Bug#842408: qt4-designer: SIGSEGV with designer-qt4

[Antti Järvinen <antti.jarvinen@katiska.org>]

Package: qt4-designer
Version: 4:4.8.7+dfsg-9
Severity: grave
Justification: renders package unusable

Dear Maintainer,

I suspect this bug is due to malfunction inside libkio5 but I'm 
reporting it against qt4-designer because that is the way I can produce 
the bug every time. 

Initial setup is this:
 - debian testing up to date.
 - $HOME is mounted via nfs. This may have something to do with 
   the issue because previously I've had sometimes issues with
   KDE-related parts while having $HOME as network file system. 
   While having problems there, the error situation always is
   "too many open files" e.g. it seems like something in KDE is
   leaking file descriptors while $HOME is mounted via nfs.
 - run "gdb designer-qt4" or just plain "designer-qt4" is less details
   about crash are wanted.
 - select "open" from "file" menu

->
BFD: reopening /lib/x86_64-linux-gnu/libdbus-1.so.3: Too many open files in system

Can't read data for section '.eh_frame' in file '/lib/x86_64-linux-gnu/libdbus-1.so.3'
warning: unable to open /proc file '/proc/3344/status'

Thread 1 received signal SIGSEGV, Segmentation fault.
0x00007fffeae16c39 in KFileDialog::KFileDialog (this=0x7fffffffd450, 
    startDir=..., filter=..., parent=<optimized out>, 
    customWidget=<unavailable>) at ./kio/kfile/kfiledialog.cpp:266


I'll follow-up to this post and attach the full gdb log of the process 
crashing if that helps at all.

-- System Information:
Debian Release: stretch/sid
  APT prefers testing-debug
  APT policy: (500, 'testing-debug'), (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.3.0-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=fi_FI.UTF-8, LC_CTYPE=fi_FI.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages qt4-designer depends on:
ii  libc6            2.24-5
ii  libgcc1          1:6.2.0-9
ii  libqt4-designer  4:4.8.7+dfsg-9
ii  libqt4-network   4:4.8.7+dfsg-9
ii  libqt4-xml       4:4.8.7+dfsg-9
ii  libqtcore4       4:4.8.7+dfsg-9
ii  libqtgui4        4:4.8.7+dfsg-9
ii  libstdc++6       6.2.0-9
ii  qtchooser        58-gfab25f1-1

Versions of packages qt4-designer recommends:
ii  libqt4-dev  4:4.8.7+dfsg-9

qt4-designer suggests no packages.

-- no debconf information