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Bug 75709

Summary:	strace -p leaves attached process in stopped state
Product:	[Retired] Red Hat Linux	Reporter:	Han Holl <han.holl>
Component:	strace	Assignee:	Roland McGrath <roland>
Status:	CLOSED RAWHIDE	QA Contact:	Brian Brock <bbrock>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	7.3	CC:	mgahagan, tao
Target Milestone:	---
Target Release:	---
Hardware:	i386
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2003-01-10 23:11:05 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:

Description Han Holl 2002-10-11 11:06:05 UTC

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.2b) Gecko/20021002

Description of problem:
See summary. Do strace -p on some daemon, detach with ctrl/c,
and do cat /proc/$(pidof daemon)/status
You see State: stopped
killall -CONT daemon continues the daemon.

Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1.See description
2.
3.
	

Additional info:

This happens with strace-4.4-4 and also with strace-4.4-8 (rawhide)
I'm amazed that no bug has been filed for this yet.
I've gone back tp strace-4.3-2 wich works fine.

Comment 1 Charlie Brady 2002-11-27 17:53:56 UTC

I get exactly the same thing, and am also amazed that this hasn't been reported
more widely:

sh-2.05a# ps fax | grep xinetd
 1200 ?        S      0:00 xinetd -stayalive -reuse -pidfile
/var/run/xinetd.pidsh-2.05a# strace -p1200
select(8, [3 5 6 7], NULL, NULL, NULL <unfinished ...>
sh-2.05a# ps fax | grep xinetd
 1200 ?        T      0:00 xinetd -stayalive -reuse -pidfile
/var/run/xinetd.pidsh-2.05a# kill -CONT 1200
sh-2.05a# ps fax | grep xinetd
 1200 ?        S      0:00 xinetd -stayalive -reuse -pidfile
/var/run/xinetd.pidsh-2.05a# 

sh-2.05a# rpm -q strace ; rpm -q kernel
strace-4.4-4
kernel-2.4.18-5
sh-2.05a#

Comment 2 Charlie Brady 2002-11-27 17:56:08 UTC

I don't see anything related in the strace changelog, but this might have been
cleared up in latest version from rawhide (at least when compiled from src
locally - I didn't try the binary from RedHat):

[root@vmware-charlieb root]# rpm -Uhv strace-4.4-9.1.i386.rpm 
Preparing...                ########################################### [100%]
   1:strace                 ########################################### [100%]
ps fax |[root@vmware-charlieb root]# ps fax | grep xinetd
 1167 ?        S      0:00 xinetd -stayalive -reuse -pidfile /var/run/xinetd.pid
2246 pts/1    S      0:00          \_ grep xinetd
[root@vmware-charlieb root]# strace -p1167
select(7, [3 5 6], NULL, NULL, NULL <unfinished ...>
[root@vmware-charlieb root]# ps fax | grep xinetd
 1167 ?        S      0:00 xinetd -stayalive -reuse -pidfile /var/run/xinetd.pid
2249 pts/1    S      0:00          \_ grep xinetd
[root@vmware-charlieb root]#

Comment 3 Roland McGrath 2002-12-18 04:19:34 UTC

*** Bug 79782 has been marked as a duplicate of this bug. ***

Comment 4 Roland McGrath 2002-12-18 04:20:34 UTC

I have a fix for this in the current upstream version and we will have
an errata version fixing it before too long.

Comment 5 Roland McGrath 2003-01-10 23:11:05 UTC

Version 4.4.91-1 should work fine.

Comment 6 Han Holl 2003-01-13 14:25:34 UTC

Works for me now.