Bug 191463

Summary:	Bash appears to be mishandling sub-processes that use recycled PIDs
Product:	Red Hat Enterprise Linux 2.1	Reporter:	Tim Waugh <twaugh>
Component:	bash	Assignee:	Tim Waugh <twaugh>
Status:	CLOSED ERRATA	QA Contact:	Ben Levenson <benl>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	2.1	CC:	kmori, tao
Target Milestone:	---
Target Release:	---
Hardware:	i386
OS:	Linux
Whiteboard:
Fixed In Version:	RHBA-2006-0502	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2006-06-01 17:28:48 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:	145124
Bug Blocks:	143573

Description Tim Waugh 2006-05-12 08:42:03 UTC

+++ This bug was initially created as a clone of Bug #145124 +++

Description of problem:

Customer runs a BASH script that sleeps and executes tests in a loop.
Occasionally, sleep terminates prematurely, which causes errors.

From IT#60427:
I've found the interesting fact from strace log collected by my
reproduction. Whenever the problem happened, the pid which had been
used by the background job process right before was assigned to the
process. For instance, pid 29255 had been assigned to "test_sub.sh" in
test case at the first, nextly, it was assigned to "sleep". The sleep
process was dealed as background job. As the result, this problem
happened. In grep issue, this fact is applicable.

29255 21:28:53.966341 execve("/mnt/test/60427/testing/test_sub.sh",
["/mnt/test/60427/testing/test_sub"...], [/* 31 vars */] <unfinished ...>
229255 22:31:41.371266 execve("/bin/sleep", ["sleep", "10"], [/* 31
vars */] <unfinished ...>


Version-Release number of selected component (if applicable):
bash-2.05b-29


How reproducible:
Customer has supplied scripts that reproduce the problem, they are
attached to issue 61189.

Steps to Reproduce:
1. Run test scripts
2.
3.
  
Actual results:
Every now and then, sleep returns prematurely.

Expected results:
Sleep should not return prematurely.

Additional info:

Comment 4 Red Hat Bugzilla 2006-06-01 17:28:48 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-2006-0502.html