qmltestrunner::AnimatedImage::test_crashRaceCondition_replyFinished() is flaky on macOS 10.13

agent:2019/02/25 11:53:56 build.go:662: 
agent:2019/02/25 11:53:56 build.go:454: Executing instruction 135 of 196 - RunQtUnitTest
agent:2019/02/25 11:53:56 runner.go:72: Generating test results with TESTARGS=-o /Users/qt/work/testresults/tests/auto/qmltest/animatedimage187589145,xml -o -,txt
agent:2019/02/25 11:53:56 build.go:319: [make check -j1] 900 900
agent:2019/02/25 11:53:56 build.go:197: /Users/qt/work/install/bin/qmltestrunner
agent:2019/02/25 11:53:57 build.go:197: ********* Start testing of qmltestrunner *********
agent:2019/02/25 11:53:57 build.go:197: Config: Using QtTest library 5.12.2, Qt 5.12.2 (x86_64-little_endian-lp64 shared (dynamic) release build; by Clang 10.0.0 (clang-1000.11.45.5) (Apple))
agent:2019/02/25 11:53:57 build.go:197: PASS   : qmltestrunner::AnimatedImage::initTestCase()
agent:2019/02/25 11:53:57 build.go:197: PASS   : qmltestrunner::AnimatedImage::test_clearSource()
agent:2019/02/25 11:53:57 build.go:197: QDEBUG : qmltestrunner::AnimatedImage::test_clearSource() qml: Status:  0
agent:2019/02/25 11:53:57 build.go:197: QDEBUG : qmltestrunner::AnimatedImage::test_clearSource() qml: Readystate 4
agent:2019/02/25 11:53:57 build.go:197: QWARN  : qmltestrunner::AnimatedImage::test_crashRaceCondition_replyFinished() file:///Users/qt/work/qt/qtdeclarative/tests/auto/qmltest/animatedimage/tst_animatedimage.qml:142:17: QML AnimatedImage: Error Reading Animated Image File 
agent:2019/02/25 11:54:05 build.go:197: FAIL!  : qmltestrunner::AnimatedImage::test_crashRaceCondition_replyFinished() property active
agent:2019/02/25 11:54:05 build.go:197:    Actual   (): true
agent:2019/02/25 11:54:05 build.go:197:    Expected (): false
agent:2019/02/25 11:54:05 build.go:197:    Loc: [/Users/qt/work/qt/qtdeclarative/tests/auto/qmltest/animatedimage/tst_animatedimage.qml(269)]
agent:2019/02/25 11:54:05 build.go:197: PASS   : qmltestrunner::AnimatedImage::test_imageSource(local)
agent:2019/02/25 11:54:05 build.go:197: PASS   : qmltestrunner::AnimatedImage::test_imageSource(local not found)
agent:2019/02/25 11:54:05 build.go:197: SKIP   : qmltestrunner::AnimatedImage::test_imageSource(remote) Remote solution not yet complete
agent:2019/02/25 11:54:05 build.go:197:    Loc: [/Users/qt/work/qt/qtdeclarative/tests/auto/qmltest/animatedimage/tst_animatedimage.qml(210)]
agent:2019/02/25 11:54:05 build.go:197: PASS   : qmltestrunner::AnimatedImage::test_noSource()
agent:2019/02/25 11:54:05 build.go:197: PASS   : qmltestrunner::AnimatedImage::test_resized()
agent:2019/02/25 11:54:05 build.go:197: PASS   : qmltestrunner::AnimatedImage::test_smooth()
agent:2019/02/25 11:54:05 build.go:197: PASS   : qmltestrunner::AnimatedImage::test_tileModes()
agent:2019/02/25 11:54:05 build.go:197: QWARN  : qmltestrunner::AnimatedImage::test_tileModes() file:///Users/qt/work/qt/qtdeclarative/tests/auto/qmltest/animatedimage/inline:1:21: QML AnimatedImage: Error Reading Animated Image File http://127.0.0.1:14445/stickman.gif
agent:2019/02/25 11:54:05 build.go:197: PASS   : qmltestrunner::AnimatedImage::cleanupTestCase()
agent:2019/02/25 11:54:05 build.go:197: Totals: 9 passed, 1 failed, 1 skipped, 0 blacklisted, 8017ms
agent:2019/02/25 11:54:05 build.go:197: ********* Finished testing of qmltestrunner *********
agent:2019/02/25 11:54:05 build.go:197: make: *** [check] Error 1
agent:2019/02/25 11:54:05 build.go:241: Process finished with error: exit status 2