Index: test/asan/TestCases/Posix/large_allocator_unpoisons_on_free.cc
===================================================================
--- test/asan/TestCases/Posix/large_allocator_unpoisons_on_free.cc
+++ test/asan/TestCases/Posix/large_allocator_unpoisons_on_free.cc
@@ -27,7 +27,14 @@
   void *p = my_memalign(kPageSize, 1024 * 1024);
   free(p);
 
-  char *q = (char *)mmap(p, kPageSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON | MAP_FIXED, 0, 0);
+  // FreeBSD requires fd to be (-1) when MAP_ANON is specified.
+#if defined(__FreeBSD__)
+  const int fd = (-1);
+#else
+  const int fd = 0;
+#endif
+  char *q = (char *)mmap(p, kPageSize, PROT_READ | PROT_WRITE,
+                         MAP_PRIVATE | MAP_ANON | MAP_FIXED, fd, 0);
   assert(q == p);
 
   memset(q, 42, kPageSize);
Index: test/asan/TestCases/dlclose-test.cc
===================================================================
--- test/asan/TestCases/dlclose-test.cc
+++ test/asan/TestCases/dlclose-test.cc
@@ -62,11 +62,17 @@
     printf("failed to dlclose\n");
     return 1;
   }
+  // FreeBSD requires fd to be (-1) when MAP_ANON is specified.
+#if defined(__FreeBSD__)
+  const int fd = (-1);
+#else
+  const int fd = 0;
+#endif
   // Now, the page where 'addr' is unmapped. Map it.
   size_t page_beg = ((size_t)addr) & ~(PageSize - 1);
   void *res = mmap((void*)(page_beg), PageSize,
                    PROT_READ | PROT_WRITE,
-                   MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE, 0, 0);
+                   MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE, fd, 0);
   if (res == (char*)-1L) {
     printf("failed to mmap\n");
     return 1;