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=-0.7 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,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 1FE77C46460 for ; Thu, 9 Aug 2018 20:02:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CCF032238F for ; Thu, 9 Aug 2018 20:02:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CCF032238F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com 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 S1727155AbeHIW20 (ORCPT ); Thu, 9 Aug 2018 18:28:26 -0400 Received: from mail-io0-f198.google.com ([209.85.223.198]:53266 "EHLO mail-io0-f198.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726997AbeHIW20 (ORCPT ); Thu, 9 Aug 2018 18:28:26 -0400 Received: by mail-io0-f198.google.com with SMTP id o24-v6so5177433iob.20 for ; Thu, 09 Aug 2018 13:02:03 -0700 (PDT) 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=AwQHUVdsm/0ybSlzEa27ZZ0Dgx/4eS74dKKOoXrMPZo=; b=l/58UEnrjIYvJWshpLWjA2hJEfk9veC+Mw17v2/fdNMO5gsigBtqYhETDyQfTxgepW Au7ybVk5vO0lt/9ClOze4BlGbTJ8OZe5zOp45MQz/KefPGVjw5tb3yxKSX2JACB8lJsh L9lCoZXOoB2oANfcBiBaNB9456j/TDWTn3LmMJHhDJynRNknebR2uvWmd108ujUSsUB0 QzWw7ySibrStAGrOSnYw1UGWlkesAETCWljMJAw+qBlbeMZXV8YVDkXBhjgfFbS3j7Wa zXcUoEDaWJVD9FMUsmKXOKz8pF3cm0rNOPCBgbA8b5HwNyvPNC48k7UTYt1BOlSBag8a jt3Q== X-Gm-Message-State: AOUpUlFXuO5oywq5kxWB4wMZ1mY/ARjFRwnsKyHOu68DrNcvssezQ4V8 9ApFLOcbyO3pfQ6XCA2mnIhKk1XQmqQu37khKYKpy//1Cjzj X-Google-Smtp-Source: AA+uWPzYKWPFK5odDtIKh3VLDiawnxAhVeLGc+oWHQw0ACZFCFt+L26DGg+r/bFOw7wv3KTUcDxQxc93JOjz6rMa3bwf+Cm76AIC MIME-Version: 1.0 X-Received: by 2002:a5e:8819:: with SMTP id l25-v6mr1460932ioj.25.1533844923239; Thu, 09 Aug 2018 13:02:03 -0700 (PDT) Date: Thu, 09 Aug 2018 13:02:03 -0700 In-Reply-To: <000000000000f68d660570dcddd8@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000ca55900573061971@google.com> Subject: Re: kernel BUG at net/ipv4/ip_output.c:LINE! From: syzbot To: davem@davemloft.net, kuznet@ms2.inr.ac.ru, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.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: 112cbae26d18 Merge branch 'linus' of git://git.kernel.org/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1192ae72400000 kernel config: https://syzkaller.appspot.com/x/.config?x=152cb8ccd35b1f70 dashboard link: https://syzkaller.appspot.com/bug?extid=90d5ec0c05e708f3b66d compiler: gcc (GCC) 8.0.1 20180413 (experimental) syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=153ed6e2400000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1539038c400000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+90d5ec0c05e708f3b66d@syzkaller.appspotmail.com IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready 8021q: adding VLAN 0 to HW filter on device team0 ------------[ cut here ]------------ kernel BUG at net/ipv4/ip_output.c:775! invalid opcode: 0000 [#1] SMP KASAN CPU: 1 PID: 4713 Comm: syz-executor450 Not tainted 4.18.0-rc8+ #182 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ip_do_fragment+0x2436/0x2aa0 net/ipv4/ip_output.c:775 Code: 8b 8d 70 fe ff ff e9 99 e8 ff ff 4c 89 ef e8 a1 65 40 fc e9 7b e9 ff ff 4c 89 f7 e8 94 65 40 fc e9 f3 e5 ff ff e8 7a 89 02 fc <0f> 0b 4c 89 e7 e8 80 65 40 fc e9 b7 e8 ff ff 4c 89 f7 89 8d 70 fe RSP: 0018:ffff8801cfe3e880 EFLAGS: 00010293 RAX: ffff8801af542080 RBX: ffff8801c88eaa00 RCX: ffffffff85797886 RDX: 0000000000000000 RSI: ffffffff85798ed6 RDI: 0000000000000005 RBP: ffff8801cfe3ea58 R08: ffff8801af542080 R09: ffffed0039110032 R10: ffffed0039110034 R11: ffff8801c88801a3 R12: ffff8801c88eaac4 R13: 00000000fffffff2 R14: ffff8801c88eaad0 R15: dffffc0000000000 FS: 0000000001479880(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000001cf669000 CR4: 00000000001406e0 Call Trace: ip_fragment.constprop.49+0x179/0x240 net/ipv4/ip_output.c:548 ip_finish_output+0x6e4/0xfa0 net/ipv4/ip_output.c:315 NF_HOOK_COND include/linux/netfilter.h:276 [inline] ip_output+0x223/0x880 net/ipv4/ip_output.c:405 dst_output include/net/dst.h:444 [inline] ip_local_out+0xc5/0x1b0 net/ipv4/ip_output.c:124 iptunnel_xmit+0x53b/0x800 net/ipv4/ip_tunnel_core.c:91 ip_tunnel_xmit+0x1598/0x3af1 net/ipv4/ip_tunnel.c:778 __gre_xmit+0x5b7/0x950 net/ipv4/ip_gre.c:449 ipgre_xmit+0x3e8/0xb50 net/ipv4/ip_gre.c:701 __netdev_start_xmit include/linux/netdevice.h:4148 [inline] netdev_start_xmit include/linux/netdevice.h:4157 [inline] xmit_one net/core/dev.c:3034 [inline] dev_hard_start_xmit+0x26c/0xc30 net/core/dev.c:3050 __dev_queue_xmit+0x29c2/0x38e0 net/core/dev.c:3569 dev_queue_xmit+0x17/0x20 net/core/dev.c:3602 __bpf_tx_skb net/core/filter.c:1995 [inline] __bpf_redirect_common net/core/filter.c:2033 [inline] __bpf_redirect+0x563/0xa80 net/core/filter.c:2040 ____bpf_clone_redirect net/core/filter.c:2073 [inline] bpf_clone_redirect+0x2f6/0x490 net/core/filter.c:2045 bpf_prog_bebbfe2050753572+0xef4/0x1000 Modules linked in: Dumping ftrace buffer: (ftrace buffer empty) ---[ end trace b3cbe48b5e178b8d ]--- RIP: 0010:ip_do_fragment+0x2436/0x2aa0 net/ipv4/ip_output.c:775 Code: 8b 8d 70 fe ff ff e9 99 e8 ff ff 4c 89 ef e8 a1 65 40 fc e9 7b e9 ff ff 4c 89 f7 e8 94 65 40 fc e9 f3 e5 ff ff e8 7a 89 02 fc <0f> 0b 4c 89 e7 e8 80 65 40 fc e9 b7 e8 ff ff 4c 89 f7 89 8d 70 fe RSP: 0018:ffff8801cfe3e880 EFLAGS: 00010293 RAX: ffff8801af542080 RBX: ffff8801c88eaa00 RCX: ffffffff85797886 RDX: 0000000000000000 RSI: ffffffff85798ed6 RDI: 0000000000000005 RBP: ffff8801cfe3ea58 R08: ffff8801af542080 R09: ffffed0039110032 R10: ffffed0039110034 R11: ffff8801c88801a3 R12: ffff8801c88eaac4 R13: 00000000fffffff2 R14: ffff8801c88eaad0 R15: dffffc0000000000 FS: 0000000001479880(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000001cf669000 CR4: 00000000001406e0