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=-16.4 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_IN_DEF_DKIM_WL autolearn=unavailable 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 5540FC388F9 for ; Wed, 11 Nov 2020 13:52:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E33E72072C for ; Wed, 11 Nov 2020 13:52:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="ruYOIkEm" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727087AbgKKNwS (ORCPT ); Wed, 11 Nov 2020 08:52:18 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56830 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726983AbgKKNwR (ORCPT ); Wed, 11 Nov 2020 08:52:17 -0500 Received: from mail-qk1-x743.google.com (mail-qk1-x743.google.com [IPv6:2607:f8b0:4864:20::743]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 928C7C0613D6 for ; Wed, 11 Nov 2020 05:52:17 -0800 (PST) Received: by mail-qk1-x743.google.com with SMTP id n132so1680592qke.1 for ; Wed, 11 Nov 2020 05:52:17 -0800 (PST) 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=m80oT1JfZEh7w9pLk5CWjzhWzy3pvKhfVuBt46eLCBw=; b=ruYOIkEm/5N7tXFU9wnoobpSSwg6ScTTQcUGJl4xQvztJCtpHPICTHlzj52Ws0uUn0 DC39qewbtysvAam0v/xotz7/Fo/BfTQtsNPVxofXvrtftF0tCiNaYDfUIgL3/+AImpV1 d2QoUb5xBzp/rwuCfttZ1GNLH5ro9M7FyxelmSHEwvahc7zT9p5tAxaEydOUjI0ph3VL /U7adurRdeyE1Nz9Hum4FnJP49bOIH+1/UOVEfJWELAu3VkFK67PQwJLNCNtudVqXgXE /WgORiHN6IFJ1Gn4SY8n+rWQxkD1FtqPdzf9LeAJ8ymLniGa0IATUJb22l/Mq1lULOUt G0Rw== 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=m80oT1JfZEh7w9pLk5CWjzhWzy3pvKhfVuBt46eLCBw=; b=gawj4vO6/s5/xZlHPMqurSmTOja+Mf3N7iMNONf58ZRDapxTwQ6VAJ+E7Kqux1SU9k 2qrLSxNwc0SDLfdsqJd7b6MfJ8uyyT3zkN6+/p5JnC3Age2z1KgR4O1adPH1XY5LJrGi pA9tjVrxi1T4bn9Xw9kGOCy1tgvGuizhZNNyGYt/3gZA2rDfZZUHTWy2spZvJgRdcVuq mmALL1nU/g6LpPPRnMz+raS6T0DXd88NScVij/Io02i8PJaa3BPLC8a6EZeTkuWl0+ov +7vid0aVx1BUz/enRl8zV8tee/SK3dY1yfctDyOZAT4S3vyh1xFa8MzFhtQGK2FY3Bjm yhVQ== X-Gm-Message-State: AOAM532aw4UAkOgdsOOV2CO7tTWnpEK7exCAgigUH9ldQsmmd6gDAidO Y1hN2dt9gmhTyWXAWNF0U0z0R9bm8hBmdTZroRs6dA== X-Google-Smtp-Source: ABdhPJyqhSwQAMi7KabE5H8i99YpFBEAgyBaMgInJ4zyZ3IFflyUyoUrw58EdIQt6hUjGikYX6RbliJBfZjpbkt8VXQ= X-Received: by 2002:a37:49d6:: with SMTP id w205mr25091516qka.501.1605102736439; Wed, 11 Nov 2020 05:52:16 -0800 (PST) MIME-Version: 1.0 References: <000000000000d03eea0571adfe83@google.com> <000000000000ad052105b383350a@google.com> In-Reply-To: <000000000000ad052105b383350a@google.com> From: Dmitry Vyukov Date: Wed, 11 Nov 2020 14:52:05 +0100 Message-ID: Subject: Re: possible deadlock in mnt_want_write To: syzbot , LKML , linux-fsdevel , overlayfs , syzkaller-bugs Cc: Amir Goldstein Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-unionfs@vger.kernel.org On Sat, Nov 7, 2020 at 1:10 PM syzbot wrote: > > syzbot suspects this issue was fixed by commit: > > commit 146d62e5a5867fbf84490d82455718bfb10fe824 > Author: Amir Goldstein > Date: Thu Apr 18 14:42:08 2019 +0000 > > ovl: detect overlapping layers > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11e40184500000 > start commit: 6d906f99 Merge tag 'arm64-fixes' of git://git.kernel.org/p.. > git tree: upstream > kernel config: https://syzkaller.appspot.com/x/.config?x=856fc6d0fbbeede9 > dashboard link: https://syzkaller.appspot.com/bug?extid=ae82084b07d0297e566b > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=111767b7200000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1611ab2d200000 > > If the result looks correct, please mark the issue as fixed by replying with: > > #syz fix: ovl: detect overlapping layers > > For information about bisection process see: https://goo.gl/tpsmEJ#bisection #syz fix: ovl: detect overlapping layers