Date: Fri, 12 Sep 1997 03:17:20 -0700 (PDT) From: yasu@mrit.mei.co.jp To: freebsd-gnats-submit@FreeBSD.ORG Subject: gnu/4517: Cannot debug with gdb with message 'Error accessing memory address' Message-ID: <199709121017.DAA22884@hub.freebsd.org> Resent-Message-ID: <199709121020.DAA23044@hub.freebsd.org>
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>Number: 4517
>Category: gnu
>Synopsis: Cannot debug with gdb with message 'Error accessing memory address'
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Fri Sep 12 03:20:01 PDT 1997
>Last-Modified:
>Originator: Yasuhiko Watanabe
>Organization:
Matsushita Research Institute Tokyo, Inc.
>Release: FreeBSD 3.0-CURRENT
>Environment:
FreeBSD waltz 3.0-CURRENT FreeBSD 3.0-CURRENT #0: Fri Sep 5 16:57:09 JST 1997 yasu@waltz:/usr/src/sys/compile/SMALL i386
>Description:
Cannot set value to automatic variable when debuggin with gdb.
Setting to an automatic variable cause
"Error accessing memory address 0x???????: Bad address."
message.
>How-To-Repeat:
Debugging code below with gdb, I got error message
and could not set value to the variable 'x'.
---------- test.c ----------
main(){
int x;
x = 1;
}
---------- test.c end----------
Above code is complied with:
% cc -g -o test test.c
Debugged with gdb:
% gdb ./test
It said:
GDB is free software and you are welcome to 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.
GDB 4.16 (i386-unknown-freebsd),
Copyright 1996 Free Software Foundation, Inc...
(gdb) b main
Breakpoint 1 at 0x163b: file test.c, line 3.
(gdb) run
Starting program: /a/steffi/export/yasu/./test
Breakpoint 1, main () at test.c:3
3 x = 1;
(gdb) n
4 }
(gdb) set x = 100;
Error accessing memory address 0xefbfd48c: Bad address.
(gdb) quit
The program is running. Quit anyway (and kill it)? (y or n) y
---------------------------------------------------------------
If I define x as static, I can set value to x.
>Fix:
>Audit-Trail:
>Unformatted:
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