FWIW, the buildbot-based jobs had to run on a different instance from the other ASAN tests as well (Ubuntu ASAN VM large 12.04 x64 opt test gtest). Greg, can you help find an owner for this?
If exclusions weren't such a pain to edit I would have included buildbot too, since it has failed 6 of the last 10 runs on mozilla-release (the last one where it's still running) from bug 1303927.
So it sounds like the ASAN gtests must run on a different instance type....do we know if that's the cause of the failures here for TaskCluster? Looping Joel in in case he has any idea as I do not know much about these tests.
given that these are hidden on treeherder for all branches for both buildbot/taskcluster, we should question the value of having these around- adding :decoder, :mccr8, :chmanchester as they are interested parties
I'm not familiar with gtests, so I don't know how useful it is to run them in ASan.
gtests are C++ unit tests. Running them under ASan sounds like a reasonable and desirable thing to do.