NetBSD Problem Report #43426

From gson@gson.org  Sun Jun  6 18:31:15 2010
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Date: Sun,  6 Jun 2010 21:31:10 +0300 (EEST)
From: gson@gson.org (Andreas Gustafsson)
Reply-To: gson@gson.org (Andreas Gustafsson)
To: gnats-bugs@gnats.NetBSD.org
Subject: net/miredo loops
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>Number:         43426
>Category:       pkg
>Synopsis:       net/miredo loops
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Jun 06 18:35:00 +0000 2010
>Last-Modified:  Wed Aug 15 18:55:10 +0000 2012
>Originator:     Andreas Gustafsson
>Release:        NetBSD 5.99.28
>Organization:
>Environment:
System: NetBSD dehum.gson.org 5.99.28 NetBSD 5.99.28 (DEHUM) #1: Sat May 1 19:24:32 EEST 2010 root@guru.araneus.fi:/usr/build/1090/obj/sys/arch/i386/compile/DEHUM i386
Architecture: i386
Machine: i386
>Description:

If I install net/miredo 1.1.7nb1 from pkgsrc and run the "miredo"
command (using the default configuration files), one of the miredo
processes enters a loop where it uses all available CPU.  Running
miredo under "ktrace -i" shows it calling readv() on a tun device
in a tight loop:

 16548      1 miredo   NAMI  "/dev/tun1"
 16548      1 miredo   RET   open 5
 [...]
 16548      5 miredo   RET   readv -1 errno 64 Host is down
 16548      5 miredo   CALL  readv(5,0xbb1efa6c,2)
 16548      5 miredo   RET   readv -1 errno 64 Host is down
 16548      5 miredo   CALL  readv(5,0xbb1efa6c,2)

This happens under both -current (5.99.28) and the 5.0.1 release.

>How-To-Repeat:

Install net/miredo 1.1.7nb1, run the command "miredo" as root, and
watch your CPU usage go to 100%.

>Fix:

>Audit-Trail:
From: Sergey Svishchev <svs@ropnet.ru>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: pkg/43426
Date: Thu, 23 Feb 2012 22:09:25 +0400

 Does your sysmem have complete v6 support (i.e. do you have ping6)?

 -- 
 Sergey Svishchev

From: Andreas Gustafsson <gson@gson.org>
To: Sergey Svishchev <svs@ropnet.ru>
Cc: gnats-bugs@NetBSD.org
Subject: Re: pkg/43426
Date: Thu, 23 Feb 2012 22:09:00 +0200

 Sergey Svishchev wrote:
 >  Does your sysmem have complete v6 support (i.e. do you have ping6)?

 It's a default NetBSD install, so yes.  For example, I can ping6 the
 loopback:

   $ ping6 ::1
   PING6(56=40+8+8 bytes) ::1 --> ::1
   16 bytes from ::1, icmp_seq=0 hlim=64 time=0.219 ms
   16 bytes from ::1, icmp_seq=1 hlim=64 time=0.198 ms
   ^C
   --- ::1 ping6 statistics ---
   2 packets transmitted, 2 packets received, 0.0% packet loss
   round-trip min/avg/max/std-dev = 0.198/0.209/0.219/0.015 ms

 -- 
 Andreas Gustafsson, gson@gson.org

From: Sergey Svishchev <svs@ropnet.ru>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: pkg/43426
Date: Wed, 15 Aug 2012 22:44:53 +0400

 miredo loops for me, too.  This should really be reported upstream.

 -- 
 Sergey Svishchev

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