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Type: Bug
Resolution: Unresolved
Priority: P2: Important
Fix Version/s: None
Affects Version/s: 5.9, 5.10, 5.12
Component/s: Core: Threads
Labels:
- autotest
- flaky
Environment:

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x86_64-little_endian-llp64 shared (dynamic) release build; by MSVC 2015
x86_64-little_endian-llp64 shared (dynamic) release build; by MSVC 2013
i386-little_endian-ilp32 shared (dynamic) release build; by MSVC 2015
RHEL 7.2
OS X 10.10
OpenSUSE 42.1
macOS 10.12

macOS 10.13

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x86_64-little_endian-llp64 shared (dynamic) release build; by MSVC 2015 x86_64-little_endian-llp64 shared (dynamic) release build; by MSVC 2013 i386-little_endian-ilp32 shared (dynamic) release build; by MSVC 2015 RHEL 7.2 OS X 10.10 OpenSUSE 42.1 macOS 10.12 macOS 10.13

Platform/s:

macOS

This one was seen failing recently on 5.9 (http://testresults.qt.io/coin/integration/qt/qtbase/tasks/1486486753 / https://codereview.qt-project.org/#/q/24e5bca5b8a20ba7c4d2bdf05d5ec6cda1897b6f,n,z) and dev (http://testresults.qt.io/coin/integration/qt/qtbase/tasks/1486633746 / https://codereview.qt-project.org/#/q/420dbb2b46a656a7b5d876758208607a116a7f81,n,z):

FAIL!  : tst_QSemaphore::tryAcquireWithTimeout(0.2s) 'qAbs(a1-e1) < fuzz' returned FALSE. ((time.elapsed()=260) is more than 60 milliseconds different from (timeout=200))
 tst_qsemaphore.cpp(235) : failure location

One of two re-runs succeeded.

macOS 10.12 failed this test with 2s timeout:
http://testresults.qt.io:8080/coin/api/results/qt/qtbase/40361613a3d455fcdbcc2a31c3217b22a1bb0bd1/MacOSMacOS_10_12x86_64MacOSMacOS_10_12x86_64Clangqtci-macos-10.12-x86_64-8-0e4188DebugAndRelease_Release/7ca30f915833d953146007e71743147e3e719500/test_1495776328/testlog.txt.gz

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For Gerrit Dashboard: QTBUG-58745
#	Subject	Branch	Project	Status	CR	V
185102,2	Blacklist tst_QSemaphore::tryAcquireWithTimeout(0.2s) on Windows	5.9	qt/qtbase	Status: MERGED	+2	0
188852,2	Blacklist also tst_QSemaphore::tryAcquireWithTimeout(2s)	5.9	qt/qtbase	Status: MERGED	+2	0
191566,5	Switch QSemaphore::tryAcquire to using QDeadlineTimer	5.9	qt/qtbase	Status: MERGED	+2	0
192452,3	Blacklist tst_qsemaphore on macOS 10.12	5.9	qt/qtbase	Status: MERGED	+2	0
195619,2	Extend blacklisting of tst_QSemaphore	5.9	qt/qtbase	Status: MERGED	+2	0
231067,2	Extend blacklisting of QSemaphore tests to macOS 10.13	dev	qt/qtbase	Status: MERGED	+2	0