Following backtrace instructions as provided on wiki, I got it running
in debug mode. Unfortunately I cannot decode this information. Can you
please take a look and guide me about the direction I should investigate
my source code?

(gdb) break fpc_raiseexception
Breakpoint 1 at 0x8062de6
(gdb) run
Starting program: /home/panos/projects/dicrionary.prj/0. Active/mgde
[Thread debugging using libthread_db enabled]
[New Thread -1217198400 (LWP 12502)]
TGtk2WSCustomListBox.SetBorder TODO

(mgde:12502): Gtk-CRITICAL **: gtk_text_buffer_emit_insert: assertion
`g_utf8_validate (text, len, NULL)' failed

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1217198400 (LWP 12502)]
0x080680b3 in SYSTEM_TRY_CONCAT_FREE_CHUNK$PMEMCHUNK_VAR
$$PMEMCHUNK_VAR()

and battrace report

(gdb) bt
#0  0x080680b3 in SYSTEM_TRY_CONCAT_FREE_CHUNK$PMEMCHUNK_VAR
$$PMEMCHUNK_VAR ()
#1  0xb6df33a0 in ?? ()
#2  0x00000100 in ?? ()
#3  0x08068652 in SYSTEM_SYSFREEMEM_VAR$PMEMCHUNK_VAR$$LONGINT ()
#4  0xb6df33a0 in ?? ()
#5  0xbfffe0ac in ?? ()
#6  0x080686ab in SYSTEM_SYSFREEMEM$POINTER$$LONGINT ()
#7  0xb73b3e98 in ?? ()
#8  0xbfffe0ac in ?? ()
#9  0x08068932 in SYSTEM_SYSREALLOCMEM$POINTER$LONGINT$$POINTER ()
#10 0x000001c0 in ?? ()
#11 0x000001aa in ?? ()
#12 0x000001b7 in ?? ()
#13 0x0000000d in ?? ()
#14 0x08067bdd in SYSTEM_REALLOCMEM$POINTER$LONGINT$$POINTER ()
#15 0x0805de81 in fpc_ansistr_setlength ()
#16 0xbfffe0ac in ?? ()
#17 0xbfffe0bc in ?? ()
#18 0x0000000d in ?? ()
#19 0x000001aa in ?? ()
#20 0xb6f0e028 in ?? ()
#21 0xb710e030 in ?? ()
#22 0x0805e089 in fpc_ansistr_append_ansistring ()
#23 0xbfffe0ac in ?? ()
#24 0xb7013e10 in ?? ()
#25 0xbfffdfa0 in ?? ()
#26 0xb6f0e028 in ?? ()
#27 0x08093c45 in FORMATCURRENTTOPIC (UNFORMATTEDSTRING=
        {length = 255 '', st = {47 '/', 115 's', 91 '[', 100 'd', 105
'i', 100 'd', 122 'z', 104 'h', 69 'E', 115 's', 116 't', 115 's', 104
'h', 110 'n', 93 ']', 47 '/', 115 's', 32 ' ', 47 '/', 107 'k', 206 '�,
191 '', 207 '�, 133 '\205', 207
 '�, 131 '\203', 47 '/', 107 'k', 46 '.', 32 ' ', 47 '/', 99 'c', 207
'�, 134 '\206', 207 '�, 133 '\205', 207 '�, 131 '\203', 206 '�, 185 '',
206 '�, 191 '', 206 '�, 187 '', 47 '/', 99 'c', 46 '.', 32 ' ', 40 '(',
207 '�, 137 '\211', 207 '�, 130 '\202', 32 ' ', 206 '�, 187 '', 206 '�,
181 '', 206 '�, 185 '', 207 '�, 132 '\204', 206 '�, 191 '', 207 '
�, 133 '\205', 207 '�, 129 '\201', 206 '�, 179 '', 206 '�, 175 '', 206
'�, 177 '', 32 ' ', 206 '�, 186 '', 206 '�, 177 '', 206 '�, 185 '', 32 '
', 206 '�, 185 '', 206 '�, 186 '', 206 '�, 177 '', 206 '�, 189 '', 207
'�, 140 '\214', 207 '�, 132 '\204', 206 '�, 183 '', 207 '�, 132 '\204',
206 '�, 177 '', 58 ':', 41 ')', 32 ' ', 47 '/', 120 'x',
 207 '�, 128 '\200', 206 '�, 173 '', 207 '�, 136 '\210', 206 '�, 183 '',
47 '/', 120 'x', 44 ',', 32 ' ', 47 '/', 120 'x', 207 '�, 135 '\207',
207 '�, 142 '\216', 206 '�, 189 '', 206 '�, 181 '', 207 '�, 133 '\205',
207 '�, 131 '\203', 206 '�, 183 '', 47 '/', 120 'x', 44 ',', 32 ' ', 47
'/', 120 'x', 206 '�, 177 '', 207 '�, 134 '\206', 206 '�, 191 ''
, 206 '�, 188 '', 206 '�, 191 '', 206 '�, 175 '', 207 '�, 137 '\211',
207 '�, 131 '\203', 206 '�, 183 '', 47 '/', 120 'x', 58 ':', 32 ' ', 47
'/', 101 'e', 115 's', 117 'u', 98 'b', 115 's', 116 't', 97 'a', 110
'n', 99 'c', 101 'e', 32 ' ', 97 'a', 105 'i', 100 'd', 105 'i', 110
'n', 103 'g', 32 ' ', 100 'd', 105 'i', 103 'g', 101 'e', 115 's', 116
't', 105 '
i', 111 'o', 110 'n', 47 '/', 101 'e', 32 ' ', 47 '/', 103 'g', 206 '�,
191 '', 207 '�, 133 '\205', 207 '�, 131 '\203'...}}, NCANVASWIDTH=19,
DICTIONARYDATASET=0xb6f0e028, THEFORM=0xb720e028) at
dictionariesdrawtopicfunctionsunit.pas:1064
#28 0x08080211 in TMAINFORM__WORDSFOUNDLISTBOXSELECTIONCHANGE
(SENDER=0xb7225068, USER=true, this=0xb720e028)
    at mainunit.pas:1016
#29 0x0812de8a in TCUSTOMLISTBOX__DOSELECTIONCHANGE (USER=true,
this=0xb7225068) at customlistbox.inc:399
#30 0x0812d9e6 in TCUSTOMLISTBOX__LMSELCHANGE (THEMESSAGE={formal}
0xbfffe3ec, this=0xb7225068) at customlistbox.inc:239
#31 0x080623dd in SYSTEM_TOBJECT_$__DISPATCH$formal ()
#32 0x0812d98c in TCUSTOMLISTBOX__LMMEASUREITEM (THEMESSAGE={MSG = 564,
IDCTL = 0, MEASUREITEMSTRUCT = 0x0, RESULT = 0},
    this=0xb7225068) at customlistbox.inc:227
#33 0x08100bd5 in TWINCONTROL__WNDPROC (MESSAGE=
