tst_customization::comboPopup() failed on Linux Ubuntu_16_04 (gcc-x86_64)

agent:2019/01/21 10:18:49 build.go:192: PASS   : tst_customization::override(Universal:Tumbler)
agent:2019/01/21 10:18:49 build.go:192: QFATAL : tst_customization::comboPopup() ASSERT: "accessibleAttached" in file /home/qt/work/qt/qtquickcontrols2/src/quicktemplates2/qquickcontrol.cpp, line 2257
agent:2019/01/21 10:18:49 build.go:192: FAIL!  : tst_customization::comboPopup() Received a fatal error.
agent:2019/01/21 10:18:49 build.go:192:    Loc: [Unknown file(0)]
agent:2019/01/21 10:18:49 build.go:192: Totals: 613 passed, 1 failed, 0 skipped, 0 blacklisted, 16687ms
agent:2019/01/21 10:18:49 build.go:192: ********* Finished testing of tst_customization *********
agent:2019/01/21 10:18:49 build.go:192: Makefile:339: recipe for target 'check' failed
agent:2019/01/21 10:18:49 build.go:192: make: *** [check] Aborted (core dumped)
agent:2019/01/21 10:18:49 build.go:236: Process finished with error: exit status 2
agent:2019/01/21 10:18:49 build.go:195: Error reading from stdout/err: exit status 2
agent:2019/01/21 10:19:09 runner.go:151: Re-running tests/auto/customization with TESTARGS=comboPopup
agent:2019/01/21 10:19:09 build.go:314: [make check -j1] 900 900
agent:2019/01/21 10:19:09 build.go:192: /home/qt/work/qt/qtquickcontrols2/tests/auto/customization/target_wrapper.sh  ./tst_customization -maxwarnings
agent:2019/01/21 10:19:09 build.go:192: [     0.000 D] qt.qpa.xcb TestNamespace::QXcbBasicConnection::initializeShm - Has MIT-SHM     : true
agent:2019/01/21 10:19:09 build.go:192: [     0.004 D] qt.qpa.xcb TestNamespace::QXcbBasicConnection::initializeShm - Has MIT-SHM FD  : true
agent:2019/01/21 10:19:09 build.go:192: [     0.016 D] qt.qpa.screen TestNamespace::QXcbScreen::QXcbScreen - Failed to parse EDID data for output "default" edid data:  ""
agent:2019/01/21 10:19:09 build.go:192: [     0.025 D] qt.qpa.screen TestNamespace::QXcbConnection::initializeScreens - adding QXcbScreen(0xc07e50, name="default", geometry=1440x900+0+0, availableGeometry=1375x876+65+24, devicePixelRatio=1.0, logicalDpi=QPair(96.0,96.0), physicalSize=381.0x238.0mm, screenNumber=0, virtualSize=1440x900 (1440.0x900.0mm), orientation=Qt::LandscapeOrientation, depth=24, refreshRate=0.0, root=25d, windowManagerName="Compiz") (Primary: true )
agent:2019/01/21 10:19:09 build.go:192: [     0.025 D] qt.qpa.screen TestNamespace::QXcbConnection::initializeScreens - primary output is "default"
agent:2019/01/21 10:19:09 build.go:192: [     0.096 D] qt.qpa.xcb TestNamespace::QXcbEventDispatcher::createEventDispatcher - using glib dispatcher
agent:2019/01/21 10:19:09 build.go:192: [     0.101 D] qt.qpa.input.methods.serialize TestNamespace::QIBusEngineDesc::deserializeFrom - QIBusEngineDesc::fromDBusArgument() "(sa{sv}ssssssssussssssss)"
agent:2019/01/21 10:19:09 build.go:192: [     0.101 D] qt.qpa.input.methods TestNamespace::QIBusPlatformInputContext::QIBusPlatformInputContext - socketWatcher.addPath "/home/qt/.config/ibus/bus/4d4cd6cd7b6c410e8079d2d33e3aa5dd-unix-0"
agent:2019/01/21 10:19:09 build.go:192: -maxwarnings needs an extra parameter with the amount of warnings
agent:2019/01/21 10:19:09 build.go:192: Makefile:339: recipe for target 'check' failed
agent:2019/01/21 10:19:09 build.go:192: make: *** [check] Error 1
agent:2019/01/21 10:19:09 build.go:236: Process finished with error: exit status 2
agent:2019/01/21 10:19:09 build.go:436: Executing scheduled instruction 1 of 2 - Upload all core dumps if there are some