Re: gdb/778: gdb 20021001 (gdb 5.2.1+) sparc-sun-solaris2.8 bus error when eval expr

[Daniel Jacobowitz <drow at mvista dot com>]

The following reply was made to PR gdb/778; it has been noted by GNATS.

From: Daniel Jacobowitz <drow@mvista.com>
To: rrh@cray.com
Cc: gdb-gnats@sources.redhat.com
Subject: Re: gdb/778: gdb 20021001 (gdb 5.2.1+) sparc-sun-solaris2.8 bus error when eval expr
Date: Tue, 1 Oct 2002 20:33:28 -0400

 On Tue, Oct 01, 2002 at 11:22:13PM -0000, rrh@cray.com wrote:
 > 
 > >Number:         778
 > >Category:       gdb
 > >Synopsis:       gdb 20021001 (gdb 5.2.1+) sparc-sun-solaris2.8 bus error when eval expr
 > >Confidential:   no
 > >Severity:       serious
 > >Priority:       medium
 > >Responsible:    unassigned
 > >State:          open
 > >Class:          sw-bug
 > >Submitter-Id:   net
 > >Arrival-Date:   Tue Oct 01 16:28:00 PDT 2002
 > >Closed-Date:
 > >Last-Modified:
 > >Originator:     rrh@cray.com
 > >Release:        GNU gdb 20021001 "sparc-sun-solaris2.8"
 > >Organization:
 > >Environment:
 > "sparc-sun-solaris2.8"
 > >Description:
 > Evaluating an expression in the gdb prompt that requires
 > invoking a virtual member function on the debugee causes the
 > debugger to take a bus error.  I couldn't create a simple
 > example.  The debugee was compiled using gcc 3.2.
 > 
 > #0  check_typedef (type=0x63617365) at gdbtypes.c:1340
 > 1340      while (TYPE_CODE (type) == TYPE_CODE_TYPEDEF)
 > 
 > (note that the pointer 0x63617365 is the string 'case'!)
 > 
 > 
 > Here's the backtrace of the debugger at the point of its bus error
 > #0  check_typedef (type=0x63617365) at gdbtypes.c:1340
 > #1  0x0005d67c in unpack_field_as_long (type=0x49f828, valaddr=0x536f48 "", 
 >     fieldno=-24) at values.c:1050
 
 0x63617365 is "case".  Something is creating a completely invalid type. 
 What's the previous one (at 0x49f828) look like?
 
 -- 
 Daniel Jacobowitz
 MontaVista Software                         Debian GNU/Linux Developer