Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/compiler-rt/test/tsan/setuid.c

@@ -0,0 +1,32 @@
+// RUN: %clang_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
+//
+// setuid(0) hangs on powerpc64 big endian.  When this is fixed remove
+// the unsupported flag.
+// https://llvm.org/bugs/show_bug.cgi?id=25799
+//
+// UNSUPPORTED: powerpc64-unknown-linux-gnu
+#include "test.h"
+#include <sys/types.h>
+#include <unistd.h>
+
+// Setuid call used to hang because the background tsan thread did not handle
+// SIGSETXID signal. Note that we don't care whether setuid call succeeds
+// or not.
+
+static void *thread(void *arg) {
+  (void)arg;
+  sleep(1);
+  return 0;
+}
+
+int main() {
+  // Create another thread just for completeness of the picture.
+  pthread_t th;
+  pthread_create(&th, 0, thread, 0);
+  setuid(0);
+  pthread_join(th, 0);
+  fprintf(stderr, "DONE\n");
+  return 0;
+}
+
+// CHECK: DONE