1 files changed, 34 insertions, 0 deletions
diff --git a/test/asan/TestCases/Posix/concurrent_overflow.cpp b/test/asan/TestCases/Posix/concurrent_overflow.cpp
new file mode 100644
index 000000000..345b54685
--- /dev/null
+++ b/test/asan/TestCases/Posix/concurrent_overflow.cpp
@@ -0,0 +1,34 @@
+// RUN: %clangxx_asan -O0 -w %s -o %t && not %run %t 2>&1 | FileCheck %s
+
+// Checks that concurrent reports will not trigger false "nested bug" reports.
+// Regression test for https://github.com/google/sanitizers/issues/858
+
+#include <pthread.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+static void *start_routine(void *arg) {
+  volatile int *counter = (volatile int *)arg;
+  char buf[8];
+  __atomic_sub_fetch(counter, 1, __ATOMIC_SEQ_CST);
+  while (*counter)
+    ;
+  buf[0] = buf[9];
+  return 0;
+}
+
+int main(void) {
+  const int n_threads = 8;
+  int i, counter = n_threads;
+  pthread_t thread[n_threads];
+
+  for (i = 0; i < n_threads; ++i)
+    pthread_create(&thread[i], NULL, &start_routine, (void *)&counter);
+  for (i = 0; i < n_threads; ++i)
+    pthread_join(thread[i], NULL);
+  return 0;
+}
+
+// CHECK-NOT: nested bug
+// CHECK: ERROR: AddressSanitizer: stack-buffer-overflow on address
+// CHECK: SUMMARY: AddressSanitizer: stack-buffer-overflow