pagespeed/ngx_pagespeed — pull request #142 by oschaaf (2013-01-22 22:31:56+00:00)
Title: shutdown-sequence: fix a segfault during a shutdown under load

Shut down the driver factory before the proxy fetch factory.
shutting down the driver factory will make sure that all worker
threads are stopped, This prevents in-flight callbacks to
destroyed proxy fetch factories, so we should be able to safely
delete them

this fixes https://github.com/pagespeed/ngx_pagespeed/issues/109