[konsole] [Bug 398865] New: writes to stdout stall after switching to a different screen

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=398865

            Bug ID: 398865
           Summary: writes to stdout stall after switching to a different
                    screen
           Product: konsole
           Version: 18.08.1
          Platform: Gentoo Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: konsole-devel at kde.org
          Reporter: kdebugs at nospam.kosztadani.me
  Target Milestone: ---

Note: this is mostly copied from my Gentoo bugreport at
https://bugs.gentoo.org/628996, but I confirmed that it still happens with
version 18.08.1

It seems that applications trying to write data to standard output running from
a 'konsole' terminal will stall if I switch to another screen (e.g. by pressing
Ctrl+Alt+F1).

As a demonstration I ran the following command in konsole:

( while true; do date; dd if=/dev/urandom bs=1k count=1k | od; sleep 1; done )
| tee /tmp/logfile

I left it running for about 5 seconds, than switched to another user for about
10-15 seconds, than back to the original user.

Now the output of 'grep CEST /tmp/logfile' is:

Sat Aug 26 22:07:16 CEST 2017
Sat Aug 26 22:07:17 CEST 2017
Sat Aug 26 22:07:18 CEST 2017
Sat Aug 26 22:07:20 CEST 2017
Sat Aug 26 22:07:21 CEST 2017
Sat Aug 26 22:07:22 CEST 2017
Sat Aug 26 22:07:24 CEST 2017
Sat Aug 26 22:07:38 CEST 2017
Sat Aug 26 22:07:39 CEST 2017
Sat Aug 26 22:07:41 CEST 2017
Sat Aug 26 22:07:42 CEST 2017
Sat Aug 26 22:07:43 CEST 2017

It can be clearly seen that between 22:07:24 and 22:07:38, the 'date' command
was not executed. (I assume that The 'dd' command was waiting for I/O as
Konsole was not processing writes to stdout.)

I think this is a bug in Konsole because I don't experience this issue with
xfce4-terminal.

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