From owner-freebsd-stable@FreeBSD.ORG Wed Oct 4 19:42:04 2006 Return-Path: X-Original-To: stable@freebsd.org Delivered-To: freebsd-stable@FreeBSD.ORG Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id C8DB916A580 for ; Wed, 4 Oct 2006 19:42:04 +0000 (UTC) (envelope-from kris@obsecurity.org) Received: from elvis.mu.org (elvis.mu.org [192.203.228.196]) by mx1.FreeBSD.org (Postfix) with ESMTP id 4030443D73 for ; Wed, 4 Oct 2006 19:41:49 +0000 (GMT) (envelope-from kris@obsecurity.org) Received: from obsecurity.dyndns.org (elvis.mu.org [192.203.228.196]) by elvis.mu.org (Postfix) with ESMTP id A689F1A4D82; Wed, 4 Oct 2006 12:41:49 -0700 (PDT) Received: by obsecurity.dyndns.org (Postfix, from userid 1000) id 96B3B51567; Wed, 4 Oct 2006 15:41:48 -0400 (EDT) Date: Wed, 4 Oct 2006 15:41:48 -0400 From: Kris Kennaway To: Vivek Khera Message-ID: <20061004194148.GA37672@xor.obsecurity.org> References: <917B087C-5E13-4D7F-94FA-95CB0E5C1884@khera.org> <20060922190328.GA64849@xor.obsecurity.org> <555B84D2-520F-44D6-84D6-CF9CE7EE47C7@khera.org> <20060922203654.GA65693@xor.obsecurity.org> <847DD3A5-D5DD-4D3E-B755-64B13D1DA506@khera.org> <20061003084315.GA89654@deviant.kiev.zoral.com.ua> <20061004140808.GD89654@deviant.kiev.zoral.com.ua> <20061004163944.GA35412@xor.obsecurity.org> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="azLHFNyN32YCQGCU" Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.2.2i Cc: Kostik Belousov , stable@freebsd.org Subject: Re: ffs snapshot lockup X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 04 Oct 2006 19:42:04 -0000 --azLHFNyN32YCQGCU Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Oct 04, 2006 at 01:06:37PM -0400, Vivek Khera wrote: >=20 > On Oct 4, 2006, at 12:39 PM, Kris Kennaway wrote: >=20 > >>> > >>>The only thing I think was running at the time would be a large file > >>>copy from a remote system to this one using rsync. > >> > >>As I understand, you got the panic. Then, you shall post the panic =20 > >>message. > >>If you have core file, then running kgdb on the core may show =20 > >>required > >>information. > >>(it shall be on the console exactly before en > >>and backtrace (using the bt command of ddb) of the paniced thread. > > > >YOu can also do 'show msgbuf' from DDB. > > >=20 > i ran kgdb on the vmcore file. since the dump was generated by =20 > calling doadump from DDB, the backtrace was showing the call stack of =20 > that. >=20 > from what i read in the output from kgdb, it seems that something =20 > locked the kernel and we broke to debugger from the watchdog timeout =20 > (I enable software watchdog). Hmm, be careful with that - if you set the timeout too low (and note that for some workloads O(minutes) may even be too low) then you'll get a lot of false positives. Kris --azLHFNyN32YCQGCU Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (FreeBSD) iD8DBQFFJA58Wry0BWjoQKURAr5dAKDf4YLcBJU9owRw6N1L3FcgJkvOOgCfRQkq bd8+tGZVB28bkYBN6KL7iO0= =B7Vl -----END PGP SIGNATURE----- --azLHFNyN32YCQGCU--