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=-8.7 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,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 9542EC43461 for ; Sat, 12 Sep 2020 07:59:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 51A7520796 for ; Sat, 12 Sep 2020 07:59:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725859AbgILH7Y (ORCPT ); Sat, 12 Sep 2020 03:59:24 -0400 Received: from mail-io1-f80.google.com ([209.85.166.80]:33606 "EHLO mail-io1-f80.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725809AbgILH7V (ORCPT ); Sat, 12 Sep 2020 03:59:21 -0400 Received: by mail-io1-f80.google.com with SMTP id l22so8373655iol.0 for ; Sat, 12 Sep 2020 00:59:20 -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=K1eC26npFM21iPLw1juw36UDuBwQmF7YJQ6JoHuHm1A=; b=WZnsRlNsX5kcizWl2ihFaHZjsiZE1ZCt7hXM2EVyQ6aoDTyhUGPiiqHknRyWv3UJCq nKOEieAZrh+6vnPnlCBuKg+2xiWAKqc2lHs55jmjELmYh0+HcMh1wuLIlcJgiakW4fw6 1J7QGLXVoRewrgdSF6/7Ml/4jqbCgfnTvWOWRS3p7xua2q0yWVRwNM90jzoRm9g2y3Ar 0//pEajeK8DKiNvICvaWetJMtj7vXY/0O3UBIZSt6u7K3QlwLDbFN5AXzU8bH4piT6Dn FzLFQykxswJviyQ3bIBdpuIlLgyqO7iU5Ywl94+6BhyJayeMhNxaiPd6GAQncdHq9bH2 /7bQ== X-Gm-Message-State: AOAM530q6J692fXwofDBtfgmbX65DbCQ0C0eUGy9bKuLNYeyrZQD81vy qsSkNQQzt0Q0UAfM/JoGxEnY7EFeM+YSihGynpvVyBmVtA7h X-Google-Smtp-Source: ABdhPJx8BT91wIrjo3ZFIkeNWjp3bA7Tx8/VkHjR4AYJhKe7MStiXZUnh34Zbo82o5LDE38tJwMTN5jzpXY67/mN3qXG4tGgSOzE MIME-Version: 1.0 X-Received: by 2002:a92:5eda:: with SMTP id f87mr4745204ilg.279.1599897559904; Sat, 12 Sep 2020 00:59:19 -0700 (PDT) Date: Sat, 12 Sep 2020 00:59:19 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000bc383005af192dac@google.com> Subject: KMSAN: uninit-value in ip_check_mc_rcu (3) From: syzbot To: davem@davemloft.net, glider@google.com, kuba@kernel.org, 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" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: 3b3ea602 x86: add failure injection to get/put/clear_user git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=1357bd3e900000 kernel config: https://syzkaller.appspot.com/x/.config?x=3afe005fb99591f dashboard link: https://syzkaller.appspot.com/bug?extid=64be9532cb0d88808aad compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+64be9532cb0d88808aad@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in ip_check_mc_rcu+0x340/0x840 net/ipv4/igmp.c:2707 CPU: 0 PID: 8708 Comm: syz-executor.0 Not tainted 5.8.0-rc5-syzkaller #0 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+0x21c/0x280 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215 ip_check_mc_rcu+0x340/0x840 net/ipv4/igmp.c:2707 __mkroute_output+0x6a6/0x2860 net/ipv4/route.c:2388 ip_route_output_key_hash_rcu+0x1eb4/0x2000 net/ipv4/route.c:2669 ip_route_output_key_hash net/ipv4/route.c:2495 [inline] __ip_route_output_key include/net/route.h:126 [inline] ip_route_output_flow+0x211/0x420 net/ipv4/route.c:2758 ip_route_output_key include/net/route.h:142 [inline] ip_tunnel_xmit+0x1772/0x3aa0 net/ipv4/ip_tunnel.c:751 __gre_xmit net/ipv4/ip_gre.c:466 [inline] ipgre_xmit+0x12a2/0x13c0 net/ipv4/ip_gre.c:650 __netdev_start_xmit include/linux/netdevice.h:4611 [inline] netdev_start_xmit include/linux/netdevice.h:4625 [inline] xmit_one+0x3cf/0x750 net/core/dev.c:3556 dev_hard_start_xmit net/core/dev.c:3572 [inline] __dev_queue_xmit+0x3aad/0x4470 net/core/dev.c:4131 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4164 packet_snd net/packet/af_packet.c:2979 [inline] packet_sendmsg+0x8542/0x9a80 net/packet/af_packet.c:3004 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0xc82/0x1240 net/socket.c:2352 ___sys_sendmsg net/socket.c:2406 [inline] __sys_sendmsg+0x6d1/0x840 net/socket.c:2439 __do_sys_sendmsg net/socket.c:2448 [inline] __se_sys_sendmsg+0x97/0xb0 net/socket.c:2446 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2446 do_syscall_64+0xad/0x160 arch/x86/entry/common.c:386 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d5b9 Code: Bad RIP value. RSP: 