diff --git a/compiler-rt/lib/dfsan/dfsan_interceptors.cpp b/compiler-rt/lib/dfsan/dfsan_interceptors.cpp
--- a/compiler-rt/lib/dfsan/dfsan_interceptors.cpp
+++ b/compiler-rt/lib/dfsan/dfsan_interceptors.cpp
@@ -46,12 +46,24 @@
   return res;
 }
 
+INTERCEPTOR(int, munmap, void *addr, SIZE_T length) {
+  int res = REAL(munmap)(addr, length);
+  if (res != -1) {
+    uptr beg_shadow_addr = (uptr)__dfsan::shadow_for(addr);
+    void *end_addr = (void *)((uptr)addr + RoundUpTo(length, GetPageSize()));
+    uptr end_shadow_addr = (uptr)__dfsan::shadow_for(end_addr);
+    ReleaseMemoryPagesToOS(beg_shadow_addr, end_shadow_addr);
+  }
+  return res;
+}
+
 namespace __dfsan {
 void InitializeInterceptors() {
   CHECK(!interceptors_initialized);
 
   INTERCEPT_FUNCTION(mmap);
   INTERCEPT_FUNCTION(mmap64);
+  INTERCEPT_FUNCTION(munmap);
 
   interceptors_initialized = true;
 }