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Date: Sat, 1 Dec 2007 03:37:50 -0800
From: Jeremy Chadwick <koitsu@FreeBSD.org>
To: Johan =?iso-8859-1?Q?Str=F6m?= <johan@headweb.com>
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Cc: freebsd-fs@freebsd.org, freebsd-current@freebsd.org,
	freebsd-stable@freebsd.org
Subject: Re: scrambled (gmirror) dmesg output
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On Sat, Dec 01, 2007 at 12:16:45PM +0100, Johan Ström wrote:
> Hello
> Im playing with a new box running RELENG_7.0 from yesterday. I got two 
> discs with gmirror on ad[6|14]s1a and zfs-mirror on s1d. When o do 
> atacontrol detach ata7 (detach ad14), i get this in dmesG:
>
> (first time)
> subdisk14: detached
> ad14: detached
> GEOM_MIRROR: Device gm1b: provider ad14s1bG dEiOsMc_oMnInReRcOtRe:d .De
> vice gm1: provider ad14s1a disconnected.
>
> (second time, detaching again after reattach)
> subdisk14: detached
> ad14: detached
> GEOMG_EMOIMR_RMOIRR:R ORD:e viDceev icgem 1bg:m 1p:r opvriodveird era 
> d1a4ds114bs 1dai sdciosncnoencnteecdt.ed.
>
> huh? :) Some print raceing or something?

The problem isn't specific to GEOM or ZFS.  It's a known issue with two
kernel printf()s being called simultaneously.  There are older threads
discussing the issue.  I can dig up URLs if you want to read them, but I
don't have them available quickly...

-- 
| Jeremy Chadwick                                    jdc at parodius.com |
| Parodius Networking                           http://www.parodius.com/ |
| UNIX Systems Administrator                      Mountain View, CA, USA |
| Making life hard for others since 1977.                  PGP: 4BD6C0CB |