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Details

Type: Bug
Resolution: Done
Priority: P1: Critical
Fix Version/s: 6.0.0 Beta1
Affects Version/s: 5.11, 5.12.3
Component/s: Widgets: Widgets and Dialogs
Labels:
None

Platform/s:

Windows
Commits:
24a0303b9ed7d48c75c4567b93b327b731b2de3b

Description

We have sporadic crashes on multiple different Windows Machines relating to calling a function on a, presumably, null window object, taken from QAccessibleWidget::window().

We have spent some time trying to figure out what causes this, and the only semi-related issue is that having "Touch Keyboard and Handwriting Panel Service" enabled seems to cause this. This is speculation, but it has been a common theme.

We have multiple crash dumps and they all look exactly the same.

Crash reason:  EXCEPTION_ACCESS_VIOLATION_READ
Crash address: 0x8
Process uptime: 634 seconds


Thread 0 (crashed)
 0  Qt5Widgets.dll!QWidget::windowHandle() [qwidget.cpp : 2656 + 0x0]
 1  Qt5Widgets.dll!QAccessibleWidget::window() [qaccessiblewidget.cpp : 229 + 0x8]
 2  qwindows.dll + 0x5ed4b
 3  qwindows.dll + 0x57c98
 4  Qt5Widgets.dll!QWindowsStyle::eventFilter(QObject *,QEvent *) [qwindowsstyle.cpp : 150 + 0x19]
 5  0x223ad3d1af8
 6  Qt5Widgets.dll!QWindowsStyle::eventFilter(QObject *,QEvent *) [qwindowsstyle.cpp : 150 + 0x19]
 7  0x7ffb0000000c
 8  UIAutomationCore.dll + 0x1fd000
 9  Qt5Gui.dll!QAccessible::queryAccessibleInterface(QObject *) [qaccessible.cpp : 678 + 0x5]
10  qwindows.dll + 0x5d6f
11  0x7ffc1f900000
12  UIAutomationCore.dll + 0x183348
13  qwindows.dll + 0x57835
14  UIAutomationCore.dll + 0x44053
15  ntdll.dll + 0xd997
16  Qt5Widgets.dll!QAccessibleWidget::window() [qaccessiblewidget.cpp : 231 + 0x8]
17  0x223b21bb280
18  UIAutomationCore.dll + 0x41931
19  UIAutomationCore.dll + 0x2013c0
20  UIAutomationCore.dll + 0x40636
21  qwindows.dll + 0x157b60
22  UIAutomationCore.dll + 0x404dc
23  ucrtbase.dll + 0xca26
24  Qt5Core.dll!QMetaObject::Connection::~Connection() [qobject.cpp : 5121 + 0x5]
25  qwindows.dll + 0x560c7
26  Qt5Widgets.dll!QWidget::hasFocus() [qwidget.cpp : 6475 + 0x5]
27  Qt5Core.dll!QMetaObject::cast(QObject *) [qmetaobject.cpp : 357 + 0xd]

At this point, we have run out of options, short of compiling Qt ourselves without any accessibility features.