Index: compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
===================================================================
--- compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
+++ compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
@@ -4054,6 +4054,24 @@
 #define INIT_PTHREAD_MUTEX_UNLOCK
 #endif
 
+#if SANITIZER_INTERCEPT___PTHREAD_MUTEX
+INTERCEPTOR(int, __pthread_mutex_lock, void *m) {
+  return WRAP(pthread_mutex_lock)(m);
+}
+
+INTERCEPTOR(int, __pthread_mutex_unlock, void *m) {
+  return WRAP(pthread_mutex_unlock)(m);
+}
+
+#define INIT___PTHREAD_MUTEX_LOCK \
+  COMMON_INTERCEPT_FUNCTION(__pthread_mutex_lock)
+#define INIT___PTHREAD_MUTEX_UNLOCK \
+  COMMON_INTERCEPT_FUNCTION(__pthread_mutex_unlock)
+#else
+#define INIT___PTHREAD_MUTEX_LOCK
+#define INIT___PTHREAD_MUTEX_UNLOCK
+#endif
+
 #if SANITIZER_NETBSD
 INTERCEPTOR(int, __libc_mutex_lock, void *m) \
   ALIAS(WRAPPER_NAME(pthread_mutex_lock));
@@ -7291,6 +7309,8 @@
   INIT__EXIT;
   INIT_PTHREAD_MUTEX_LOCK;
   INIT_PTHREAD_MUTEX_UNLOCK;
+  INIT___PTHREAD_MUTEX_LOCK;
+  INIT___PTHREAD_MUTEX_UNLOCK;
   INIT_GETMNTENT;
   INIT_GETMNTENT_R;
   INIT_STATFS;
Index: compiler-rt/lib/sanitizer_common/sanitizer_platform_interceptors.h
===================================================================
--- compiler-rt/lib/sanitizer_common/sanitizer_platform_interceptors.h
+++ compiler-rt/lib/sanitizer_common/sanitizer_platform_interceptors.h
@@ -365,6 +365,7 @@
   (SI_LINUX || SI_FREEBSD || SI_NETBSD || SI_OPENBSD || SI_MAC || SI_SOLARIS)
 
 #define SANITIZER_INTERCEPT_PTHREAD_MUTEX SI_POSIX
+#define SANITIZER_INTERCEPT___PTHREAD_MUTEX SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_PTHREAD_SETNAME_NP \
   (SI_FREEBSD || SI_NETBSD || SI_OPENBSD || SI_LINUX_NOT_ANDROID || SI_SOLARIS)
 #define SANITIZER_INTERCEPT_PTHREAD_GETNAME_NP \
Index: compiler-rt/test/sanitizer_common/TestCases/Linux/pthread_mutex.cc
===================================================================
--- /dev/null
+++ compiler-rt/test/sanitizer_common/TestCases/Linux/pthread_mutex.cc
@@ -0,0 +1,35 @@
+// RUN: %clangxx -O1 %s -o %t && %run %t
+// RUN: %clangxx -O1 -DUSE_GLIBC %s -o %t && %run %t
+// UNSUPPORTED: android
+
+#include <pthread.h>
+
+#ifdef USE_GLIBC
+extern "C" int __pthread_mutex_lock(pthread_mutex_t *__mutex);
+extern "C" int __pthread_mutex_unlock(pthread_mutex_t *__mutex);
+#define LOCK __pthread_mutex_lock
+#define UNLOCK __pthread_mutex_unlock
+#else
+#define LOCK pthread_mutex_lock
+#define UNLOCK pthread_mutex_unlock
+#endif
+
+pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER;
+int x;
+
+static void *Start(void *arg) {
+  LOCK(&m);
+  ++x;
+  UNLOCK(&m);
+  return nullptr;
+}
+
+int main() {
+  pthread_t threads[2] = {};
+  for (pthread_t &t : threads) 
+    pthread_create(&t, 0, &Start, 0);
+  for (pthread_t &t : threads) 
+    pthread_join(t, 0);
+  return 0;
+}
+