From owner-svn-src-all@freebsd.org Wed Oct 12 15:30:48 2016 Return-Path: Delivered-To: svn-src-all@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 BEF12C0FCC4; Wed, 12 Oct 2016 15:30:48 +0000 (UTC) (envelope-from avg@FreeBSD.org) Received: from citapm.icyb.net.ua (citapm.icyb.net.ua [212.40.38.140]) by mx1.freebsd.org (Postfix) with ESMTP id B69887A3; Wed, 12 Oct 2016 15:30:47 +0000 (UTC) (envelope-from avg@FreeBSD.org) Received: from porto.starpoint.kiev.ua (porto-e.starpoint.kiev.ua [212.40.38.100]) by citapm.icyb.net.ua (8.8.8p3/ICyb-2.3exp) with ESMTP id SAA01556; Wed, 12 Oct 2016 18:30:45 +0300 (EEST) (envelope-from avg@FreeBSD.org) Received: from localhost ([127.0.0.1]) by porto.starpoint.kiev.ua with esmtp (Exim 4.34 (FreeBSD)) id 1buLUT-000IFW-F2; Wed, 12 Oct 2016 18:30:45 +0300 Subject: Re: svn commit: r306680 - in head/sys: amd64/amd64 amd64/include i386/include x86/include x86/x86 To: Konstantin Belousov References: <201610041701.u94H1OK3061119@repo.freebsd.org> <425655dd-ba13-8944-0f31-b1ad6666d90a@FreeBSD.org> <20161012134550.GX68202@kib.kiev.ua> Cc: src-committers@FreeBSD.org, svn-src-all@FreeBSD.org, svn-src-head@FreeBSD.org From: Andriy Gapon Message-ID: Date: Wed, 12 Oct 2016 18:30:09 +0300 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 MIME-Version: 1.0 In-Reply-To: <20161012134550.GX68202@kib.kiev.ua> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 12 Oct 2016 15:30:48 -0000 On 12/10/2016 16:45, Konstantin Belousov wrote: > On Wed, Oct 12, 2016 at 04:25:00PM +0300, Andriy Gapon wrote: >> On 04/10/2016 20:01, Konstantin Belousov wrote: >>> Author: kib >>> Date: Tue Oct 4 17:01:24 2016 >>> New Revision: 306680 >>> URL: https://svnweb.freebsd.org/changeset/base/306680 >>> >>> Log: >>> Re-apply r306516 (by cem): >>> >>> Reduce the cost of TLB invalidation on x86 by using per-CPU completion flags >>> >>> Reduce contention during TLB invalidation operations by using a per-CPU >>> completion flag, rather than a single atomically-updated variable. >> >> Kostik, >> >> could this commit cause a problem reported in the below links? >> https://bz-attachments.freebsd.org/attachment.cgi?id=175614 >> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213371 > > If I am reading the report right, the problem appears on the > 11.0-RELEASE system. The patch you reference was only applied to HEAD a > week ago and was not merged even to stable/11. Sorry for the noise, then. Somehow I thought that this went into the release branch, but obviously there was too little time for that. > The examination must start with backtracing the thread which owns the > smp_ipi_mtx (shown on the screenshot). It looks like DDB is not in GENERIC in 11.0? Not sure if the reporter would be able to configure a dump device and then save the dump given that the panic happens in the installer. If anyone could provide them with instructions that would be great. -- Andriy Gapon