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If you look at our Intel64 Linux Coop lane, every single build is failing with 370+ test failures:
Some of these are program exit or thread exit related ( https://bugzilla.xamarin.com/show_bug.cgi?id=55989 ) however, most of them are failing in System.Web. Aleksey looked and most of them appear to be failing with
IOException: Sharing violation on path /tmp/builder-temp-aspnet-0/d0199327/Resources.Common.resources
The failures are extremely consistent from run to run. We are not seeing this error on other configurations.
Fixed on master by https://github.com/mono/mono/commit/6d88df8d824a0813093ec0e7ef586cd62920466a (specifically by https://github.com/mono/mono/commit/2b5d0fe422ed485a65df469329782d6744dd5fe5)
Fixed on 2017-06 by https://github.com/mono/mono/commit/0a3ea22257db11cae5274cc62474cb998dc95778
In each of those tests, mono was invoking a process to run resgen.exe (which is another managed program) which was failing on shutdown due to a coop mutex in mono_w32handle_unref that was already destroyed by an earlier shutdown step.