[Development] Why are qtbase integrations taking so long?

[Thiago Macieira]

qtbase integrations used to take around 3 hours as recently as two weeks ago.

In the past week, I've caught several integrations lasting more than 6 hours. 
The one currently running is integrating a single commit and has been running 
for 6h30. I've seen one for 12 hours.

Is this a timeout not caught by the coordinator?

http://testresults.qt.io/ci/status/ says that it is in state "monitor-jenkins-
build" and "build_attempt: 6". For attempt 5, the only stage not to be at 
SUCCESS was linux-g++_developer-build_qtnamespace_qtlibinfix_RHEL65_x64. The 
same for attempts 3 and 4.
-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center