http://bugs.winehq.org/show_bug.cgi?id=35576
--- Comment #1 from François Gouget fgouget@codeweavers.com --- One case where staging files can be leaked is simply if one goes to the 'Submit Job' page, upload a patch, and simply close the web page. In the first 'Submit Job' step the patch is uploaded to the staging directory but that it is only put in place once the job is created in the last step.
Furthermore, opening two 'Submit Job' windows to submit the same patch twice results in a staging filename collision so that one of the jobs has a broken patch filename.