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User-Agent: Mozilla/4.75 [en] (X11; U; Linux 2.2.5-15 i586)


Multiple 'stepi' followed by multiple 'next' leads to the complaint
"Can't fetch instructions for slot numbers greater than 2."
and then gdb can be lost (further 'n' causes gdb crash via SIGSEGV, etc.)


Reproducible: Always
Steps to Reproduce:
1. compile test program:  cc -g foo.c
2. invoke in background:  ./a.out &
3. attach with gdb, set register value to escape from inifinite loop,
   stepi (several times) out of infinite loop, 'next' several times.

c>cat foo.c
int go(int j)
{
	return j;
}

int a,b,c;

main()
{
	while (0==go(0)) {
		;  /* do nothing */
	}
	printf("Now is the time %d %d %d\n", a, b, c);
	return a+b;
}

c>

Actual Results:  c>cc -g foo.c
c>./a.out &
[1] 28656
c>/usr/bin/gdb ./a.out 28656
GNU gdb 5.0
Copyright 2000 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 "ia64-redhat-linux"...
/home/angus/jreiser/dv/insight/examples/c/28656: No such file or directory.
Attaching to program: /home/angus/jreiser/dv/insight/examples/c/./a.out,
Pid 28656
Reading symbols from /lib/libc.so.6.1...done.
Loaded symbols for /lib/libc.so.6.1
Reading symbols from /lib/ld-linux-ia64.so.2...done.
Loaded symbols for /lib/ld-linux-ia64.so.2
0x4000000000000681 in go (j=0) at foo.c:3
3		return j;
(gdb) x/i $pc
0x4000000000000681 <go+17>:	            mov r8=r14
(gdb) def g
Type commands for definition of "g".
End with a line saying just "end".
>stepi
>x/i $pc
>end
(gdb) set $r14 = 1
(gdb) g
4	}
0x4000000000000682 <go+18>:	            mov r12=r2
(gdb) 
0x4000000000000690	4	}
0x4000000000000690 <go+32>:	[MIB]       nop.m 0x0
(gdb) p/x $r8
$1 = 0x1
(gdb) g
0x4000000000000691	4	}
0x4000000000000691 <go+33>:	            nop.i 0x0
(gdb) 
0x4000000000000692	4	}
0x4000000000000692 <go+34>:	            br.ret.sptk.many b0;;
(gdb) 
0x40000000000006e0 in main () at foo.c:10
10		while (0==go(0)) {
0x40000000000006e0 <main+64>:	[MII]       mov r1=r32
(gdb) n
13		printf("Now is the time %d %d %d\n", a, b, c);
gdb) 
Now is the time 0 0 0
14		return a+b;
(gdb) 
15	}
(gdb) 
0x2000000000086d20 in __libc_start_main (main=0x4000000000000a48
<_fini+392>, 
    argc=1, ubp_av=0x80000ffffffff0a8, init=0x4000000000000a28 <_fini+360>, 
    fini=0x200000000003d500 <_dl_debug_impcalls>, 
    rtld_fini=0x2000000000250190 <translit_from_idx+304>, 
    stack_end=0x80000ffffffff0a0) at ../sysdeps/generic/libc-start.c:129
129	../sysdeps/generic/libc-start.c: No such file or directory.
	in ../sysdeps/generic/libc-start.c
(gdb) 
Can't fetch instructions for slot numbers greater than 2.
(gdb)
	

Expected Results:  No complaint "Can't fetch instructions for slot numbers
greater than 2."


c>rpm -q -f /usr/bin/gdb
gdb-5.0-13
c>ls -l /usr/bin/gdb
-rwxr-xr-x    1 root     root      4149304 Jan 22 05:47 /usr/bin/gdb
c>cat /etc/redhat-release
Red Hat Linux release 7.0.90 (Fisher)