[konsole] [Bug 470563] New: konsole bell sound blows up memory usage of pipewire-pulse

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=470563

            Bug ID: 470563
           Summary: konsole bell sound blows up memory usage of
                    pipewire-pulse
    Classification: Applications
           Product: konsole
           Version: 22.12.3
          Platform: Kubuntu
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: konsole-devel at kde.org
          Reporter: dmattes at gmx.de
  Target Milestone: ---

SUMMARY

If konsole plays bell sounds in quick succession, the memory usage of the
pipewire-pulse background process grows without limits. The memory usage does
not go down over time. The pipewire-pulse process has to be restarted to
reclaim the memory.

STEPS TO REPRODUCE

1. Open konsole.
2. Open the Settings -> Configure Notifications ... dialog. Select "Bell in
focused session" from the list of events. Check "Play a sound" and select an
existing sound file. Apply.
3. Press Ctrl+Esc to open the "System Activity" monitor - or any other too that
is able to show the memory consumption of background processes.
4. In the console window, press and hold backspace key for a few seconds to
generate a quick succession of bell sounds.
5. Watch how the memory consumption of pipewire-pulse behaves.

OBSERVED RESULT

The memory consumption grows to several hundred megabytes and stays high
afterwards. When releasing the key, the memory consumption goes down a little
bit but stays high. This behavior may also be caused by other applications that
play sound. When I play audio using audacious or watching a video in firefox,
the memory consumption of pipewire-pulse stays very low (a few megabytes). When
I discovered the problem, pipewire-pulse permanently occupied over 600 MiB.
After a reboot, the memory consumption was on the normal level of a few
megabytes.

EXPECTED RESULT

I would expect that the memory consumption grows a bit while playing the
possibly overlapping bell sounds and then
goes down to a few megabytes after the internal buffers have been freed.

SOFTWARE/OS VERSIONS
Linux kernel: 6.2.0-20-generic (64-bit)
KDE Plasma Version: 5.27.5 (backports on Kubuntu 23.04)
KDE Frameworks Version: 5.106.0
Qt Version: 5.15.8
pipewire/pipewire-pulse Version: 0.3.65-3
libpulse0 Version: 1:16.1+dfsg1-2ubuntu3

ADDITIONAL INFORMATION

The bug may be anywhere between konsole and pipewire-pulse. I filed this bug
under konsole because it can be reproduced in the konsole window and I couldn't
identify other applications that let the memory consumption grow that much.

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