Bug 669429

Summary:	[Errata testing] numa_faults.stp example hangs the box on ia64 & x86_64
Product:	Red Hat Enterprise Linux 4	Reporter:	Petr Muller <pmuller>
Component:	systemtap	Assignee:	Frank Ch. Eigler <fche>
Status:	CLOSED WONTFIX	QA Contact:	qe-baseos-tools-bugs
Severity:	medium	Docs Contact:
Priority:	medium
Version:	4.9	CC:	ohudlick
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2011-01-13 18:05:20 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:

Description Petr Muller 2011-01-13 16:47:22 UTC

Description of problem:
numa_faults.stp example (which is run as part of the testsuite) hangs the box when run.

Version-Release number of selected component (if applicable):
systemtap-1.3-4.el4

How reproducible:
always

Steps to Reproduce:
1. stap -v -c 'sleep 0.2' /usr/share/systemtap/testsuite/systemtap.examples/memory/numa_faults.stp
  
Actual results:
the box stops responding immediatelly after 'Pass 5: starting run.' and I cannot ping or ssh it again:

# stap -v -c 'sleep 0.2' /usr/share/systemtap/testsuite/systemtap.examples/memory/numa_faults.stp 
Pass 1: parsed user script and 72 library script(s) using 50656virt/20304res/2240shr kb, in 210usr/20sys/351real ms.
Pass 2: analyzed script: 3 probe(s), 6 function(s), 2 embed(s), 4 global(s) using 108448virt/37488res/3164shr kb, in 150usr/350sys/6515real ms.
Pass 3: translated to C into "/tmp/stap5kUO48/stap_90ec3fc1e332cc51011297f58409f44c_3422.c" using 107260virt/39820res/5428shr kb, in 410usr/90sys/550real ms.
Pass 4: compiled C into "stap_90ec3fc1e332cc51011297f58409f44c_3422.ko" in 1170usr/120sys/2925real ms.
Pass 5: starting run.
Starting pagefault counters 

Expected results:
no badness

Additional info:
this appeared before the death of the system in /var/log/messages:
Jan 13 11:19:38 hp-bl260cg5-01 kernel: Unable to handle kernel paging request at 00000000000018f0 RIP:

Old 4.8 systemtap does not even compile this systemtap script, so it is not a real regression, but if it could be avoided, it would be better

Comment 1 Frank Ch. Eigler 2011-01-13 17:52:15 UTC

This could be a problem with some tapset embedded-C, or perhaps
some basic ia64 kprobes problem.  On account of systemtap still
being a tech-preview on rhel4/ia64, I propose to WONTFIX this
for now.

Comment 2 Frank Ch. Eigler 2011-01-13 17:52:53 UTC

(same applies for x86-64; kprobes are not super robust on rhel4).

Comment 3 RHEL Program Management 2011-01-13 18:05:20 UTC

Development Management has reviewed and declined this request.  You may appeal
this decision by reopening this request.