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=-8.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS 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 A3987C4727F for ; Thu, 1 Oct 2020 11:05:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1A1812137B for ; Thu, 1 Oct 2020 11:05:23 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=alien8.de header.i=@alien8.de header.b="j/AbL0Rw" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731977AbgJALFW (ORCPT ); Thu, 1 Oct 2020 07:05:22 -0400 Received: from mail.skyhub.de ([5.9.137.197]:41896 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731839AbgJALFV (ORCPT ); Thu, 1 Oct 2020 07:05:21 -0400 Received: from zn.tnic (p200300ec2f089d0086f50977b536c1c2.dip0.t-ipconnect.de [IPv6:2003:ec:2f08:9d00:86f5:977:b536:c1c2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.skyhub.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id 5551A1EC04B9; Thu, 1 Oct 2020 13:05:20 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1601550320; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:in-reply-to:in-reply-to: references:references; bh=9c/l0kmClTAlJvD865tYjP10jYTfLqBs8vejfOpvoT4=; b=j/AbL0RwAq2++eRYzmx63l1TDHmKg/0tgsz+0kUUrORBXneDyoXc966/ag2axOHxyLtxVT SGLOrFdgBFy5qcm7oICYTxyahmmDZkwZ5hbu3ivexYbXBXXG8Fn537oJ991Zo6WzKZvj6j b5ebJvBT21yLjw2ICiHL7WxjGNBbkOQ= Date: Thu, 1 Oct 2020 13:05:12 +0200 From: Borislav Petkov To: Dmitry Vyukov Cc: Alexander Potapenko , Marco Elver , syzbot , Arnaldo Carvalho de Melo , Alexander Shishkin , "H. Peter Anvin" , Jiri Olsa , LKML , Mark Rutland , Ingo Molnar , Namhyung Kim , Peter Zijlstra , syzkaller-bugs , Thomas Gleixner , the arch/x86 maintainers , clang-built-linux , syzkaller Subject: Re: general protection fault in perf_misc_flags Message-ID: <20201001110512.GB17683@zn.tnic> References: <20200928085401.GE1685@zn.tnic> <20200928202353.GI1685@zn.tnic> <20200929083336.GA21110@zn.tnic> <20200930161711.GH6810@zn.tnic> <20200930163120.GJ6810@zn.tnic> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Oct 01, 2020 at 12:23:08PM +0200, Dmitry Vyukov wrote: > I've prepared a change that removes rodata=n: > https://github.com/google/syzkaller/pull/2155 Looks good. > I think we will be able to indirectly evaluate if it helps or not over > some period of time based on occurrence of any new similar crashes. Yap, that would be interesting to see whether those corruptions disappear. If they do, you probably should start getting #PFs of writes to RO memory, instead, resulting from those stray writes. We'll see. Thx. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette