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=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no 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 61AEDC4338F for ; Thu, 29 Jul 2021 16:54:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 447DF60560 for ; Thu, 29 Jul 2021 16:54:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230003AbhG2Qya (ORCPT ); Thu, 29 Jul 2021 12:54:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41126 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229556AbhG2Qy3 (ORCPT ); Thu, 29 Jul 2021 12:54:29 -0400 Received: from mail-qt1-x833.google.com (mail-qt1-x833.google.com [IPv6:2607:f8b0:4864:20::833]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EA09FC061765 for ; Thu, 29 Jul 2021 09:54:25 -0700 (PDT) Received: by mail-qt1-x833.google.com with SMTP id t18so4394580qta.8 for ; Thu, 29 Jul 2021 09:54:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=maine.edu; s=google; h=from:date:to:cc:subject:in-reply-to:message-id:references :mime-version; bh=nmN1n5c1F6qwmwJaeBZljnOrsuqT02jPRsNhxHzER/k=; b=OUc06M1kLDpQh7HYTyweSKDppRcsKgkEiR/4gibkr/2si/o5OT21QYcc7cLS8IYfC2 FUGaJPTj9BM3KeUMZURQwEwCEQ/vWc7/U6SddB6tmwszhcwu4RrkEUbQMrp0lvqSt15Q CrMKtLHrZ0bK8+pt1Oywbeh+3EFpKwskmDf5E= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:date:to:cc:subject:in-reply-to:message-id :references:mime-version; bh=nmN1n5c1F6qwmwJaeBZljnOrsuqT02jPRsNhxHzER/k=; b=UqaU0/t/6HaJbqZaM/eNRtXr2G6fybJXJKQ8xx9MS49acV12EnISEBP1FghDmr1dpu 5sbgg+dvFdIuvSO/kSBDMNvgz1hS5voybSTu1Qj9RCrIYkhP4vWZCiMTMJ6mK71k3qZF P4uaphl+HuSw6zaalCM3S15BE5z1hlqmb7yJQ7hd22cRU2xmm8mROTlnWC7Tx6iIHJBo KJuZMNHyq1hI8gdOIbg8FNXcslL2UM6o3SYaemut9Rv9x+ddyy29FDvnpzsHnr9YFlqf LL3JdH9FBXv8iId4J1ky6rlweKxN3LsfnXifqAxXqVhlJCAmiSpFc85Hktxggph9UO7O 0PPw== X-Gm-Message-State: AOAM533viGgVWtJmTwh8DaGyM6em9vTiBMs7yK/YhotlgXN/IsKPULer s6g7aqVzHp+kz+WGaDHZyNTP2A== X-Google-Smtp-Source: ABdhPJxnkbLYjngXhmgJYao+E+ih1NHKJS9IHWWGFhCRJ2BcE78eWyXBsRyr855cr++z8NEsHsIYqQ== X-Received: by 2002:a05:622a:4c8:: with SMTP id q8mr5023610qtx.187.1627577665084; Thu, 29 Jul 2021 09:54:25 -0700 (PDT) Received: from macbook-air.local (weaver.eece.maine.edu. [130.111.218.23]) by smtp.gmail.com with ESMTPSA id e16sm1484797qtq.35.2021.07.29.09.54.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Jul 2021 09:54:24 -0700 (PDT) From: Vince Weaver X-Google-Original-From: Vince Weaver Date: Thu, 29 Jul 2021 12:54:20 -0400 (EDT) To: Peter Zijlstra cc: Vince Weaver , linux-kernel@vger.kernel.org, Ingo Molnar , Arnaldo Carvalho de Melo , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , "Liang, Kan" Subject: Re: [perf] fuzzer triggers unchecked MSR access error: WRMSR to 0x318 In-Reply-To: Message-ID: <88ad522-7cd5-f636-7c1f-a5ae22a76e5f@maine.edu> References: <37881148-a43e-5fd4-817c-a875adc7a15f@maine.edu> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 29 Jul 2021, Peter Zijlstra wrote: > On Wed, Jul 28, 2021 at 12:49:43PM -0400, Vince Weaver wrote: > > [32694.087403] unchecked MSR access error: WRMSR to 0x318 (tried to write 0x0000000000000000) at rIP: 0xffffffff8106f854 (native_write_msr+0x4/0x20) > > [32694.101374] Call Trace: > > [32694.103974] perf_clear_dirty_counters+0x86/0x100 > > Hmm.. if I read this right that's MSR_ARCH_PERFMON_FIXED_CTR0 + i, given > that FIXED_CTR0 is 0x309 that gives i == 15, which is FIXED_BTS. > > I'm thinking something like this ought to cure things. I know it sounds like the complete fix is a bit different from this, but I did want to report that the patch does fix the issue on my machine. Vince Weaver vincent.weaver@maine.edu