Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/compiler-rt/test/msan/getaddrinfo.cc

@@ -0,0 +1,24 @@
+// RUN: %clangxx_msan -O0 %s -o %t && %run %t
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netdb.h>
+#include <stdlib.h>
+
+void poison_stack_ahead() {
+  char buf[100000];
+  // With -O0 this poisons a large chunk of stack.
+}
+
+int main(void) {
+  poison_stack_ahead();
+
+  struct addrinfo *ai;
+
+  // This should trigger loading of libnss_dns and friends.
+  // Those libraries are typically uninstrumented.They will call strlen() on a
+  // stack-allocated buffer, which is very likely to be poisoned. Test that we
+  // don't report this as an UMR.
+  int res = getaddrinfo("not-in-etc-hosts", NULL, NULL, &ai);
+  return 0;
+}