Re: USER/GDI Objects leak with (XWin.exe) Cygwin/X X Server Verion 1.7.6, Build Date 2010-03-18

[Amal Khailtash <akhailtash at yahoo dot com>]

Jon,

Thanks for looking into this.  Yes, it seems this problem shows up for some applications.  gnome-terminal
seems to behave better.  But konsole and my specific TCL-based application (modelsim) seem to suffer
from this.

The problem is even if I quit the troublesome application, resources are not released and that tells me
the leak is somewhere in the core X server and not the application, but somehow only shows up for those.

Some of the applications that I found that show this leak are:

  * modelsim
  * konsole
  * kfontview
  * kate

It seems KDE-based apps are the worst.  The problem is not as severe in gnome-based applications.
But I can see that, even in those, not all resources are released either!

Another not is that even Xming suffers from this same problem.  I assume most of the source code is
shared between XWin and Xming.

Cheers,-- Amal



----- Original Message ----
From: Jon TURNEY <jon.turney@dronecode.org.uk>
To: cygwin-xfree@cygwin.com
Cc: akhailtash@yahoo.com
Sent: Sun, April 18, 2010 3:46:42 PM
Subject: Re: USER/GDI Objects leak with (XWin.exe) Cygwin/X X Server Verion 1.7.6, Build Date 2010-03-18

On 06/04/2010 20:05, Amal Khailtash wrote:
> Click on Session menu and while the menu is open, move to Edit, then View, Bookmarks,
> Settings and Help and click outside to withdraw menu:
> 
> Image Name    User Objects    GDI Objects
> XWin.exe        39                  79
> 
> Click on any menu item and while the menu is open and move cursor to other menu items
> a number of (20) times:
> 
> Image Name    User Objects    GDI Objects
> XWin.exe        241                 483
> 
> Keep doing this and you will see the allocated objects keeps increasing and increasing and
> they are never released even if I close my Konsole window!

Thanks for the clear reproduction steps.   With these, I can reproduce this problem.

According to the GdiUsage tool this seems to be a GDI bitmap handle being leaked.   Unfortunately GdiUsage seems to have rusted a bit and doesn't produce useful backtraces (and may well not be able to backtrace a cygwin executable, anyhow) so locating exactly where the leak is coming from is going to be a bit tricky...

The one thing I notice is that other applications with menus don't seem to show this problem.  The konsole I was testing with is relatively recent and has menus with rounded corners, I wonder if that is somehow related to the problem?

-- Jon TURNEY
Volunteer Cygwin/X X Server maintainer



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