gdb 5.1.92-1 crash on C++ program

gdb 5.1.92-1 crash on C++ program

[Craig Rodrigues]

Hi,

I downloaded the Source rpm for gdb 5.1.92-1 from rawhide.redhat.com.

I compiled a C++ program with:

2.96 20000731 (Red Hat Linux 7.1 2.96-85)

When I tried to debug my program, gdb coredumped:
==================================================================================
% gdb server

GNU gdb Red Hat Linux (5.1.92-1)
Copyright 2002 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 "i386-redhat-linux"...
(gdb) b 93
Breakpoint 1 at 0x80512b7: file server.cpp, line 93.
(gdb) run -o server.ior
Starting program: /home/crodrigu/Big_Twoways/server -o server.ior
[New Thread 1024 (LWP 2348)]
[Switching to Thread 1024 (LWP 2348)]

Breakpoint 1, main (argc=3, argv=0xbffff5b4) at server.cpp:96
96              coordinator_impl->_this (ACE_ENV_SINGLE_ARG_PARAMETER);
(gdb) p coordinator_impl
$1 = (class Coordinator *) 0x80bf0a8
(gdb) p *coordinator_impl
Segmentation fault (core dumped)
==================================================================================

The static trace for gdb looked like:

#0  0x080a77bd in fill_in_vptr_fieldno ()
#1  0x080a77f2 in fill_in_vptr_fieldno ()
#2  0x080a77f2 in fill_in_vptr_fieldno ()
#3  0x080a77f2 in fill_in_vptr_fieldno ()
#4  0x080a77f2 in fill_in_vptr_fieldno ()
#5  0x080a77f2 in fill_in_vptr_fieldno ()
#6  0x080a77f2 in fill_in_vptr_fieldno ()
#7  0x080a77f2 in fill_in_vptr_fieldno ()
#8  0x080a77f2 in fill_in_vptr_fieldno ()
#9  0x080a77f2 in fill_in_vptr_fieldno ()
#10 0x080a77f2 in fill_in_vptr_fieldno ()
#11 0x080a77f2 in fill_in_vptr_fieldno ()
#12 0x080a77f2 in fill_in_vptr_fieldno ()
#13 0x080a77f2 in fill_in_vptr_fieldno ()
#14 0x080a77f2 in fill_in_vptr_fieldno ()
#15 0x080a77f2 in fill_in_vptr_fieldno ()
#16 0x080a77f2 in fill_in_vptr_fieldno ()
#17 0x080a77f2 in fill_in_vptr_fieldno ()
#18 0x080a77f2 in fill_in_vptr_fieldno ()
#19 0x080a77f2 in fill_in_vptr_fieldno ()
#20 0x080a77f2 in fill_in_vptr_fieldno ()

[ etc. ]



Just for fun, I tried compiling the same program with gcc 3.1 (prerelease)
and I got the same coredump in gdb.

Does anyone have any ideas as to what the problem could be?

Thanks.
-- 
Craig Rodrigues        
http://www.gis.net/~craigr    
rodrigc@attbi.com

Re: gdb 5.1.92-1 crash on C++ program

[Daniel Jacobowitz]

On Thu, May 02, 2002 at 05:00:18PM -0400, Craig Rodrigues wrote:
> The static trace for gdb looked like:
> 
> #0  0x080a77bd in fill_in_vptr_fieldno ()
> #1  0x080a77f2 in fill_in_vptr_fieldno ()
> #2  0x080a77f2 in fill_in_vptr_fieldno ()

This strongly suggests that a type appears in its own TYPE_BASECLASS
list.  Could you provide a small testcase - probably only the necessary
types to define the object that caused the segfault will suffice.  This
might even be related to the stabs bug Jim just fixed.

-- 
Daniel Jacobowitz                           Carnegie Mellon University
MontaVista Software                         Debian GNU/Linux Developer