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Inexplicable segfault in libgtk-1.2

I am suffering from a consistently reproducible segmentation fault in
libgtk-1.2.so.0.9.1 from libgtk1.2 1.2.10-11.  This occurs in
gtkwidget.c:3156, which is the closing brace of a while loop.  However
it only occurs in this program and only on the 6th time through after
the breakpoint is set (which is just before selecting a value from the
drop-down list of a combo box).

The program is generated by smalleiffel and compiled by gcc 2.95 on i86
hardware (Athlon processor).  The error happens both with the binary
package of libgtk1.2 and also with the same package built locally.  I
attach gdb output.  Can anyone help me work out what is wrong, please?

(gdb) b gtkwidget.c:3155
Breakpoint 1 at 0x401075d4: file gtkwidget.c, line 3155.
(gdb) c

Breakpoint 1, gtk_widget_real_grab_focus (focus_widget=0x870a1a8)
    at gtkwidget.c:3155
3155              widget = widget->parent;
(gdb) c

...[repeated 4 times]...

Breakpoint 1, gtk_widget_real_grab_focus (focus_widget=0x8a3e1a8)
    at gtkwidget.c:3155
3155		  widget = widget->parent;
(gdb) disassemble
0x401075c8 <gtk_widget_real_grab_focus+404>:	add    $0xfffffff8,%esp
0x401075cb <gtk_widget_real_grab_focus+407>:	push   %esi
0x401075cc <gtk_widget_real_grab_focus+408>:	pushl  0x2c(%esi)
0x401075cf <gtk_widget_real_grab_focus+411>:	call   0x40031af4 <_init+3896>
0x401075d4 <gtk_widget_real_grab_focus+416>:	mov    0x2c(%esi),%esi
0x401075d7 <gtk_widget_real_grab_focus+419>:	add    $0x10,%esp
0x401075da <gtk_widget_real_grab_focus+422>:	cmpl   $0x0,0x2c(%esi)
0x401075de <gtk_widget_real_grab_focus+426>:	
    jne    0x401075c8 <gtk_widget_real_grab_focus+404>
0x401075e0 <gtk_widget_real_grab_focus+428>:	test   %esi,%esi
0x401075e2 <gtk_widget_real_grab_focus+430>:	
(gdb) nexti
3156		}
(gdb) nexti
0x401075da	3156		}
(gdb) nexti

Program received signal SIGSEGV, Segmentation fault.
0x401075da in gtk_widget_real_grab_focus (focus_widget=0x8a3e1a8)
    at gtkwidget.c:3156
3156		}

Oliver Elphick                                Oliver.Elphick@lfix.co.uk
Isle of Wight                              http://www.lfix.co.uk/oliver
GPG: 1024D/3E1D0C1C: CA12 09E0 E8D5 8870 5839  932A 614D 4C34 3E1D 0C1C

     "For I am persuaded, that neither death, nor life, nor 
      angels, nor principalities, nor powers, nor things 
      present, nor things to come, nor height, nor depth, 
      nor any other creature, shall be able to separate us 
      from the love of God, which is in Christ Jesus our 
      Lord."     Romans 8:38,39 

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