Bug 245938

Summary:	[RHEL4 Xen]: Enable Systemtap
Product:	Red Hat Enterprise Linux 4	Reporter:	Chris Lalancette <clalance>
Component:	kernel-xen	Assignee:	Chris Lalancette <clalance>
Status:	CLOSED ERRATA	QA Contact:	Martin Jenner <mjenner>
Severity:	low	Docs Contact:
Priority:	low
Version:	4.5	CC:	ddomingo, ddutile, xen-maint
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	RHBA-2007-0791	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2007-11-15 16:29:28 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	248673

Description Chris Lalancette 2007-06-27 14:50:30 UTC

Description of problem:
It seems that Systemtap is currently disabled on RHEL-4 Xen.  We at least need
to turn on CONFIG_KPROBES, and possibly some other options, to get this working.

Comment 1 Chris Lalancette 2007-06-27 14:52:04 UTC

An example program that currently fails:

probe begin {
	log("Hello World");
	exit();
}

Failure messages:

In file included
from /tmp/stapdAF1BP/stap_885c7cb3746af32673d0ab75f63f8db7_313.c:36:
/usr/share/systemtap/runtime/stack.c:73: warning: "struct
kretprobe_instance" declared inside parameter list
/usr/share/systemtap/runtime/stack.c:73: warning: its scope is only this
definition or declaration, which is probably not what you want
/usr/share/systemtap/runtime/stack.c: In function `_stp_stack_sprint':
/usr/share/systemtap/runtime/stack.c:79: error: dereferencing pointer to
incomplete type
/usr/share/systemtap/runtime/stack.c:81: error: dereferencing pointer to
incomplete type

Comment 2 Chris Lalancette 2007-06-27 17:05:35 UTC

FWIW, I've built a i686 tree locally with CONFIG_KPROBES turned on, and it seems
to at least have built and executed the simple "Hello World" module.  So it may
be as simple as just turning that configuration option on for both i386 and x86_64.

Chris Lalancette

Comment 4 RHEL Program Management 2007-06-27 20:34:33 UTC

This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release.  Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products.  This request is not yet committed for inclusion in an Update
release.

Comment 5 Jason Baron 2007-07-03 22:44:01 UTC

committed in stream U6 build 55.16. A test kernel with this patch is available
from http://people.redhat.com/~jbaron/rhel4/

Comment 6 Red Hat Bugzilla 2007-07-25 00:53:14 UTC

change QA contact

Comment 8 Don Domingo 2007-08-23 04:16:58 UTC

added to RHEL4.6 release notes under "Kernel-Related Updates":

<quote>
CONFIG_KPROBES is now enabled to provide support for Systemtap
</quote>

please advise if any revisions are necessary. thanks!

Comment 10 errata-xmlrpc 2007-11-15 16:29:28 UTC

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2007-0791.html