[msan] Don't delete MSanAtExitRecord

Summary:
Pre 2.27 libc can run same atexit handler twice
We will keep MSanAtExitRecord and reset fun to mark it as executed.

Fix PR40162

Reviewers: eugenis

Subscribers: jfb, jdoerfert, #sanitizers, llvm-commits

Tags: #sanitizers, #llvm

Differential Revision: https://reviews.llvm.org/D58221

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@354005 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 35 insertions, 0 deletions

diff --git a/test/msan/cxa_atexit_race.cc b/test/msan/cxa_atexit_race.cc
new file mode 100644
index 000000000..f6e7a225b
--- /dev/null
+++ b/test/msan/cxa_atexit_race.cc
@@ -0,0 +1,35 @@
+// RUN: %clangxx_msan %s -o %t && %run %t 2>&1 | FileCheck %s
+
+#include <atomic>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+extern "C" int
+__cxa_atexit(void (*func)(void *), void *arg, void *d);
+
+void handler(void *) {
+}
+
+std::atomic_int counter;
+
+void *thread(void *) {
+  for (int i = 0; i < 10000; ++i) {
+    __cxa_atexit(&handler, 0, (void *)&handler);
+    ++counter;
+  }
+  return 0;
+}
+
+int main(void) {
+  printf("TEST_MAIN\n");
+  pthread_t pt;
+  for (int i = 0; i < 2; ++i)
+    pthread_create(&pt, 0, &thread, 0);
+  while (counter < 1000) {
+  };
+  return 0;
+}
+// CHECK: TEST_MAIN
+// CHECK-NOT: MemorySanitizer