From owner-freebsd-hackers@freebsd.org Sun Mar 14 00:41:05 2021 Return-Path: Delivered-To: freebsd-hackers@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id AB90456AE94 for ; Sun, 14 Mar 2021 00:41:05 +0000 (UTC) (envelope-from freebsd-hackers@m.gmane-mx.org) Received: from ciao.gmane.io (ciao.gmane.io [116.202.254.214]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4Dyghc4Cxtz3vsj for ; Sun, 14 Mar 2021 00:41:04 +0000 (UTC) (envelope-from freebsd-hackers@m.gmane-mx.org) Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1lLEoX-0004Ek-Om for freebsd-hackers@freebsd.org; Sun, 14 Mar 2021 01:41:01 +0100 X-Injected-Via-Gmane: http://gmane.org/ To: freebsd-hackers@freebsd.org From: Johannes Totz Subject: Re: Kernel dump during boot Date: Sun, 14 Mar 2021 00:40:56 +0000 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.8.0 In-Reply-To: Content-Language: en-GB X-Rspamd-Queue-Id: 4Dyghc4Cxtz3vsj X-Spamd-Bar: / Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=jo-t.de (policy=none); spf=pass (mx1.freebsd.org: domain of freebsd-hackers@m.gmane-mx.org designates 116.202.254.214 as permitted sender) smtp.mailfrom=freebsd-hackers@m.gmane-mx.org X-Spamd-Result: default: False [0.10 / 15.00]; RCVD_TLS_LAST(0.00)[]; ARC_NA(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; FROM_HAS_DN(0.00)[]; DMARC_POLICY_SOFTFAIL(0.10)[jo-t.de : SPF not aligned (relaxed), No valid DKIM,none]; MV_CASE(0.50)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_GOOD(-0.10)[text/plain]; TO_DN_NONE(0.00)[]; RBL_DBL_DONT_QUERY_IPS(0.00)[116.202.254.214:from]; RCPT_COUNT_ONE(0.00)[1]; SPAMHAUS_ZRD(0.00)[116.202.254.214:from:127.0.2.255]; R_SPF_ALLOW(-0.20)[+mx]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-1.00)[-1.000]; FORGED_SENDER(0.30)[johannes@jo-t.de,freebsd-hackers@m.gmane-mx.org]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:24940, ipnet:116.202.0.0/16, country:DE]; FORGED_MUA_THUNDERBIRD_MSGID_UNKNOWN(2.50)[]; FROM_NEQ_ENVFROM(0.00)[johannes@jo-t.de,freebsd-hackers@m.gmane-mx.org]; MAILMAN_DEST(0.00)[freebsd-hackers] X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Technical discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 14 Mar 2021 00:41:05 -0000 On 14/03/2021 00:01, Eugene Grosbein wrote: > 13.03.2021 23:35, Johannes Totz wrote: > >> Hey everyone, >> >> is there a way to dump the kernel from DDB? > > Try this: > > call doadump > >> I've got a panic during boot, before init is started but after geom and friends are up. So dumpdev hasnt been set yet. >> Can I hardcode it somewhere? Setting kern.shutdown.dumpdevname in loader.conf doesn't seem to work. > > It should work. It worked for me in 11.4. For example: > > dumpdev="/dev/label/swap" > > Later, in multiuser: > > $ sysctl kern.shutdown.dumpdevname > kern.shutdown.dumpdevname: label/swap Ah yes, a simple dumpdev did the trick... (how did I miss that...) Thanks Eugene and Jordan (who replied off-list)!