002b:00007f2932958c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000002ccc0 RCX: 000000000045d5b9 RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000005 RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 000000000169fb6f R14: 00007f29329599c0 R15: 000000000118cf4c Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline] kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:310 __msan_chain_origin+0x50/0x90 mm/kmsan/kmsan_instr.c:165 ip_tunnel_init_flow include/net/ip_tunnels.h:248 [inline] ip_tunnel_xmit+0xe3d/0x3aa0 net/ipv4/ip_tunnel.c:733 __gre_xmit net/ipv4/ip_gre.c:466 [inline] ipgre_xmit+0x12a2/0x13c0 net/ipv4/ip_gre.c:650 __netdev_start_xmit include/linux/netdevice.h:4611 [inline] netdev_start_xmit include/linux/netdevice.h:4625 [inline] xmit_one+0x3cf/0x750 net/core/dev.c:3556 dev_hard_start_xmit net/core/dev.c:3572 [inline] __dev_queue_xmit+0x3aad/0x4470 net/core/dev.c:4131 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4164 packet_snd net/packet/af_packet.c:2979 [inline] packet_sendmsg+0x8542/0x9a80 net/packet/af_packet.c:3004 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0xc82/0x1240 net/socket.c:2352 ___sys_sendmsg net/socket.c:2406 [inline] __sys_sendmsg+0x6d1/0x840 net/socket.c:2439 __do_sys_sendmsg net/socket.c:2448 [inline] __se_sys_sendmsg+0x97/0xb0 net/socket.c:2446 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2446 do_syscall_64+0xad/0x160 arch/x86/entry/common.c:386 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline] kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:310 kmsan_memcpy_memmove_metadata+0x272/0x2e0 mm/kmsan/kmsan.c:247 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:267 __msan_memcpy+0x43/0x50 mm/kmsan/kmsan_instr.c:116 pskb_expand_head+0x3fd/0x1e30 net/core/skbuff.c:1636 __skb_cow include/linux/skbuff.h:3145 [inline] skb_cow_head include/linux/skbuff.h:3179 [inline] ipgre_xmit+0x88c/0x13c0 net/ipv4/ip_gre.c:629 __netdev_start_xmit include/linux/netdevice.h:4611 [inline] netdev_start_xmit include/linux/netdevice.h:4625 [inline] xmit_one+0x3cf/0x750 net/core/dev.c:3556 dev_hard_start_xmit net/core/dev.c:3572 [inline] __dev_queue_xmit+0x3aad/0x4470 net/core/dev.c:4131 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4164 packet_snd net/packet/af_packet.c:2979 [inline] packet_sendmsg+0x8542/0x9a80 net/packet/af_packet.c:3004 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0xc82/0x1240 net/socket.c:2352 ___sys_sendmsg net/socket.c:2406 [inline] __sys_sendmsg+0x6d1/0x840 net/socket.c:2439 __do_sys_sendmsg net/socket.c:2448 [inline] __se_sys_sendmsg+0x97/0xb0 net/socket.c:2446 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2446 do_syscall_64+0xad/0x160 arch/x86/entry/common.c:386 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline] kmsan_internal_poison_shadow+0x66/0xd0 mm/kmsan/kmsan.c:127 kmsan_slab_alloc+0x8a/0xe0 mm/kmsan/kmsan_hooks.c:80 slab_alloc_node mm/slub.c:2839 [inline] __kmalloc_node_track_caller+0xeab/0x12e0 mm/slub.c:4478 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0x35f/0xb30 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1083 [inline] alloc_skb_with_frags+0x1f2/0xc10 net/core/skbuff.c:5770 sock_alloc_send_pskb+0xc83/0xe50 net/core/sock.c:2356 packet_alloc_skb net/packet/af_packet.c:2827 [inline] packet_snd net/packet/af_packet.c:2922 [inline] packet_sendmsg+0x6abb/0x9a80 net/packet/af_packet.c:3004 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0xc82/0x1240 net/socket.c:2352 ___sys_sendmsg net/socket.c:2406 [inline] __sys_sendmsg+0x6d1/0x840 net/socket.c:2439 __do_sys_sendmsg net/socket.c:2448 [inline] __se_sys_sendmsg+0x97/0xb0 net/socket.c:2446 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2446 do_syscall_64+0xad/0x160 arch/x86/entry/common.c:386 entry_SYSCALL_64_after_hwframe+0x44/0xa9 ===================================================== --- This report is generated by a bot. 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