Windows/MSVC: tst_QWaitCondition frequently fails in the CI

C:\Users\qt\work\qt\qtbase\tests\auto\corelib\thread\qwaitcondition>call "C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\vcvarsall.bat" amd64  
 
 jom 1.1.0 - empower your cores
 
 	C:\utils\jom\jom.exe -f Makefile.Release check
 	(set QT_PLUGIN_PATH=C:\Users\qt\work\qt\qtbase\plugins) & (set PATH=C:\Users\qt\work\qt\qtbase\lib;%%PATH:)=^)%%) &  release\tst_qwaitcondition.exe -o c:\Users\qt\work\testresults\tests\auto\corelib\thread\qwaitcondition335308687,xml -o -,txt
 ********* Start testing of tst_QWaitCondition *********
 Config: Using QtTest library 5.6.0, Qt 5.6.0 (x86_64-little_endian-llp64 shared (dynamic) release build; by MSVC 2013)
 PASS   : tst_QWaitCondition::initTestCase()
 PASS   : tst_QWaitCondition::wait_QMutex()
 PASS   : tst_QWaitCondition::wait_QReadWriteLock()
 FAIL!  : tst_QWaitCondition::wakeOne() Compared values are not the same
    Actual   (exited): 1
    Expected (2)     : 2
 tst_qwaitcondition.cpp(603) : failure location
 QWARN  : tst_QWaitCondition::wakeOne() QThread: Destroyed while thread is still running
 QWARN  : tst_QWaitCondition::wakeOne() QThread: Destroyed while thread is still running
 QWARN  : tst_QWaitCondition::wakeOne() QWaitCondition: Destroyed while threads are still waiting
 FAIL!  : tst_QWaitCondition::wakeAll() Compared values are not the same
    Actual   (wake_Thread_2::count): 6
    Expected (ThreadCount)         : 4
 tst_qwaitcondition.cpp(662) : failure location
 QWARN  : tst_QWaitCondition::wakeAll() QThread: Destroyed while thread is still running
 QWARN  : tst_QWaitCondition::wakeAll() QThread: Destroyed while thread is still running
 QWARN  : tst_QWaitCondition::wakeAll() QThread: Destroyed while thread is still running
 QWARN  : tst_QWaitCondition::wakeAll() QThread: Destroyed while thread is still running
 QWARN  : tst_QWaitCondition::wakeAll() QWaitCondition: Destroyed while threads are still waiting
 PASS   : tst_QWaitCondition::wait_RaceCondition()
 PASS   : tst_QWaitCondition::cleanupTestCase()
 Totals: 5 passed, 2 failed, 0 skipped, 0 blacklisted
 ********* Finished testing of tst_QWaitCondition *********
 jom: C:\Users\qt\work\qt\qtbase\tests\auto\corelib\thread\qwaitcondition\Makefile.Release [check] Error 2
 jom: C:\Users\qt\work\qt\qtbase\tests\auto\corelib\thread\qwaitcondition\Makefile [release-check] Error 2
 
 agent:2015/11/25 13:54:46 build.go:200: Process finished with error: exit status 2
 agent:2015/11/25 13:54:46 build.go:149: Error reading from stderr: exit status 2
 agent:2015/11/25 13:54:46 build.go:149: Error reading from stdout: exit status 2
 agent:2015/11/25 13:54:46 build.go:261: [c:\users\qt\MSVC2013.bat jom check] 900 1200
 
 C:\Users\qt\work\qt\qtbase\tests\auto\corelib\thread\qwaitcondition>call "C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\vcvarsall.bat" amd64  
 
 jom 1.1.0 - empower your cores
 
 	C:\utils\jom\jom.exe -f Makefile.Release check
 	(set QT_PLUGIN_PATH=C:\Users\qt\work\qt\qtbase\plugins) & (set PATH=C:\Users\qt\work\qt\qtbase\lib;%%PATH:)=^)%%) &  release\tst_qwaitcondition.exe wakeOne
 ********* Start testing of tst_QWaitCondition *********
 Config: Using QtTest library 5.6.0, Qt 5.6.0 (x86_64-little_endian-llp64 shared (dynamic) release build; by MSVC 2013)
 PASS   : tst_QWaitCondition::initTestCase()
 FAIL!  : tst_QWaitCondition::wakeOne() Compared values are not the same
    Actual   (exited): 1
    Expected (2)     : 2
 tst_qwaitcondition.cpp(557) : failure location
 QWARN  : tst_QWaitCondition::wakeOne() QThread: Destroyed while thread is still running
 QWARN  : tst_QWaitCondition::wakeOne() QThread: Destroyed while thread is still running
 QWARN  : tst_QWaitCondition::wakeOne() QThread: Destroyed while thread is still running
 QWARN  : tst_QWaitCondition::wakeOne() QWaitCondition: Destroyed while threads are still waiting
 PASS   : tst_QWaitCondition::cleanupTestCase()
 Totals: 2 passed, 1 failed, 0 skipped, 0 blacklisted
 ********* Finished testing of tst_QWaitCondition *********
 jom: C:\Users\qt\work\qt\qtbase\tests\auto\corelib\thread\qwaitcondition\Makefile.Release [check] Error 1
 jom: C:\Users\qt\work\qt\qtbase\tests\auto\corelib\thread\qwaitcondition\Makefile [release-check] Error 2