About 50% of build jobs are [failing](https://integration.wikimedia.org/ci/job/mediawiki-extensions-qunit/24567/console) for the mediawiki/core test job [mediawiki-extensions-qunit](https://integration.wikimedia.org/ci/job/mediawiki-extensions-qunit/) due to a Karma related timeout.
Interestingly enough, all of the slaves which are consistently failing are odd numbered slaves:
- integration-slave-trusty-1011
- integration-slave-trusty-1013
- integration-slave-trusty-1015
And those usually succeeding are even-numbered:
- integration-slave-trusty-1012
- integration-slave-trusty-1014
- integration-slave-trusty-1016
I only looked at the most recent 15 or so builds, so it's conceivable that this is just a coincidence, or it could mean that Jenkins has become sentient and is rebelling against us. Also, [mediawiki-core-qunit](https://integration.wikimedia.org/ci/job/mediawiki-core-qunit/) tests are fine on all of the same build slaves.
```
02:56:06 Running "karma:main" (karma) task
02:56:06 26 12 2015 02:56:06.827:INFO [karma]: Karma v0.13.10 server started at http://localhost:9876/
02:56:06 26 12 2015 02:56:06.870:INFO [launcher]: Starting browser Chrome
02:56:12 26 12 2015 02:56:12.424:INFO [Chromium 47.0.2526 (Ubuntu 0.0.0)]: Connected on socket x8rKNUuoFpv7cATqAAAA with id 64277732
02:57:12 26 12 2015 02:57:12.443:WARN [Chromium 47.0.2526 (Ubuntu 0.0.0)]: Disconnected (1 times), because no message in 60000 ms.
02:57:12 Chromium 47.0.2526 (Ubuntu 0.0.0): Executed 0 of 0 DISCONNECTED (1 min 0.018 secs / 0 secs)
02:57:12 Warning: Task "karma:main" failed. Use --force to continue.
02:57:12
02:57:12 Aborted due to warnings.
02:57:12 Build step 'Execute shell' marked build as failure
```