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Re: Need help with a backtrace


Look at the backtrace (it goes backwards from the last function to be called to the caller of it, the caller of this caller and so on).

The call to gnome_app_create_menus() failed miserably.  If you look further on the stack you'll notice that the function  create_label() in  gnome-app-helper.c at line 402 called gtk_label_parse_uline() and one of the parameters seem to be an invalid pointer:
>     string=0xc615 <Address 0xc615 out of bounds>

It is either a bug in the gnome library or the GnomeUIInfo structure was not set properly.

It goes always like that.  See who called who and what the arguments were.

Using the up and down commands you can go up and down the stack and look at variables at that context.

Good luck.


Matt Schalit wrote:
> Hi all,
> Thanks for reading this.  I'm new to debugging and don't understand
> enough to read a backtrace.  I could use a little help with that.
> I'm running an i586-sco-sysv5uw7.1.1, and getting SIGSEGV's whenever
> I try to run gnomecc-1.2.2 (gnome control center) via
> enlightenment-0.16.5.   I never see a window.
> Regardless of whether I try to open any windows in Gnome, as soon
> as I start the desktop, I do see one warning about MIT-SHM not
> working correctly and to disable to Enlightenment Pager snapshots.
> I don't think that issue is relate to gnomecc.
> Can someone tell me what this means or point me to a nifty howto?
> Thanks a lot,
> Matthew
> ----------------------------------------------------------------------------
> $ gdb
> (gdb) file /usr/local/bin/gnomecc
> Reading symbols from /usr/local/bin/gnomecc...done.
> (gdb) run
> Starting program: /usr/local/bin/gnomecc
> warning: Lowest section in /usr/lib/ is .hash at 00000094
> [New LWP 1]
> [New LWP 2]
> Program received signal SIGSEGV, Segmentation fault.
> 0xbfa6f929 in _Xwcslen () from /usr/lib/
> [New Thread 1]
> (gdb) bt
> #0  0xbfa6f929 in _Xwcslen () from /usr/lib/
> #1  0x400 in ?? ()
> #2  0xbfa6fa28 in _XwcTextListToTextProperty () from /usr/lib/
> #3  0xbfb9048b in gtk_label_parse_uline (label=0x8139180,
>     string=0xc615 <Address 0xc615 out of bounds>) at gtklabel.c:1005
> #4  0xbfd95397 in create_label (label_text=0xbfe0a339 "", keyval=0x8047878)
>     at gnome-app-helper.c:402
> #5  0xbfd9630e in create_menu_item (menu_shell=0x8137ed0, uiinfo=0x809c770,
>     is_radio=0, radio_group=0x81379f8, uibdata=0x8047988,
>     accel_group=0x812ea40, uline_accels=1, pos=134510536)
>     at gnome-app-helper.c:933
> #6  0xbfd96f1a in gnome_app_fill_menu_custom (menu_shell=0x8137ed0,
>     uiinfo=0x809c770, uibdata=0x8047988, accel_group=0x812ea40,
>     uline_accels=1, pos=1) at gnome-app-helper.c:1326
> #7  0xbfd96fa9 in gnome_app_fill_menu_custom (menu_shell=0x812bd28,
>     uiinfo=0x809c84c, uibdata=0x8047988, accel_group=0x812ea40,
>     uline_accels=1, pos=1) at gnome-app-helper.c:1341
> #8  0xbfd976a1 in gnome_app_create_menus_custom (app=0x812db90,
>     uiinfo=0x809c820, uibdata=0x8047988) at gnome-app-helper.c:1516
> #9  0xbfd97163 in gnome_app_create_menus (app=0x812db90, uiinfo=0x809c820)
>     at gnome-app-helper.c:1395
> #10 0x804e967 in create_window () at main.c:200
> #11 0x804ecf8 in main (argc=1, argv=0x8047a0c) at main.c:282
> (gdb)
> -------------------------------------------------------------------------

Fernando Nasser
Red Hat - Toronto                       E-Mail:
2323 Yonge Street, Suite #300
Toronto, Ontario   M4P 2C9

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