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[Bug tapsets/9925] New: task_execname(task) incorrect in process.create


"task" in process.create is according to STAPPROBES.PROCESS(5):
 "a handle to the newly created process"

This seems to be true for some parts of "task" but not for all. The PID is
correct but execname is not (is actually the execname of the parent).

The following one-liner illustrates the issue:
 stap -e 'probe process.create { printf("currentpid: %d, newpid: %d,
newexecname: %s\n", pid(), task_pid(task), task_execname(task)) }'

With this running I started a few processes (/usr/bin/id, /bin/sleep) from my
bash resulting in:
 currentpid: 26872, newpid: 3156, newexecname: bash
 currentpid: 26872, newpid: 3157, newexecname: bash
 currentpid: 26872, newpid: 3158, newexecname: bash

In the data above currentpid (my bash) is correct, newpid (3156-3158) is also
correct. What's wrong is that newexecname should have been "id", "id", "sleep".

Tested on CentOS-5.3(QA) x86_64 (2.6.18-128.el5) with systemtap-0.7.2-2.el5 and
systemtap-20090228.

-- 
           Summary: task_execname(task) incorrect in process.create
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: tapsets
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: cap at nsc dot liu dot se


http://sourceware.org/bugzilla/show_bug.cgi?id=9925

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