diff -r 000000000000 -r 6474c204b198 memory/jemalloc/src/test/mremap.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/memory/jemalloc/src/test/mremap.c	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,60 @@
+#define	JEMALLOC_MANGLE
+#include "jemalloc_test.h"
+
+int
+main(void)
+{
+	int ret, err;
+	size_t sz, lg_chunk, chunksize, i;
+	char *p, *q;
+
+	malloc_printf("Test begin\n");
+
+	sz = sizeof(lg_chunk);
+	if ((err = mallctl("opt.lg_chunk", &lg_chunk, &sz, NULL, 0))) {
+		assert(err != ENOENT);
+		malloc_printf("%s(): Error in mallctl(): %s\n", __func__,
+		    strerror(err));
+		ret = 1;
+		goto label_return;
+	}
+	chunksize = ((size_t)1U) << lg_chunk;
+
+	p = (char *)malloc(chunksize);
+	if (p == NULL) {
+		malloc_printf("malloc(%zu) --> %p\n", chunksize, p);
+		ret = 1;
+		goto label_return;
+	}
+	memset(p, 'a', chunksize);
+
+	q = (char *)realloc(p, chunksize * 2);
+	if (q == NULL) {
+		malloc_printf("realloc(%p, %zu) --> %p\n", p, chunksize * 2,
+		    q);
+		ret = 1;
+		goto label_return;
+	}
+	for (i = 0; i < chunksize; i++) {
+		assert(q[i] == 'a');
+	}
+
+	p = q;
+
+	q = (char *)realloc(p, chunksize);
+	if (q == NULL) {
+		malloc_printf("realloc(%p, %zu) --> %p\n", p, chunksize, q);
+		ret = 1;
+		goto label_return;
+	}
+	for (i = 0; i < chunksize; i++) {
+		assert(q[i] == 'a');
+	}
+
+	free(q);
+
+	ret = 0;
+label_return:
+	malloc_printf("Test end\n");
+	return (ret);
+}