diff -r 000000000000 -r 6474c204b198 memory/jemalloc/src/test/ALLOCM_ARENA.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/memory/jemalloc/src/test/ALLOCM_ARENA.c	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,66 @@
+#define	JEMALLOC_MANGLE
+#include "jemalloc_test.h"
+
+#define	NTHREADS 10
+
+void *
+je_thread_start(void *arg)
+{
+	unsigned thread_ind = (unsigned)(uintptr_t)arg;
+	unsigned arena_ind;
+	int r;
+	void *p;
+	size_t rsz, sz;
+
+	sz = sizeof(arena_ind);
+	if (mallctl("arenas.extend", &arena_ind, &sz, NULL, 0)
+	    != 0) {
+		malloc_printf("Error in arenas.extend\n");
+		abort();
+	}
+
+	if (thread_ind % 4 != 3) {
+		size_t mib[3];
+		size_t miblen = sizeof(mib) / sizeof(size_t);
+		const char *dss_precs[] = {"disabled", "primary", "secondary"};
+		const char *dss = dss_precs[thread_ind % 4];
+		if (mallctlnametomib("arena.0.dss", mib, &miblen) != 0) {
+			malloc_printf("Error in mallctlnametomib()\n");
+			abort();
+		}
+		mib[1] = arena_ind;
+		if (mallctlbymib(mib, miblen, NULL, NULL, (void *)&dss,
+		    sizeof(const char *))) {
+			malloc_printf("Error in mallctlbymib()\n");
+			abort();
+		}
+	}
+
+	r = allocm(&p, &rsz, 1, ALLOCM_ARENA(arena_ind));
+	if (r != ALLOCM_SUCCESS) {
+		malloc_printf("Unexpected allocm() error\n");
+		abort();
+	}
+
+	return (NULL);
+}
+
+int
+main(void)
+{
+	je_thread_t threads[NTHREADS];
+	unsigned i;
+
+	malloc_printf("Test begin\n");
+
+	for (i = 0; i < NTHREADS; i++) {
+		je_thread_create(&threads[i], je_thread_start,
+		    (void *)(uintptr_t)i);
+	}
+
+	for (i = 0; i < NTHREADS; i++)
+		je_thread_join(threads[i], NULL);
+
+	malloc_printf("Test end\n");
+	return (0);
+}