Bug#879713: konsole: Konsole freezes for a minute when I press backspace in empty command line

[Wojciech Zabołotny <wzab@ise.pw.edu.pl>]

Package: konsole
Version: 4:16.12.0-4
Severity: important

Dear Maintainer,

Since a few days (or weeks?) I experience a strange behavior in konsole.
When editing a command line, if I press backspace too many times finally
trying to delete a character from an empty line, konsole freezes for ca.
one minute. The CPU load is almost 0%, other programs in the X windows
session work corectly. Even other konsole windows work correctly.

The interesting thing is that the problem occurs exactly ones in each
konsole window. It doesn't matter how many tabs I open. If I press backspace
in the empty command line for the first time in one of open tabs, the whole
window freezes. After it recovers, I can safely press backspace in all tabs
without any problems.
In fact it looks like konsole gets blocked trying to connect to certain not
running network service.

I don't know it it matters, but I use konsole in the MATE session.

Regards,
Wojtek

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

Kernel: Linux 4.13.0-1-amd64 (SMP w/8 CPU cores)
Locale: LANG=pl_PL.UTF-8, LC_CTYPE=pl_PL.UTF-8 (charmap=UTF-8), LANGUAGE= (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Init: systemd (via /run/systemd/system)

Versions of packages konsole depends on:
ii  kio                   5.37.0-2
ii  konsole-kpart         4:16.12.0-4
ii  libc6                 2.24-17
ii  libkf5completion5     5.37.0-2
ii  libkf5configcore5     5.37.0-2
ii  libkf5configgui5      5.37.0-2
ii  libkf5configwidgets5  5.37.0-2
ii  libkf5coreaddons5     5.37.0-2
ii  libkf5crash5          5.37.0-2
ii  libkf5dbusaddons5     5.37.0-2
ii  libkf5i18n5           5.37.0-2
ii  libkf5iconthemes5     5.37.0-2
ii  libkf5kiowidgets5     5.37.0-2
ii  libkf5notifyconfig5   5.37.0-2
ii  libkf5widgetsaddons5  5.37.0-2
ii  libkf5windowsystem5   5.37.0-2
ii  libkf5xmlgui5         5.37.0-2
ii  libqt5core5a          5.9.1+dfsg-9
ii  libqt5gui5            5.9.1+dfsg-9
ii  libqt5widgets5        5.9.1+dfsg-9
ii  libstdc++6            7.2.0-11

konsole recommends no packages.

konsole suggests no packages.

-- no debconf information