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=-6.7 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SHORT_SHORTNER,SPF_HELO_NONE,SPF_PASS autolearn=no 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 87051C433E9 for ; Tue, 5 Jan 2021 13:02:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 45C0D22AB9 for ; Tue, 5 Jan 2021 13:02:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730151AbhAENB6 (ORCPT ); Tue, 5 Jan 2021 08:01:58 -0500 Received: from mail-io1-f69.google.com ([209.85.166.69]:42002 "EHLO mail-io1-f69.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727148AbhAENB6 (ORCPT ); Tue, 5 Jan 2021 08:01:58 -0500 Received: by mail-io1-f69.google.com with SMTP id m9so13882781ioa.9 for ; Tue, 05 Jan 2021 05:01:42 -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:message-id:subject:from:to; bh=ru5bjWzHIyRK6ZRwLgZl3qBHXsr7G9Z+i9Dvu4uenWc=; b=pA5EKCua3yKr+T2y487N3vezrnW0amQPRSz77q2ouD8uS3l8LTGLljpcOgx/9KlW/K JuJnKcpVNKZDVYZvzhxDwr5vOWt0Utrsd+5ALjB4h9I4zHO8BnTcVwvgT4FyPfLqdLk3 LCYuESoib8ZNH8SUGgdLvFIOi6ZyChLtddLEzl+XK2AFMsGNubD3I7Vf5WPdw0ikinc5 G4gIBodpUqGWSayetsW6vfaTyoEl77zm8xbeKlFNa2VkofBPmal6KptL3yOwiboe3lLA UMhJvjwcetSdF8fqCEM7gCIJA7zdSHBmb2z1P/22I4ws3rfU4YY8MoMssS/s6W5+i77a uEOA== X-Gm-Message-State: AOAM531smvBO9hRkMkqbWB9jWOnxUnxVWf6LhZG55W2O0IcqrkO7e5uh hKB/vu4QrM2SeJopWXzVxqeL/5Fi3jS4+bnmvaxEKfUVAyKb X-Google-Smtp-Source: ABdhPJyofSzreOMWmIpdQM3UdYWqIn4pvNONeOx8NKjjsHQTu404iL2qhxZHzn1yjb+vIpXIB1phN2pTmte+ML7V93JcD0QySR7J MIME-Version: 1.0 X-Received: by 2002:a92:cec3:: with SMTP id z3mr73680933ilq.256.1609851677209; Tue, 05 Jan 2021 05:01:17 -0800 (PST) Date: Tue, 05 Jan 2021 05:01:17 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000005c7c1005b826cd7f@google.com> Subject: UBSAN: division-overflow in netem_enqueue From: syzbot To: davem@davemloft.net, jhs@mojatatu.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, stephen@networkplumber.org, syzkaller-bugs@googlegroups.com, xiyou.wangcong@gmail.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: 3db1a3fa Merge tag 'staging-5.11-rc1' of git://git.kernel... git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=1213cf60d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=a6e6725884106332 dashboard link: https://syzkaller.appspot.com/bug?extid=c32f013ef7b11871dba6 compiler: gcc (GCC) 10.1.0-syz 20200507 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+c32f013ef7b11871dba6@syzkaller.appspotmail.com ================================================================================ UBSAN: division-overflow in net/sched/sch_netem.c:516:27 division by zero CPU: 0 PID: 12279 Comm: syz-executor.4 Not tainted 5.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 ubsan_epilogue+0xb/0x5a lib/ubsan.c:148 __ubsan_handle_divrem_overflow.cold+0x7c/0xd0 lib/ubsan.c:252 netem_enqueue.cold+0x17/0xbc net/sched/sch_netem.c:516 netem_enqueue+0x2095/0x34e0 net/sched/sch_netem.c:483 __dev_xmit_skb net/core/dev.c:3789 [inline] __dev_queue_xmit+0x19ec/0x2ef0 net/core/dev.c:4101 __netlink_deliver_tap_skb net/netlink/af_netlink.c:295 [inline] __netlink_deliver_tap net/netlink/af_netlink.c:313 [inline] netlink_deliver_tap+0x9cb/0xc00 net/netlink/af_netlink.c:326 netlink_deliver_tap_kernel net/netlink/af_netlink.c:335 [inline] netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x5e5/0x7d0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x907/0xe10 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xd3/0x130 net/socket.c:672 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2336 ___sys_sendmsg+0xf3/0x170 net/socket.c:2390 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2423 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 Code: 0d b4 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 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f735a38fc68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e219 RDX: 0000000020000000 RSI: 0000000020000200 RDI: 0000000000000003 RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffecded56ef R14: 00007f735a3909c0 R15: 000000000119bf8c ================================================================================ --- This report 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 issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.