ompi_info_get_bool returns "success" if the value isn't found, setting "flag" to false, but doesn't set the value of the param itself. So if you don't specify "blocking_fence" in MPI_Info, then the "blocking_fence" flag wasn't being set.

Initialize the blocking_fence flag to false as the code logic indicates that it should only be set if someone provides that flag.

Thanks to Lisandro Dalcin for reporting it

cmr=v1.8.4:reviewer=hjelmn

This commit was SVN r32812.

ompi/mca/osc/sm/osc_sm_component.c

@@ -323,7 +323,7 @@ component_select(struct ompi_win_t *win, void **base, size_t size, int disp_unit
 #if HAVE_PTHREAD_CONDATTR_SETPSHARED && HAVE_PTHREAD_MUTEXATTR_SETPSHARED
         pthread_mutexattr_t mattr;
         pthread_condattr_t cattr;
-        bool blocking_fence;
+        bool blocking_fence=false;
         int flag;
 
         if (OMPI_SUCCESS != ompi_info_get_bool(info, "blocking_fence",