application crash after GTK2 upgrade

["Support GTK" <suppgtk gmail com>]

I am new to GTK. I have just started looking into a large piece of GTK2
application code which was developed and tested using GTK2-2.18.x (GTK2
version 2.18) on a proprietary system running Linux. 

 

I have upgraded GTK2 to version 2.22. I can't upgrade to 2.24 to 3.0 as
there are some issues with proprietary hardware which currently has drivers
that work only with older X server and some older packages. 

 

After the upgrade from 2.18 to 2.22 I see random crashes in the GTK2
application. I believe that the crashes are due to heap corruption. The gdb
stack trace shows the crash almost always to be inside a libc realloc
function. But the GTK functions from the code that are called before the
libc realloc crash vary.

 

I enabled MALLOC_CHECK_ and also enabled GTK_DEBUG. Below are the logs
(taken from stderr) after 3 random crashes. I have also used valgrind
without much success.

 

Appreciate any help in resolving this issue.

 

-------------------------

Crash 1 -

(App:3490): Gtk-CRITICAL **: IA__gtk_main_quit: assertion `main_loops !=
NULL' failed

**

Gdk:ERROR:gdkregion-generic.c:1110:miUnionNonO: assertion failed: (y1 < y2)

 

Crash 2 -

(App:5155): Pango-CRITICAL **: pango_layout_get_context: assertion `layout
!= NULL' failed

 

(App:5155): Pango-CRITICAL **: pango_context_get_language: assertion
`context != NULL' failed

 

(App:5155): Pango-CRITICAL **: pango_context_get_metrics: assertion
`PANGO_IS_CONTEXT (context)' failed

 

(App:5155): Pango-CRITICAL **:
pango_font_metrics_get_approximate_char_width: assertion `metrics != NULL'
failed

 

(App:5155): Pango-CRITICAL **:
pango_font_metrics_get_approximate_digit_width: assertion `metrics != NULL'
failed

 

(App:5155): Pango-CRITICAL **: pango_layout_set_width: assertion `layout !=
NULL' failed

 

(App:5155): Pango-CRITICAL **: pango_layout_get_extents: assertion `layout
!= NULL' failed

**

Gdk:ERROR:gdkregion-generic.c:1110:miUnionNonO: assertion failed: (y1 < y2)

 

Crash 3 -

(App:5883): Pango-CRITICAL **: pango_layout_set_width: assertion `layout !=
NULL' failed

 

(App:5883): Pango-CRITICAL **: pango_layout_get_extents: assertion `layout
!= NULL' failed

 

Gdk:ERROR:gdkregion-generic.c:1110:miUnionNonO: assertion failed: (y1 < y2)

 

--------------------------------------