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Bug 456443

Summary:	ptrace: reparent-zombie testcase FAILs
Product:	Red Hat Enterprise Linux 4	Reporter:	Jan Kratochvil <jan.kratochvil>
Component:	kernel	Assignee:	Vitaly Mayatskikh <vmayatsk>
Status:	CLOSED WONTFIX	QA Contact:	Martin Jenner <mjenner>
Severity:	high	Docs Contact:
Priority:	high
Version:	4.7	CC:	anton, drewelmore, jmarchan, riek, roland, vgoyal
Target Milestone:	rc
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2009-05-19 15:43:07 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:	461297

Description Jan Kratochvil 2008-07-23 18:00:14 UTC

Description of problem:
The testcase program
http://sources.redhat.com/cgi-bin/cvsweb.cgi/~checkout~/tests/ptrace-tests/tests/reparent-zombie.c?cvsroot=systemtap
should PASS as on F-9 (utrace) kernels and (reportedly) upstream 2.6.26+.
(/proc/PID/status should not be left Zombie for parents with SIG_IGN SIGCHLD.)

Version-Release number of selected component (if applicable):
kernel-smp-2.6.9-78.EL.x86_64

How reproducible:
Always.

Steps to Reproduce:
wget -O reparent-zombie.c
http://sources.redhat.com/cgi-bin/cvsweb.cgi/~checkout~/tests/ptrace-tests/tests/reparent-zombie.c?cvsroot=systemtap;
gcc -o reparent-zombie reparent-zombie.c -Wall -ggdb2 -D_GNU_SOURCE -pthread;
./reparent-zombie; echo $?

Actual results:
24649 left in State:	Z (zombie)
1

Expected results:
0

Additional info:
It was reported by Roland at http://sourceware.org/systemtap/wiki/utrace/tests
as "fixed upstream after 2.6.26".

reparent-zombie-clone testcase also FAILs but only with the same result as this
Bug's testcase reparent-zombie with no kernel crash.  IMO kernel crash was the
reason for reparent-zombie-clone so it should get fixed along by this Bug.

Comment 1 Vitaly Mayatskikh 2008-07-30 13:52:11 UTC

The bug is not reproducible not only in upstream kernel (2.6.27-rc1), but in F-9
(2.6.25.11-97) and RHEL-5 (2.6.18-92.1.6) also. I see it only in RHEL-4. Are you
sure about 2.6.26+?

Comment 2 Jan Kratochvil 2008-07-30 15:42:51 UTC

(In reply to comment #1)
> The bug is not reproducible not only in upstream kernel (2.6.27-rc1), but in
> F-9 (2.6.25.11-97) and RHEL-5 (2.6.18-92.1.6) also. I see it only in RHEL-4.
> Are you sure about 2.6.26+?

(My comment #0)
> It was reported by Roland at http://sourceware.org/systemtap/wiki/utrace/tests
> as "fixed upstream after 2.6.26".

I do not see any contradictions.
I agree with you that:

RHEL-4 is broken - This Bug.
RHEL-5 is OK (expecting due to utrace - instead of upstream ptrace)
F-9 is OK (expecting due to utrace - instead of upstream ptrace)
upstream 2.6.27-rc1 is OK (as Roland said it is fixed upstream after 2.6.26)
My test on 2.6.25.6-55.vanilla.fc9.x86_64 shows it is broken (as expected)

Comment 3 RHEL Program Management 2008-09-03 13:00:59 UTC

Updating PM score.

Comment 4 Linda Wang 2009-04-07 13:30:06 UTC

move back to ASSI, the patch posted need follow up after Roland's feedback.