From owner-freebsd-stable@freebsd.org Thu Nov 29 04:33:13 2018 Return-Path: Delivered-To: freebsd-stable@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 ED183114E4D1 for ; Thu, 29 Nov 2018 04:33:12 +0000 (UTC) (envelope-from wollman@hergotha.csail.mit.edu) Received: from hergotha.csail.mit.edu (tunnel82308-pt.tunnel.tserv4.nyc4.ipv6.he.net [IPv6:2001:470:1f06:ccb::2]) (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 C99747266F; Thu, 29 Nov 2018 04:33:09 +0000 (UTC) (envelope-from wollman@hergotha.csail.mit.edu) Received: from hergotha.csail.mit.edu (localhost [127.0.0.1]) by hergotha.csail.mit.edu (8.15.2/8.15.2) with ESMTP id wAT4X6Md006278; Wed, 28 Nov 2018 23:33:07 -0500 (EST) (envelope-from wollman@hergotha.csail.mit.edu) Received: (from wollman@localhost) by hergotha.csail.mit.edu (8.15.2/8.14.4/Submit) id wAT4X6Fq006277; Wed, 28 Nov 2018 23:33:06 -0500 (EST) (envelope-from wollman) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <23551.27650.73879.929594@hergotha.csail.mit.edu> Date: Wed, 28 Nov 2018 23:33:06 -0500 From: Garrett Wollman To: Mark Johnston Cc: Konstantin Belousov , freebsd-stable@freebsd.org Subject: Re: Trap 12 in vm_page_alloc_after() In-Reply-To: <20181129001904.GA63393@raichu> References: <23538.4310.710700.401331@hergotha.csail.mit.edu> <20181119050944.GW2378@kib.kiev.ua> <23547.30738.149260.454185@hergotha.csail.mit.edu> <20181129001904.GA63393@raichu> X-Mailer: VM 8.2.0b under 26.1 (amd64-portbld-freebsd11.2) X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.6.2 (hergotha.csail.mit.edu [127.0.0.1]); Wed, 28 Nov 2018 23:33:07 -0500 (EST) X-Spam-Status: No, score=-1.0 required=5.0 tests=ALL_TRUSTED, HEADER_FROM_DIFFERENT_DOMAINS autolearn=disabled version=3.4.1 X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on hergotha.csail.mit.edu X-Rspamd-Queue-Id: C99747266F X-Spamd-Result: default: False [-4.27 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; DMARC_POLICY_SOFTFAIL(0.10)[bimajority.org : No valid SPF, No valid DKIM,none]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; TO_DN_SOME(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[text/plain]; IP_SCORE(-1.62)[ipnet: 2001:470::/32(-4.50), asn: 6939(-3.49), country: US(-0.09)]; RCVD_COUNT_THREE(0.00)[3]; TO_MATCH_ENVRCPT_SOME(0.00)[]; R_SPF_PERMFAIL(0.00)[]; MX_GOOD(-0.01)[hergotha.bimajority.org]; NEURAL_HAM_SHORT(-0.94)[-0.941,0]; FORGED_SENDER(0.30)[wollman@bimajority.org,wollman@hergotha.csail.mit.edu]; R_DKIM_NA(0.00)[]; RCVD_TLS_LAST(0.00)[]; ASN(0.00)[asn:6939, ipnet:2001:470::/32, country:US]; FROM_NEQ_ENVFROM(0.00)[wollman@bimajority.org,wollman@hergotha.csail.mit.edu]; FREEMAIL_CC(0.00)[gmail.com] X-Rspamd-Server: mx1.freebsd.org X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Nov 2018 04:33:13 -0000 < said: > If you're using a Skylake, I suspect that you can set the > hw.skz63_enable tunable to 0 as a workaround, assuming you're not using > any code that relies on Intel TSX. (I don't think there's anything in > the base system that does.) There are some details in > https://reviews.freebsd.org/D18374 It is definitely a Skylake (although it took searching to find that out, since we don't identify processors by Intel codename). I've set that tunable, but I won't know whether it helps until the next (scheduled or unscheduled) reboot. -GAWollman