Markus, I ran "set follow-fork-mode child" on another terminal while I was connecting to the compute node. Please see the output of the gdb $ gdb --args /share/apps/siesta/openmpi-2.0.0/bin/mpirun -hostfile hosts.txt -np 15 sc.sh Reading symbols from /share/apps/siesta/openmpi-2.0.0/bin/mpirun...done. (gdb) run Starting program: /share/apps/siesta/openmpi-2.0.0/bin/mpirun -hostfile hosts.txt -np 15 sc.sh [Thread debugging using libthread_db enabled] [New Thread 0x2aaaaafcc700 (LWP 26346)] [New Thread 0x2aaaab1cd700 (LWP 26347)] [New Thread 0x2aaaab3ce700 (LWP 26348)] [New Thread 0x2aaaab5cf700 (LWP 26349)] Detaching after fork from child process 26350. ... ... -------------------------------------------------------------------------- mpirun noticed that process rank 0 with PID 16401 on node compute-0-1 exited on signal 4 (Illegal instruction). -------------------------------------------------------------------------- [Thread 0x2aaaab5cf700 (LWP 26349) exited] [Thread 0x2aaaab3ce700 (LWP 26348) exited] [Thread 0x2aaaab1cd700 (LWP 26347) exited] [Thread 0x2aaaaafcc700 (LWP 26346) exited] Program exited with code 0204. Missing separate debuginfos, use: debuginfo-install glibc-2.12-1.80.el6_3.6.x86_64 libibverbs-1.1.8-4.el6.x86_64 libnl-1.1-14.el6.x86_64 libudev-147-2.42.el6.x86_64 (gdb) disas No frame selected. (gdb) This time the output has some more lines, so I think the "follow-fork-module" worked. But still the process is dead! Regards, Mahmood
