Help about Freescale p2020ds problem under cpu load test

Hi Benjamin Herrenschmidt,

I use Freescale p2020ds board and kernel linux 2.6.33. Under cpu load test which test case is in attachment (#./cpu_load_multi.sh 500),
the follow issues happen after a long time:
=======================
find: md5sum terminated by signal 6

find: md5sum terminated by signal 11
=======================

If use kernel linux 2.6.27(porting p2020ds bsp to it), it's easy to reproduce the issue:
=======================
find: ../nptl/sysdeps/unix/sysv/linux/powerpc/../i386/../fork.c:138:
__libc_fork: Assertion `((void)(self), (((struct pthread *) (__thread_register - 0x7000 - (sizeof (struct pthread) + ((sizeof
(tcbhead_t) + __alignof__ (struct pthread) - 1)& ~(__alignof__ (struct
pthread) - 1))))))->tid) != ppid' failed.

find: md5sum terminated by signal 6

find: md5sum terminated by signal 11

./cpu_load.sh: line 6: 7944 Segmentation fault find /usr -type f
-exec md5sum {} \;> /dev/null
=======================

If turn off CONFIG_SMP, the issue disappear.

If use Freescale 8572ds board, the issue disappear, too.
I know the two board is same about cpu(e500v2), but their version have a little difference:
===================
fsl_8572ds:
cpu : e500v2
revision : 3.0 (pvr 8021 0030)

fsl_p2020ds:
cpu : e500v2
revision : 4.0 (pvr 8021 1040)
===================

Please help me to check the problem.
Thanks,
LiWang.

Well, I'm sure you'll have more chance with this one asking somebody from Freescale :-)

It does look like there may be a coherency problem but I don't know those chips well enough to tell

Cheers,
Ben.