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Bug 157239

Summary:	Systemtap patches to be ported to RHEL4 U2 kernel
Product:	Red Hat Enterprise Linux 4	Reporter:	Elena Zannoni <ezannoni>
Component:	kernel	Assignee:	Jason Baron <jbaron>
Status:	CLOSED ERRATA	QA Contact:	Brian Brock <bbrock>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	4.0	CC:	davej, ezannoni, hunt, knoel, poelstra, wcohen
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	RHSA-2005-514	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2005-10-05 13:05:12 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:	156322, 157421

Description Elena Zannoni 2005-05-09 17:57:18 UTC

There are a number of kprobes related patches making their way upstream for
Systemtap support.
They need to be included in RHEL4 U2.

The list is:

[1]
[PATCH] Kprobes: Allow/deny probes on int3/breakpoint instruction?
http://www.ussg.iu.edu/hypermail/linux/kernel/0503.3/1965.html
This patch is required. It has been integrated upstream.

[2]
[PATCH] Kprobes: Incorrect handling of probes on ret/lret instruction
http://www.ussg.iu.edu/hypermail/linux/kernel/0504.0/0045.html
This patch is upstream. Needed in RHEL.

[3]
[PATCH] Kprobes: Oops! in unregister_kprobe()
http://www.ussg.iu.edu/hypermail/linux/kernel/0504.1/0826.html
Patch upstream - needs to go into RHEL.

[4]
[RFC] [PATCH] Multiple kprobes at an address
http://www.ussg.iu.edu/hypermail/linux/kernel/0504.2/0492.html
Patch upstream. Needed in RHEL

[5]
[RCF][PATCH] kprobes: function-return probes
http://www.ussg.iu.edu/hypermail/linux/kernel/0505.0/1107.html
Awaiting community comments. Feature needed in RHEL. Also, this
feature is arch specific.

There are other changes that are not captured as part of the list since
they are still in the works. We are working on getting these done ASAP:

- Reentrant probe handling
- Kprobe scalability changes
- kprobe-jprobe coexistance

Also relayfs patches are needed (don't have the details on those yet)

Comment 1 Elena Zannoni 2005-05-09 19:49:14 UTC

Relayfs patch needing backport is this one:

[PATCH 2.6.12-rc1-mm2] relayfs: properly handle oversized events
http://www.uwsg.iu.edu/hypermail/linux/kernel/0503.3/0248.html

Comment 2 Dave Jones 2005-05-18 03:35:37 UTC

you seem to be under the impression that relayfs is present in RHEL4.
It isn't.  It isn't even merged in current upstream.

Comment 3 Martin Hunt 2005-05-18 05:41:15 UTC

relayfs is one of two modules we will need (the other is stp_control) to build
for each kernel. Both are checked into the systemtap cvs.  I have applied the
above patch to relayfs.

Comment 10 Elena Zannoni 2005-07-01 19:58:29 UTC

Patches have been submitted to rhkernel-list.

Comment 15 Red Hat Bugzilla 2005-10-05 13:05:13 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/RHSA-2005-514.html