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=-8.4 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_IN_DEF_DKIM_WL 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 9D7ABC433FF for ; Mon, 12 Aug 2019 16:24:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6C0EA20679 for ; Mon, 12 Aug 2019 16:24:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="CFmKhYzb" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726809AbfHLQYp (ORCPT ); Mon, 12 Aug 2019 12:24:45 -0400 Received: from mail-ot1-f47.google.com ([209.85.210.47]:33821 "EHLO mail-ot1-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726500AbfHLQYp (ORCPT ); Mon, 12 Aug 2019 12:24:45 -0400 Received: by mail-ot1-f47.google.com with SMTP id n5so161080935otk.1 for ; Mon, 12 Aug 2019 09:24:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=EX5SqmQimFHHDLW4N4+79Vwj96/2MHoKe+E0fsyJiX4=; b=CFmKhYzbI6hIG26EYtPFKdHkeYvVR2LPoEEm1pWnytsnlQjp8uMPlRXJMT4XFPG7Nv rgb5569VHjTgVD1Fw2h6+J4/BQgIJJ4Y7y5gNs0SBffw7jpP8QVBO4M/HIbQjpAaa+rb oeRnCHlfwZ0DeWobS/2ZmZR0i6iz7uX31WObeAY4TSlcqlDDnOPLMsGDlAAxSd9VdIK6 mFP6LdlZaGVqB0J1BDRvCpZRlaQbzkDD5nWY3rBN+kBy3eWG6JvzxH2370ZZk4mRkTwa bFw004BCG9Ozzkcbd3Kdl3I+0dHSs/liYIYyDatgTOqrNIsd/cRof1FjCqwLGnq2ePe9 kTyQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=EX5SqmQimFHHDLW4N4+79Vwj96/2MHoKe+E0fsyJiX4=; b=kWW+sSzDSwLPKUUb21kMV46LFAQfl/CQ6U51wnrs3lPTlUuxLs/RgHGKQeDCkw3QpH EMGxKEJ+01K6Ry7x7gLSlkR8VGvsQkHCQQ8TDy/Zkw38Y44UsD+1ossDmg2pJyedLK4d A1gniHEsFdrgl+sMmwzUnW4oepaJzTk9tFsU+eB6wN2PlvlfSCJ/gebCAHQ9L1oeCCmy DWhwx0aKcR7avdy7zEfHyzdtjmqKW3ugnHuRzQ3DLT7KtXToG889WNkJFV6fQiZBb13E SJIFEeOSpKaILo8m7ONHB+Wh8FPeIcn89APVgig3taQBW1wG/wBZsQZp7VSNFHW80Xib Wrig== X-Gm-Message-State: APjAAAULpe/udrETInoZbHTECUbjVmOVu/P/dEDYnqodSELsVeTdLUFW /Ypgp3EjXvudi1g3Bbja7EWd4TE6VYgfHfL2Ouv9VA== X-Google-Smtp-Source: APXvYqxmA37cnUt7FIlqtFhijw1GGQINjQ3ttgIzYfaSdF7wC+dpqlZzx5JzYkaAhf5q5G+YBVHWpBw7Op+QeBoNKA4= X-Received: by 2002:a02:ba91:: with SMTP id g17mr12832603jao.11.1565627084182; Mon, 12 Aug 2019 09:24:44 -0700 (PDT) MIME-Version: 1.0 References: <4b54ff1e-f18b-3c58-7caa-945a0775c24c@molgen.mpg.de> <01c7bc6b-dc6d-5eca-401a-8869e02f7c2a@molgen.mpg.de> <20190811094630.GA18925@eldamar.local> <20190811153326.GA8036@eldamar.local> <20190812112853.53ecc122@gandalf.local.home> In-Reply-To: <20190812112853.53ecc122@gandalf.local.home> From: Matthew Garrett Date: Mon, 12 Aug 2019 09:24:30 -0700 Message-ID: Subject: Re: [Linux 5.2.x] /sys/kernel/debug/tracing/events/power/cpu_idle/id: BUG: kernel NULL pointer dereference, address: 0000000000000000 To: Steven Rostedt Cc: Salvatore Bonaccorso , Thomas Gleixner , Paul Menzel , Jacob Pan , Len Brown , x86@kernel.org, LKML , linux-pm@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org On Mon, Aug 12, 2019 at 8:29 AM Steven Rostedt wrote: > From what I understand, Matthew's "lockdown" work is to prevent the > system from doing anything to see what is happening in the kernel. This > includes tracefs. This looks like it is working as designed. Oopsing the kernel isn't working as designed. Ben has a patch to fix this.