[Bug documentation/16645] Useless feedback when stap fails

[dsmith at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16645

--- Comment #3 from David Smith <dsmith at redhat dot com> ---
As Dave said, since you are only in the 'stapusr' group and not the 'stapdev'
group, you can only run "blessed" precompiled scripts from a stap compile
server or unprivileged scripts (scripts that just probe your own user exes for
instance).

The script you tried to use requires privilege (you'd need to be root or in the
'stapdev' group), since it probes all processes.

Kernel level probes (kernel.*) probes require privilege. The 'vfs.read' probe
is a probe alias that maps back to a kernel.function probe.

There is a section in the stap manpage called 'UNPRIVILEGED USERS' that
discusses this a bit.

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