backtrace/1760: set backtrace limit broken

[dsl at sources dot redhat dot com]

>Number:         1760
>Category:       backtrace
>Synopsis:       set backtrace limit broken
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Aug 25 18:38:00 UTC 2004
>Closed-Date:
>Last-Modified:
>Originator:     dsl@sources.redhat.com
>Release:        unknown-1.0
>Organization:
>Environment:
x86 fedora 2, and others 
>Description:

The backtrace limit setting is busted, the latest CVS + GDB 6.2, and
6.0..   Symptoms are lots of warnings about the backtrace limit being
exceeded when it clearly isn't, and also a frame of -1!    When the
limit is removed the output is then two frames instead of one..

#include <stdio.h>

int main() {

  int x, y;

  x = 1;
  y = 2;

  printf("%d %d\n", x, y);
}


GNU gdb 20040817
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you
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There is absolutely no warranty for GDB.  Type "show warranty" for
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This GDB was configured as "i686-pc-linux-gnu"...Using host libthread_db
library "/lib/tls/libthread_db.so.1".

(gdb) b main
Breakpoint 1 at 0x8048380: file seqtest.c, line 7.
(gdb) r
Starting program: /home/david/Work/v1-7-3/code/ddt/examples/seq

Breakpoint 1, main () at seqtest.c:7
7         x = 1;
(gdb) bt
#0  main () at seqtest.c:7
(gdb) set backtrace limit 100
(gdb) r
The program being debugged has been started already.
Start it from the beginning? (y or n) y
Starting program: /home/david/Work/v1-7-3/code/ddt/examples/seq
Backtrace limit of 100 exceeded
Backtrace limit of 100 exceeded

Breakpoint 1, main () at seqtest.c:7
7         x = 1;
(gdb) bt
#-1 main () at seqtest.c:7
Backtrace limit of 100 exceeded
(gdb) set backtrace limit 0
(gdb) bt
#-1 main () at seqtest.c:7
#0  main () at seqtest.c:7
(gdb)



>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
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