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Re: Trouble running the cairo backend

From: Fred Kiefer
Subject: Re: Trouble running the cairo backend
Date: Sat, 02 Feb 2008 12:53:04 +0100
User-agent: Thunderbird (X11/20070801)

You case seems to be different. In the old bug report the problem was on
FreeBSD and you seem to be on Ubuntu.

You also get an X error before cairo complains. I would expect that the
X error is the source of the problem. We need to find out what is going
wrong there and then we will be able to understand what cairo is trying
to tell us. You should be able to see this by setting a break point into
XGErrorHandler and generating a back trace.

My problem now is that I am not that sure, which code made it into
0.12.1. I am of course working with current SVN and this is more or less
resembled in 0.13.1. I expect that the cairo code in 0.12.1 is rather
close to release 0.12. In which case most of the more fancy X setups
wont be supported. Could you try to report the context found in
bestContext() (in file context.c)?

It would also be great to switch to the current SVN source to see if the
problem still persists or has already been resolved.


TMC wrote:
> Fred Kiefer wrote:
>> Could you please run it with --debug to start up gdb? This could show us
>> the location of the problem. The most likely reason is that somewhere we
>> get an error status from cairo and fail to check for it and later we get
>> this useless error message.
>> Fred
> I'm experiencing the same problem. `debugapp GWorkspace` output:
> GNU gdb 6.6-debian
> Copyright (C) 2006 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and you are
> welcome to change it and/or distribute copies of it under certain
> conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB.  Type "show warranty" for details.
> This GDB was configured as "i486-linux-gnu"...
> Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
> (gdb) run
> Starting program:
> /home/tycho/GNUstep/System/Applications/GWorkspace.app/GWorkspace 
> [Thread debugging using libthread_db enabled]
> [New Thread -1221359952 (LWP 7647)]
> 2008-02-01 17:13:24.191 GWorkspace[7647] X-Windows error - BadMatch (invalid
> parameter attributes)
>           on display: :0.0
>                 type: 0
>        serial number: 110
>         request code: 2
> 2008-02-01 17:13:24.321 GWorkspace[7647] Cairo status out of memory in copy
> 2008-02-01 17:13:24.705 GWorkspace[7647] Cairo status out of memory in copy
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to Thread -1221359952 (LWP 7647)]
> 0xb7086399 in ?? () from /usr/lib/libcairo.so.2
> (gdb) quit
> The program is running.  Exit anyway? (y or n) y
> My system:
> Xubuntu 7.10 Gutsy Gibbon
> libcairo2 version 1.4.10-ubuntu4.4
> libcairo2-dev version 1.4.10-ubuntu4.4
> gnustep
> -back-0.12.1
> -base-1.14.2
> -gui-0.12.1
> -make-2.0.4
> --Tycho Martin Clendenny

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