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Steps to Reproduce
Coop, takes ~20mins:
Finishing much faster.
On which platforms did you notice this
[ ] macOS
Version Used: master
The test suite summary page says "00:18:36" and the xunit log says "1093.173s" (about 00:18:13). So the actual test run is taking a long time, not just shutdown (which is our usual culprit). So it's doing something pathological.
Note that we also build the coop lane as a checked build and run with thread and gc checks. (see ci/scripts/run-jenkins.sh where it mentions "checked-coop")
Runs in a reasonable amount of time on osx with
So checked build mode with coop is behaving pathologically.
Possibly it's collecting stack traces on each thread state transition and hitting contention around the