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Please see this stack trace: https://tc-oss.intelliplan.net/viewLog.html?buildId=111&buildTypeId=Suave_BuildIt&tab=buildLog or in TL;DR mode:
[13:45:59][Step 2/3] Shutting down finalizer thread timed out.
[13:45:59][Step 2/3] Bad call to mono_mutex_lock result 22
[13:45:59][Step 2/3] * Assertion at gc.c:1424, condition `ret == 0' not met
Log in with guest/guest if you want to see all build parameters to reproduce the error.
Here's a possibly related bug https://github.com/SuaveIO/suave/issues/94; it might be zlib interop corrupting some runtime state, as these happen together.
This commit: 2d346db7e464347fc3bcdd437342e8bf089279a0 in https://github.com/SuaveIO/suave/commit/2d346db7e464347fc3bcdd437342e8bf089279a0 reproduces the problem most the times.
The link above to the CI server is for 3.2.8, x64 CentOS 6.5.
I can also reproduce it on my mac, with 3.4.0, OS X v10.8.5.
Expected outcome: no crash in GC.
Background on suave: a multi-threaded async web server in F# aiming to be cross-platform. If you want to run the tests yourself, just start the code that compiles to a CLR executable from https://github.com/SuaveIO/suave/tree/master/Tests.
Not getting this with latest mono anymore.