From owner-freebsd-hackers@freebsd.org Wed Feb 14 10:35:00 2018 Return-Path: Delivered-To: freebsd-hackers@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 34CB9F1504A for ; Wed, 14 Feb 2018 10:35:00 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from kib.kiev.ua (kib.kiev.ua [IPv6:2001:470:d5e7:1::1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id A35536FC60 for ; Wed, 14 Feb 2018 10:34:59 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from tom.home (kib@localhost [127.0.0.1]) by kib.kiev.ua (8.15.2/8.15.2) with ESMTPS id w1EAYqw8015340 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Wed, 14 Feb 2018 12:34:55 +0200 (EET) (envelope-from kostikbel@gmail.com) DKIM-Filter: OpenDKIM Filter v2.10.3 kib.kiev.ua w1EAYqw8015340 Received: (from kostik@localhost) by tom.home (8.15.2/8.15.2/Submit) id w1EAYpta015339; Wed, 14 Feb 2018 12:34:51 +0200 (EET) (envelope-from kostikbel@gmail.com) X-Authentication-Warning: tom.home: kostik set sender to kostikbel@gmail.com using -f Date: Wed, 14 Feb 2018 12:34:51 +0200 From: Konstantin Belousov To: Steven Hartland Cc: freebsd-hackers@freebsd.org Subject: Re: Stale memory during post fork cow pmap update Message-ID: <20180214103451.GF94212@kib.kiev.ua> References: <5A7E7F2B.80900@dell.com> <20180210111848.GL33564@kib.kiev.ua> <5A7F6A7C.80607@dell.com> <20180210225608.GM33564@kib.kiev.ua> <5A82AB7C.6090404@dell.com> <20180213133010.GD94212@kib.kiev.ua> <16f4ce10-70d3-12f4-2246-e8ab44ba511f@multiplay.co.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <16f4ce10-70d3-12f4-2246-e8ab44ba511f@multiplay.co.uk> User-Agent: Mutt/1.9.3 (2018-01-21) X-Spam-Status: No, score=-2.0 required=5.0 tests=ALL_TRUSTED,BAYES_00, DKIM_ADSP_CUSTOM_MED,FREEMAIL_FROM,NML_ADSP_CUSTOM_MED autolearn=no autolearn_force=no version=3.4.1 X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on tom.home X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Feb 2018 10:35:00 -0000 On Wed, Feb 14, 2018 at 09:06:18AM +0000, Steven Hartland wrote: > @kib do you think this issue could be the cause of the golang crashes > during fork that we spoke about a while back > https://github.com/golang/go/issues/15658 > > If its possible is there anything specific I could do to force a regular > occurrence in order to confirm or deny it? I have no idea. It is much easier to check then to try plotting theories about applicability. I will be not surprised by either outcome.