Hi, I encountered the same SEGV reported on the users list when running varList program.
http://www.open-mpi.org/community/lists/users/2014/07/24792.php mpiexec -n 1 ./varList: ---------------------------------------------------------------- ... snip ... event U/D-2 CHAR n/a ALL event_base_verbose D/D-8 INT n/a LOCAL 0 event_libevent2021_event_include U/A-3 CHAR n/a LOCAL poll opal_event_include U/A-3 CHAR n/a LOCAL poll event_libevent2021_major_version D/A-9 INT n/a UNKNOWN 1 event_libevent2021_minor_version D/A-9 INT n/a UNKNOWN 9 event_libevent2021_release_version D/A-9 INT n/a UNKNOWN 0 shmem U/D-2 CHAR n/a ALL shmem_base_verbose D/D-8 INT n/a LOCAL 0 shmem_base_RUNTIME_QUERY_hint D/A-9 CHAR n/a ALL-EQ shmem_mmap_priority U/A-3 INT n/a ALL 50 shmem_mmap_enable_nfs_warning D/A-9 INT n/a LOCAL true shmem_mmap_relocate_backing_file D/A-9 INT n/a ALL 0 shmem_mmap_backing_file_base_dir D/A-9 CHAR n/a ALL /dev/shm shmem_mmap_major_version D/A-9 INT n/a UNKNOWN 1 shmem_mmap_minor_version D/A-9 INT n/a UNKNOWN 9 shmem_mmap_release_version D/A-9 INT n/a UNKNOWN 0 shmem_posix_major_version D/A-9 INT n/a UNKNOWN 1201644720 shmem_posix_minor_version D/A-9 INT n/a UNKNOWN 32756 shmem_posix_release_version D/A-9 INT n/a UNKNOWN 6 [ppc:12688] *** Process received signal *** [ppc:12688] Signal: Segmentation fault (11) [ppc:12688] Signal code: Invalid permissions (2) [ppc:12688] Failing at address: 0x7ff4479f83d8 [ppc:12688] [ 0] /lib/x86_64-linux-gnu/libc.so.6(+0x325c0)[0x7ff4493015c0] [ppc:12688] [ 1] /home/rivis/opt/openmpi-trunk-debug/lib/libmpi.so.0(PMPI_T_cvar_read+0xbc)[0x7ff44970abb7] [ppc:12688] [ 2] ./varlist(list_cvars+0x56a)[0x4029bc] [ppc:12688] [ 3] ./varlist(main+0x42b)[0x403598] [ppc:12688] [ 4] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xfd)[0x7ff4492edeed] [ppc:12688] [ 5] ./varlist[0x4016c9] [ppc:12688] *** End of error message *** ---------------------------------------------------------------- I tracked this error and found that this seems related to DSO. The error occurs when accessing value->intval for the control variable shmem_sysv_major_version in MPI_T_cvar_read. https://svn.open-mpi.org/trac/ompi/browser/trunk/ompi/mpi/tool/cvar_read.c The 'value' was gotten by mca_base_var_get_value and it points mca_shmem_sysv_component.super.base_version.mca_component_major_version, which was dlclose'd in MPI_INIT for DSO. (component mmap is selected on my environment) Abnormal shmem_posix_{major,minor,relase}_version values in my output above are the same reason. SEGV occurs if the memory was returned to kernel, and abnormal values are printed if not yet. So this SEGV doesn't occur if I configure Open MPI with --disable-dlopen option. I think it's the reason why Nathan doesn't see this error. Regards, KAWASHIMA Takahiro
