From owner-freebsd-emulation@freebsd.org Sun May 10 15:42:20 2020 Return-Path: Delivered-To: freebsd-emulation@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 267A82EADFC; Sun, 10 May 2020 15:42:20 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from hz.grosbein.net (hz.grosbein.net [IPv6:2a01:4f8:c2c:26d8::2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "hz.grosbein.net", Issuer "hz.grosbein.net" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 49KpGf5MfYz4Kqb; Sun, 10 May 2020 15:42:18 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from eg.sd.rdtc.ru (eg.sd.rdtc.ru [IPv6:2a03:3100:c:13:0:0:0:5]) by hz.grosbein.net (8.15.2/8.15.2) with ESMTPS id 04AFfXoV015861 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sun, 10 May 2020 15:41:36 GMT (envelope-from eugen@grosbein.net) X-Envelope-From: eugen@grosbein.net X-Envelope-To: lobo@bsd.com.br Received: from [10.58.0.10] (dadvw [10.58.0.10]) by eg.sd.rdtc.ru (8.15.2/8.15.2) with ESMTPS id 04AFfUDm089302 (version=TLSv1.2 cipher=DHE-RSA-AES128-SHA bits=128 verify=NOT); Sun, 10 May 2020 22:41:30 +0700 (+07) (envelope-from eugen@grosbein.net) Subject: Re: Find specific changes between revisions To: Mario Lobo , hackers@freebsd.org, vbox@freebsd.org, "freebsd-emulation@freebsd.org" References: <614e0ff9-1adc-1634-5711-ca032d6260bf@fastmail.com> From: Eugene Grosbein Message-ID: <91d3b015-3708-eacd-3706-5729e0b96e9e@grosbein.net> Date: Sun, 10 May 2020 22:41:24 +0700 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=0.3 required=5.0 tests=BAYES_00,LOCAL_FROM, SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.2 X-Spam-Report: * -2.3 BAYES_00 BODY: Bayes spam probability is 0 to 1% * [score: 0.0000] * -0.0 SPF_PASS SPF: sender matches SPF record * 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record * 2.6 LOCAL_FROM From my domains X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on hz.grosbein.net X-Rspamd-Queue-Id: 49KpGf5MfYz4Kqb X-Spamd-Bar: --- Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=permerror (mx1.freebsd.org: domain of eugen@grosbein.net uses mechanism not recognized by this client) smtp.mailfrom=eugen@grosbein.net X-Spamd-Result: default: False [-4.00 / 15.00]; ARC_NA(0.00)[]; TO_DN_EQ_ADDR_SOME(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; TO_DN_SOME(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[grosbein.net]; SH_EMAIL_DBL_DONT_QUERY_IPS(0.00)[0.5.128.228,0.5.126.35]; RCVD_COUNT_THREE(0.00)[3]; TO_MATCH_ENVRCPT_SOME(0.00)[]; R_SPF_PERMFAIL(0.00)[]; IP_SCORE(-1.90)[ip: (-5.31), ipnet: 2a01:4f8::/29(-2.66), asn: 24940(-1.50), country: DE(-0.02)]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:24940, ipnet:2a01:4f8::/29, country:DE]; MID_RHS_MATCH_FROM(0.00)[]; RCVD_TLS_ALL(0.00)[]; SH_EMAIL_ZRD(0.00)[0.5.128.228,0.5.126.35] X-Mailman-Approved-At: Sun, 10 May 2020 20:46:14 +0000 X-BeenThere: freebsd-emulation@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: Development of Emulators of other operating systems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 10 May 2020 15:42:20 -0000 10.05.2020 5:52, Mario Lobo wrote: > The command: > > svn diff https://svn.freebsd.org/base/stable/11@359971 > https://svn.freebsd.org/base/stable/11@360676 > > yielded a 170 Mbytes file!! > > It will be like looking for a needle in a haystack, in the dark, with just > a hunch of where the needle was dropped. > > Well ... at least I have the haystack. > > Thanks everyone for the tips! You don't really need to study source code to bisect the problem, just use "svnlite update -rZZZZZ" to move your source tree to the middle point between known working and non-working revisions. Then rebuild and reinstall kernel and world, reboot and re-do the test. If it works, you get new (higher) working revision and if not, you get new (lower) non-working one. Repeat until you have only single revision between working and non-working. This procedure takes time and effort but this is not like looking for a needle in a haystack, much easier.