Intermittent "Operation not permitted" when killing servo process during test-wpt

[jdm]

  ▶ ERROR [expected OK] /websockets/constructor/013.html
  └   → Traceback (most recent call last):
  File "/Users/servo/buildbot/slave/mac-rel-wpt/build/tests/wpt/harness/wptrunner/executors/base.py", line 149, in run_test
    result = self.do_test(test)
  File "/Users/servo/buildbot/slave/mac-rel-wpt/build/tests/wpt/harness/wptrunner/executors/executorservo.py", line 133, in do_test
    self.proc.kill()
  File "/Users/servo/buildbot/slave/mac-rel-wpt/build/python/_virtualenv/lib/python2.7/site-packages/mozprocess/processhandler.py", line 749, in kill
    self.proc.kill(sig=sig)
  File "/Users/servo/buildbot/slave/mac-rel-wpt/build/python/_virtualenv/lib/python2.7/site-packages/mozprocess/processhandler.py", line 165, in kill
    send_sig(signal.SIGTERM)
  File "/Users/servo/buildbot/slave/mac-rel-wpt/build/python/_virtualenv/lib/python2.7/site-packages/mozprocess/processhandler.py", line 152, in send_sig
    os.killpg(pid, sig)
OSError: [Errno 1] Operation not permitted

[samgiles]

Pretty sure I found a fix for this. PR incoming!

[samgiles]

Fix is upstream in mozprocess https://bugzilla.mozilla.org/show_bug.cgi?id=1329528.

Needs publish to PyPI

[samgiles]

This has been published to PyPI (0.25),
Looks like the fix should be picked up automatically \o/.

tests/wpt/harness/requirements_chrome.txt
1:mozprocess >= 0.19

tests/wpt/harness/requirements_firefox.txt
3:mozprocess >= 0.19

tests/wpt/harness/requirements_servo.txt
1:mozprocess >= 0.19

[nox]

@jdm Did the change ultimately land in our repo?

[dralley]

Bump

[jdm]

We have a more recent version of mozprocess in use now.