[Konsole-devel] [Bug 228037] New: Memory leak when using and closing many tabs

[Ariel Garcia]

https://bugs.kde.org/show_bug.cgi?id=228037

           Summary: Memory leak when using and closing many tabs
           Product: konsole
           Version: unspecified
          Platform: Debian testing
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: konsole-devel at kde.org
        ReportedBy: garcia at iwr.fzk.de


Version:           4.3.2 (using KDE 4.3.4)
OS:                Linux
Installed from:    Debian testing/unstable Packages

There is a memory leak in konsole which becomes apparent when using many
multiple tabs and closing them afterwards: the memory consumption grows!

The usecase is: i work with several (2-4) konsole windows, and open many (say 4
to 10) tabs in them. In most of the tabs i just start ssh sessions. Scroll
lines is set to a relatively high value: 50000.
These consoles/tabs stay open for hours-days.

Then:
- each time I close one tab the memory consumption increases! 
I've seen the RSS memory size going up from 160M to 208M when closing all minus
one open tabs.

- if in this situation i start and immediately close new tabs the memory
consumption stays unchanged.

- if in one of the new tabs i 'cat' a big text file (filling up the 50000 lines
of history buffer), the memory usage goes up (as expected)

- however if i now close the above tab (with the full history buffer) the
memory consumption stays unchanged

(After a fresh start of konsole, the memory usage (RES in top, RSS in ps) is
around 20M)

For comparison the output of
   ps axf -eo pid,%mem,rsz,vsz,sz,state,stime,command | grep konsole
having one freshly started konsole (pid 26732) and another one which has been
running for 5 days and has seen many (~100?) open tabs and ssh sessions. BUT
both currently have only one tab open!

26732  2.2 17176  72616 18154 S 13:10 konsole
25406 29.1 225696 358052 89513 S Feb17 kdeinit4: konsole [kdeinit]


I would expect that the used scrollback buffers get freed when a tab is closed,
but most importantly the memory consumption shouldn't get up when closing
long-lived tabs!

Please feel free to suggest any other info i should provide/debugging i could
perform. Thanks for working on Konsole, it's great :-)


Debian package versions used (testing/unstable as of 2010-02-20):

ii  kdebase-runtime            4:4.3.4-2                  runtime components
from the official KDE 4 release
ii  kdelibs5                   4:4.3.4-1                  core libraries for
all KDE 4 applications
ii  konsole                    4:4.3.2-1                  X terminal emulator
for KDE 4
ii  libc6                      2.10.2-2                   GNU C Library: Shared
libraries
ii  libqt4-dbus                4:4.5.3-4                  Qt 4 D-Bus module
ii  libqtcore4                 4:4.5.3-4                  Qt 4 core module
ii  libqtgui4                  4:4.5.3-4                  Qt 4 GUI module
ii  libstdc++6                 4.4.2-9                    The GNU Standard C++
Library v3
ii  libx11-6                   2:1.3.3-1                  X11 client-side
library
ii  libxrender1                1:0.9.5-1                  X Rendering Extension
client library

Kernel: selfcompiled 2.6.32.7-grsec

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