Re: gdb/1368: GDB 5.3.91, Redhat Linux 7.1, gcc 2.95.3, g++ 2.95.3, C++ and Qt

[Daniel Jacobowitz]

On Fri, Sep 05, 2003 at 10:02:53AM -0000, address@hidden wrote:
> 
> >Number:         1368
> >Category:       gdb
> >Synopsis:       GDB 5.3.91, Redhat Linux 7.1, gcc 2.95.3, g++ 2.95.3, C++ 
> >and Qt
> >Confidential:   no
> >Severity:       critical
> >Priority:       medium
> >Responsible:    unassigned
> >State:          open
> >Class:          sw-bug
> >Submitter-Id:   net
> >Arrival-Date:   Fri Sep 05 10:08:00 UTC 2003
> >Closed-Date:
> >Last-Modified:
> >Originator:     address@hidden
> >Release:        GNU gdb 5.3, GNU gdb 5.3.91
> >Organization:
> >Environment:
> Linux 7.1 (2.4.2-2smp), gcc 2.95.3, g++ 2.95.3, GDB was configured as 
> "i686-pc-linux-gnu"
> >Description:
> GDB seems to have some problems working with Qt applications on Linux 
> platform(It works perfectly on Sun Solaris) when compiled with shared 
> objects(It works perfectly when compiled with static libraries i.e., .a 
> files). It gets killed whenever I try to debug a Qt application irrespective 
> of the size of the application. The application doesn't have any problem(I'm 
> able to run that stand alone).  A detailed report of the bug is given in the 
> next paragraph.  I'm sorry that I cannot send the source files because of the 
> confidentiality I am supposed to maintain, but I've found that gdb crashes 
> with any Qt application on Linux when compiled with shared objects. So, you 
> can try with your own test applications.  I'm attaching a statically compiled 
> Scribble application(source code is available with Qt software, its a sample 
> program), but I don't think it will help since it doesn't seem to have any 
> problems.
> 
> Description of bug : GDB gets killed whenever I try to
> debug a Qt application that is compiled with shared objects. GDB does not 
> even seem to execute the first statement in main function. I checked it by 
> putting a break point at main, but it didn't help. GDB does some operation 
> after I give the command 'run' and after a while, it gives the command line 
> output 'Killed' and exits. I first tried with the GDB available with Redhat 
> Linux7.1 CD (version of GDB is 5.0 I suppose) and then downloaded and 
> compiled the
> version 5.3 from www.gnu.org and version 5.3.91 from 
> ftp://sources.redhat.com/pub/gdb/snapshots/branch/gdb-5.3.91.tar.bz2. None 
> helped.
> >How-To-Repeat:
> Compile any Qt application with -g option(for debugging) with shared 
> objects(of qt and other libraries) and try to debug it with gdb.  After some 
> time, gdb prints the message "Killed" and gets killed.

That doesn't sound like a GDB bug, it sounds like running out of
memory.  Are there kernel messages talking about killing it?  See
"dmesg".

-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer