Bug 51655 - Problems with mod_mono_server4
Summary: Problems with mod_mono_server4
Alias: None
Product: Runtime
Classification: Mono
Component: General ()
Version: 4.6.0 (C8)
Hardware: PC Linux
: --- normal
Target Milestone: Future Cycle (TBD)
Assignee: Bugzilla
Depends on:
Reported: 2017-01-20 08:32 UTC by Toshko Andreev
Modified: 2017-07-06 18:27 UTC (History)
3 users (show)

Is this bug a regression?: ---
Last known good build:

apache log file (25.97 KB, text/plain)
2017-01-20 08:32 UTC, Toshko Andreev

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Description Toshko Andreev 2017-01-20 08:32:45 UTC
Created attachment 19412 [details]
apache log file

Greetings, we're running a .NET 4.6 based async long-polling implementation under Ubuntu 16.04 LTS and are sporadically getting hanged mod_mono_server4.exe processes. Attached is an apache log that has been running for a couple of days.

We've fiddled with KeepAlive and MonoMaxActiveRequests, MonoMaxWaitingRequests and have gotten it working for a few days, but then it hangs again with three mod_mono_server4.exe processes staying active with 2-3 cores being used at 80% to 100%.
Comment 1 Ludovic Henry 2017-07-06 15:07:25 UTC

Did you have a chance to try with latest stable mono (5.0 on ubuntu repositories)?

Thank you,
Comment 2 Toshko Andreev 2017-07-06 15:46:41 UTC
Our solution was to work around it, we ended up using Apache's mod_proxy and a custom .exe that uses HttpListener. We do still get "End of file found: read_data failed" and "Command stream corrupted, last command was -1" but mono_server4 doesn't hang anymore.

As far as I can tell logrotate is also partly to blame.
Comment 3 Ludovic Henry 2017-07-06 18:27:11 UTC
Thank you for your feedback! I am marking this bug as resolved, but if you see fit, please fill up a bug for the other two exceptions you are witnessing. This might in fact be due to logrotate which move the file without synchronising with Mono.