Bug 309461 – utrace: tkill(SIGCONT) is not reported by waitpid() under ptrace

Bug 309461 - utrace: tkill(SIGCONT) is not reported by waitpid() under ptrace

Summary:	utrace: tkill(SIGCONT) is not reported by waitpid() under ptrace

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 5
Classification:	Red Hat
Component:	kernel (Show other bugs)
Sub Component:
Version:	5.1
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	beta
Target Release:	---
Assigned To:	Roland McGrath
QA Contact:	Martin Jenner
Docs Contact:

URL:
Whiteboard:
Keywords:	Regression

Depends On:	248532
Blocks:	425461
	Show dependency tree / graph

Reported:	2007-09-27 14:00 EDT by Jan Kratochvil
Modified:	2008-05-21 10:56 EDT (History)
CC List:	1 user (show)

See Also:
Fixed In Version:	RHBA-2008-0314
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2008-05-21 10:56:33 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
Testcase. (5.87 KB, text/plain) 2007-09-27 14:00 EDT, Jan Kratochvil	no flags	Details
Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHBA-2008:0314	normal	SHIPPED_LIVE	Updated kernel packages for Red Hat Enterprise Linux 5.2	2008-05-20 14:43:34 EDT

Groups: None (edit)

Description Jan Kratochvil 2007-09-27 14:00:19 EDT

+++ This bug was initially created as a clone of Bug #248532 +++

Description of problem:
Behavior change from the upstream.  It affects the method I found out as the
minimal/reliable way to attach unstopped+stopped processes on upstream kernels:
http://www.jankratochvil.net/priv/ver5.txt
* kill(SIGSTOP) the child
* waitid() (waitpid()) on it to catch its SIGSTOP notification
* PTRACE_ATTACH
* tkill(SIGCONT)
* waitpid() - should not hang

Version-Release number of selected component (if applicable):
kernel-2.6.18-48.el5.x86_64

How reproducible:
Always.

Steps to Reproduce:
1. gcc -o attach-sigcont-wait attach-sigcont-wait.c -Wall -ggdb2
2. ./attach-sigcont-wait

Actual results:
Aborted
(due to a timeout on hung waitpid())

Expected results:
PASS

Comment 1 Jan Kratochvil 2007-09-27 14:00:19 EDT

Created attachment 208791 [details]
Testcase.

Comment 3 Jan Kratochvil 2007-11-16 18:43:34 EST

Already fixed in the original Fedora Bug 248532.

Comment 4 Eric Bachalo 2007-12-14 15:36:47 EST

Roland is/will be working on this issue.

Comment 5 RHEL Product and Program Management 2007-12-14 15:37:23 EST

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 7 Don Zickus 2007-12-21 15:18:00 EST

in 2.6.18-62.el5
You can download this test kernel from http://people.redhat.com/dzickus/el5

Comment 9 Mike Gahagan 2008-01-28 16:24:55 EST

Confirmed attach-sigcont-wait now passes with the -75.el5 kernel

Comment 11 errata-xmlrpc 2008-05-21 10:56:33 EDT

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-2008-0314.html

Note You need to log in before you can comment on or make changes to this bug.