Date: Fri, 4 Sep 2015 10:04:25 +0000 (UTC) From: John Dison <jdison16@yahoo.com> To: "hackers@freebsd.org" <hackers@freebsd.org> Subject: Kernel crash dumps and swap Message-ID: <74900131.1451330.1441361065012.JavaMail.yahoo@mail.yahoo.com>
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Hello,according to=C2=A0Chapter=C2=A010.=C2=A0Kernel Debugging "The=C2=A0dumpon(8)=C2=A0program must be called after the swap partition ha= s been configured with=C2=A0swapon(8)." This sounds ridiculous: why should I enable swap in my system in order to b= e able to obtain a crash dump?Isn't it a mistake in documentation? I understand that I must label swap partition, but actually *enabling* swap= looks unrelated to crash dumps. Thanks. From owner-freebsd-hackers@freebsd.org Fri Sep 4 10:28:38 2015 Return-Path: <owner-freebsd-hackers@freebsd.org> Delivered-To: freebsd-hackers@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 82FF69C9A23 for <freebsd-hackers@mailman.ysv.freebsd.org>; Fri, 4 Sep 2015 10:28:38 +0000 (UTC) (envelope-from killing@multiplay.co.uk) Received: from mail-wi0-f182.google.com (mail-wi0-f182.google.com [209.85.212.182]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 243311904 for <freebsd-hackers@freebsd.org>; Fri, 4 Sep 2015 10:28:37 +0000 (UTC) (envelope-from killing@multiplay.co.uk) Received: by wiclk2 with SMTP id lk2so13089482wic.1 for <freebsd-hackers@freebsd.org>; Fri, 04 Sep 2015 03:28:30 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:subject:to:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-type :content-transfer-encoding; bh=2+QubvquJB23KHRHlyZa6uZtJg5mfjTH83fius/P018=; b=EQOYfp6kHjJ9/XlB5pvStDobGHECUloawUWhivOePs09MQICZKAJZcQRqAIBTS73x/ XmTB65aUySjnXF7QiWHTupgWRSF7mkhxtE7zXjnSQ7T6MK1W6Qrxf0duJTi5Q/cUSLFg PXPaJA5K8U616r/L2NzN0bzXHT6p2ckK0DBQ6dVpc1AQl6dVZL2w3xB8vtxVYBwHEE57 aEVFY/d3+vqWxk1zQBhi1QTqc0bjZllBT3vyQLUEUEC7yqvPWkxI6yZjEtrbGfNJ0/qU XPeMIfy9a3FFr5P7RCQE70H63oB3nv7tnS/Mb8LmkVU/m2gHCKPfiGX588DxH4qv25DA lZ6g== X-Gm-Message-State: ALoCoQmlN7/ACxNSvfO+d1g6q52TZ5WtvoSA4Y+CAt4GKBw5CtpDKXkp+H9kMFDwac1aCsb9CSDF X-Received: by 10.180.19.9 with SMTP id a9mr6131150wie.5.1441362510470; Fri, 04 Sep 2015 03:28:30 -0700 (PDT) Received: from [10.10.1.68] (82-69-141-170.dsl.in-addr.zen.co.uk. [82.69.141.170]) by smtp.gmail.com with ESMTPSA id v8sm3229549wjr.15.2015.09.04.03.28.29 for <freebsd-hackers@freebsd.org> (version=TLSv1/SSLv3 cipher=OTHER); Fri, 04 Sep 2015 03:28:29 -0700 (PDT) Subject: Re: Kernel crash dumps and swap To: freebsd-hackers@freebsd.org References: <74900131.1451330.1441361065012.JavaMail.yahoo@mail.yahoo.com> From: Steven Hartland <killing@multiplay.co.uk> Message-ID: <55E97248.80009@multiplay.co.uk> Date: Fri, 4 Sep 2015 11:28:24 +0100 User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:38.0) Gecko/20100101 Thunderbird/38.2.0 MIME-Version: 1.0 In-Reply-To: <74900131.1451330.1441361065012.JavaMail.yahoo@mail.yahoo.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Technical Discussions relating to FreeBSD <freebsd-hackers.freebsd.org> List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-hackers>, <mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe> List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers/>; List-Post: <mailto:freebsd-hackers@freebsd.org> List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help> List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, <mailto:freebsd-hackers-request@freebsd.org?subject=subscribe> X-List-Received-Date: Fri, 04 Sep 2015 10:28:38 -0000 That's correct as the default for dumpdev="auto" in rc.conf is for dump to use swap devices, so in order for dump to locate a device to dump to in this case swap must be enabled. Regards Steve On 04/09/2015 11:04, John Dison via freebsd-hackers wrote: > Hello,according to Chapter 10. Kernel Debugging > "The dumpon(8) program must be called after the swap partition has been configured with swapon(8)." > > This sounds ridiculous: why should I enable swap in my system in order to be able to obtain a crash dump?Isn't it a mistake in documentation? > I understand that I must label swap partition, but actually *enabling* swap looks unrelated to crash dumps. > Thanks. > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org"
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