[Geany-devel] Crash when pasting a Zero-width space

Tue Jun 26 11:34:15 UTC 2012

On 26 June 2012 21:04, Harold Aling <geany at sait.nl> wrote:
> On Tue, Jun 26, 2012 at 12:16 PM, Lex Trotman <elextr at gmail.com> wrote:
>> On 26 June 2012 20:09, Harold Aling <geany at sait.nl> wrote:
>>> On Tue, Jun 26, 2012 at 12:05 PM, Lex Trotman <elextr at gmail.com> wrote:
>>>> On 26 June 2012 20:01, Thomas Martitz
>>>> <thomas.martitz at student.htw-berlin.de> wrote:
>>>>> Am 26.06.2012 11:53, schrieb Harold Aling:
>>>>>
>>>>>> Updated to Geany 1.23 (git >= 40da14b)
>>>>>>
>>>>>> 1. Create a new document (ctrl-n)
>>>>>> 2. Copy/paste "mA" (already has a zero-width space in the middle)
>>>>>> 3. Press 'home'
>>>>>> 4. Press 'delete'
>>>>>> 5. Crash -> 100% CPU
>>>>>
>>>>>
>>>>> Works for me. No crash and no 100% CPU usage.
>>>>>
>>>>>
>>>>>> Geany also counts that character as 3 positions instead of 1.
>>>>>
>>>>>
>>>>> Depending on your POV, this is the correct behavior (the pos field actually
>>>>> shows the byte offset since the start of the file, hence it's 0-based also).
>>>>
>>>> Yes, the column count only counts it as one though pos counts as 3.
>>>> Pos is bytes, thats a scintilla definition.
>>>>
>>>> I would guess its something about the Ubuntu specials, just for comparison
>>>>
>>>> 08:47:15: Geany INFO            : Geany 1.23 (git >= 8187268), en_AU.UTF-8
>>>> 08:47:15: Geany INFO            : GTK 2.24.10, GLib 2.30.2
>>>>
>>>>  (From the help->debug messages GUI :)
>>>>
>>>> Whats yours say?
>>>
>>> 11:59:08: Geany INFO            : Geany 1.23 (git >= 40da14b), en_US.UTF-8
>>> 11:59:08: Geany INFO            : GTK 2.24.10, GLib 2.32.3
>>
>> Oh, I'm missing a commit, never mind not relevant.
>>
>> Yeah, that looks ok, your file is UTF-8 which is fine, the difference
>> in Glib shouldn't affect it, all I can think of is that its Ubuntu
>> specific, they are known to add patches to GTK, so maybe its one of
>> those?
>>
>> Can you run Geany under gdb and get a backtrace?
>
> 1. $ gdb geany
> (gdb) run
> Starting program: /usr/local/bin/geany
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
>
> (geany:22407): Gtk-WARNING **: Unable to locate theme engine in
> module_path: "pixmap",
> [New Thread 0x7fffe5325700 (LWP 22412)]
>
> 2. Crash Geany using the steps above -> (geany:22407):
> GProject-CRITICAL **: on_doc_activate: assertion `doc != NULL &&
> doc->file_name != NULL' failed
>
> 3. ctrl-c (to get the gdb prompt)
>
> 4. (gdb) bt
> #0  0x0000000000550b39 in SelectionPosition::SetPosition(int) ()
> #1  0x000000000052bdfb in
> Editor::MovePositionOutsideChar(SelectionPosition, int, bool) const ()
> #2  0x000000000052bd75 in Editor::MovePositionOutsideChar(int, int,
> bool) const ()

Hmmm, trying to draw a block caret over a zero width character.  Now I
can reproduce it!!!

Will submit it scintilla

Cheers
Lex

> #3  0x0000000000536f77 in Editor::DrawBlockCaret(Surface*, ViewStyle&,
> LineLayout*, int, int, int, int, PRectangle, ColourAllocated) ()
> #4  0x0000000000537edc in Editor::DrawCarets(Surface*, ViewStyle&,
> int, int, PRectangle, LineLayout*, int) ()
> #5  0x0000000000538c2b in Editor::Paint(Surface*, PRectangle) ()
> #6  0x0000000000500e6f in ScintillaGTK::ExposeTextThis(_GtkWidget*,
> _GdkEventExpose*) ()
> #7  0x0000000000500f55 in ScintillaGTK::ExposeText(_GtkWidget*,
> _GdkEventExpose*, ScintillaGTK*) ()
> #8  0x00007ffff78d6dd8 in ?? () from
> /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
> #9  0x00007ffff662cca2 in g_closure_invoke () from
> /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
> #10 0x00007ffff663dd71 in ?? () from
> /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
> #11 0x00007ffff6645d7e in g_signal_emit_valist () from
> /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
> #12 0x00007ffff6646242 in g_signal_emit () from
> /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
> #13 0x00007ffff79f1191 in ?? () from
> /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
> #14 0x00007ffff78d5587 in gtk_main_do_event () from
> /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
> #15 0x00007ffff7531604 in ?? () from
> /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
> #16 0x00007ffff75315b3 in ?? () from
> /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
> #17 0x00007ffff752c5a3 in ?? () from
> /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
> #18 0x00007ffff752e741 in gdk_window_process_all_updates () from
> /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
> #19 0x00007ffff752e7a9 in ?? () from
> /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
> #20 0x00007ffff750bd56 in ?? () from
> /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
> #21 0x00007ffff636fd53 in g_main_context_dispatch () from
> /lib/x86_64-linux-gnu/libglib-2.0.so.0
> #22 0x00007ffff63700a0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
> #23 0x00007ffff637049a in g_main_loop_run () from
> /lib/x86_64-linux-gnu/libglib-2.0.so.0
> #24 0x00007ffff78d42f7 in gtk_main () from
> /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
> #25 0x00000000004df1fc in main (argc=1, argv=0x7fffffffe298) at
> ../src/main.c:1155
> (gdb)
>
>
> -H-
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