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=-2.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,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 B2094C07E9C for ; Wed, 14 Jul 2021 14:30:37 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 3F62961260 for ; Wed, 14 Jul 2021 14:30:37 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3F62961260 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 66EE36B0083; Wed, 14 Jul 2021 10:30:37 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 6461E6B0085; Wed, 14 Jul 2021 10:30:37 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 50EA86B0088; Wed, 14 Jul 2021 10:30:37 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0007.hostedemail.com [216.40.44.7]) by kanga.kvack.org (Postfix) with ESMTP id 303676B0083 for ; Wed, 14 Jul 2021 10:30:37 -0400 (EDT) Received: from smtpin13.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 1BA9B824C42E for ; Wed, 14 Jul 2021 14:30:36 +0000 (UTC) X-FDA: 78361429272.13.396D039 Received: from mail-ed1-f50.google.com (mail-ed1-f50.google.com [209.85.208.50]) by imf28.hostedemail.com (Postfix) with ESMTP id AB1D390000AD for ; Wed, 14 Jul 2021 14:30:35 +0000 (UTC) Received: by mail-ed1-f50.google.com with SMTP id k27so3368489edk.9 for ; Wed, 14 Jul 2021 07:30:35 -0700 (PDT) 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=nRGgwBFXIqj/fEVN9u7u5Lf4JMXSz/tXuESwz3X7tks=; b=RhPLCmPjgh4iItNwpJlwgpSmxqK61jCaySJVqobzMAnqnCGm7G4K8goipvYDzr2aNu 93CHMW47jdG5H/l8tajoMmrHPNg/IPa4u1wmks1FThzoYGpgqRA9giTgWFoSAGYiqSrm szzf8ibiI8h858TxNH5gMKPhSVwXnhaMBKuojdePpmB3b0ibRCts4dFD7W8uB4i2dNgH VawrajRYfQaizMhJTFQeiu4UX4XzJcDO4Mzygdx22e7YDN1oT5drWKAve5Dy0qnp5gYf 6Ukx9Xdo93yFb1nTB5PwxodY2zMkZ0+ZAJBVg1RT13QadOgaB1fnXQ7MKoMfxbWKOWot O/Ww== 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=nRGgwBFXIqj/fEVN9u7u5Lf4JMXSz/tXuESwz3X7tks=; b=fUa5lurA8P7XzjiI1u7H38VDjZf2QgU9Cl7IwNPsHofn8Koon2arAmgCygR/vgsC2A XPms2GANJxJ71wd6rrNDWE56C46giDeYD39IPXCdvUGTjKRD9VTiXH+282ZdNxaW8/Rr GNPSGgwlc+yE9WsDD6rBnfoHdhsX2Xpg/mPIMxZAmAnN36hFFMI9c+NatNSmIbH/37BL DNw+EPnessbJNo+3+pRteJ7lRM+JvfdL3BVbJfD7IrEXf5+p6PCiiOvacwRh/2vyJ5oh anA4d2EkMFoD6i4V6YPTqDCfrdAMcy4j57OjDQsuuBdf0JWkdLjDAe3jPzx5RbHvECM3 K+RA== X-Gm-Message-State: AOAM533m46W59uGdM1CbXbJKv8Pz23xtAmgYzc8z3EDIMAwpVbeAFlNU UlGHS8lUOwIKOQg+u5QVDBJ+dlBwNLk1IRURRcA= X-Google-Smtp-Source: ABdhPJyCOOjOLOAnVSSiY6Vl51bGzpgh8I5liY+x7Nw0jjUYSHPcBYU1ZE1+yv3F+5E1HazJNuD8iMiuQ5nl+1pzCPI= X-Received: by 2002:a05:6402:10c7:: with SMTP id p7mr14256008edu.159.1626273034290; Wed, 14 Jul 2021 07:30:34 -0700 (PDT) MIME-Version: 1.0 References: <7074179d.c3fd.17aa3f148cc.Coremail.wuzhouhui14@mails.ucas.ac.cn> In-Reply-To: <7074179d.c3fd.17aa3f148cc.Coremail.wuzhouhui14@mails.ucas.ac.cn> From: yong w Date: Wed, 14 Jul 2021 22:30:22 +0800 Message-ID: Subject: Re: Re: [BUG] ramfs system panic when using dd to create files To: wuzhouhui Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, akpm@linux-foundation.org, nico@fluxnic.net, wang.yong12@zte.com.cn Content-Type: text/plain; charset="UTF-8" Authentication-Results: imf28.hostedemail.com; dkim=pass header.d=gmail.com header.s=20161025 header.b=RhPLCmPj; spf=pass (imf28.hostedemail.com: domain of yongwpur@gmail.com designates 209.85.208.50 as permitted sender) smtp.mailfrom=yongwpur@gmail.com; dmarc=pass (policy=none) header.from=gmail.com X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: AB1D390000AD X-Stat-Signature: 3smxq6z3z3is3dtfim3mm93rtkwmt6dk X-HE-Tag: 1626273035-93484 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000001, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Thanks for your reply! > Limit max size of ramfs. It's no use using size to limit the size of ramfs. "mount -t ramfs -o size=10M ramfs /ramfs" is the command i use. > > The comments already explains why kernel should panic on this situation: > /* > * If we got here due to an actual allocation at the > * system level, we cannot survive this and will enter > * an endless loop in the allocator. Bail out now. > */ But it causes panic, actually , I don't want it panics