diff --git a/libdispatch/nclist.c b/libdispatch/nclist.c
index 4890119d0..679c1b174 100644
--- a/libdispatch/nclist.c
+++ b/libdispatch/nclist.c
@@ -53,12 +53,16 @@ Free a list and its contents
 int
 nclistfreeall(NClist* l)
 {
-  size_t i;
+  size_t i,len;
+  void** content = NULL;
   if(l == NULL) return TRUE;
-  for(i=0;i<l->length;i++) {
-      void* value = l->content[i];
+  len = l->length;
+  content = nclistextract(l);
+  for(i=0;i<len;i++) {
+      void* value = content[i];
       if(value != NULL) free(value);
   }
+  if(content != NULL) free(content);
   return nclistfree(l);
 }
 
diff --git a/libhdf5/hdf5file.c b/libhdf5/hdf5file.c
index 61f8594a8..965c41bf1 100644
--- a/libhdf5/hdf5file.c
+++ b/libhdf5/hdf5file.c
@@ -208,6 +208,7 @@ nc4_close_netcdf4_file(NC_FILE_INFO_T *h5, int abort, NC_memio* memio)
     * hidden attribute. */
    if (h5->provenance)
       NC4_free_provenance(h5->provenance);
+   h5->provenance = NULL; /* Avoid double dealloc */
 
    /* Close hdf file. It may not be open, since this function is also
     * called by NC_create() when a file opening is aborted. */
diff --git a/libhdf5/nc4info.c b/libhdf5/nc4info.c
index 608ab9601..974ae5585 100644
--- a/libhdf5/nc4info.c
+++ b/libhdf5/nc4info.c
@@ -64,17 +64,22 @@ NC4_provenance_init(void)
 	{stat = NC_ENOMEM; goto done;}
 
     /* Insert primary library version as first entry */
-    if((value = strdup(PACKAGE_VERSION)) == NULL)
-	{stat = NC_ENOMEM; goto done;}
-    
     if((name = strdup(NCPNCLIB2)) == NULL)
 	{stat = NC_ENOMEM; goto done;}
     nclistpush(globalpropinfo.properties,name);
-    name = NULL;
+    name = NULL; /* Avoid multiple free() */
+
+    if((value = strdup(PACKAGE_VERSION)) == NULL)
+	{stat = NC_ENOMEM; goto done;}
     nclistpush(globalpropinfo.properties,value);
     value = NULL;
     
     /* Insert the HDF5 as underlying storage format library */
+    if((name = strdup(NCPHDF5LIB2)) == NULL)
+	{stat = NC_ENOMEM; goto done;}
+    nclistpush(globalpropinfo.properties,name);
+    name = NULL;
+
     stat = NC4_hdf5get_libversion(&major,&minor,&release);
     if(stat) goto done;
     {
@@ -83,10 +88,6 @@ NC4_provenance_init(void)
 	if((value = strdup(sversion)) == NULL)
 	    {stat = NC_ENOMEM; goto done;}
     }
-    if((name = strdup(NCPHDF5LIB2)) == NULL)
-	{stat = NC_ENOMEM; goto done;}
-    nclistpush(globalpropinfo.properties,name);
-    name = NULL;
     nclistpush(globalpropinfo.properties,value);
     value = NULL;
 
@@ -101,6 +102,8 @@ NC4_provenance_init(void)
     /* merge into the properties list */
     for(i=0;i<nclistlength(other);i++)
 	nclistpush(globalpropinfo.properties,strdup(nclistget(other,i)));
+    nclistfreeall(other);
+    other = NULL;
 
 done:
     if(name != NULL) free(name);
@@ -347,20 +350,25 @@ NC4_set_provenance(NC_FILE_INFO_T* file, const struct NCPROPINFO* dfalt)
 
     /* Initialize from the default */
     provenance->propattr.version = globalpropinfo.version;
-    provenance->propattr.properties = nclistnew();
-    if(provenance->propattr.properties == NULL)
-	{ncstat = NC_ENOMEM; goto done;}
-    
     /* Get the superblock number */
     if((ncstat = NC4_hdf5get_superblock(file,&superblock)))
 	goto done;
     provenance->superblockversion = superblock;
 
+    /* Capture properties */
+    provenance->propattr.properties = nclistnew();
+    if(provenance->propattr.properties == NULL)
+	{ncstat = NC_ENOMEM; goto done;}
     /* add in the dfalt values */
     if(dfalt != NULL) {
 	int i;
 	for(i=0;i<nclistlength(dfalt->properties);i++) {
-	    nclistpush(provenance->propattr.properties,nclistget(dfalt->properties,i));
+	    char* prop = nclistget(dfalt->properties,i);
+	    if(prop != NULL) {
+		prop = strdup(prop);
+		if(prop == NULL) {ncstat = NC_ENOMEM; goto done;}
+	        nclistpush(provenance->propattr.properties,prop);
+	    }
 	}
     }
 
@@ -472,8 +480,9 @@ int
 NC4_free_provenance(struct NCPROVENANCE* prov)
 {
     if(prov == NULL) return NC_NOERR;
-    if(prov->propattr.properties)
+    if(prov->propattr.properties != NULL);
 	nclistfreeall(prov->propattr.properties);
+    prov->propattr.properties = NULL;
     free(prov);
     return NC_NOERR;
 }
diff --git a/libsrc/memio.c b/libsrc/memio.c
index d16b1c3c6..7133d0ab4 100644
--- a/libsrc/memio.c
+++ b/libsrc/memio.c
@@ -75,7 +75,7 @@ typedef int ssize_t;
 #undef X_ALIGN
 #endif
 
-#undef REALLOCBUG
+#define REALLOCBUG
 #ifdef REALLOCBUG
 /* There is some kind of realloc bug that I cannot solve yet */
 #define reallocx(m,new,old) realloc(m,new)
@@ -84,7 +84,10 @@ static void*
 reallocx(void* mem, size_t newsize, size_t oldsize)
 {
     void* m = malloc(newsize);
-    memcpy(m,mem,oldsize);
+    if(m != NULL) {
+        memcpy(m,mem,oldsize);
+	free(mem);
+    }
     return m;
 }
 #endif
@@ -334,6 +337,8 @@ memio_open(const char* path,
 
     sizehint = *sizehintp;
 
+    memset(&meminfo,0,sizeof(meminfo));
+
     if(inmemory) { /* parameters provide the memory chunk */
 	NC_memio* memparams = (NC_memio*)parameters;
         meminfo = *memparams;
@@ -490,7 +495,8 @@ fprintf(stderr,"realloc: %lu/%lu -> %lu/%lu\n",
 
 /*! Write out any dirty buffers to disk.
 
-  Write out any dirty buffers to disk and ensure that next read will get data from disk. Sync any changes, then close the open file associated with the ncio struct, and free its memory.
+  Write out any dirty buffers to disk and ensure that next read will get data from disk.
+  Sync any changes, then close the open file associated with the ncio struct, and free its memory.
 
   @param[in] nciop pointer to ncio to close.
   @param[in] doUnlink if true, unlink file
@@ -632,8 +638,8 @@ memio_sync(ncio* const nciop)
     return NC_NOERR; /* do nothing */
 }
 
-/* "Hidden" Internal function to extract a copy of
-   the size and/or contents of the memory
+/* "Hidden" Internal function to extract the 
+   the size and/or contents of the memory.
 */
 int
 memio_extract(ncio* const nciop, size_t* sizep, void** memoryp)
@@ -735,9 +741,11 @@ readfile(const char* path, NC_memio* memio)
     if(memio) {
 	memio->size = (size_t)filesize;
 	memio->memory = memory;
-    }    
+	memory = NULL;
+    }
+
 done:
-    if(status != NC_NOERR && memory != NULL)
+    if(memory != NULL)
 	free(memory);
     if(f != NULL) fclose(f);
     return status;    
diff --git a/nc_test/Make0 b/nc_test/Make0
index 6c57bd893..e21901094 100644
--- a/nc_test/Make0
+++ b/nc_test/Make0
@@ -1,17 +1,17 @@
 # Test c output
-T=tst_diskless3
+T=tst_diskless5
 
 #H58=8
 H510=10
 
-ARGS=diskless persist
+#ARGS=diskless persist
 
 #SRC=
 
 #CMD=env HDF5_DEBUG=trace
 #CMD=export NETCDF_LOG_LEVEL=5 ;gdb --args
 CMD=valgrind --leak-check=full
-CMD=gdb --args
+#CMD=gdb --args
 
 #PAR=1
 
@@ -48,3 +48,10 @@ cmp::
 
 cpp::
 	${CC} -E ${CFLAGS} ${T}.c > ${T}.txt
+
+#TS = tst_diskless tst_diskless2 tst_diskless3 tst_diskless4 tst_diskless5 tst_diskless6
+TS = tst_diskless5
+several::
+	export LD_LIBRARY_PATH=${LLP}; export CFLAGS; export LDFLAGS; \
+	for f in ${TS} ; do ${CC} -o ${TS} ${CFLAGS} ${TS}.c ${SRC} ${LDFLAGS}; done
+
diff --git a/nc_test/Makefile.am b/nc_test/Makefile.am
index 9e4a8c637..b3e777254 100644
--- a/nc_test/Makefile.am
+++ b/nc_test/Makefile.am
@@ -122,3 +122,13 @@ endif
 
 # If valgrind is present, add valgrind targets.
 @VALGRIND_CHECK_RULES@
+
+
+
+# For some reason, it appears that we need to make the .sh files
+# depend on the programs they run when doing check-valgrind
+run_diskless.sh: tst_diskless tst_diskless2 tst_diskless3
+run_diskless5.sh: tst_diskless5
+run_inmemory.sh: tst_inmemory tst_open_mem
+run_diskless2.sh: tst_diskless4
+run_cdf5.sh: tst_open_cdf5
diff --git a/nc_test4/Makefile.am b/nc_test4/Makefile.am
index d4c8842ce..9de70f02b 100644
--- a/nc_test4/Makefile.am
+++ b/nc_test4/Makefile.am
@@ -23,7 +23,7 @@ AM_LDFLAGS += ${top_builddir}/liblib/libnetcdf.la
 LDADD = ${top_builddir}/liblib/libnetcdf.la
 
 # These are netCDF-4 C test programs which are built and run.
-NC4_TESTS = tst_dims tst_dims2 tst_dims3 tst_files tst_files4		\
+NC4_TESTS = tst_dims tst_dims2 tst_dims3 tst_files tst_files4 		\
 tst_vars tst_varms tst_unlim_vars tst_converts tst_converts2 tst_grps	\
 tst_grps2 tst_compounds tst_compounds2 tst_compounds3 tst_opaques	\
 tst_strings tst_strings2 tst_interops tst_interops4 tst_interops5	\
@@ -151,3 +151,15 @@ DISTCLEANFILES = findplugin.sh
 
 # If valgrind is present, add valgrind targets.
 @VALGRIND_CHECK_RULES@
+
+# Keep check-valgrind happy
+run_grp_rename.sh: renamegroup
+run_empty_vlen_test.sh: tst_empty_vlen_unlim
+tst_szip.sh: test_szip h5testszip
+tst_filter.sh: test_filter test_filter_misc
+run_tst_chunks.sh: tst_chunks3
+run_knmi_bm.sh: tst_knm
+run_bm_test1.sh: bm_file
+run_bm_test2.sh: bm_file
+run_bm_elena.sh: bm_file
+perftest.sh: bigmeta openbigmeta