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_PASS,USER_AGENT_MUTT autolearn=ham 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 2D779C6778F for ; Wed, 25 Jul 2018 04:08:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D748A20852 for ; Wed, 25 Jul 2018 04:08:06 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="qK1z1d6i" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D748A20852 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728126AbeGYFRt (ORCPT ); Wed, 25 Jul 2018 01:17:49 -0400 Received: from mail-pg1-f170.google.com ([209.85.215.170]:38800 "EHLO mail-pg1-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727012AbeGYFRt (ORCPT ); Wed, 25 Jul 2018 01:17:49 -0400 Received: by mail-pg1-f170.google.com with SMTP id k3-v6so4350638pgq.5 for ; Tue, 24 Jul 2018 21:08:04 -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=m+8DjOv/eZ7vSrNIzumwemN3JheG531Da1XZklPrXKI=; b=qK1z1d6ijdPO2gqgN8YMWtocsx0/aJdMeUUaLU14vC5EskQ2jbBPPt6mnwS3Ah4Sxf 4BlXsSp/Igdpz+WSkH3jdgdZvlwuGAJNMOK7Lgj8XwQRDEH3yOeka9IpzZ50NST8bru8 LWZxksudUnCE9TSFveYPOmMTRYqNf4EcbHjZlzgHmDwLUy9YIYlT+Ja9OQsKCA1Gljn4 a8EJeG743pZaURiqdm4tSUWhG12lI0RWJc2BURlu3OU89DQzvTV46A3zwJCjfEkYLMLI uyD8Or0ugnd3/LLTCOZFIhH83J316JsAPuOswehx13x4r5WLanT6yuLzRdDc5CMy/JKu 0N3g== 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=m+8DjOv/eZ7vSrNIzumwemN3JheG531Da1XZklPrXKI=; b=BPL9fek54gR1eInz2BX6D6dsA4n2wBY4tr1RhNl2R3eWXtBbzznEJ/othN7GmH92qO LVyrGLwwIH2BgNFOxmOhTksDFDGmHDvsUd4iS/6zN1uS8JG/DvnzGuiELdgdugdkLb71 YNOuw71QLdsSLRGPBJMTsohcSB+SJExWTIe2ApBAXEU6XN3X0pOSde4+DvUlCA7Z2SNB ijXEE3uSHP1fG3rAafK4OOR9V4lRxcozHOyfL45qjd7U5SKVF3qtgOA6szH6oR+vTD0D 3mjXjdUVrqPPC8dW9z5pDJssQ2ovSgWNPLgXefgPQW9JmXJwhYEfwnrYKZDAfbda2eOL YlzQ== X-Gm-Message-State: AOUpUlFAgbOMSFwIsjHTZTddxwhnHXamV3FpQLBtev3bUfwdAaFrcETG yUHhGhgYU6BUbNtjcICQZ3w= X-Google-Smtp-Source: AAOMgpc8IrMv127Ckg4o4EuE802Q1M0vXbvTa3MP0ukoJUGwM1MSvNHW/D44mXVDdK761TncjLRFKQ== X-Received: by 2002:a62:5cc1:: with SMTP id q184-v6mr20487722pfb.241.1532491684022; Tue, 24 Jul 2018 21:08:04 -0700 (PDT) Received: from localhost ([39.7.58.253]) by smtp.gmail.com with ESMTPSA id a15-v6sm21087999pfe.32.2018.07.24.21.08.01 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 24 Jul 2018 21:08:02 -0700 (PDT) Date: Wed, 25 Jul 2018 13:07:58 +0900 From: Sergey Senozhatsky To: Matthew Wilcox Cc: Minchan Kim , Tino Lehnig , ngupta@vflare.org, linux-kernel@vger.kernel.org, Sergey Senozhatsky , Andrew Morton Subject: Re: Zram writeback feature unstable with heavy swap utilization - BUG: Bad page state in process... Message-ID: <20180725040758.GA616@jagdpanzerIV> References: <0516ae2d-b0fd-92c5-aa92-112ba7bd32fc@contabo.de> <20180724010342.GA195675@rodete-desktop-imager.corp.google.com> <20180725013250.GA66792@rodete-desktop-imager.corp.google.com> <20180725025124.GC16271@bombadil.infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180725025124.GC16271@bombadil.infradead.org> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On (07/24/18 19:51), Matthew Wilcox wrote: > > Also note that this is in the allocation path; this flag isn't checked > at free. But it is cleared on free, so someone's stomping on page->flags > after they're freed. I suggest enabling more debugging code. Would be lovely if Tino could bisect it, perhaps. -ss