sounds like the same error we got from David Hemmo a while back. which OS are you using ? (distro version and kernel version) A+
I am running Fedora Core 4 kernel 2.6.12-1.1390_FC4 amd64 but it happens also with vanilla 2.6.12 kernel. Thanks
Normally, fixes for ptrace in kernel have been included in 2.6.12 for x86_64... Sounds like it still doesn't work as expected... This should be reported to LKML IMO.
A+