Tromsø, N-9037 TROMSØ Norway.
phone:+47 77 64 41 07, fax:+47 77 64 41 00
Roy Dragseth, Team Leader, High Performance Computing
Direct call: +47 77 64 62 56. email: roy.drags...@uit.no
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Jeff Squyres
Cisco Systems
