Stop signalling on the strength of a stat file alone

A job killed hard never corrects its own record, so 'running' outlives the
process and the pid can since belong to something else; array-start jobs get
setsid too, so Stop can reach past their direct children.

Plugin/unraid/event/disks_mounted/array_start_jobs

@@ -13,6 +13,8 @@ foreach (\$s as \$id => \$e) {
         : SCRIPTS_DIR . '/' . \$id;
     if (!file_exists(\$script)) continue;
     \$flags = !empty(\$e['log_enabled']) ? ' --log' : '';
-    exec('nohup bash ' . escapeshellarg(\$runner) . ' ' . escapeshellarg(\$id) . ' ' . escapeshellarg(\$script) . \$flags . ' > /dev/null 2>&1 &');
+    // setsid for the same reason as api/run.php: the job must lead its own process group or
+    // api/stop.php cannot signal the tree, only the parent and its direct children.
+    exec('setsid nohup bash ' . escapeshellarg(\$runner) . ' ' . escapeshellarg(\$id) . ' ' . escapeshellarg(\$script) . \$flags . ' > /dev/null 2>&1 &');
 }
 " 2>/dev/null