Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/compiler-rt/test/safestack/pthread-cleanup.c

@@ -0,0 +1,31 @@
+// RUN: %clang_safestack %s -pthread -o %t
+// RUN: not --crash %run %t
+
+// Test that unsafe stacks are deallocated correctly on thread exit.
+
+#include <stdlib.h>
+#include <string.h>
+#include <pthread.h>
+
+enum { kBufferSize = (1 << 15) };
+
+void *t1_start(void *ptr)
+{
+  char buffer[kBufferSize];
+  return buffer;
+}
+
+int main(int argc, char **argv)
+{
+  pthread_t t1;
+  char *buffer = NULL;
+
+  if (pthread_create(&t1, NULL, t1_start, NULL))
+    abort();
+  if (pthread_join(t1, &buffer))
+    abort();
+
+  // should segfault here
+  memset(buffer, 0, kBufferSize);
+  return 0;
+}