[Bug documentation/16645] New: Useless feedback when stap fails

["hadess at hadess dot net" <sourceware-bugzilla at sourceware dot org>]

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

            Bug ID: 16645
           Summary: Useless feedback when stap fails
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: documentation
          Assignee: systemtap at sourceware dot org
          Reporter: hadess at hadess dot net

http://sourceware.org/systemtap/SystemTap_Beginners_Guide/using-systemtap.html#testing
says:
run the command stap -v -e 'probe vfs.read {printf("read performed\n");
exit()}'.
etc.

Running that command yields:
$ stap -v -e 'probe vfs.read {printf("read performed\n"); exit()}'
Using a compile server.
Unable to find a suitable compile server.
No servers online to select from.
Passes: via server ? using 187912virt/3700res/2976shr/660data kb, in
0usr/0sys/2007real ms.
Passes: via server failed.  Try again with another '-v' option.

I have no idea what that "compile server" is, I just ran this command as a
normal user that's in the stapusr group (based on the results of an earlier
failure to run):
uid=1000(hadess) gid=1000(hadess) groups=1000(hadess),10(wheel),156(stapusr)
context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023

Shouldn't the "setting up" section of the documentation mention the
requirements for running systemtap as a normal user for user-space
intrumentation? I simply couldn't figure it out...

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