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=-5.7 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_PASS 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 6DAF8C43387 for ; Mon, 17 Dec 2018 07:14:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 36442206A2 for ; Mon, 17 Dec 2018 07:14:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731357AbeLQHOE (ORCPT ); Mon, 17 Dec 2018 02:14:04 -0500 Received: from mail-it1-f200.google.com ([209.85.166.200]:43405 "EHLO mail-it1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726395AbeLQHOE (ORCPT ); Mon, 17 Dec 2018 02:14:04 -0500 Received: by mail-it1-f200.google.com with SMTP id 128so13779161itw.8 for ; Sun, 16 Dec 2018 23:14:03 -0800 (PST) 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=rXMAPPEeU4vORkKr7jTQCMnehDc5YYYw8nB06I4FNFg=; b=KbOhsr//IPDshSCFrBQ2A379Mvhv0VdYJxlFCKAwRTEc11TlLzOYaMz5st6gIpKhLZ j48UHUiKSocTZTtyPhb/cStEQpyvEUg5B/nEKs30t8XFuJSeS9iwLj5umiLn8eES2vj0 o9CK07Ofr6Yo9ImN/vD7BaDx+2/YZ7Lj9s2onP6nSrWDHE4DoWhJX19MMKfJogAO8GnD 2SlcSyFm34kliPmqp+CLJLaCDYzZDaCXMTo86UsWWD1nlMye2hG5hc0jxSlmAuEVvIFh GbvFGY3HoFd2U5OEpt4LG+P76+ViIZg50kt7sPg9QRqi+daEbFiILp+CP7NOCIXWhJTJ 2ODA== X-Gm-Message-State: AA+aEWZTmZEB2rBh0A7Krn9mY38ivFRoQn3kiQfPc3TUmLIM9u7h+Wvz TXoUYz/VrMcFAXhgSxJ7xWCCHimXcYmX4xW+95tvJ3gbC4gl X-Google-Smtp-Source: AFSGD/W1zGiqb+prqDQ35F/iWiO8iZEWMB3ddCa5jGa/PKdYVK5dCEqaihzEXcDASLpyNqF5BHdogCQ3yaiSjeywDBFvayB28IO7 MIME-Version: 1.0 X-Received: by 2002:a5d:9b87:: with SMTP id r7mr6562218iom.31.1545030843313; Sun, 16 Dec 2018 23:14:03 -0800 (PST) Date: Sun, 16 Dec 2018 23:14:03 -0800 In-Reply-To: <0000000000001568af057cb456a8@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000009539c1057d328625@google.com> Subject: Re: KMSAN: uninit-value in __inet6_bind From: syzbot To: davem@davemloft.net, dvyukov@google.com, eric.dumazet@gmail.com, jon.maloy@ericsson.com, kuznet@ms2.inr.ac.ru, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, tipc-discussion@lists.sourceforge.net, xiyou.wangcong@gmail.com, ying.xue@windriver.com, yoshfuji@linux-ipv6.org Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org syzbot has found a reproducer for the following crash on: HEAD commit: 0a602458c72c kmsan: random: another take at unpoisoning CR.. git tree: https://github.com/google/kmsan.git/master console output: https://syzkaller.appspot.com/x/log.txt?x=129e1035400000 kernel config: https://syzkaller.appspot.com/x/.config?x=9b071100dcf8e641 dashboard link: https://syzkaller.appspot.com/bug?extid=c56449ed3652e6720f30 compiler: clang version 8.0.0 (trunk 348261) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10a97b2b400000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=108ec72b400000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+c56449ed3652e6720f30@syzkaller.appspotmail.com audit: type=1800 audit(1545030606.944:30): pid=6407 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Started in network mode Own node identity fe8000000000000000000000000000bb, cluster identity 4711 ================================================================== BUG: KMSAN: uninit-value in __inet6_bind+0xb35/0x1a30 net/ipv6/af_inet6.c:340 CPU: 1 PID: 6557 Comm: syz-executor447 Not tainted 4.20.0-rc5+ #2 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x220 lib/dump_stack.c:113 kmsan_report+0x12d/0x290 mm/kmsan/kmsan.c:682 __msan_warning+0x76/0xc0 mm/kmsan/kmsan_instr.c:316 __inet6_bind+0xb35/0x1a30 net/ipv6/af_inet6.c:340 inet6_bind+0x206/0x300 net/ipv6/af_inet6.c:441 kernel_bind+0xc6/0xf0 net/socket.c:3230 udp_sock_create6+0x2ee/0x890 net/ipv6/ip6_udp_tunnel.c:39 udp_sock_create include/net/udp_tunnel.h:61 [inline] tipc_udp_enable+0x166f/0x1d70 net/tipc/udp_media.c:742 tipc_enable_bearer net/tipc/bearer.c:302 [inline] __tipc_nl_bearer_enable+0x1213/0x1da0 net/tipc/bearer.c:897 tipc_nl_bearer_enable+0x6c/0xb0 net/tipc/bearer.c:905 genl_family_rcv_msg net/netlink/genetlink.c:601 [inline] genl_rcv_msg+0x185f/0x1a60 net/netlink/genetlink.c:626 netlink_rcv_skb+0x444/0x640 net/netlink/af_netlink.c:2477 genl_rcv+0x63/0x80 net/netlink/genetlink.c:637 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] netlink_unicast+0xf80/0x1060 net/netlink/af_netlink.c:1336 netlink_sendmsg+0x129d/0x1310 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg net/socket.c:631 [inline] ___sys_sendmsg+0xdbc/0x11d0 net/socket.c:2116 __sys_sendmsg net/socket.c:2154 [inline] __do_sys_sendmsg net/socket.c:2163 [inline] __se_sys_sendmsg+0x305/0x460 net/socket.c:2161 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2161 do_syscall_64+0xcd/0x110 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x444199 Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 1b d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffe96b1eb28 EFLAGS: 00000213 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000444199 RDX: 0000000000000000 RSI: 00000000200008c0 RDI: 0000000000000003 RBP: 00000000006ce018 R08: 0000000000000000 R09: 00000000004002e0 R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401e40 R13: 0000000000401ed0 R14: 0000000000000000 R15: 0000000000000000 Local variable description: ----udp6_addr@udp_sock_create6 Variable was created at: udp_sock_create6+0x80/0x890 net/ipv6/ip6_udp_tunnel.c:17 udp_sock_create include/net/udp_tunnel.h:61 [inline] tipc_udp_enable+0x166f/0x1d70 net/tipc/udp_media.c:742 ==================================================================