Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/compiler-rt/test/tsan/race_with_finished_thread.cc

@@ -0,0 +1,42 @@
+// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
+#include "test.h"
+
+// Ensure that we can restore a stack of a finished thread.
+
+int g_data;
+
+void __attribute__((noinline)) foobar(int *p) {
+  *p = 42;
+}
+
+void *Thread1(void *x) {
+  foobar(&g_data);
+  barrier_wait(&barrier);
+  return NULL;
+}
+
+void *Thread2(void *x) {
+  barrier_wait(&barrier);
+  sleep(1); // let the thread finish and exit
+  g_data = 43;
+  return NULL;
+}
+
+int main() {
+  barrier_init(&barrier, 2);
+  pthread_t t[2];
+  pthread_create(&t[0], NULL, Thread1, NULL);
+  pthread_create(&t[1], NULL, Thread2, NULL);
+  pthread_join(t[0], NULL);
+  pthread_join(t[1], NULL);
+  return 0;
+}
+
+// CHECK: WARNING: ThreadSanitizer: data race
+// CHECK:   Write of size 4 at {{.*}} by thread T2:
+// CHECK:   Previous write of size 4 at {{.*}} by thread T1:
+// CHECK:     #0 foobar
+// CHECK:     #1 Thread1
+// CHECK:   Thread T1 (tid={{.*}}, finished) created by main thread at:
+// CHECK:     #0 pthread_create
+// CHECK:     #1 main