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 8E6A4C43381 for ; Tue, 19 Mar 2019 16:02:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 653C0206BA for ; Tue, 19 Mar 2019 16:02:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727833AbfCSQCY (ORCPT ); Tue, 19 Mar 2019 12:02:24 -0400 Received: from mail-io1-f69.google.com ([209.85.166.69]:43546 "EHLO mail-io1-f69.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727535AbfCSQCK (ORCPT ); Tue, 19 Mar 2019 12:02:10 -0400 Received: by mail-io1-f69.google.com with SMTP id n23so16571597ioj.10 for ; Tue, 19 Mar 2019 09:02:09 -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=QVXbb85YBUlns7yJ9jGjCpA+7Hkx5/eG/hgJRqhL1yY=; b=bmb5SacNPBLTua38kp0TP6g8y2rL0pCqh53HxFPS+TkBn4Z5QO6aw6sSXIxYVpjASb 1po6H2AvVN6g5Y/KFrrHa7PPlkIzrJjeOvgBseuGLWuu6wqZDuo5u2oT0G9jAfCASHuU +e8ZC3YDx/K8W6tgEf4+r/I8IU4zk2CcIN2f2Uo1AW3WAS/vKXNpo29x8UhmZRvEcC/a /0RBYDHm7uIhyfOAz4LynSanvBF+tJF+c8jVwfdPwvCz3mf0YfCqtSzqqBxve06+/ble xcOG+3yATh9oWWGT89d640LitJfeq15mfjcJ6eHeU5wPoZCeKqeTQYMXC2cvmTXqAwUP km6A== X-Gm-Message-State: APjAAAWSYuMO68ZBVh7hWrRPyRQ+tWnradV3qLjEIEULgr/0aGy7h5ki YJEcfRFLn8s0an7B/4x89H/cnKWqzSCG3QjYenpOdEI6d5mZ X-Google-Smtp-Source: APXvYqw0C3GmAeQm9tE0lxXLdDHxi096kmf4YHypyDn0icGWmnPuqsQF5oNXIWMd5xQgiPfvkBGG7VsdDIqMkyjjUw6XdRV3ES5m MIME-Version: 1.0 X-Received: by 2002:a24:152:: with SMTP id 79mr2324162itk.25.1553011329209; Tue, 19 Mar 2019 09:02:09 -0700 (PDT) Date: Tue, 19 Mar 2019 09:02:09 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000009c1aca058474a076@google.com> Subject: WARNING: suspicious RCU usage in xfrm_get_sadinfo From: syzbot To: davem@davemloft.net, herbert@gondor.apana.org.au, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, steffen.klassert@secunet.com, syzkaller-bugs@googlegroups.com 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: b9998194 Add linux-next specific files for 20190318 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=13b162a3200000 kernel config: https://syzkaller.appspot.com/x/.config?x=59cd5d43b5df6955 dashboard link: https://syzkaller.appspot.com/bug?extid=2792672c6a63f1dc867c compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11a2e24d200000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=131ab8ef200000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+2792672c6a63f1dc867c@syzkaller.appspotmail.com ============================= WARNING: suspicious RCU usage 5.1.0-rc1-next-20190318 #5 Not tainted ----------------------------- net/xfrm/xfrm_user.c:1080 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 1 lock held by syz-executor501/7913: #0: 0000000071883b7f (&net->xfrm.xfrm_cfg_mutex){+.+.}, at: xfrm_netlink_rcv+0x61/0x90 net/xfrm/xfrm_user.c:2691 stack backtrace: CPU: 1 PID: 7913 Comm: syz-executor501 Not tainted 5.1.0-rc1-next-20190318 #5 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+0x172/0x1f0 lib/dump_stack.c:113 lockdep_rcu_suspicious+0x153/0x15d kernel/locking/lockdep.c:5162 xfrm_nlmsg_unicast net/xfrm/xfrm_user.c:1080 [inline] xfrm_get_sadinfo+0x57b/0x650 net/xfrm/xfrm_user.c:1273 xfrm_user_rcv_msg+0x458/0x770 net/xfrm/xfrm_user.c:2684 netlink_rcv_skb+0x17a/0x460 net/netlink/af_netlink.c:2485 xfrm_netlink_rcv+0x70/0x90 net/xfrm/xfrm_user.c:2692 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] netlink_unicast+0x536/0x720 net/netlink/af_netlink.c:1336 netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1925 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:661 ___sys_sendmsg+0x806/0x930 net/socket.c:2260 __sys_sendmsg+0x105/0x1d0 net/socket.c:2298 __do_sys_sendmsg net/socket.c:2307 [inline] __se_sys_sendmsg net/socket.c:2305 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2305 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4401d9 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffe965c5678 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004401d9 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000003 --- 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. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches