Freeze on nested eventloops (QFileDialog::getOpen*)

[Andreas Hartmetz]

On Sunday 14 June 2015 15:00:57 Milian Wolff wrote:
> Hey all,
> 
> in massif-visualizer's framework branch, and now also kate, I
> sometimes notice GUI lockups when I try to open files via Ctrl + O.
> The backtraces look like the following:
> 
> https://paste.kde.org/pbzhkgx8r
> 
> Any idea what might be going on here? Is it not a good idea to mix
> system compiled KF5-based stuff (e.g. KDEPlatformTheme.so) with
> kdesrc-build compiled KF5 libraries (/home/milian/projects/kf5/*)?
> 
> The applications do not recover from this lockup.
> 
I recently got the apparently same hang in Kate twice in one day. The 
application froze while IIRC not using CPU cycles and didn't recover. I 
did not attach gdb. To the best of my knowledge, everything from qtbase 
up (5.5 branch) is self compiled so there is no mixing with distro 
provided libraries.
I have checked "info shared" in gdb and found nothing Qt related coming 
from /usr. This is now a few days after the hangs so there is a small 
probability that something changed.