timing error in repl_monitor_stress.js

Tue Oct  2 03:33:47 uncaught exception: assert.soon failed: function () {

    try {

        mongos.getDB("test").user.find().explain();

    } catch (x) {

        print("query error, try again: " + x);

    }

    return waitNodeCount(NODE_COUNT - 1);

}, msg:timed out waiting for node to be removed

failed to load: /mnt/data/slaves/Linux_64bit_Legacy_Nightly/mongo/jstests/slowNightly/repl_monitor_stress.js