Damn, I was really hoping this would be identical to the List Perf Tests failure from yesterday (chromium:663759), but this looks like a hang instead of a corrupt checkout.

The problem is that I (nor any other infra person, as far as I know) has any idea what the List Perf Tests step does. I'm going to assign to martiniss@, who might/should know the most, and cc andybons@, as shared responsibility for a script like this is a thing he should be aware of.

Finally, I'm going to CC katthomas@ just as an FYI of another failure mode, because this build turned purple (infra failure) because it was killed by the buildbot master after 2400s of no logging output from the slave. This is why we need per-step timeouts, so that the recipe can kill steps and mark them red before the master kills the whole build and marks it purple. martiniss@, please also add a timeout to this step during your investigation.

In the mean time, I've moved the b/build/slave/buildername/build directory to .../build.investigate, and also b/c/b/buildername to b/c/b/buildername.investigate to effectively clobber the bot and leave the directory behind for investigation. Hopefully the "clobber" will help.

Seems fixed? reopen if needed.