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=-0.4 required=3.0 tests=FROM_LOCAL_HEX, 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 E5E3BC6778F for ; Fri, 27 Jul 2018 13:12:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9FDB2208B0 for ; Fri, 27 Jul 2018 13:12:17 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9FDB2208B0 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 S2388431AbeG0OeI (ORCPT ); Fri, 27 Jul 2018 10:34:08 -0400 Received: from mail-it0-f70.google.com ([209.85.214.70]:36217 "EHLO mail-it0-f70.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732090AbeG0Odz (ORCPT ); Fri, 27 Jul 2018 10:33:55 -0400 Received: by mail-it0-f70.google.com with SMTP id m185-v6so5292256itm.1 for ; Fri, 27 Jul 2018 06:12:02 -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:message-id:subject:from:to; bh=2N9DMv24efF5ZrKgieSujxTr85hicunYrxRghaHVjEI=; b=Sh7vRBIkjCHcPB4VVMBUtk6k2GUZcv6cEGObgFH3ahzVO+0HguSPPtVyIR3pLI6/Ra Cc1lojBkmlRhBYCCtkh3WzW9682b3w4Sbflbz0mFqHqSv2r/szs9Nm9ncd9uO1XnrabO oOcWA3zX/H5JivyJHFhvwdE72ox/hl6tTqgj2WbZrHzOsD96ZGoJdEFnhPejwt2uyg1Q vtdjmDMl2Ra46rLja0n9G+q0WuB2Y4oxEdlASEvEWtPHf3JhIa5juv8dwgaJOm1M7zFf Vji2lnBwMvHoQCU5WrSlOupyfq9F1zLdwrOQ5JbQubLY7ZOV+URN0ex05fi6REm4VNqM qyxw== X-Gm-Message-State: AOUpUlFTx8J/N9J8e7Z+15eneJG0qbVhjS8klcbswQTy83PdxKYDXOgF tOWZhtUfr0HXYxeoCr3pQxLKAxeP4tT2OPVUWW/i8oMFzIj0 X-Google-Smtp-Source: AAOMgpeJI9gRkWKZWCRbAU36jc7TSEbbDEjkMWbWcpzVI6jngyBAg6c8425x5IvBJj7mhI9Sofvna5VK8dVO/8tFyStQqr4Re+1N MIME-Version: 1.0 X-Received: by 2002:a24:6253:: with SMTP id d80-v6mr2963900itc.23.1532697122101; Fri, 27 Jul 2018 06:12:02 -0700 (PDT) Date: Fri, 27 Jul 2018 06:12:02 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000082e3a90571fadb4c@google.com> Subject: KMSAN: uninit-value in sit_tunnel_xmit 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 Hello, syzbot found the following crash on: HEAD commit: d1c2a46a46f6 kmsan: update LLVM/Clang patches to r337583. git tree: https://github.com/google/kmsan.git/master console output: https://syzkaller.appspot.com/x/log.txt?x=17d4570c400000 kernel config: https://syzkaller.appspot.com/x/.config?x=31cf75cbffdedb44 dashboard link: https://syzkaller.appspot.com/bug?extid=782ee96f9147673d8822 compiler: clang version 7.0.0 (trunk 334104) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+782ee96f9147673d8822@syzkaller.appspotmail.com IPVS: Scheduler module ip_vs_mh not found ================================================================== BUG: KMSAN: uninit-value in __ipv6_prefix_equal64_half include/net/ipv6.h:522 [inline] BUG: KMSAN: uninit-value in ipv6_prefix_equal include/net/ipv6.h:539 [inline] BUG: KMSAN: uninit-value in check_6rd net/ipv6/sit.c:771 [inline] BUG: KMSAN: uninit-value in try_6rd net/ipv6/sit.c:805 [inline] BUG: KMSAN: uninit-value in ipip6_tunnel_xmit net/ipv6/sit.c:865 [inline] BUG: KMSAN: uninit-value in sit_tunnel_xmit+0x1ad3/0x3b00 net/ipv6/sit.c:1029 CPU: 0 PID: 7135 Comm: syz-executor4 Not tainted 4.18.0-rc5+ #29 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+0x185/0x1e0 lib/dump_stack.c:113 kmsan_report+0x195/0x2c0 mm/kmsan/kmsan.c:982 __msan_warning+0x7d/0xe0 mm/kmsan/kmsan_instr.c:645 IPVS: Scheduler module ip_vs_mh not found __ipv6_prefix_equal64_half include/net/ipv6.h:522 [inline] ipv6_prefix_equal include/net/ipv6.h:539 [inline] check_6rd net/ipv6/sit.c:771 [inline] try_6rd net/ipv6/sit.c:805 [inline] ipip6_tunnel_xmit net/ipv6/sit.c:865 [inline] sit_tunnel_xmit+0x1ad3/0x3b00 net/ipv6/sit.c:1029 __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+0x60f/0xcc0 net/core/dev.c:3050 __dev_queue_xmit+0x3060/0x3c70 net/core/dev.c:3569 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3602 packet_snd net/packet/af_packet.c:2919 [inline] packet_sendmsg+0x8469/0x9010 net/packet/af_packet.c:2944 sock_sendmsg_nosec net/socket.c:641 [inline] sock_sendmsg net/socket.c:651 [inline] ___sys_sendmsg+0xed9/0x1350 net/socket.c:2125 __sys_sendmsg net/socket.c:2163 [inline] __do_sys_sendmsg net/socket.c:2172 [inline] __se_sys_sendmsg net/socket.c:2170 [inline] __x64_sys_sendmsg+0x3b0/0x520 net/socket.c:2170 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x455ab9 Code: 1d ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f68d21b1c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f68d21b26d4 RCX: 0000000000455ab9 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004c1066 R14: 00000000004d16c8 R15: 0000000000000000 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:256 [inline] kmsan_internal_poison_shadow+0xc8/0x1d0 mm/kmsan/kmsan.c:181 kmsan_kmalloc+0xa1/0x120 mm/kmsan/kmsan_hooks.c:91 kmsan_slab_alloc+0x10/0x20 mm/kmsan/kmsan_hooks.c:100 slab_post_alloc_hook mm/slab.h:446 [inline] slab_alloc_node mm/slub.c:2720 [inline] __kmalloc_node_track_caller+0xb48/0x11d0 mm/slub.c:4353 __kmalloc_reserve net/core/skbuff.c:138 [inline] __alloc_skb+0x2cb/0x9e0 net/core/skbuff.c:206 alloc_skb include/linux/skbuff.h:988 [inline] alloc_skb_with_frags+0x1e6/0xb80 net/core/skbuff.c:5271 sock_alloc_send_pskb+0xb59/0x11e0 net/core/sock.c:2095 packet_alloc_skb net/packet/af_packet.c:2776 [inline] packet_snd net/packet/af_packet.c:2867 [inline] packet_sendmsg+0x68cb/0x9010 net/packet/af_packet.c:2944 sock_sendmsg_nosec net/socket.c:641 [inline] sock_sendmsg net/socket.c:651 [inline] ___sys_sendmsg+0xed9/0x1350 net/socket.c:2125 __sys_sendmsg net/socket.c:2163 [inline] __do_sys_sendmsg net/socket.c:2172 [inline] __se_sys_sendmsg net/socket.c:2170 [inline] __x64_sys_sendmsg+0x3b0/0x520 net/socket.c:2170 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x63/0xe7 ================================================================== --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with syzbot.