From: Wolfgang Grandegger <wolfgang.grandegger@bluewin•ch>
To: Adam Wozniak <awozniak@comdev•cc>
Cc: linuxppc-embedded@lists•linuxppc.org
Subject: Re: problems with shared memory
Date: Thu, 07 Mar 2002 13:53:07 +0100 [thread overview]
Message-ID: <3C8762B3.4000201@bluewin.ch> (raw)
In-Reply-To: Pine.LNX.4.33.0203051631130.24566-100000@rangers.comdev.cc
Hi Adam,
David Ashley has reported lately a bug in arch/ppc/mm/ppc_mmu.c (see
http://lists.linuxppc.org/linuxppc-embedded/200202/msg00307.html),
which seems to be present in the linuxppc_2_4 tree but not in the
linuxppc_2_4_devel tree.
Hope it helps,
Wolfgang.
Adam Wozniak wrote:
>I've got Linux 2.4.16 running on a custom MPC8260 board.
>
>when I do the program below in a tight loop
>i.e.
>
>while true
>do
>./foo 8675 1024
>done
>
>Things pop after about 20 iterations. It'll choose a different spot
>in the kernel to pop depending on what options I've compiled into the
>kernel. I believe I've got some memory corruption going on. When I
>poke around with a hardware debugger I see values in kernel structures
>which clearly aren't right.
>
>Any known problems with shared memory in the 2.4.16 kernel on the MPC8260?
>
>This should be easy enough for someone to try to reproduce.
>
>=== begin foo.c
>#include <stdio.h>
>#include <sys/types.h>
>#include <sys/shm.h>
>
>int main (int argc, char **argv)
>{
> int j;
> char *q;
> int p;
>
> p = shmget(atoi(argv[1]), atoi(argv[2]), IPC_CREAT | 0666);
>
> q = shmat(p, NULL, 0);
>
> printf("at @ %p \n", q);
>
> {
> int i;
> for (i = 0; i < atoi(argv[2]); i++)
> {
> q[i]++;
> }
> }
>
> shmdt(q);
>}
>=== end foo.c
>
>--
>Adam Wozniak (KG6GZR) COM DEV Broadband - Digital and Software Systems
>awozniak@comdev•cc 805 Aerovista Place, San Luis Obispo, CA 93401
> http://www.comdev.cc
> Voice: (805) 544-1089 Fax: (805) 544-2055
>
>
>
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2002-03-07 12:53 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-06 0:37 problems with shared memory Adam Wozniak
2002-03-06 16:53 ` Adam Wozniak
2002-03-06 16:53 ` Adam Wozniak
2002-03-07 12:53 ` Wolfgang Grandegger [this message]
2002-03-07 14:47 ` somshekar kadam
2002-03-07 16:32 ` Adam Wozniak
2002-03-08 14:06 ` Wolfgang Grandegger
2002-03-14 14:44 ` Adam Wozniak
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