From owner-freebsd-current@FreeBSD.ORG Fri Nov 13 13:56:09 2009 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 7B84A106566C; Fri, 13 Nov 2009 13:56:09 +0000 (UTC) (envelope-from avg@icyb.net.ua) Received: from citadel.icyb.net.ua (citadel.icyb.net.ua [212.40.38.140]) by mx1.freebsd.org (Postfix) with ESMTP id 888D08FC17; Fri, 13 Nov 2009 13:56:08 +0000 (UTC) Received: from odyssey.starpoint.kiev.ua (alpha-e.starpoint.kiev.ua [212.40.38.101]) by citadel.icyb.net.ua (8.8.8p3/ICyb-2.3exp) with ESMTP id PAA00171; Fri, 13 Nov 2009 15:55:43 +0200 (EET) (envelope-from avg@icyb.net.ua) Message-ID: <4AFD655E.5020801@icyb.net.ua> Date: Fri, 13 Nov 2009 15:55:42 +0200 From: Andriy Gapon User-Agent: Thunderbird 2.0.0.23 (X11/20090825) MIME-Version: 1.0 To: Kai Gallasch References: <1031257439203@webmail57.yandex.ru> <941257966918@webmail42.yandex.ru> <200911111504.14906.jhb@freebsd.org> <20091112195932.5875387e@orwell.free.de> <4AFD140D.7010407@icyb.net.ua> <20091113144804.2c0fb90f@orwell.free.de> In-Reply-To: <20091113144804.2c0fb90f@orwell.free.de> X-Enigmail-Version: 0.95.7 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: freebsd-current@freebsd.org Subject: Re: 8.0RC2 amd64 - kernel panic running make buildworld X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 13 Nov 2009 13:56:09 -0000 on 13/11/2009 15:48 Kai Gallasch said the following: > Am Fri, 13 Nov 2009 10:08:45 +0200 > schrieb Andriy Gapon : >> Kai, >> I have a hunch, could you please try the following _sledgehammer_ >> patch (only kernel build/install is needed): >> diff --git a/sys/amd64/amd64/pmap.c b/sys/amd64/amd64/pmap.c >> index 44b71f3..a456609 100644 >> --- a/sys/amd64/amd64/pmap.c >> +++ b/sys/amd64/amd64/pmap.c >> @@ -2981,6 +2981,7 @@ setpte: >> * Map the superpage. >> */ >> pde_store(pde, PG_PS | newpde); >> + pmap_invalidate_all(pmap); >> >> pmap_pde_promotions++; >> CTR2(KTR_PMAP, "pmap_promote_pde: success for va %#lx" >> >> This will slow down an act of promotion to a superpage, but should >> not have any visible impact on overall performance. > > Andriy, > > I tried the patch with vm.pmap.pg_ps_enabled="1" , hw.mca.enabled="1" > , rebuilt the kernel (although normally I never build kernels on Friday > 13th :-) and ran buildworld -j8 for five times in a row. No sign of a > machine check exception, no reboot. I think that this is good news. This is not a fix, but the fact that it helps should help us find a proper solution. Thanks! -- Andriy Gapon