qt5ct segfault on xfce de - slackware-current-64 multilib

UH10Y6 · 10-12-2020, 06:32 PM

Hello everyone,

When i try to run qt5ct with Xfce De i get a segfault for qt5ct.

Here is what i got.

Code:

Thread 1 "qt5ct" received signal SIGSEGV, Segmentation fault.
0x00007fffe9fcf22e in gdk_display_open ()
   from /usr/lib64/qt5/plugins/styles/../../../libgdk-x11-2.0.so.0
(gdb) bt
#0  0x00007fffe9fcf22e in gdk_display_open ()
    at /usr/lib64/qt5/plugins/styles/../../../libgdk-x11-2.0.so.0
#1  0x00007fffe9f9fac2 in gdk_display_open_default_libgtk_only ()
    at /usr/lib64/qt5/plugins/styles/../../../libgdk-x11-2.0.so.0
#2  0x00007fffea16d525 in gtk_init ()
    at /usr/lib64/qt5/plugins/styles/../../../libgtk-x11-2.0.so.0
#3  0x00007fffea4a54f5 in  () at /usr/lib64/qt5/plugins/styles/libqgtk2style.so
#4  0x00007fffea4a6a1f in  () at /usr/lib64/qt5/plugins/styles/libqgtk2style.so
#5  0x00007ffff7b2b60a in QStyleFactory::create(QString const&) ()
    at /usr/lib64/libQt5Widgets.so.5
#6  0x00000000004167a1 in  ()
#7  0x0000000000417f02 in  ()
#8  0x0000000000418d15 in  ()
#9  0x000000000041383b in  ()
#10 0x000000000041265c in  ()
#11 0x00007ffff66cde5b in __libc_start_main () at /lib64/libc.so.6

qt5ct does not segfault if i use icewm.

elcore · 10-12-2020, 11:27 PM

Does it still happen if you switch to Fusion style?

Note:
I compiled it on 64bit 14.2 with qt5-5.15.1 and it doesn't crash here, but I have no such thing as libqgtk2style.so
On my system there is only 1 plugin /usr/lib64/qt5/plugins/styles/libqt5ct-style.so (it's built without gtk support).

UH10Y6 · 10-15-2020, 07:33 PM

@elcore I did change the theme to bb10bright on icewm, then switched to xfce. Now works but, i get huge icons on qt5ct.

https://i.ibb.co/JRfxjph/qt5ct.png

EDIT: This seems to be just an issue with bb10bright and bb10dark. All the other themes work fine.

elcore · 10-15-2020, 11:06 PM

Went to double check the readme on github mirror.
Apparently, there is a list of relevant files installed by qt5ct package, with these descriptions:

Code:

qt5ct - Qt5 configuration tool
libqt5ct.so - qt5ct platform plugin
libqt5ct-style.so - qt5ct proxy style plugin

And since libqgtk2style.so is not listed there, it must be a part of another package.
Where this object came from and why it segfaults under xfce, I have no idea.
Possibly a qt5 package with gtk compatibility enabled includes this object, or some external package did that, I'm not sure.
But from previous experience, it's not the first time gtk compatibility in qt had bugs.