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[Bug 62668] httpd threads spinning at 100%


https://bz.apache.org/bugzilla/show_bug.cgi?id=62668

--- Comment #6 from Bernard Spil <brnrd@xxxxxxxxxxx> ---
(In reply to Yann Ylavic from comment #4)
> Bernard, is this with high concurrency scenario or it can be reproduced with
> a single/few requests?
> 
> Looking at the stacktrace, the most probable looping threads are numbers 60
> to 62, thus ap_filter_output_pending(). Is the endless loop internal to this
> function or MPM event's process_socket() is calling it endlessly?
> 
> If I can't reproduce with a simple scenario, could you please debug that
> loop (latest trunk) and determine why ap_filter_output_pending() either
> never ends or keeps returning OK? It should stop (DECLINED) when the socket
> is completely flushed...

Hi Yann,

I have found that I can reliably reproduce it using "ANALYZE" on
https://developers.google.com/speed/pagespeed/insights
I have not been able to reproduce it by merely loading a page with many
resources. Tried ab too (ab -n 10000 -c 250 https://test.brnrd.eu/) but that
doesn't trigger the issue either.

Yesterday I had issues inspecting the running process, now trying again to see
if I can find out more about the spinning thread.

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