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Subject: Re: [OMPI users] Segmentation fault in oob_tcp.c of openmpi-1.7.4a1r29646
From: tmishima_at_[hidden]
Date: 2013-11-13 00:58:21


Hi Ralph,

Thank you for your quick response.

I'd like to report one more regressive issue about Torque support of
openmpi-1.7.4a1r29646, which might be related to "#3893: LAMA mapper
has problems" I reported a few days ago.

The script below does not work with openmpi-1.7.4a1r29646,
although it worked with openmpi-1.7.3 as I told you before.

#!/bin/sh
#PBS -l nodes=node08:ppn=8
export OMP_NUM_THREADS=1
cd $PBS_O_WORKDIR
cp $PBS_NODEFILE pbs_hosts
NPROCS=`wc -l < pbs_hosts`
mpirun -machinefile pbs_hosts -np ${NPROCS} -report-bindings -bind-to core
Myprog

If I drop "-machinefile pbs_hosts -np ${NPROCS} ", then it works fine.
Since this happens without lama request, I guess it's not the problem
in lama itself. Anyway, please look into this issue as well.

Regards,
Tetsuya Mishima

> Done - thanks!
>
> On Nov 12, 2013, at 7:35 PM, tmishima_at_[hidden] wrote:
>
> >
> >
> > Dear openmpi developers,
> >
> > I got a segmentation fault in traial use of openmpi-1.7.4a1r29646 built
by
> > PGI13.10 as shown below:
> >
> > [mishima_at_manage testbed-openmpi-1.7.3]$ mpirun -np 4 -cpus-per-proc 2
> > -report-bindings mPre
> > [manage.cluster:23082] MCW rank 2 bound to socket 0[core 4[hwt 0]],
socket
> > 0[core 5[hwt 0]]: [././././B/B][./././././.]
> > [manage.cluster:23082] MCW rank 3 bound to socket 1[core 6[hwt 0]],
socket
> > 1[core 7[hwt 0]]: [./././././.][B/B/./././.]
> > [manage.cluster:23082] MCW rank 0 bound to socket 0[core 0[hwt 0]],
socket
> > 0[core 1[hwt 0]]: [B/B/./././.][./././././.]
> > [manage.cluster:23082] MCW rank 1 bound to socket 0[core 2[hwt 0]],
socket
> > 0[core 3[hwt 0]]: [././B/B/./.][./././././.]
> > [manage:23082] *** Process received signal ***
> > [manage:23082] Signal: Segmentation fault (11)
> > [manage:23082] Signal code: Address not mapped (1)
> > [manage:23082] Failing at address: 0x34
> > [manage:23082] *** End of error message ***
> > Segmentation fault (core dumped)
> >
> > [mishima_at_manage testbed-openmpi-1.7.3]$ gdb mpirun core.23082
> > GNU gdb (GDB) CentOS (7.0.1-42.el5.centos.1)
> > Copyright (C) 2009 Free Software Foundation, Inc.
> > ...
> > Core was generated by `mpirun -np 4 -cpus-per-proc 2 -report-bindings
> > mPre'.
> > Program terminated with signal 11, Segmentation fault.
> > #0 0x00002b5f861c9c4f in recv_connect (mod=0x5f861ca20b00007f,
sd=32767,
> > hdr=0x1ca20b00007fff25) at ./oob_tcp.c:631
> > 631 peer = OBJ_NEW(mca_oob_tcp_peer_t);
> > (gdb) where
> > #0 0x00002b5f861c9c4f in recv_connect (mod=0x5f861ca20b00007f,
sd=32767,
> > hdr=0x1ca20b00007fff25) at ./oob_tcp.c:631
> > #1 0x00002b5f861ca20b in recv_handler (sd=1778385023, flags=32767,
> > cbdata=0x8eb06a00007fff25) at ./oob_tcp.c:760
> > #2 0x00002b5f848eb06a in event_process_active_single_queue
> > (base=0x5f848eb27000007f, activeq=0x848eb27000007fff)
> > at ./event.c:1366
> > #3 0x00002b5f848eb270 in event_process_active
(base=0x5f848eb84900007f)
> > at ./event.c:1435
> > #4 0x00002b5f848eb849 in opal_libevent2021_event_base_loop
> > (base=0x4077a000007f, flags=32767) at ./event.c:1645
> > #5 0x00000000004077a0 in orterun (argc=7, argv=0x7fff25bbd4a8)
> > at ./orterun.c:1030
> > #6 0x00000000004067fb in main (argc=7, argv=0x7fff25bbd4a8)
at ./main.c:13
> > (gdb) quit
> >
> >
> > The line 627 in orte/mca/oob/tcp/oob_tcp.c is apparently unnecessary,
which
> > causes the segfault.
> >
> > 624 /* lookup the corresponding process */
> > 625 peer = mca_oob_tcp_peer_lookup(mod, &hdr->origin);
> > 626 if (NULL == peer) {
> > 627 ui64 = (uint64_t*)(&peer->name);
> > 628 opal_output_verbose(OOB_TCP_DEBUG_CONNECT,
> > orte_oob_base_framework.framework_output,
> > 629 "%s mca_oob_tcp_recv_connect:
> > connection from new peer",
> > 630 ORTE_NAME_PRINT(ORTE_PROC_MY_NAME));
> > 631 peer = OBJ_NEW(mca_oob_tcp_peer_t);
> > 632 peer->mod = mod;
> > 633 peer->name = hdr->origin;
> > 634 peer->state = MCA_OOB_TCP_ACCEPTING;
> > 635 ui64 = (uint64_t*)(&peer->name);
> > 636 if (OPAL_SUCCESS != opal_hash_table_set_value_uint64
(&mod->
> > peers, (*ui64), peer)) {
> > 637 OBJ_RELEASE(peer);
> > 638 return;
> > 639 }
> >
> >
> > Please fix this mistake in the next release.
> >
> > Regards,
> > Tetsuya Mishima
> >
> > _______________________________________________
> > users mailing list
> > users_at_[hidden]
> > http://www.open-mpi.org/mailman/listinfo.cgi/users
>
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