diff --git a/tests/page_fault4.c b/tests/page_fault4.c
new file mode 100644
index 0000000..67cfd09
--- /dev/null
+++ b/tests/page_fault4.c
@@ -0,0 +1,35 @@
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <assert.h>
+
+#define MEMSIZE (128 * 1024 * 1024)
+
+char *testcase_description = "Separate file private mapping page read fault";
+
+void testcase(unsigned long long *iterations, unsigned long nr)
+{
+	char tmpfile[] = "/tmp/willitscale.XXXXXX";
+	int fd = mkstemp(tmpfile);
+	unsigned long pgsize = getpagesize();
+
+	assert(fd >= 0);
+	assert(ftruncate(fd, MEMSIZE) == 0);
+	unlink(tmpfile);
+
+	while (1) {
+		unsigned long i;
+		char cc __attribute__((unused));
+
+		char *c = mmap(NULL, MEMSIZE, PROT_READ|PROT_WRITE,
+			       MAP_PRIVATE, fd, 0);
+		assert(c != MAP_FAILED);
+
+		for (i = 0; i < MEMSIZE; i += pgsize) {
+			cc = *(volatile char *)(c + i);
+			(*iterations)++;
+		}
+
+		munmap(c, MEMSIZE);
+	}
+}