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=-2.4 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,T_DKIMWL_WL_HIGH, USER_AGENT_MUTT 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 A2F60C04AB1 for ; Thu, 9 May 2019 17:29:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 786AB216C4 for ; Thu, 9 May 2019 17:29:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1557422997; bh=/XvTIuVUeOT5/PLkyyM03I9QreYBiN7G9BlfJVv6zuc=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=ThXR0i+uOWLdhIlYtcj5U3oecFy6tZLF+5dd8RD+C/V1Nt3RqI0d7dzF21T2LTMMC t6xK0DXyD9SdB8SsQu6X2w9fOdagoc8oPDAWQNy1Cmk+M2ay/bW8TDPlji/Tphe3Lt 5srmr3sTtVPlJ8zufvELQEqLr6kbbrCuj/yKAj5M= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726658AbfEIR35 (ORCPT ); Thu, 9 May 2019 13:29:57 -0400 Received: from mail.kernel.org ([198.145.29.99]:59112 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726576AbfEIR34 (ORCPT ); Thu, 9 May 2019 13:29:56 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id A592820675; Thu, 9 May 2019 17:29:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1557422996; bh=/XvTIuVUeOT5/PLkyyM03I9QreYBiN7G9BlfJVv6zuc=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=nrYbKRx/K4EqiwdgX8fJiVoqmfauEO3jI7DW9EdV5TmA18m97Ap7k8WP7IAgqBlgC vUM88DSVIPNAnFL7RAL8Ym57F3YViANNlQh4R9gcbto9RorjU2qCCwLSliF52gkzEs aLGh4ex0p22KiDhH0CXZrTruVywvXOAyoK66o03I= Date: Thu, 9 May 2019 19:29:53 +0200 From: Greg KH To: Zubin Mithra Cc: stable@vger.kernel.org, groeck@chromium.org, xiyou.wangcong@gmail.com, davem@davemloft.net, kuznet@ms2.inr.ac.ru, jmorris@namei.org, yoshfuji@linux-ipv6.org, kaber@trash.net Subject: Re: 8651be8f14a1 ("ipv6: fix a potential deadlock in do_ipv6_setsockopt()") Message-ID: <20190509172953.GA32587@kroah.com> References: <20190509165413.GA126940@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190509165413.GA126940@google.com> User-Agent: Mutt/1.11.4 (2019-03-13) Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org On Thu, May 09, 2019 at 09:54:14AM -0700, Zubin Mithra wrote: > Hello, > > Syzkaller has triggered a lockdep warning when fuzzing a 4.4 kernel with the following stacktrace. > > Call Trace: > [] __dump_stack lib/dump_stack.c:15 [inline] > [] dump_stack+0xc1/0x124 lib/dump_stack.c:51 > [] print_circular_bug.cold.51+0x1bd/0x27d kernel/locking/lockdep.c:1226 > [] check_prev_add kernel/locking/lockdep.c:1853 [inline] > [] check_prevs_add kernel/locking/lockdep.c:1958 [inline] > [] validate_chain kernel/locking/lockdep.c:2144 [inline] > [] __lock_acquire+0x38da/0x52a0 kernel/locking/lockdep.c:3213 > [] lock_acquire+0x15e/0x440 kernel/locking/lockdep.c:3592 > [] __mutex_lock_common kernel/locking/mutex.c:624 [inline] > [] mutex_lock_nested+0xc6/0x10b0 kernel/locking/mutex.c:744 > [] rtnl_lock+0x1c/0x20 net/core/rtnetlink.c:70 > [] ipv6_sock_mc_close+0x113/0x350 net/ipv6/mcast.c:288 > [] do_ipv6_setsockopt.isra.12+0xce6/0x2cc0 net/ipv6/ipv6_sockglue.c:202 > [] ipv6_setsockopt+0x9c/0x130 net/ipv6/ipv6_sockglue.c:905 > [] udpv6_setsockopt+0x4f/0x90 net/ipv6/udp.c:1436 > [] sock_common_setsockopt+0x9f/0xe0 net/core/sock.c:2693 > [] SYSC_setsockopt net/socket.c:1780 [inline] > [] SyS_setsockopt+0x163/0x250 net/socket.c:1759 > [] entry_SYSCALL_64_fastpath+0x1e/0xa0 > > Could the following patch be applied in order to v4.4.y? This patch is present in > linux-4.9.y. > * 8651be8f14a1 ("ipv6: fix a potential deadlock in do_ipv6_setsockopt()") > > Tests run: > * Chrome OS tryjobs > * Syzkaller reproducer Now queued up, thanks. greg k-h