      {MSG = 564, WPARAM = 0, LPARAM = 0, RESULT = 0, WPARAMLO = 0,
WPARAMHI = 0, LPARAMLO = 0, LPARAMHI = 0, RESULTLO = 0, RESULTHI = 0},
this=0xb7225068) at wincontrol.inc:3347
#34 0x081cc34d in DELIVERMESSAGE (TARGET=0xb7225068, AMESSAGE={formal}
0xbfffe3ec) at gtkproc.inc:3462
#35 0x08207a04 in GTK2WS_LISTBOXCHANGE (SELECTION=0x86cc948,
WIDGETINFO=0xb76dda78) at gtk2wsstdctrls.pp:250
#36 0xb7b61f0b in g_cclosure_marshal_VOID__VOID ()
from /usr/lib/libgobject-2.0.so.0
#37 0xb7b55839 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#38 0xb7b650ea in g_signal_stop_emission ()
from /usr/lib/libgobject-2.0.so.0
#39 0xb7b66970 in g_signal_emit_valist ()
from /usr/lib/libgobject-2.0.so.0
#40 0xb7b66cd9 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#41 0xb7d77890 in _gtk_tree_selection_internal_select_node ()
from /usr/lib/libgtk-x11-2.0.so.0
#42 0xb7d8acb0 in gtk_tree_view_scroll_to_cell ()
from /usr/lib/libgtk-x11-2.0.so.0
#43 0xb7d92dec in gtk_tree_view_set_model ()
from /usr/lib/libgtk-x11-2.0.so.0
#44 0xb7cb4b3a in _gtk_marshal_BOOLEAN__ENUM_INT ()
from /usr/lib/libgtk-x11-2.0.so.0
#45 0xb7b55179 in g_cclosure_new_swap ()
from /usr/lib/libgobject-2.0.so.0
#46 0xb7b55839 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#47 0xb7b657f5 in g_signal_stop_emission ()
from /usr/lib/libgobject-2.0.so.0
#48 0xb7b660ab in g_signal_emitv () from /usr/lib/libgobject-2.0.so.0
#49 0xb7be21dd in gtk_bin_get_child () from /usr/lib/libgtk-x11-2.0.so.0
#50 0xb7be32cc in gtk_binding_set_by_class ()
from /usr/lib/libgtk-x11-2.0.so.0
#51 0xb7be3568 in gtk_binding_set_by_class ()
from /usr/lib/libgtk-x11-2.0.so.0
#52 0xb7be376d in gtk_bindings_activate_event ()
from /usr/lib/libgtk-x11-2.0.so.0
#53 0xb7da5ec8 in gtk_widget_activate ()
from /usr/lib/libgtk-x11-2.0.so.0
#54 0xb7d90ba9 in gtk_tree_view_set_search_equal_func ()
from /usr/lib/libgtk-x11-2.0.so.0
#55 0xb7cb47f0 in _gtk_marshal_BOOLEAN__BOXED ()
from /usr/lib/libgtk-x11-2.0.so.0
#56 0xb7b55179 in g_cclosure_new_swap ()
from /usr/lib/libgobject-2.0.so.0
#57 0xb7b55839 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#58 0xb7b657f5 in g_signal_stop_emission ()
from /usr/lib/libgobject-2.0.so.0
#59 0xb7b666de in g_signal_emit_valist ()
from /usr/lib/libgobject-2.0.so.0
#60 0xb7b66cd9 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#61 0xb7da60c4 in gtk_widget_activate ()
from /usr/lib/libgtk-x11-2.0.so.0
#62 0xb7db6a93 in gtk_window_propagate_key_event ()
from /usr/lib/libgtk-x11-2.0.so.0
#63 0xb7dbb23c in gtk_window_activate_key ()
from /usr/lib/libgtk-x11-2.0.so.0
#64 0xb7cb47f0 in _gtk_marshal_BOOLEAN__BOXED ()
from /usr/lib/libgtk-x11-2.0.so.0
#65 0xb7b55179 in g_cclosure_new_swap ()
from /usr/lib/libgobject-2.0.so.0
#66 0xb7b55839 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#67 0xb7b657f5 in g_signal_stop_emission ()
from /usr/lib/libgobject-2.0.so.0
#68 0xb7b666de in g_signal_emit_valist ()
from /usr/lib/libgobject-2.0.so.0
#69 0xb7b66cd9 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#70 0xb7da60c4 in gtk_widget_activate ()
from /usr/lib/libgtk-x11-2.0.so.0
#71 0xb7cb2d45 in gtk_propagate_event ()
from /usr/lib/libgtk-x11-2.0.so.0
#72 0xb7cb3093 in gtk_main_do_event () from /usr/lib/libgtk-x11-2.0.so.0
#73 0xb7f992da in _gdk_events_queue () from /usr/lib/libgdk-x11-2.0.so.0
#74 0xb7aebb8c in g_main_context_dispatch ()
from /usr/lib/libglib-2.0.so.0
#75 0xb7aeef6b in g_main_context_check () from /usr/lib/libglib-2.0.so.0
#76 0xb7aef447 in g_main_context_iteration ()
from /usr/lib/libglib-2.0.so.0
#77 0xb7cb19c3 in gtk_main_iteration_do ()
from /usr/lib/libgtk-x11-2.0.so.0
#78 0x081663b6 in TGTKWIDGETSET__APPWAITMESSAGE (this=0xb7680028) at
gtkobject.inc:1796
#79 0x080779d3 in TAPPLICATION__IDLE (WAIT=true, this=0xb76a8028) at
application.inc:280
#80 0x08078e01 in TAPPLICATION__HANDLEMESSAGE (this=0xb76a8028) at
application.inc:900
#81 0x08079174 in RUNMESSAGE (parentfp=0xbffff9d0) at
application.inc:1017
#82 0x080790bf in TAPPLICATION__RUNLOOP (this=0xb76a8028) at
application.inc:1027
#83 0x08099fe7 in TWIDGETSET__APPRUN (ALOOP=0x8079080
<TAPPLICATION__RUNLOOP>, this=0xb7680028) at interfacebase.inc:42
#84 0x0807906c in TAPPLICATION__RUN (this=0xb76a8028) at
application.inc:1006
#85 0x080587c7 in main () at mgde.lpr:26

