From owner-freebsd-questions@FreeBSD.ORG Fri Apr 6 18:13:17 2012 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id B3D671065672 for ; Fri, 6 Apr 2012 18:13:17 +0000 (UTC) (envelope-from Devin.Teske@fisglobal.com) Received: from mx1.fisglobal.com (mx1.fisglobal.com [199.200.24.190]) by mx1.freebsd.org (Postfix) with ESMTP id 7838E8FC15 for ; Fri, 6 Apr 2012 18:13:17 +0000 (UTC) Received: from pps.filterd (ltcfislmsgpa03 [127.0.0.1]) by ltcfislmsgpa03.fnfis.com (8.14.4/8.14.4) with SMTP id q36HQIn2030962; Fri, 6 Apr 2012 13:13:11 -0500 Received: from smtp.fisglobal.com ([10.132.206.16]) by ltcfislmsgpa03.fnfis.com with ESMTP id 141puwjked-3 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=NOT); Fri, 06 Apr 2012 13:13:11 -0500 Received: from dtwin (10.14.152.15) by smtp.fisglobal.com (10.132.206.16) with Microsoft SMTP Server (TLS) id 14.1.323.3; Fri, 6 Apr 2012 13:13:09 -0500 From: Devin Teske To: "'gahn'" , "'freebsd general questions'" References: <1333735492.43069.YahooMailNeo@web130205.mail.mud.yahoo.com> In-Reply-To: <1333735492.43069.YahooMailNeo@web130205.mail.mud.yahoo.com> Date: Fri, 6 Apr 2012 11:13:21 -0700 Message-ID: <08b701cd1420$f4e21a60$dea64f20$@fisglobal.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQFbTu7BJ/ePPQkSZQnF+VFqrVz8Y5dxoy2g Content-Language: en-us X-Originating-IP: [10.14.152.15] X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.6.7498, 1.0.260, 0.0.0000 definitions=2012-04-06_03:2012-04-05, 2012-04-06, 1970-01-01 signatures=0 Content-Type: text/plain; charset="iso-8859-1" Cc: Subject: RE: learning freebsd kernel X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 06 Apr 2012 18:13:17 -0000 > -----Original Message----- > From: owner-freebsd-questions@freebsd.org [mailto:owner-freebsd- > questions@freebsd.org] On Behalf Of gahn > Sent: Friday, April 06, 2012 11:05 AM > To: freebsd general questions > Subject: learning freebsd kernel >=20 > hi gurus: >=20 > how could i create the core dumps on freebsd kernel? i am trying to creat= e a > kernel core dump on 8.1 but it didn't happen: >=20 > # sysctl -w debug.kdb.panic=3D1 >=20 > well the system went panic, entered the mode db>. i did "reboot' but ther= e was > no core/kernel dumps under /var/crash. >=20 Did you set the "dumpdev" directive in /etc/rc.conf? % grep dumpdev /etc/defaults/rc.conf dumpdev=3D"NO" # Device name to crashdump to (or NO). savecore_flags=3D"" # Used if dumpdev is enabled above, and present. You should set the value of dumpdev to your swap device. You can get this value by executing the following: awk '$3~/swap/{print $1}' /etc/fstab Should produce something like "/dev/mfid0s1b" or "da0s1b" or "ada0s1b" or "ad0s1b" etc. depending on your RELEASE and hardware. If the output is, for example, "/dev/mfid0s1b", you should add the followin= g to /etc/rc.conf: dumpdev=3D"/dev/mfid0s1b" --=20 Devin > the customized kernel has those information enabled: >=20 > # Debugging for use in -current > options=A0=A0=A0=A0=A0=A0=A0=A0 KDB=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0= =A0=A0=A0=A0=A0=A0=A0=A0 # Enable kernel debugger support. > options=A0=A0=A0=A0=A0=A0=A0=A0 DDB=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0= =A0=A0=A0=A0=A0=A0=A0=A0 # Support DDB. > options=A0=A0=A0=A0=A0=A0=A0=A0 GDB=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0= =A0=A0=A0=A0=A0=A0=A0=A0 # Support remote GDB. >=20 > user@host:~:$ sysctl -a | grep debug.kdb > debug.kdb.stop_cpus: 1 > debug.kdb.trap_code: 0 > debug.kdb.trap: 0 > debug.kdb.panic: 0 > debug.kdb.enter: 0 > debug.kdb.current: ddb > debug.kdb.available: ddb >=20 >=20 >=20 > by the way, where is my gdb? on one of my company's machisne, it looks li= ke > this: >=20 > debug.kdb.available: ddb gdb >=20 > thank you all >=20 > /gahn > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.o= rg" _____________ The information contained in this message is proprietary and/or confidentia= l. If you are not the intended recipient, please: (i) delete the message an= d all copies; (ii) do not disclose, distribute or use the message in any ma= nner; and (iii) notify the sender immediately. In addition, please be aware= that any message addressed to our domain is subject to archiving and revie= w by persons other than the intended recipient. Thank you.