Date: Tue, 21 Jun 2011 10:17:19 -0600 From: "Kenneth D. Merry" <ken@freebsd.org> To: Andrey Chernov <ache@freebsd.org>, Kostik Belousov <kostikbel@gmail.com>, "Justin T. Gibbs" <gibbs@freebsd.org>, Eir Nym <eirnym@gmail.com>, current@freebsd.org, will@freebsd.org Subject: Re: Exactly that commit (was Re: Latest -current 100% hang at the late boot stage) Message-ID: <20110621161719.GA16166@nargothrond.kdm.org> In-Reply-To: <20110620114656.GA83524@vniz.net> References: <20110619160148.GA35431@vniz.net> <BANLkTim5CyWOHThk45tgvMgcivF54QNuHQ@mail.gmail.com> <20110619165328.GA35872@vniz.net> <BANLkTimCegAu0ERJyLaCqen0=F%2BbWMDBNw@mail.gmail.com> <20110619232307.GA57530@vniz.net> <20110620001912.GA60252@vniz.net> <4DFEAD4F.1040603@FreeBSD.org> <20110620070222.GA74009@vniz.net> <20110620080146.GF48734@deviant.kiev.zoral.com.ua> <20110620114656.GA83524@vniz.net>
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On Mon, Jun 20, 2011 at 15:46:56 +0400, Andrey Chernov wrote: > On Mon, Jun 20, 2011 at 11:01:46AM +0300, Kostik Belousov wrote: > > On Mon, Jun 20, 2011 at 11:02:22AM +0400, Andrey Chernov wrote: > > > On Sun, Jun 19, 2011 at 08:15:43PM -0600, Justin T. Gibbs wrote: > > > > On 6/19/11 6:19 PM, Andrey Chernov wrote: > > > > > Exactly that commit is responsible for boot hang. > > > > > Please fix. > > > > > BTW, I have MBR on SATA disk (CAM emulated), ICH9. > > > > > > > > Since it works for me, you'll need to provide more information. Can you > > > > at least drop into kdb to determine the likely source of the hang by > > > > getting a stack trace of all processes to see where they are sleeping > > > > and dumping lock information? > > > > > > I drop into DDB and put 'bt' console photo in the very first message of > > > this thread - nothing unusual seen in the main stack. Could you please > > > specify exact DDB commands you want to be issued by me? No dump can be > > > provided since nothing is mounted yet including swap, > > > > > > BTW, I remember I saw previously unseen warnings with post Jun 14 kernels: > > > "xpt_action_default: CCB type 0xe not supported" > > > > > > 'ps' inside DDB shows [xpt_thrd] at "ccb_scan" wmesg state and [g_event] > > > at "caplck" wmesg state, [kernel] at "g_waitid" state. > > > Even don't know, if it matters. > > > > Just in case, please try r223277. > > As the second message in the thread states, I try first even 223296 with > the same hang and the same > xpt_action_default: CCB type 0xe not supported > As I think, DDB's 'ps' indicates that kernel waits something from geom and > geom waits something from ccb_scan forever, just raw guess. I will be glad to > issue more specific DDB commands and upload corresponding photos. > BTW, pluging and unplugging USB devides works in that stage. Can you do the following when the hang happens: ps alltrace show locks show msgbuf Hopefully that will give us something to start looking at... This would really work a lot better if there is any way to get a serial console on the machine. The above will produce a good bit of output, and would likely need a lot of pictures. Since we can't reproduce the problem here, some debugging help would be greatly appreciated. Thanks, Ken -- Kenneth Merry ken@FreeBSD.ORG
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