Re: debugging the gtk fe
On 7/28/05, fiandro@tiscali.it <fiandro@tiscali.it> wrote:
> As i told you before i'm not very good at debugging code, but from your message
> i've seen the problem is related to argc and argv pointers: they are hand-created
> at line 1370 of gtk.c this way
>
> /* FIXME: This can surely be done in a better way */
> (char**) name = malloc(2 * sizeof(char*));
> (char*) name[0] = malloc(8 * sizeof(char));
> name[0] = "debconf";
> name[1] = NULL;
>
> and used this way
>
> gtk_init (&args, &name);
>
> those lines used to be cause of some (not many) strange crashes even
> in an X environment.
> may be this related to the crashes?
>
Yep you forgot to allocate space for the terminal \0 and set it.
name[0] = malloc(10 * sizeof(char));
memset(name[0],10,sizeof(char);
Mike
>
> attilio
>
>
> >-- Messaggio Originale --
> >Date: Thu, 28 Jul 2005 16:27:00 +0200
> >From: zinosat@tiscali.it
> >Subject: Re: debugging the gtk fe
> >To: debian-boot@lists.debian.org
> >Cc: cjwatson@debian.org
> >
> >
> >Here's what Mike has found out:
> >
> >Okay it looks like a bug outside of gtk Davide and I got a standalone dev
> >env its attached. Bottom line is it looks like its outside the gtk code
> at
> >least now. I've got no idea what going on with the forked process etc etc.
> >I've never attached gdb through forks but it looks like one of the child
> >process crashed prob not the frontend.
> >
> >In short I don't see what I can do to help here except I do note that mutiple
> >frontends are supported do the otheres work. Failing that a few printfs
> to
> >track the initialization of the gtk fronted so you could attach and break
> >in the debugger before the crash is possible. I'm not in a position to build.
> > If the bug is only in the gtk frontend then printfs and commenting out
> code
> >can isolate the problem area so you know where to attach the debugger thats
> >what I have to do.
> >
> >Mike
> >
> >
> >Here is and important email
> >Hi Mike,
> >I should mention that last night I did not find what the cause of the crash
> >is, but I managed to grab an interesting gdb backtrace; atm I'm at work
> and
> >I don't have it. last night I posted it on the #debian-boot IRC channel,
> >and here is a message that could be interesting
> >
> >http://lists.debian.org/debian-boot/2005/07/msg01014.html
> >
> >let me know if you managed to start debconf
> >
> >
> >Here is the trace
> > ---------------------- DirectFB v0.9.23 ---------------------
> > (c) 2000-2002 convergence integrated media GmbH
> > (c) 2002-2004 convergence GmbH
> > -----------------------------------------------------------
> >
> >(*) DirectFB/Core: Single Application Core. (2005-07-21 22:02)
> >(*) Direct/Memcpy: Using MMXEXT optimized memcpy()
> >[New Thread 27106224 (LWP 14601)]
> >(*) Direct/Thread: Running 'SDL Input' (INPUT, 14601)...
> > (!!!) *** UNIMPLEMENTED [fusion_reactor_set_lock] *** [reactor.c:802]
> >(*) DirectFB/Input: SDL Input 0.1 (Denis Oliver Kropp)
> >(*) DirectFB/Genefx: MMX detected and enabled
> >(*) DirectFB/Graphics: MMX Software Rasterizer 0.6 (convergence integrated
> >media GmbH)
> >(*) DirectFB/Core/WM: Default 0.2 (Convergence GmbH)
> >[New Thread 66788272 (LWP 14602)]
> >(*) Direct/Thread: Running 'EventBufferFeed' (MESSAGING, 14602)...
> >
> >(debconf:14598): Gdk-DirectFB-WARNING **: gdk_display_request_selection_notification
> >Unimplemented function
> >
> >
> >(debconf:14598): Gdk-DirectFB-WARNING **: gdk_window_set_keep_above() not
> >implemented.
> >
> >
> >(debconf:14598): Gdk-DirectFB-WARNING **: gdk_window_set_keep_below() not
> >implemented.
> >
> >Detaching after fork from child process 14604.
> >
> >Program received signal SIGSEGV, Segmentation fault.
> >[Switching to Thread -1208772928 (LWP 14598)]
> >0x00000000 in ?? ()
> >(gdb) bt
> >#0 0x00000000 in ?? ()
> >#1 0x006d2379 in frontend_delete (obj=0x9fed348) at frontend.c:208 #2
> 0x08048a30
> >in cleanup () at debconf.c:41 #3 0x08048abf in sighandler (sig=17) at debconf.c:65
> >#4 <signal handler called> #5 0x00fd8402 in __kernel_vsyscall () #6 0x0080bd3b
> >in __read_nocancel () from /lib/libc.so.6 #7 0x006cf833 in confmodule_communicate
> >(mod=0xa0f2a20) at confmodule.c:77 #8 0x0804918a in main (argc=4, argv=0xbf85f134)
> >at debconf.c:153
> >(gdb) quit
> >
> >
> >
> >
> >On 7/27/05, Mike Emmel <mike.emmel@gmail.com> wrote:
> >> On 7/27/05, Attilio Fiandrotti <fiandro@tiscalinet.it> wrote:
> >> > since i'm very interested in the debugging of the frontend, could
> >> > you add me in the cc list?
> >>
> >> Sure no problem your on for me. At the moment nothing happening I'm
> missing
> >>
> >> linux-gate.so.1 => (0x00815000)
> >> libdebconf.so => not found
> >> libdl.so.2 => /lib/libdl.so.2 (0x00357000)
> >> libc.so.6 => /lib/libc.so.6 (0x00205000)
> >> /lib/ld-linux.so.2 (0x001e7000)
> >> libdebian-installer.so.4 => not found
> >>
> >> And want the source for the gtk part.
> >>
> >> Mike
> >>
> >>
> >> I'm currently missing these libs
> >>
> >>
> >> >
> >> > thanks
> >> >
> >> > attilio
> >> > Mike Emmel wrote:
> >> > > On 7/27/05, Davide Viti <zinosat@tiscali.it> wrote:
> >> > >
> >> > >>I recompiled DirectFB with --enable-debug=yes
> >> > >>here are some more details:
> >> > >>
> >> > >>http://www.webalice.it/zinosat/dfb_2.7_dbgen2.png
> >> > >>http://www.webalice.it/zinosat/dfb_2.7_dbgen.png
> >> > >>
> >> > >>hope this helps,
> >> > >>Davide
> >> > >>
> >> > >
> >> > > Yep you crashed :(
> >> > >
> >> > > I've got your app I'll try and run it.
> >> > >
> >> > > This is the last time I'll cc the list we can just continue with
> >> > > private emails. Mine is mike.emmel@gmail.com if its not showing
> >> > > for you.
> >> > >
> >> > > Mike
> >> > >
> >> > > _______________________________________________
> >> > > directfb-dev mailing list
> >> > > directfb-dev@directfb.org
> >> > > http://mail.directfb.org/cgi-bin/mailman/listinfo/directfb-dev
> >> > >
> >> >
> >> >
> >>
> >
> >
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>
> __________________________________________________________________
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