Hello, I am trying to get some more information about the following issue: # strace -p 2256 attach: ptrace(PTRACE_ATTACH, ...): Operation not permitted I am trying to trace an mdadm re-sync pid and I keep getting the above error. I have done some digging on google and forums, but have not had much luck. Redhat-release says CentOS release 5.5 (Final) uname: 2.6.18-194.32.1.el5 Any help would be great. -Eric -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20110219/ccdad9bb/attachment-0004.html>