Re: [CentOS] strace issue in 5.5?

on 13:29 Sat 19 Feb, Eric Gerzon (ericgerzon@gmail.com) wrote:

Hello,

I am trying to get some more information about the following issue:

# strace -p 2256 attach: ptrace(PTRACE_ATTACH, ...): Operation not permitted

As root? (Prompt suggests yes).

Is another strace attached to the process already (or gdb session)?

Some kernel hardening / selinux features may interfere with this as well, though I don't know specifics.

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.