The cmp-baseline builds have started failing with the following error:

 Binary files /opt/mach5/mesos/work_dir/slaves/0c72054a-24ab-4dbb-944f-97f9341a1b96-S8340/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/3febfa93-14de-481f-b9dc-34b16169921c/runs/4e44cd73-450b-4dba-b13b-6506f1b6c03a/workspace/build/linux-x64-cmp-baseline/images/jdk/./lib/server/classes_nocoops.jsa and /opt/mach5/mesos/work_dir/slaves/0c72054a-24ab-4dbb-944f-97f9341a1b96-S8340/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/3febfa93-14de-481f-b9dc-34b16169921c/runs/4e44cd73-450b-4dba-b13b-6506f1b6c03a/workspace/build/compare-build/linux-x64-cmp-baseline/images/jdk/./lib/server/classes_nocoops.jsa differ

In the first failing build, I found this change, JDK-8296344, which seems like the most likely culprit. I haven't bisected to prove it though.