Building core-image-minimal qemux86 on an ubuntu 14.04 machine gives the following error:
NOTE: Logging error 2: {'pathname': '/big/src/intel/myBugs/poky/bitbake/lib/bb/event.py', 'level': 2, 'message': "Execution of event handler 'toaster_buildhistory_dump' failed", 'lineno': 112, 'build': <Build: 4 Project object core-image-minimal>}
ERROR: Execution of event handler 'toaster_buildhistory_dump' failed
Traceback (most recent call last):
  File "/big/src/intel/myBugs/poky/meta/classes/toaster.bbclass", line 268, in toaster_buildhistory_dump(e=<bb.event.BuildCompleted object at 0x7f40477fb748>):
                         line = line.rstrip(";")
    >                    psize, px = line.split("\t")
                         punit, pname = px.split(" ")
ValueError: too many values to unpack (expected 2)

---
and toaster stalls out.

---