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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,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 793EBC4321D for ; Wed, 22 Aug 2018 04:11:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E069021486 for ; Wed, 22 Aug 2018 04:11:57 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E069021486 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ssi.bg 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 S1727953AbeHVHe6 (ORCPT ); Wed, 22 Aug 2018 03:34:58 -0400 Received: from ja.ssi.bg ([178.16.129.10]:42998 "EHLO ja.ssi.bg" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1726469AbeHVHe6 (ORCPT ); Wed, 22 Aug 2018 03:34:58 -0400 Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by ja.ssi.bg (8.15.2/8.15.2) with ESMTP id w7M4BfiW002518; Wed, 22 Aug 2018 07:11:41 +0300 Date: Wed, 22 Aug 2018 07:11:41 +0300 (EEST) From: Julian Anastasov To: Cong Wang cc: syzbot+30209ea299c09d8785c9@syzkaller.appspotmail.com, ddstreet@ieee.org, Dmitry Vyukov , LKML , Linux Kernel Network Developers , syzkaller-bugs@googlegroups.com Subject: Re: unregister_netdevice: waiting for DEV to become free (2) In-Reply-To: Message-ID: References: <0000000000007d22100573d66078@google.com> User-Agent: Alpine 2.20 (LFD 67 2015-01-07) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, On Mon, 20 Aug 2018, Cong Wang wrote: > For the one I look into, dst_cache doesn't matter, because the xmit > path doesn't even use tunnel dst_cache at all, and it is ip6tnl0 FB > device, unlike this one which is tun device. Ops, of course, it is dev tun and not ip tun... > For the one I look into, it seems some fib6_info is not released for > some reason. It seems to be the one created by addrconf_prefix_route(), > which is supposed to be released by fib6_clean_tree() I think, but it > never happens. May be, it is not direct reference to dev but one that is moved to loopback, like from dst, route... The repro.c creates permanent neighbours and addresses. Regards -- Julian Anastasov