[GitHub] [incubator-pagespeed-mod] oschaaf commented on issue #2041: mod_pagespeed crashes from time to time

[GitBox <gi...@apache.org>]

oschaaf commented on issue #2041:
URL: https://github.com/apache/incubator-pagespeed-mod/issues/2041#issuecomment-696613828


   TLDR; Based on a hunch, one thing you could try, is configuring `RateLimitBackgroundFetches` to limit the amount of in-flight work. Or switch to use `LoadFromFile` to avoid lots of in-flight http(s) fetches during shutdown altogether.
   
   I have a hunch that this occurs during shutdown. I remember looking into something similar a long time ago, and what happens during shutdown is that some long(ish) running tasks may not return and/or respond to being cancelled in a timely manner. At that point, the module can either just force shut down, or wait longer. Waiting longer is no good, as we're mid-shutdown and that obviously should be bounded in time. So a force shutdown will be initiated, which may tear down live structures from underneath the tasks I mentioned above. Obviously, these tasks may not take that well. In this case it looks lik it the memcached implementation, which relies on apr-memcached, isn't responding (fast enough), but I'm not confident. 
   


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