Index: compiler-rt/trunk/lib/asan/asan_interceptors.h
===================================================================
--- compiler-rt/trunk/lib/asan/asan_interceptors.h
+++ compiler-rt/trunk/lib/asan/asan_interceptors.h
@@ -46,11 +46,13 @@
 # define ASAN_INTERCEPT__LONGJMP 1
 # define ASAN_INTERCEPT_INDEX 1
 # define ASAN_INTERCEPT_PTHREAD_CREATE 1
+# define ASAN_INTERCEPT_VFORK 1
 #else
 # define ASAN_INTERCEPT_ATOLL_AND_STRTOLL 0
 # define ASAN_INTERCEPT__LONGJMP 0
 # define ASAN_INTERCEPT_INDEX 0
 # define ASAN_INTERCEPT_PTHREAD_CREATE 0
+# define ASAN_INTERCEPT_VFORK 0
 #endif
 
 #if SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD || \
Index: compiler-rt/trunk/lib/asan/asan_interceptors.cc
===================================================================
--- compiler-rt/trunk/lib/asan/asan_interceptors.cc
+++ compiler-rt/trunk/lib/asan/asan_interceptors.cc
@@ -572,6 +572,13 @@
 }
 #endif  // ASAN_INTERCEPT___CXA_ATEXIT
 
+#if ASAN_INTERCEPT_VFORK
+extern "C" int fork(void);
+INTERCEPTOR(int, vfork, void) {
+  return fork();
+}
+#endif  // ASAN_INTERCEPT_VFORK
+
 // ---------------------- InitializeAsanInterceptors ---------------- {{{1
 namespace __asan {
 void InitializeAsanInterceptors() {
@@ -649,6 +656,10 @@
   ASAN_INTERCEPT_FUNC(__cxa_atexit);
 #endif
 
+#if ASAN_INTERCEPT_VFORK
+  ASAN_INTERCEPT_FUNC(vfork);
+#endif
+
   InitializePlatformInterceptors();
 
   VReport(1, "AddressSanitizer: libc interceptors initialized\n");
Index: compiler-rt/trunk/test/asan/TestCases/Posix/vfork.cc
===================================================================
--- compiler-rt/trunk/test/asan/TestCases/Posix/vfork.cc
+++ compiler-rt/trunk/test/asan/TestCases/Posix/vfork.cc
@@ -0,0 +1,30 @@
+// Test that vfork() is fork().
+// https://github.com/google/sanitizers/issues/925
+
+// RUN: %clangxx_asan -O0 %s -o %t && %run %t 2>&1
+
+#include <assert.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+int volatile global;
+
+int main(int argc, char **argv) {
+  pid_t pid = vfork();
+  if (pid) {
+    // parent
+    int status;
+    int res;
+    do {
+      res = waitpid(pid, &status, 0);
+    } while (res >= 0 && !WIFEXITED(status) && !WIFSIGNALED(status));
+    assert(global == 0);
+  } else {
+    // child
+    global = 42;
+    _exit(0);
+  }
+
+  return 0;
+}