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Looking through my CI, there are a bunch of runtime tests that sometimes hang during test execution.
I looked back about a month, it may be going on for longer though.
Run this in mono/tests to reproduce (this one uses finalizer-thread.exe):
> while [ $? -eq 0 ]; do ./test-driver 'MONO_PATH=../../mcs/class/lib/net_4_x MONO_CFG_DIR=../../runtime/etc ../../doltlibtool --mode=execute ../../mono/mini/mono' finalizer-thread.exe "" dump-output --config tests-config --optimize=all --debug; done
Ubuntu 14.04, amd64
While there are multiple tests that hang, I suspect the root cause is the same.
This seems fixed, those tests pass consistently on master now.