Regards, Panagiotis

Στις 28-03-2006, ημέρα Τρι, και ώρα 19:16 +0200, ο/η Darius Blaszijk
έγραψε:
> Panagiotis,
> 
> If you want more information on where an error in your app starts, look at 
> the wiki there's a page on how to make a backtrace. If you still don't see 
> where the problem is, then post the bt here.
> 
> Darius
> 
> 
> ----- Original Message ----- 
> From: "Panagiotis Sidiropoulos" <[EMAIL PROTECTED]>
> To: <[email protected]>
> Sent: Tuesday, March 28, 2006 5:59 PM
> Subject: [lazarus] SIGSEGV error
> 
> 
> > While running my application and try several things, I get errors:
> >
> > - Project <project title> class 'External: SIGSEGV'
> > - Access violation
> >
> > just the one after the other, if running through IDE. When running
> > executable directly I get 'Access violation' only.
> >
> > There is not specific point this error is produced so I'm completely
> > confused. Maybe it is related to compiler settings, maybe this has to do
> > to my limited undestanding of Linux system, I don't know. I wish I could
> > provide more information but I do not have anything more than above
> > mentioned, at least I don't know what information would be useful.
> >
> > Searching list archive, Lazarus/FreePascal forums and web, I found
> > several related posts, most regarding Windows or prior revisions of
> > Lazarus on Linux. I was getting similar error once again and was related
> > to sqldb. That problem solved by upgrading fpc and lazarus as suggested
> > by list members.
> >
> > If anyone is familiar to this, behaviour even not getting necessary
> > information, please advise or suggest what to check.
> >
> > OS Linux
> > Lazarus v0.9.13 beta, r9022
> > FPC r3068
> >
> > Regards, Panagiotis
> >
> > _________________________________________________________________
> >     To unsubscribe: mail [EMAIL PROTECTED] with
> >                "unsubscribe" as the Subject
> >   archives at http://www.lazarus.freepascal.org/mailarchives 
> 
> _________________________________________________________________
>      To unsubscribe: mail [EMAIL PROTECTED] with
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> 

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