Bug 397686

Summary:	Using QtCurve menubar in Qt programs causes them to freeze
Product:	[Frameworks and Libraries] QtCurve	Reporter:	Pierce <pierceagriffiths>
Component:	qt5	Assignee:	Yichao Yu <yyc1992>
Status:	RESOLVED DOWNSTREAM
Severity:	crash	CC:	hein
Priority:	NOR
Version First Reported In:	unspecified
Target Milestone:	---
Platform:	Debian testing
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Pierce 2018-08-20 21:15:05 UTC

Using the menubar in a Qt application will cause the entire application to freeze, and has sometimes prevented me from switching to my terminal emulator (or any other application) to kill it (killing from a TTY unfreezes everything). I have encountered this issue with Okular, Dolphin, Kpatience, and KolourPaint. It only occurs in Qt based applications, as I have not encountered the problem when using Firefox, XFCEterm, or LibreOffice writer.

Steps to reproduce:
1. Open a Qt program such as Dolphin or Okular
2. Click on a menubar category (e.g. File, Edit, View, etc.)
3. Mouse over items within the category/switch to other categories in the menubar

Actual results: the program freezes and sometimes can only be killed by switching to a TTY

Expected results: programs should not crash

Comment 1 Pierce 2018-08-21 13:36:52 UTC

(In reply to Pierce from comment #0)
> Using the menubar in a Qt application will cause the entire application to
> freeze, and has sometimes prevented me from switching to my terminal
> emulator (or any other application) to kill it (killing from a TTY unfreezes
> everything). I have encountered this issue with Okular, Dolphin, Kpatience,
> and KolourPaint. It only occurs in Qt based applications, as I have not
> encountered the problem when using Firefox, XFCEterm, or LibreOffice writer.
> 
> Steps to reproduce:
> 1. Open a Qt program such as Dolphin or Okular
> 2. Click on a menubar category (e.g. File, Edit, View, etc.)
> 3. Mouse over items within the category/switch to other categories in the
> menubar
> 
> Actual results: the program freezes and sometimes can only be killed by
> switching to a TTY
> 
> Expected results: programs should not crash

I forgot to put this in the description, but the bug only occurs while QtCurve is set as the current widget style in the Application Style section of the System Preferences. I have not experienced any crashes since switching to the Breeze widget style.

Comment 2 Pierce 2018-08-22 13:30:13 UTC

I have been unable to reproduce the bug after installing today's (22 August 2018) updates to qtcurve packages.

Comment 3 Christoph Feck 2018-08-22 14:13:20 UTC

Nothing was changed in QtCurve since months. If a recent update fixed something, it was a downstream issue.