From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 81EC8C433F4 for ; Fri, 31 Aug 2018 07:10:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2820520842 for ; Fri, 31 Aug 2018 07:10:59 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2820520842 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux.ee Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727340AbeHaLQ6 (ORCPT ); Fri, 31 Aug 2018 07:16:58 -0400 Received: from smtp2.it.da.ut.ee ([193.40.5.67]:40696 "EHLO smtp2.it.da.ut.ee" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727177AbeHaLQ6 (ORCPT ); Fri, 31 Aug 2018 07:16:58 -0400 Received: from math.ut.ee (unknown [IPv6:2001:bb8:2002:2400:5054:ff:fe3b:8db9]) by smtp2.it.da.ut.ee (Postfix) with ESMTP id 705E2902FF; Fri, 31 Aug 2018 10:10:54 +0300 (EEST) Received: by math.ut.ee (Postfix, from userid 1014) id 5F812220A38; Fri, 31 Aug 2018 10:10:52 +0300 (EEST) Received: from localhost (localhost [127.0.0.1]) by math.ut.ee (Postfix) with ESMTP id 729E422043A; Fri, 31 Aug 2018 10:10:52 +0300 (EEST) Date: Fri, 31 Aug 2018 10:10:52 +0300 (EEST) From: Meelis Roos To: Joerg Roedel cc: Linux Kernel list , linux-mm@kvack.org, Thomas Gleixner Subject: Re: 32-bit PTI with THP = userspace corruption In-Reply-To: <20180830205527.dmemjwxfbwvkdzk2@suse.de> Message-ID: References: <20180830205527.dmemjwxfbwvkdzk2@suse.de> User-Agent: Alpine 2.21 (LRH 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > > I am seeing userland corruption and application crashes on multiple > > 32-bit machines with 4.19-rc1+git. The machines vary: PII, PIII, P4. > > They are all Intel. AMD Duron/Athlon/AthlonMP have been fine in my tests > > so far (may be configuration dependent). > > Thanks for the report! I'll try to reproduce the problem tomorrow and > investigate it. Can you please check if any of the kernel configurations > that show the bug has CONFIG_X86_PAE set? If not, can you please test > if enabling this option still triggers the problem? PAE was not visible itself, but when I changed HIGHMEM_4G to HIGHMEM_64G, X86_PAE was also selected and the resutling kernel works. Also, I verified that the olid proliants with 6G RAM already have HIGHMEM_64G set and they do not exhibit the problem either. -- Meelis Roos (mroos@linux.ee)