[Konsole-devel] [konsole] [Bug 362197] New: Scrollback buffer loses data when it grows large enough

[Ruslan Kabatsayev via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=362197

            Bug ID: 362197
           Summary: Scrollback buffer loses data when it grows large
                    enough
           Product: konsole
           Version: 15.08.0
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: history
          Assignee: konsole-devel at kde.org
          Reporter: b7.10110111 at gmail.com

This can be reproduced with the following bash command:

i=0; while true; do echo "$i $i $i $i $i $i $i $i $i $i $i" >&2; i=$((i+1));
done

Once the numbers printed grow larger than about 2.1 million, Konsole starts
repeatedly printing a message to its parent terminal:

HistoryFile::add.seek: Invalid argument

And if you try to scroll back, you'll see empty lines right above the first
visible line. If you scroll more back, you'll get to the last line which has
successfully been appended to the scrollback buffer. Saving the scrollback also
gives this result, i.e. lines between the last screen and last successful
scrollback update are completely empty.

Reproducible: Always

Steps to Reproduce:
0. Set scrollback to Unlimited in Konsole settings
1. Run Konsole (from another terminal to see its stderr)
2. Run this command in bash inside Konsole session:
i=0; while true; do echo "$i $i $i $i $i $i $i $i $i $i $i" >&2; i=$((i+1));
done
3. Wait until numbers printed grow larger than about 2.1 million
4. Try to scroll back

Actual Results:  
Nearest scrollback lines get lost

Expected Results:  
The complete scrollback buffer should be saved correctly

This happens both in KDE 4.14 and KF5.

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