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=-5.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 829D8C433DF for ; Thu, 11 Jun 2020 00:25:05 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 48A7020747 for ; Thu, 11 Jun 2020 00:25:05 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 48A7020747 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id BCF298D0052; Wed, 10 Jun 2020 20:25:04 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id B7FBF8D004C; Wed, 10 Jun 2020 20:25:04 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A6F5F8D0052; Wed, 10 Jun 2020 20:25:04 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0077.hostedemail.com [216.40.44.77]) by kanga.kvack.org (Postfix) with ESMTP id 917D88D004C for ; Wed, 10 Jun 2020 20:25:04 -0400 (EDT) Received: from smtpin28.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 3203F356B for ; Thu, 11 Jun 2020 00:25:04 +0000 (UTC) X-FDA: 76915036128.28.robin65_2809ce026dcf Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin28.hostedemail.com (Postfix) with ESMTP id 130FD6C2C for ; Thu, 11 Jun 2020 00:25:04 +0000 (UTC) X-HE-Tag: robin65_2809ce026dcf X-Filterd-Recvd-Size: 2689 Received: from mail-io1-f70.google.com (mail-io1-f70.google.com [209.85.166.70]) by imf29.hostedemail.com (Postfix) with ESMTP for ; Thu, 11 Jun 2020 00:25:03 +0000 (UTC) Received: by mail-io1-f70.google.com with SMTP id z12so2730049iow.15 for ; Wed, 10 Jun 2020 17:25:03 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:in-reply-to:message-id:subject :from:to; bh=5h8mXCxAyDZSlKXtJUEYKqhTlNYUsrPeduOrUEGY4RQ=; b=Thb9Toj3geEXfXVW/JbkTff4arM9Y35T9AZcXMyyoQeEwwbRLc3Hj7Mh2wtTEqj0KM OJyZF37fr10X5nLAnYqvhUfv9ESeHrtyHqAPFLfsaRcDhqkxEmyVRWHSmkzUYZdEj/kw GO5LdPdDjtb2xpG1eoUmy9SBR0dmON59KTxeWnkTazSwtW2eg0++TECITwzS8DanQ5BN 8FyCbhirW0kBEw7jiOjDAJDPKY75wM8G9Ij59t0dQzmtXr9a+WKwZv/VOGmSbWux81et /5jvQ7SmilM5yJ60Bvf7PBiiQkfTt/LCkX+XPHVdnnjrOzvRGpxQWnGgp3PPiKwPZ/kg Yo0Q== X-Gm-Message-State: AOAM530kuZwtF1Edo97LP4HtTd70fiXvHWTrgdh8/gIdGha/1rwRHygh BFOsCw7Jd6ssMAj1t6MYI92ouc/F9k1rK7b0hiUO1mC/CG7N X-Google-Smtp-Source: ABdhPJyrMgQvz66Vb9aVe5TnjxkkUv8YU1EGJlD+BgcZtIAC9MgHdnop0BgRS67Ewa1mFKkjCYM2u6Us3ThS9zyTBpDa96B8JLeb MIME-Version: 1.0 X-Received: by 2002:a05:6638:406:: with SMTP id q6mr800041jap.125.1591835102980; Wed, 10 Jun 2020 17:25:02 -0700 (PDT) Date: Wed, 10 Jun 2020 17:25:02 -0700 In-Reply-To: <20200610220710.GL1347934@mit.edu> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000dab72f05a7c3fd77@google.com> Subject: Re: BUG: unable to handle kernel NULL pointer dereference in generic_perform_write (2) From: syzbot To: adilger.kernel@dilger.ca, akpm@linux-foundation.org, dan.j.williams@intel.com, jack@suse.cz, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, tytso@mit.edu Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: 130FD6C2C X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam01 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Hello, syzbot has tested the proposed patch and the reproducer did not trigger crash: Reported-and-tested-by: syzbot+bca9799bf129256190da@syzkaller.appspotmail.com Tested on: commit: 5749fe5a ext4: avoid race conditions when remounting with .. git tree: https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git kernel config: https://syzkaller.appspot.com/x/.config?x=175fcaead7a60c3f dashboard link: https://syzkaller.appspot.com/bug?extid=bca9799bf129256190da compiler: gcc (GCC) 9.0.0 20181231 (experimental) Note: testing is done by a robot and is best-effort only.