[Buildbot-devel] Dead job permanently yellow?

[Dan Kegel]

So... our buildbot got in that nasty state again where:
- the waterfall shows a builder as yellow
- clicking on the build shows it as yellow (with revision ??, since it
failed during git step)
- no buildslave is yellow, all are idle

Forcing a new build that then fails does leave the builder red, but
the old yellow job (on a different slave) is still there.
Restarting the master doesn't help.
Rebooting the slave doesn't help.

Everything is normal otherwise.   Even if I disable all other slaves, the
slave with the false yellow job still accepts new jobs properly.

I guess I can just ignore the problem, but it feels a little funny.

I think I triggered this by restarting the master while the slave was
in the middle of a git step.