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=-2.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 367E8CA9EB9 for ; Wed, 23 Oct 2019 13:53:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0DAEE21920 for ; Wed, 23 Oct 2019 13:53:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="ktDf1/97" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2406207AbfJWNx0 (ORCPT ); Wed, 23 Oct 2019 09:53:26 -0400 Received: from mail-lj1-f194.google.com ([209.85.208.194]:38368 "EHLO mail-lj1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2405399AbfJWNxZ (ORCPT ); Wed, 23 Oct 2019 09:53:25 -0400 Received: by mail-lj1-f194.google.com with SMTP id q78so6089340lje.5 for ; Wed, 23 Oct 2019 06:53:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=jdtJvmlMpbgOWEw3BLWspvkkg83Xa7YuDRL7rOYib6w=; b=ktDf1/97wyQ7aR+UmyEyC+WKqorEac1hE0xEIahCKqTEEZ05qGTe0dntPWrEcM2A2E ojNo8ayW9sJxfGSO+9g0wtx8Nvvjdq8gCmWvDxpoMpfj5oTobeIf008tMfTHCkcSb/Jk Zoe1O0CPcjAtMEWYP/oyVEwrQxQFh/7vK7M3m7n80opTUNJaJbJwUvxGJV6r7mDDgG1p i5dZr5gBOqmaFOu/FHGPJdyeJ/dKaohPapBceVDW95H6Upc8OoJi3wo3EyM7fhfBpmTo oVaS4Yci8oo7X1Wa0sGYiXw5SRBTTT+VzwnSSstEOzgpfBf3gmy/cVW4KCYp1vyhwStk zs3Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=jdtJvmlMpbgOWEw3BLWspvkkg83Xa7YuDRL7rOYib6w=; b=YXyjCbDVVq+TEKqnFQuuxZwYoX6uIi1wMNy0e9y4m16f54oWL0XQ3TdtgcH7UQ6Uni qWhdfHWmP9DT8X5rlicoKcAQ7efPS6hJgwGMNwazuHY5yvdX6MscM/HfN+5goE9dLrf6 DktXO+loJioGQHCTyJJbWzP72HO/lrl8e8NHCl44pq9Tr20/A7txE4mqvxQI2dk0Yp4f cD12Q5x2hZES1roAEdaMdMKJtr1QdNnPLsXQ3IGAzlGGEFz2S1yod81tcKuK1DTJLT0T rNQiKYJ7PcDOXB9SL9q6bM0E3Qt++EyvNjK83i9EPdeGJb7EUKkJy9eemUSjvQaBk4Ws gnFw== X-Gm-Message-State: APjAAAWLc95xFpL3AG2gIZmMc69lXXaRkbNaSENTZ5S5LjCN/V1IdQFi ZGtrIbDj7Jr7stnpXkv1rOw= X-Google-Smtp-Source: APXvYqwib1R5fkUuWdhYhzQyc6j1+FeMw+t+cnLz/6a5hXkOQbxys6/WQU/TRU0XRuqiP1wR7mgC1g== X-Received: by 2002:a05:651c:106b:: with SMTP id y11mr6524354ljm.123.1571838803522; Wed, 23 Oct 2019 06:53:23 -0700 (PDT) Received: from uranus.localdomain ([5.18.199.94]) by smtp.gmail.com with ESMTPSA id q14sm9550178ljc.7.2019.10.23.06.53.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 23 Oct 2019 06:53:21 -0700 (PDT) Received: by uranus.localdomain (Postfix, from userid 1000) id C14FB4610AC; Wed, 23 Oct 2019 16:53:20 +0300 (MSK) Date: Wed, 23 Oct 2019 16:53:20 +0300 From: Cyrill Gorcunov To: Thomas Gleixner Cc: LKML , Ingo Molnar , Peter Zijlstra , linux-mm@kvack.org, Catalin Marinas Subject: Re: [BUG -tip] kmemleak and stacktrace cause page faul Message-ID: <20191023135320.GJ12121@uranus.lan> References: <20191019114421.GK9698@uranus.lan> <20191022142325.GD12121@uranus.lan> <20191022145619.GE12121@uranus.lan> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.12.1 (2019-06-15) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Oct 23, 2019 at 03:47:57PM +0200, Thomas Gleixner wrote: > > And you are right this happens because cea_exception_stacks is not yet > initialized which makes begin = 0 and therefore point into nirvana. > > So the fix is trivial. Great! Thanks a lot for sych detailed analysis! I'll test the patch.