alibaba/tengine — pull request #499 by InfoHunter (2014-07-31 05:16:27+00:00)
Title: Bugfix: in ngx_http_upstream_dynamic_module

If fail_timeout is enabled and fallback action is specified
to either "stale" or "next", a segmentation fault would happen.

Signed-off-by: Paul Yang(InfoHunter)