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=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,HTML_MESSAGE,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS 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 9BF4FCA9EAF for ; Mon, 21 Oct 2019 10:22:27 +0000 (UTC) Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.kernel.org (Postfix) with SMTP id E36C12084C for ; Mon, 21 Oct 2019 10:22:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="X3tDozxU" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E36C12084C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kernel-hardening-return-17077-kernel-hardening=archiver.kernel.org@lists.openwall.com Received: (qmail 17572 invoked by uid 550); 21 Oct 2019 10:22:20 -0000 Mailing-List: contact kernel-hardening-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Received: (qmail 17536 invoked from network); 21 Oct 2019 10:22:19 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=6xiAvDrnQ8e4TWZ4wtLKKrmaQ/Ia4CwZwFpjoEe4UQ8=; b=X3tDozxU+c+ARu2/sV9/ob1xVrQOXPDtKLMC+QE/uJM7h0/mKF4PO7XajZ2jdE+c05 dzfV1+uLP/5vhTPvA2NNOTFO1TJwcibTEmNo7yQu7bz4U3S6H328YddrN2LJGGRxrkbN gSs40lciNiuPf3ilzQcKpAgZRW9tLODFswmSEf5SQo1zwGs6xU4BXg+PnlLTcr5NrQyV 9yGJ3FwyO8lyevtf1Ufxd9m5GXMskpOthLLzDIJbOpIbJ9p+fECsN6s1JWzurYkAMxHR Ls/LX4o+ZInAMb74bcwqGWqTNMYTH0TWzbXlKJdJbXk1qc+/AAdeNIIC21YQfpFx/UEJ Zysw== 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=6xiAvDrnQ8e4TWZ4wtLKKrmaQ/Ia4CwZwFpjoEe4UQ8=; b=f69BRYuCcZCboVPpGFefTWYbHadT+u88sUDy57Pe/P2qOIgLVQrvJD0o0fB2qS0nYp MAo+Hkh21zJU3MduQRIp/ypZ50svF7gBcEdikJSxzJGzk5fErpqMyTbeXQWP3nZ45zOe 42lB1TmqeyAKiikf4PIz8gfju9QcyKCYejMPi82T4DhQmIVTmSYnhYeOeJRfMRTX2qpt F+FMHh3pHqoums4xstA3fwmOwIwiShac+kOXL2OAyaugUoq/lhuEf4hfTI/wieHTheTt yH5zviG7CgGhZYCDNvXou4M3MolN4cnQ7QKjQovcB2aUCLugSRVTwuA0b/7nCZVn6Hts qd8Q== X-Gm-Message-State: APjAAAXxM7eP9+oLvFEQUE4YrNVMvGhzn+rG3SdccTNLcD/nD6Hl1qEn +nt1C5OeoETx/BTIrTiUIcurEkVfVMyFxKvOz5U= X-Google-Smtp-Source: APXvYqxar7eiW0LM5LvhCA63H9av+KqG9mcipqZ5MU8KxCvxJ2vHAINjBYfGTsCfPfC6R2EwS801PmdpTUYQO8wHNgA= X-Received: by 2002:a92:8749:: with SMTP id d9mr10892308ilm.94.1571653327743; Mon, 21 Oct 2019 03:22:07 -0700 (PDT) MIME-Version: 1.0 References: <2e2a3d3c-872e-3d07-5585-92734a532ef2@gmail.com> In-Reply-To: From: youling 257 Date: Mon, 21 Oct 2019 18:22:02 +0800 Message-ID: Subject: Re: How to get the crash dump if system hangs? To: Lukas Odzioba Cc: keescook@chromium.org, kernel-hardening@lists.openwall.com, munisekharrms@gmail.com Content-Type: multipart/alternative; boundary="0000000000004f72750595690e54" --0000000000004f72750595690e54 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable When add cmdline memmap=3D1M!2047M, the iomem will be 7ef00001-7fefffff : R= AM buffer 7ff00000-7fffffff : Persistent Memory (legacy) 7ff00000-7ff00fff : MSFT0101:00, so ramoops.mem_address=3D0x7ff00000. Lukas Odzioba =E4=BA=8E 2019=E5=B9=B410=E6=9C=882= 1=E6=97=A5=E5=91=A8=E4=B8=80 =E4=B8=8B=E5=8D=884:39=E5=86=99=E9=81=93=EF=BC= =9A > youling257 wrote: > > > > I don't know my ramoops.mem_address, please help me. > > > > what is ramoops.mem_address? > > It is a Linux kernel parameter, see documentation below: > https://www.kernel.org/doc/Documentation/admin-guide/ramoops.rst > > It requires memory which can hold data between reboots, so i'm not > sure how it will suit your case. > > Thanks, > Lukas > --0000000000004f72750595690e54 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
When add cmdline memmap=3D1M!2047M, the iomem will b= e 7ef00001-7fefffff : RAM buffer 7ff00000-7fffffff : Persistent Memory (leg= acy) 7ff00000-7ff00fff : MSFT0101:00,
so ramoops.mem= _address=3D0x7ff00000.

Lukas Odzioba <lukas.odzioba@gmail.com> =E4= =BA=8E 2019=E5=B9=B410=E6=9C=8821=E6=97=A5=E5=91=A8=E4=B8=80 =E4=B8=8B=E5= =8D=884:39=E5=86=99=E9=81=93=EF=BC=9A
youling257 <youling257@gmail.com> wrote:
>
> I don't know my ramoops.mem_address, please help me.
>
> what is ramoops.mem_address?

It is a Linux kernel parameter, see documentation below:
https://www.kernel.org/do= c/Documentation/admin-guide/ramoops.rst

It requires memory which can hold data between reboots, so i'm not
sure how it will suit your case.

Thanks,
Lukas
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