From owner-freebsd-current@FreeBSD.ORG  Tue Jul 23 16:05:45 2013
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Message-ID: <51EEAA36.6030206@bitfrost.no>
Date: Tue, 23 Jul 2013 18:07:18 +0200
From: Hans Petter Selasky <hps@bitfrost.no>
Organization: Bitfrost A/S
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To: Jia-Shiun Li <jiashiun@gmail.com>
Subject: Re: Panic at USB drive plugging in
References: <CAHNYxxNwhAJChd0=DErbBguqjoPFgfYDFjv-CRzi1WNDdUvExw@mail.gmail.com>
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Cc: Alexander Motin <mav@FreeBSD.org>, freebsd-current@freebsd.org
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On 07/23/13 17:12, Jia-Shiun Li wrote:
> Hi all,
>
> as personal preference I compiled kernel with drivers as module as
> possible. Recently I found that plugging in USB drives causes kernel
> to panic. But it does not happen when booting with GENERIC kernel
> which has USB drivers compiled in.
>
> panic screenshot:
> http://goo.gl/pIIDaF
>
> back trace:
> http://goo.gl/ww4yy6
>
> the kernel is compiled:
> FreeBSD 4cbsd 10.0-CURRENT FreeBSD 10.0-CURRENT #1 r253395: Fri Jul 19
> 15:20:08 CST 2013     jsli@4cbsd:/usr/obj/usr/src/sys/Minimal  amd64
>
> the back trace looks like devd and something had timing issues. Any ideas?
>

Hi,

This looks like a CAM/SCSI problem and not directly USB stack problem.

--HPS