memory leak with gdk_fontset_load/gdk_font_unref while using XFree-4 libs

[Guillaume Cottenceau <gc mandrakesoft com>]

Hi,

I am developper for MandrakeSoft, who produces the Linux distribution
called Linux-Mandrake.

I had trouble with xmms, actually a memory leak that made it eat more than
150 Megabytes of memory after a long use.

After much investigation, I finally figured out where the problem comes
from, and the little program at the bottom can reproduce it:
gdk_font_unref seems to not release correctly the memory if it was created
with gdk_fontset_load; additionnally, it seems that the problem only
occurs when the prog is linked against X libraries from XFree-4 (does NOT
appear when the prog is linked against XFree-3).

I did not verify on current CVS if this bug seems to be fixed; however I
checked the archive of this ML and it seems that it was not reported
before.


-=-=-=-=-=-=-=-

#include <stdio.h>
#include <gtk/gtk.h>

void print_mem()
{
   FILE *stream_;
   char point[1000];
   char filen[100];
   char *f_,*g_;
   int t;

   t = getpid();
   sprintf(filen, "/proc/%d/status", t);

   if((stream_ = fopen(filen, "r")) == NULL)
     return;

   fread(point, 1, 1000, stream_);
   fclose(stream_);

   point[999] = '\0';
   f_ = (char *) strstr(point,"VmSize");
   if (!f_) return;
   g_ = (char *) strchr(f_, '\n');
   if (!g_) return;
   g_[1] = '\0';
   printf(f_);
}

int main(int argc, char **argv)
{
  GdkFont *font = NULL;
  int i;

  gtk_init(&argc, &argv);

  printf("Starting at:\t\t\t"); print_mem();

  for (i=0; i<200; i++)
    {
      font = gdk_font_load("-adobe-helvetica-bold-r-*-*-10-*");
      gdk_font_unref(font);
    }

  printf("After some font_load:\t\t"); print_mem();

  for (i=0; i<200; i++)
    {
      font = gdk_fontset_load("-adobe-helvetica-bold-r-*-*-10-*,*-r-*");
      gdk_font_unref(font);
    }

  printf("After some fontset_load:\t"); print_mem();
}


-=-=-=-=-=-=-=-

Output of this program on a Linux-Mandrake 7.2-beta machine is:

Starting at:                    VmSize:     4252 kB
After some font_load:           VmSize:     4252 kB
After some fontset_load:        VmSize:     4844 kB


Versions of progs we use:

gtk+-1.2.8
glib-1.2.8
XFree86-4.0.1
glibc-2.1.3
linux-2.2.17


-- 
Guillaume Cottenceau -- Distribution Developer for MandrakeSoft
http://www.mandrakesoft.com/~gc/