From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-f69.google.com (mail-pg0-f69.google.com [74.125.83.69]) by kanga.kvack.org (Postfix) with ESMTP id 4541F6B04A8 for ; Wed, 3 Jan 2018 19:37:56 -0500 (EST) Received: by mail-pg0-f69.google.com with SMTP id z24so54860pgu.20 for ; Wed, 03 Jan 2018 16:37:56 -0800 (PST) Received: from mail-sor-f41.google.com (mail-sor-f41.google.com. [209.85.220.41]) by mx.google.com with SMTPS id g34sor647537pld.69.2018.01.03.16.37.55 for (Google Transport Security); Wed, 03 Jan 2018 16:37:55 -0800 (PST) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (1.0) Subject: Re: "bad pmd" errors + oops with KPTI on 4.14.11 after loading X.509 certs From: Andy Lutomirski In-Reply-To: <20180104003303.GA1654@trogon.sfo.coreos.systems> Date: Wed, 3 Jan 2018 16:37:53 -0800 Content-Transfer-Encoding: quoted-printable Message-Id: References: <20180103084600.GA31648@trogon.sfo.coreos.systems> <20180103092016.GA23772@kroah.com> <20180104003303.GA1654@trogon.sfo.coreos.systems> Sender: owner-linux-mm@kvack.org List-ID: To: Benjamin Gilbert Cc: Greg Kroah-Hartman , x86@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, stable@vger.kernel.org, Thomas Gleixner , Ingo Molnar , Andy Lutomirski , Dave Hansen , Peter Zijlstra > On Jan 3, 2018, at 4:33 PM, Benjamin Gilbert = wrote: >=20 >> On Wed, Jan 03, 2018 at 10:20:16AM +0100, Greg Kroah-Hartman wrote: >> Ick, not good, any chance you can test 4.15-rc6 to verify that the issue >> is also there (or not)? >=20 > I haven't been able to reproduce this on 4.15-rc6. Ah. Maybe try rebuilding a bad kernel with free_ldt_pgtables() modified to d= o nothing, and the read /sys/kernel/debug/page_tables/current (or current_ke= rnel, or whatever it's called). The problem may be obvious. >=20 > --Benjamin Gilbert -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org