commit 00a654036a10ec9b058067f835d7d28b0af25ee4
Author: Vladimir Lettiev <crux@altlinux.ru>
Date:   Tue Aug 20 16:45:36 2013 +0400

    fixed dist/threads/t/join.t: ps returns nonzero status if /proc is not mounted

diff --git a/dist/threads/t/join.t b/dist/threads/t/join.t
index 2272e07..7cca112 100644
--- a/dist/threads/t/join.t
+++ b/dist/threads/t/join.t
@@ -131,7 +131,7 @@ if ($^O eq 'linux') {
                 last;
             }
         }
-        close PS or die;
+        close PS or die $! if $!;
         if ($sawpid) {
             ok($sawpid && $sawexe, 'altering $0 is effective');
         } else {