If thumbnail script fails, node processes may not be reaped

[shawnmjones]

Input was the following URI-Ms:

• http://wayback.archive-it.org/2950/20120510205432/http://blog.nj.com/njv_editorial_page/2012/05/caterpillar_strike_highlights.html
• http://wayback.archive-it.org/2950/20120510205432/http://globalspin.blogs.time.com/2012/05/01/may-day-protests-around-the-globe/
• http://wayback.archive-it.org/2950/20120510205432/http://gothamist.com/2012/05/01/occupy_wall_street_may_day_protests.php
• http://wayback.archive-it.org/2950/20120510205432/http://latino.foxnews.com/latino/politics/2012/05/01/may-day-draws-occupy-protests-and-immigrant-rights-demonstrations/
• http://wayback.archive-it.org/2950/20120510205432/http://money.cnn.com/2012/05/01/news/economy/occupy-may-day/index.htm?hpt=us_c2
• http://wayback.archive-it.org/2950/20120510205432/http://newyork.cbslocal.com/2012/05/01/nypd-bracing-for-possible-ows-may-day-disruptions/
• http://wayback.archive-it.org/2950/20120510205432/http://slatest.slate.com/posts/2012/05/01/occupy_wall_street_holds_may_day_march.html
• http://wayback.archive-it.org/2950/20120510205439/http://online.wsj.com/article/SB10001424052702303916904577377920592687492.html?mod=WSJ_NY_LEFTTopStories
• http://wayback.archive-it.org/2950/20120510205621/http://newsbusters.org/blogs/geoffrey-dickens/2012/05/03/media-breezes-politically-embarrassing-occupy-may-day-protests

MementoEmbed failed while processing http://wayback.archive-it.org/2950/20120510205432/http://gothamist.com/2012/05/01/occupy_wall_street_may_day_protests.php and subsequent URI-Ms.

It timed out after 300 seconds, which should also likely be reported in a separate ticket.