diff --git a/clang/lib/Driver/ToolChains/Darwin.cpp b/clang/lib/Driver/ToolChains/Darwin.cpp
index 220bc8f9835..4f7ce485777 100644
--- a/clang/lib/Driver/ToolChains/Darwin.cpp
+++ b/clang/lib/Driver/ToolChains/Darwin.cpp
@@ -1143,7 +1143,7 @@ void Darwin::addProfileRTLibs(const ArgList &Args,
   // runtime's functionality.
   if (hasExportSymbolDirective(Args)) {
     if (ForGCOV) {
-      addExportedSymbol(CmdArgs, "___gcov_flush");
+      addExportedSymbol(CmdArgs, "___custom_llvm_gcov_flush");
       addExportedSymbol(CmdArgs, "_flush_fn_list");
       addExportedSymbol(CmdArgs, "_writeout_fn_list");
     } else {
diff --git a/compiler-rt/lib/profile/GCDAProfiling.c b/compiler-rt/lib/profile/GCDAProfiling.c
index 498c05900bf..b7257db10e7 100644
--- a/compiler-rt/lib/profile/GCDAProfiling.c
+++ b/compiler-rt/lib/profile/GCDAProfiling.c
@@ -619,7 +619,7 @@ void llvm_register_flush_function(fn_ptr fn) {
   fn_list_insert(&flush_fn_list, fn);
 }
 
-void __gcov_flush() {
+void __custom_llvm_gcov_flush() {
   struct fn_node* curr = flush_fn_list.head;
 
   while (curr) {
diff --git a/compiler-rt/test/tsan/pthread_atfork_deadlock2.c b/compiler-rt/test/tsan/pthread_atfork_deadlock2.c
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/llvm/lib/Transforms/Instrumentation/GCOVProfiling.cpp b/llvm/lib/Transforms/Instrumentation/GCOVProfiling.cpp
index bf3e4ed3e31..37bdcfaeab8 100644
--- a/llvm/lib/Transforms/Instrumentation/GCOVProfiling.cpp
+++ b/llvm/lib/Transforms/Instrumentation/GCOVProfiling.cpp
@@ -656,7 +656,7 @@ void GCOVProfiler::AddFlushBeforeForkAndExec() {
   for (auto I : ForkAndExecs) {
     IRBuilder<> Builder(I);
     FunctionType *FTy = FunctionType::get(Builder.getVoidTy(), {}, false);
-    FunctionCallee GCOVFlush = M->getOrInsertFunction("__gcov_flush", FTy);
+    FunctionCallee GCOVFlush = M->getOrInsertFunction("__custom_llvm_gcov_flush", FTy);
     Builder.CreateCall(GCOVFlush);
     I->getParent()->splitBasicBlock(I);
   }