diff --git a/test/tsan/Linux/fork_multithreaded4.cpp b/test/tsan/Linux/fork_multithreaded4.cpp
new file mode 100644
index 0000000..927f5a6
--- /dev/null
+++ b/test/tsan/Linux/fork_multithreaded4.cpp
@@ -0,0 +1,46 @@
+// RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
+
+// The test tries to provoke internal allocator to be locked during fork
+// and then force the child process to use the internal allocator.
+
+#include "../test.h"
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+static void *forker(void *arg) {
+  void *p = calloc(1, 16);
+  static_cast<volatile int *>(p)[0]++;
+  __atomic_fetch_add(static_cast<int *>(p), 1, __ATOMIC_SEQ_CST);
+  int pid = fork();
+  if (pid < 0) {
+    fprintf(stderr, "failed to fork (%d)\n", errno);
+    exit(1);
+  }
+  if (pid == 0) {
+    __atomic_fetch_add(&static_cast<int *>(p)[1], 1, __ATOMIC_SEQ_CST);
+    exit(0);
+  }
+  int status = 0;
+  while (waitpid(pid, &status, 0) != pid) {
+  }
+  if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
+    fprintf(stderr, "subprocess failed (%d)\n", status);
+    exit(1);
+  }
+  free(p);
+  return 0;
+}
+
+int main() {
+  for (int i = 0; i < 10; i++) {
+    pthread_t threads[100];
+    for (auto &th : threads)
+      pthread_create(&th, 0, forker, 0);
+    for (auto th : threads)
+      pthread_join(th, 0);
+  }
+  fprintf(stderr, "DONE\n");
+}
+
+// CHECK: DONE