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Date: Mon, 23 Feb 2009 01:06:04 -0500
From: Yoshihiro Ota <ota@j.email.ne.jp>
To: Steve Wills <steve@mouf.net>, Daichi GOTO <daichi@freebsd.org>
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Cc: stable@freebsd.org, Masanori OZAWA <ozawa@ongs.co.jp>
Subject: Re: unionfs panic in 7.1
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On Sat, 21 Feb 2009 18:35:16 +0900
Daichi GOTO <daichi@freebsd.org> wrote:

> Steve Wills wrote:
> > Hi,
> > 
> > I've found an reproducable panic in unionfs on 7.1-R.
> > 
> > /usr/src/sys/fs/unionfs/union_subr.c is:
> >      $FreeBSD: src/sys/fs/unionfs/union_subr.c,v 1.92.2.7.2.2 2008/12/15 
> > 03:58:55 daichi Exp $
> > 
> > kgdb output is below.
> > 
> > I reproduce this by unionfs mounting a ports dir used by the ports 
> > tinderbox. If anyone would like more info, please let me know, I have 
> > the core around, and can reproduce, help debug, resend in case my mailer 
> > has mangled this, etc.
> 
> I have some research around that issue.
> 
> First I should say, I cannot judge that unionfs leads
> that problem or not. JIMO, I guess that is not depends
> on unionfs itself. Very similar panis is reported without
> unionfs. At least, I cannot figure out what is the main
> cause of this problem. sorry.

I wonder if it is one of LORs, http://sources.zabbadoz.net/freebsd/lor.html

If you can try on 8-CURRENT and reproduce, it may provide you better info.

Regards,
Hiro