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Date: Wed, 4 Feb 2009 18:51:02 +0200 (EET)
From: Diomidis Spinellis <dds@freebsd.org>
Reply-To: Diomidis Spinellis <dds@freebsd.org>
To: FreeBSD-gnats-submit@freebsd.org
Cc:
Subject: truss -f fails to attach to child processes
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>Number:         131369
>Category:       bin
>Synopsis:       truss(1): truss -f fails to attach to child processes
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    delphij
>State:          analyzed
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Feb 04 17:10:01 UTC 2009
>Closed-Date:    
>Last-Modified:  Tue May 12 13:43:53 UTC 2009
>Originator:     Diomidis Spinellis
>Release:        FreeBSD 8.0-CURRENT i386
>Organization:
AUEB
>Environment:
System: FreeBSD icarian.dmst.aueb.gr 8.0-CURRENT FreeBSD 8.0-CURRENT #4 r188112M: Wed Feb 4 10:58:38 EET 2009 dds@icarian.dmst.aueb.gr:/usr/obj/usr/home/dds/src/fbsd-svn/base/head/sys/ICARIAN i386


>Description:
	The truss(1) command provides a -f flag to trace child processes of
	the process being traced.  This doesn't work: the child process isn't
	traced and a child of truss(1) is left spinning in the background.
	If the command is short-lived, then no child truss is left behind,
	and truss reports:
	truss: can not attach to target process: No such process


>How-To-Repeat:
	truss -f sh -c 'jot 100000 >foo'
	truss -f sh -c /bin/echo hi

>Fix:
	In r168569 when truss(1) started using ptrace(2) instead of
	procfs it no longer set PF_FORK.  We need to reintroduce a
	way to set PF_FORK, via a ptrace SETOPTIONS argument.

>Release-Note:
>Audit-Trail:
State-Changed-From-To: open->analyzed 
State-Changed-By: dds 
State-Changed-When: Fri Mar 27 07:00:28 UTC 2009 
State-Changed-Why:  
Problem analyzed and fix proposed. 



Responsible-Changed-From-To: freebsd-bugs->dds 
Responsible-Changed-By: dds 
Responsible-Changed-When: Fri Mar 27 07:00:28 UTC 2009 
Responsible-Changed-Why:  
Problem analyzed and fix proposed. 


http://www.freebsd.org/cgi/query-pr.cgi?pr=131369 
Responsible-Changed-From-To: dds->delphij 
Responsible-Changed-By: dds 
Responsible-Changed-When: Tue May 12 13:40:04 UTC 2009 
Responsible-Changed-Why:  
Turned over to delphij as the problem is associated with kernel 
changes he performed and dds's proposed fix (reinstating the ioctl 
functionality through ptrace) didn't work. 


http://www.freebsd.org/cgi/query-pr.cgi?pr=131369 
>Unformatted:
