Re: Strange GObject warning, crashes GUI

[Jaroslav Šmíd <jardasmid gmail com>]

If window managers hang because app is behaving "badly", it is serious 
bug of the window manager or even X itself - this just shall not happen 
and if it does it is yet another + for wayland.

On 01/15/2011 04:57 PM, John Coppens wrote:
> On Sat, 15 Jan 2011 12:38:03 +0200
> Mohammed Sameer<msameer foolab org>  wrote:
>
> > > GLib-GObject-WARNING **: gsignal.c:3081: signal name `depressed' is
> > > invalid for instance `0x8a0900'
> > >
> > > messages.
> >
> > I've seen this error only once when I was writing a C++ wrapper for a GObject and
> > the GObject instance was being unref'ed thus destroyed without the C++ wrapper
> > being informed. The C++ wrapper later on tried to call an "action signal" on
> > the invalid instance it had and Glib printed that error.
> >
> > So it was the C++ wrapper trying to use some garbage memory as the GObject.
>
> Hello Mohamed...
>
> Thanks for the reply. I'm programming in C, and the code for the
> ComboBox is very uncomplicated. Also, there is no way for anything to
> have been unref'd, as far as I can detect.
>
> Interesting would be to be able to identify what is at "instance
> `0x8a0900'"
>
> > I think this also explains the hang because of the invalid memory reference.
>
> The hang, according to a suggestion from Johannes on the Anjuta list:
>
> <quote>
> "That hang happens when you have a breakpoint in a signal handler
> that processes some kind of synchronous X event. Possible solution is to
> start anjuta from a different terminal like this:
>
> DISPLAY=:0 gdb anjuta
>
> and switch back to that terminal when X hangs and look at the debug
> output."
> </quote>
>
> This explains why most of the window manager hangs. I have yet to try
> this out.
>
> John
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