Flaky tests/auto/other/qobjectrace crashes on multiple platforms

agent:2019/03/19 23:16:13 build.go:449: Executing instruction 675 of 912 - RunQtUnitTest
agent:2019/03/19 23:16:13 runner.go:72: Generating test results with TESTARGS=-o C:\Users\qt\work\testresults\tests\auto\other\qobjectrace934960483,xml -o -,txt
agent:2019/03/19 23:16:13 build.go:314: [c:\users\qt\MSVC2015.bat jom check] 900 900
agent:2019/03/19 23:16:13 build.go:192: 
agent:2019/03/19 23:16:13 build.go:192: C:\Users\qt\work\qt\qtbase\tests\auto\other\qobjectrace>call "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat" x86 10.0.14393.0  
agent:2019/03/19 23:16:14 build.go:192: 
agent:2019/03/19 23:16:14 build.go:192: jom 1.1.2 - empower your cores
agent:2019/03/19 23:16:14 build.go:192: 
agent:2019/03/19 23:16:14 build.go:192: 	C:\Utils\Jom\jom.exe -f Makefile.Release check
agent:2019/03/19 23:16:14 build.go:192: 	call C:\Users\qt\work\qt\qtbase\tests\auto\other\qobjectrace\target_wrapper.bat C:\Utils\winrtrunner\winrtrunner.exe release\qobjectrace.exe -o C:\Users\qt\work\testresults\tests\auto\other\qobjectrace934960483,xml -o -,txt
agent:2019/03/19 23:16:14 build.go:192: qt.winrtrunner: Using the Appx profile.
agent:2019/03/19 23:16:17 build.go:192: qt.winrtrunner: App started with process ID 4980
agent:2019/03/19 23:16:47 build.go:192: qt.winrtrunner: App exited with code 5
agent:2019/03/19 23:16:47 build.go:192: ********* Start testing of tst_QObjectRace *********
agent:2019/03/19 23:16:47 build.go:192: Config: Using QtTest library 5.14.0, Qt 5.14.0 (x86_64-little_endian-llp64 static release build; by MSVC 2015)
agent:2019/03/19 23:16:47 build.go:192: PASS   : tst_QObjectRace::initTestCase()
agent:2019/03/19 23:16:47 build.go:192: PASS   : tst_QObjectRace::moveToThreadRace()
agent:2019/03/19 23:16:47 build.go:192: PASS   : tst_QObjectRace::destroyRace()
agent:2019/03/19 23:16:47 build.go:192: jom: C:\Users\qt\work\qt\qtbase\tests\auto\other\qobjectrace\Makefile.Release [check] Error 5
agent:2019/03/19 23:16:47 build.go:192: jom: C:\Users\qt\work\qt\qtbase\tests\auto\other\qobjectrace\Makefile [release-check] Error 2
agent:2019/03/19 23:16:47 build.go:236: Process finished with error: exit status 2
agent:2019/03/19 23:16:47 build.go:195: Error reading from stdout/err: exit status 2
agent:2019/03/19 23:16:47 build.go:436: Executing scheduled instruction 1 of 2 - Upload all core dumps if there are some