diff --git a/compiler-rt/lib/tsan/rtl/tsan_interceptors_posix.cpp b/compiler-rt/lib/tsan/rtl/tsan_interceptors_posix.cpp
--- a/compiler-rt/lib/tsan/rtl/tsan_interceptors_posix.cpp
+++ b/compiler-rt/lib/tsan/rtl/tsan_interceptors_posix.cpp
@@ -1202,6 +1202,21 @@
       m);
 }
 
+#if SANITIZER_LINUX
+INTERCEPTOR(int, pthread_cond_clockwait, void *c, void *m,
+            __sanitizer_clockid_t clock, void *abstime) {
+  void *cond = init_cond(c);
+  SCOPED_TSAN_INTERCEPTOR(pthread_cond_clockwait, cond, m, clock, abstime);
+  return cond_wait(
+      thr, pc, &si,
+      [=]() { return REAL(pthread_cond_clockwait)(cond, m, clock, abstime); },
+      cond, m);
+}
+#define TSAN_MAYBE_PTHREAD_COND_CLOCKWAIT TSAN_INTERCEPT(pthread_cond_clockwait)
+#else
+#define TSAN_MAYBE_PTHREAD_COND_CLOCKWAIT
+#endif
+
 #if SANITIZER_MAC
 INTERCEPTOR(int, pthread_cond_timedwait_relative_np, void *c, void *m,
             void *reltime) {
@@ -2716,6 +2731,8 @@
   TSAN_INTERCEPT_VER(pthread_cond_timedwait, PTHREAD_ABI_BASE);
   TSAN_INTERCEPT_VER(pthread_cond_destroy, PTHREAD_ABI_BASE);
 
+  TSAN_MAYBE_PTHREAD_COND_CLOCKWAIT;
+
   TSAN_INTERCEPT(pthread_mutex_init);
   TSAN_INTERCEPT(pthread_mutex_destroy);
   TSAN_INTERCEPT(pthread_mutex_trylock);
diff --git a/compiler-rt/test/tsan/Linux/clockwait_double_lock.c b/compiler-rt/test/tsan/Linux/clockwait_double_lock.c
new file mode 100644
--- /dev/null
+++ b/compiler-rt/test/tsan/Linux/clockwait_double_lock.c
@@ -0,0 +1,31 @@
+// Regression test for https://github.com/google/sanitizers/issues/1259
+// RUN: %clang_tsan -O1 %s -o %t && %run %t
+
+#define _GNU_SOURCE
+#include <pthread.h>
+
+pthread_cond_t cv;
+pthread_mutex_t mtx;
+
+void *fn(void *vp) {
+  pthread_mutex_lock(&mtx);
+  pthread_cond_signal(&cv);
+  pthread_mutex_unlock(&mtx);
+  return NULL;
+}
+
+int main() {
+  pthread_mutex_lock(&mtx);
+
+  pthread_t tid;
+  pthread_create(&tid, NULL, fn, NULL);
+
+  struct timespec ts;
+  clock_gettime(CLOCK_MONOTONIC, &ts);
+  ts.tv_sec += 10;
+  pthread_cond_clockwait(&cv, &mtx, CLOCK_MONOTONIC, &ts);
+  pthread_mutex_unlock(&mtx);
+
+  pthread_join(tid, NULL);
+  return 0;
+}