Seeing this in the logs....
INFO:root:Try printing formatted exception: None None None

which means we are calling PrintFormattedException at the wrong time or incorrectly. This could mean we are missing out on some error messages that could be useful.

Code being called at incorrect time or improperly:
https://cs.chromium.org/chromium/src/third_party/catapult/telemetry/telemetry/internal/util/exception_formatter.py?l=16

https://luci-logdog.appspot.com/v/?s=chrome%2Fbb%2Fchromium.perf%2FAndroid_Nexus7v2_Perf__3_%2F3596%2F%2B%2Frecipes%2Fsteps%2Fmemory.top_10_mobile_stress.reference%2F0%2Fstdout#