Not sure exactly what's going on here but bug 507339 removed a file that was in the repo, and was also getting preprocessed into the source dir. When you try to 'hg pull -u' in that state you get: pulling from http://hg.mozilla.org/mozilla-central searching for changes adding changesets adding manifests adding file changes added 8 changesets with 24 changes to 20 files local changed toolkit/mozapps/update/test/unit/head_update.js which remote deleted use (c)hanged version or (d)elete? and it times out because we didn't get buy the Imp module for ESX. So I set a clobber, but that didn't work on several slaves because they hit the 'free space clobber' test first and decided there was no need to clobber. We need to take a look and see if the clobberer script has any idea about scratchbox build dirs. Here's a log for a build which is the first one on that slave after the clobber was set, http://production-master.build.mozilla.org:8010/builders/Maemo%20mozilla-central%20build/builds/1688

Yeah, I realized this a while ago. It hasn't been an issue til recently, so didn't really get much attention.