Loading...

XML

Word

Printable

Details

Type: Bug
Resolution: Unresolved
Priority: P1: Critical
Fix Version/s: None
Affects Version/s: 6.11.0 FF
Component/s: GUI: Accessibility (a11y)
Labels:
None
Environment:
Debian testing, qtbase self-compiled from git dev as of commit e0130876ba376faf681b80d4a7dbb20a5e3c3bdb

Platform/s:

Linux/Wayland
Commits:
99ad6a51a (dev), 5380da9cc (6.10)

Description

This report is based on an earlier discussion in the KDE a11y matrix room.

When trying to retrieve all properties for one of the AT-SPI interfaces using the "GetAll" method of the "org.freedesktop.DBus.Properties" interface, this results in the Qt app that gets queried to crash.

Sample steps to reproduce:

1) Run the qtbase spinboxes example:

$ ./examples/widgets/widgets/spinboxes/spinboxes

2) Identify the AT-SPI bus address to use in the next commands:

$ busctl --user call org.a11y.Bus /org/a11y/bus org.a11y.Bus GetAddress
s "unix:path=/run/user/1000/at-spi/bus_1,guid=e4226c4804daa306ae987158683e6ebf"

3) Identify bus name for the spinboxes app:

$ busctl --address="unix:path=/run/user/1000/at-spi/bus_1,guid=e4226c4804daa306ae987158683e6ebf" list | grep spinboxes
:1.91                   2188539 spinboxes       michi :1.91      user@1000.service -       -

4) Query available interfaces of the root object:

 $ busctl call --address="unix:path=/run/user/1000/at-spi/bus_1,guid=e4226c4804daa306ae987158683e6ebf" ':1.91' '/org/a11y/atspi/accessible/root' 'org.a11y.atspi.Accessible' 'GetInterfaces'
as 2 "org.a11y.atspi.Accessible" "org.a11y.atspi.Application"

5) Call the GetProperties method for the Application interface:

$ busctl call --address="unix:path=/run/user/1000/at-spi/bus_1,guid=e4226c4804daa306ae987158683e6ebf" ':1.91' '/org/a11y/atspi/accessible/root' 'org.freedesktop.DBus.Properties' 'GetAll' 's' 'org.a11y.atspi.Application'
Call failed: Message recipient disconnected from message bus without replying

Actual Result:
No properties are returned, but the app crashes with this on stderr:

ASSERT failure in QList::at: "index out of range", file /home/michi/development/git/qt5/qtbase/src/corelib/tools/qlist.h, line 505
Aborted (core dumped)