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Type: Bug
Resolution: Done
Priority: P1: Critical
Fix Version/s: 5.15.9, 6.3.0 Beta1, 6.4.0 Beta1
Affects Version/s: 5.15.7, 6.0.4, 6.1.3, 6.2.2, 6.3.0 Feature Freeze
Component/s: Core: Event loop
Labels:
- Reported_by_support_standard

Platform/s:

Windows
Commits:
d671bab0e3 (qt/qtbase/dev) d671bab0e3 (qt/tqtc-qtbase/dev) eb1103c02a (qt/qtbase/6.3) eb1103c02a (qt/tqtc-qtbase/6.3) 40c4b2ae44 (qt/qtbase/6.2) 40c4b2ae44 (qt/tqtc-qtbase/6.2) 07d065cbbe (qt/tqtc-qtbase/5.15)

Posted events get stuck when QCoreApplication::processEvents with QEventLoop::WaitForMoreEvents is used.

Way to reproduce:

Build and Run the attached example with affected Qt version (Qt 5.15.7 or Qt 6.2.2 for example)

The posted events seem to get stuck.

The last known good was Qt 5.14.2 where the event loop did not get stuck.

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qtbug99323.zip
20 Dec '21 12:31
0.8 kB
Tuukka Kettunen

resulted in

QTBUG-105719 [Reg 6.2.3 -> 6.2.4] Resizing QTableView header freezes application when using event loop from QMfcApp::pluginInstance()

Closed

QTBUG-119869 [Reg 5.15.8 -> 5.15.9]Dragging and changing row/column width/height of QTableWidget that is registered as ActiveX server causes MFC application stops responding

Closed

QTBUG-123498 [Reg 6.2.0 -> 6.2.11 (possibly 6.2.3->6.2.4)][ActiveQt] Resizing QTableView header inside a QAXCLASS freezes COM application

Closed

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For Gerrit Dashboard: QTBUG-99323
#	Subject	Branch	Project	Status	CR	V
387409,16	Win32: always allow the event loop to be woken up by posted events	dev	qt/qtbase	Status: MERGED	+2	0
388793,14	Add more tests for event dispatcher waking up	dev	qt/qtbase	Status: MERGED	+2	0
390885,2	Add more tests for event dispatcher waking up	6.3	qt/qtbase	Status: MERGED	+2	0
390886,2	Add more tests for event dispatcher waking up	6.2	qt/qtbase	Status: MERGED	+2	0
390888,2	Win32: always allow the event loop to be woken up by posted events	6.3	qt/qtbase	Status: MERGED	+2	0
390929,2	Win32: always allow the event loop to be woken up by posted events	6.2	qt/qtbase	Status: MERGED	+2	0
390937,2	Add more tests for event dispatcher waking up	tqtc/lts-5.15	qt/tqtc-qtbase	Status: ABANDONED	+2	0
390938,4	Win32: always allow the event loop to be woken up by posted events	tqtc/lts-5.15	qt/tqtc-qtbase	Status: MERGED	+2	0