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Date: Thu, 22 Sep 2005 12:30:39 GMT
From: Kwint <kwint@vianet.lt>
To: freebsd-gnats-submit@FreeBSD.org
Subject: arp program hangs
X-Send-Pr-Version: www-2.3

>Number:         86456
>Category:       bin
>Synopsis:       arp(8) program hangs
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          closed
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Sep 22 12:40:06 GMT 2005
>Closed-Date:    Fri Apr 27 09:53:31 GMT 2007
>Last-Modified:  Fri Apr 27 09:53:31 GMT 2007
>Originator:     Kwint
>Release:        FreeBSD 4.9-RELEASE
>Organization:
VIANET
>Environment:
FreeBSD gw.vianet.lt 4.9-RELEASE FreeBSD 4.9-RELEASE #7: Mon Aug 16 16:20:58 EEST 2004     kwint@gw.vianet:/usr/src/sys/compile/GATEWAY  i386
>Description:
arp -da hangs unpredictably.
I mean some two or three times it deletes arp entries, but then doing again arp -da it hangs in the middle of deleting arp enries. I found that it just loops in rtmsg(int cmd, struct sockaddr_inarp *dst, struct sockaddr_dl *sdl) function in this loop:

do {
                l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg));
} while (l > 0 && (rtm->rtm_seq != seq || rtm->rtm_pid != pid));
it gets rtm->rtm_seq=0 and rtm->rtm_pid=0 every time.
>How-To-Repeat:
do continuos arp -da, I did it in shell script
or, change /usr/sbin/arp source code to continuosly do arp -da
>Fix:
      
>Release-Note:
>Audit-Trail:

From: Maxim Konovalov <maxim@macomnet.ru>
To: Kwint <kwint@vianet.lt>
Cc: bug-followup@freebsd.org
Subject: Re: misc/86456: arp program hangs
Date: Thu, 22 Sep 2005 16:50:11 +0400 (MSD)

 [...]
 > >How-To-Repeat:
 > do continuos arp -da, I did it in shell script
 > or, change /usr/sbin/arp source code to continuosly do arp -da
 
 Are you sure this is not a problem with DNS?  Does arp -dan hang as
 well?
 
 -- 
 Maxim Konovalov
State-Changed-From-To: open->feedback 
State-Changed-By: bms 
State-Changed-When: Sun Sep 24 08:32:03 UTC 2006 
State-Changed-Why:  
Can the submitter reproduce this with arp -dan? 
I can't reproduce. 

http://www.freebsd.org/cgi/query-pr.cgi?pr=86456 
State-Changed-From-To: feedback->closed 
State-Changed-By: linimon 
State-Changed-When: Fri Apr 27 09:53:10 UTC 2007 
State-Changed-Why:  
Feedback timeout (>6 months). 

http://www.freebsd.org/cgi/query-pr.cgi?pr=86456 
>Unformatted:
