oschaaf commented on issue #1775: Deadlock in shm statistics URL: https://github.com/apache/incubator-pagespeed-mod/issues/1775#issuecomment-396632426 I think that the patch may improve odds, but it's not going to reliably solve the problem. The code all looks good afaict, and that makes me think that the scenario @jmarantz suggested, a process killed while holding a lock, may be a realistic explanation. Also, I worked on some shutdown stuff for ngx_pagespeed [1], which I think actually implemented some of what you suggest. Perhaps it is translatable to the httpd world.. One thing I remember however, is that the stock http fetcher, Serf, is not always able to cancel outstanding fetches in a timely manner. This could still cause trouble. Maybe moving the fetching over to the experimental central controller process could be part of a solution to that. With the image optimization and the fetching happening in another process, we should be able to shut down consistently quickly in all cases. https://github.com/apache/incubator-pagespeed-ngx/commit/d7f1c0dc4817f153da29ced58882cb0bc9787c2c
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