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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 8581BC76186 for ; Wed, 17 Jul 2019 10:14:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6373421743 for ; Wed, 17 Jul 2019 10:14:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727996AbfGQKOp (ORCPT ); Wed, 17 Jul 2019 06:14:45 -0400 Received: from www262.sakura.ne.jp ([202.181.97.72]:63867 "EHLO www262.sakura.ne.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725893AbfGQKOo (ORCPT ); Wed, 17 Jul 2019 06:14:44 -0400 Received: from fsav305.sakura.ne.jp (fsav305.sakura.ne.jp [153.120.85.136]) by www262.sakura.ne.jp (8.15.2/8.15.2) with ESMTP id x6HADtYS087173; Wed, 17 Jul 2019 19:13:55 +0900 (JST) (envelope-from penguin-kernel@i-love.sakura.ne.jp) Received: from www262.sakura.ne.jp (202.181.97.72) by fsav305.sakura.ne.jp (F-Secure/fsigk_smtp/530/fsav305.sakura.ne.jp); Wed, 17 Jul 2019 19:13:55 +0900 (JST) X-Virus-Status: clean(F-Secure/fsigk_smtp/530/fsav305.sakura.ne.jp) Received: from [192.168.1.8] (softbank126012062002.bbtec.net [126.12.62.2]) (authenticated bits=0) by www262.sakura.ne.jp (8.15.2/8.15.2) with ESMTPSA id x6HADodo087151 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NO); Wed, 17 Jul 2019 19:13:55 +0900 (JST) (envelope-from penguin-kernel@i-love.sakura.ne.jp) Subject: Re: KASAN: use-after-free Write in check_noncircular To: Dmitry Vyukov References: <0000000000001e443b058ddcb128@google.com> Cc: syzbot , ast@kernel.org, daniel@iogearbox.net, john.fastabend@gmail.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com From: Tetsuo Handa Message-ID: Date: Wed, 17 Jul 2019 19:13:52 +0900 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <0000000000001e443b058ddcb128@google.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is not a TOMOYO's bug. But On 2019/07/17 17:58, syzbot wrote: > ================================================================== > BUG: KASAN: use-after-free in check_noncircular+0x91/0x560 kernel/locking/lockdep.c:1722 > Write of size 56 at addr ffff888089815160 by task syz-executor.4/8772 > > CPU: 1 PID: 8772 Comm: syz-executor.4 Not tainted 5.2.0+ #31 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > Call Trace: > what happened here? No trace was printed to console output? > Allocated by task 8457: