Received: by 2002:a25:683:0:0:0:0:0 with SMTP id 125csp816245ybg; Wed, 10 Jun 2020 14:42:07 -0700 (PDT) X-Google-Smtp-Source: ABdhPJzVb/75AqFhGMtW+BQQH+JtHXeJzioPqO/q75wLpMzUQrydO12+xItU4I+SuhMna5wZa2Vr X-Received: by 2002:a17:906:4e57:: with SMTP id g23mr5257440ejw.522.1591825327429; Wed, 10 Jun 2020 14:42:07 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1591825327; cv=none; d=google.com; s=arc-20160816; b=nnBvVmggZ6zLZn5/B8IQMuL9jkDqIBLHnqXJ77lLweP3SihpDs+JPZwPo/u7VsCa1r za3mQ41TTzhlfWSAbTUKjhfFEkU1XmqjToqciBpayva8Huy4o3SoZmgxY6/FX1Latse5 w+0iLhnZoAs/a8KXkRPBHjFeL9CFdL6rE+2rTktfMMvvbUQvuNgNkk1i8jlZMhE7iUaG QSxl1pdrXL6/PZht0xQ4YsgdJm+ewL7wXOBNHLoo5o6ObNP7WefcG/SBU/BLQXUGLh1S kDpVyn5AzgT4QNk//P7X9B+qbkMiztWPd8Qgx2lMKmKgyJY9GM+FZD6JDrYJX0oW8P7R 0Kog== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:in-reply-to:content-disposition :mime-version:references:message-id:subject:cc:to:from:date; bh=sxh3v9iAu/l1oRKQHzayq6ZcTTjs8eTrjZxtKxzKGNw=; b=PWXirXzCF6dehi9Ul52ueJpzzH0dWFamKgPoq2GANWmt6VKCqWh7YYlfvWYmPAczqd ZtfRoqyRyVOpI34+DviCQx4SEp2X4pBPcbJZR0W5sjTWkTTnPdqH5HePZsV1LYQTLtmJ +Es+nWvsG9iBo6R01FgTCjh8TBl9LoslQOyNGYW9GAT05XcNLrGyrF5q7r9h5a7AE/Li UmwCgZeUgjUG5f32+oPEADDIvv56g6avdgiYQ97Py/KN9G0Ra8T8oNmQmSgidVgOtC58 bWzW6okF511PVGw+byxObT4PFiBCZfq2AvyglDCcFfG1OScZ3EOubzOGMzYeQqD6z+Po 7vWw== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-ext4-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-ext4-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id y7si509465edp.92.2020.06.10.14.41.33; Wed, 10 Jun 2020 14:42:07 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-ext4-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-ext4-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-ext4-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726260AbgFJVl0 (ORCPT + 99 others); Wed, 10 Jun 2020 17:41:26 -0400 Received: from outgoing-auth-1.mit.edu ([18.9.28.11]:60082 "EHLO outgoing.mit.edu" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726134AbgFJVl0 (ORCPT ); Wed, 10 Jun 2020 17:41:26 -0400 Received: from callcc.thunk.org (pool-100-0-195-244.bstnma.fios.verizon.net [100.0.195.244]) (authenticated bits=0) (User authenticated as tytso@ATHENA.MIT.EDU) by outgoing.mit.edu (8.14.7/8.12.4) with ESMTP id 05ALf7ss030984 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 10 Jun 2020 17:41:08 -0400 Received: by callcc.thunk.org (Postfix, from userid 15806) id 7DE2D4200DD; Wed, 10 Jun 2020 17:41:07 -0400 (EDT) Date: Wed, 10 Jun 2020 17:41:07 -0400 From: "Theodore Y. Ts'o" To: syzbot Cc: 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 Subject: Re: BUG: unable to handle kernel NULL pointer dereference in generic_perform_write (2) Message-ID: <20200610214107.GK1347934@mit.edu> References: <00000000000016a67305a33a11f7@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <00000000000016a67305a33a11f7@google.com> Sender: linux-ext4-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org #syz test: https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git 5b8b9d0c6d0e0f1993c6c56deaf9646942c49d94