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=-5.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS autolearn=unavailable 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 05B9EC41621 for ; Tue, 24 Mar 2020 07:40:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D5A7120771 for ; Tue, 24 Mar 2020 07:40:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727453AbgCXHkO (ORCPT ); Tue, 24 Mar 2020 03:40:14 -0400 Received: from mail-il1-f200.google.com ([209.85.166.200]:35531 "EHLO mail-il1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726094AbgCXHkO (ORCPT ); Tue, 24 Mar 2020 03:40:14 -0400 Received: by mail-il1-f200.google.com with SMTP id t10so6451054ilf.2 for ; Tue, 24 Mar 2020 00:40:13 -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=7B4kfMh39+8DdH4Qp0mkLrAt9ER1GH0d0UIRcScJtEs=; b=oQqNvd1x0nMwiNGec2a4CcO8egRziO+RbYZFKXg8D7eL+BYSbgrxNsV7VMuZ8Wu5Zh +s2TPhO1HvPJvpPnGQvcqLAM8wpwVPMXP5Fwpbe6iL9yxADEjnJbRt7orE1w1eSuxOGR MpQQqV0ATzQ7Gy+lBjH0TX4aQMeJSCgtAXWGJvmRKC7d+NrfUW4K4VbZNg/eeJ8AUEo5 wEhNyLklxALhucX70+jh2OLXiG3y+PF5PjvlkdzNmFRFQ8fbUc5uVF2hWL/LYFrFDSBB seznG9xC+EHSd0fN4JjX5XiSRbu+XBcUfLmIxfs8HuxZ5Wzg/1ap8feHE0SwucM17+mT F6iw== X-Gm-Message-State: ANhLgQ07mUMsXQXJxn83RT7ciJ2PK4ziCo+ickicXtitSS2yJ4sQpuS0 68RPUEwrM0H6ZcWyhYIkAeM6lDPToXnlDRtsY6m3VfNX3Mef X-Google-Smtp-Source: ADFU+vsHuYVF/h1qjUhCD4/SGZ5h85xy9+ItYSbssSQpH94LZyOHAEX5oyBMY+bwKhCOuyVdvNgDdzdB2chcrGnY6+BRnW2aQxxE MIME-Version: 1.0 X-Received: by 2002:a6b:1451:: with SMTP id 78mr23368265iou.23.1585035612280; Tue, 24 Mar 2020 00:40:12 -0700 (PDT) Date: Tue, 24 Mar 2020 00:40:12 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000a0627105a194dc93@google.com> Subject: WARNING: refcount bug in route4_destroy From: syzbot To: davem@davemloft.net, jhs@mojatatu.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, xiyou.wangcong@gmail.com 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 crash on: HEAD commit: cd607737 Merge tag '5.6-rc6-smb3-fixes' of git://git.samba.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10f4561de00000 kernel config: https://syzkaller.appspot.com/x/.config?x=9f894bd92023de02 dashboard link: https://syzkaller.appspot.com/bug?extid=36788b38ba78ab3c9c1f compiler: gcc (GCC) 9.0.0 20181231 (experimental) 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+36788b38ba78ab3c9c1f@syzkaller.appspotmail.com ------------[ cut here ]------------ refcount_t: saturated; leaking memory. WARNING: CPU: 1 PID: 26742 at lib/refcount.c:19 refcount_warn_saturate+0xf4/0x1e0 lib/refcount.c:19 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 26742 Comm: kworker/u4:3 Not tainted 5.6.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x188/0x20d lib/dump_stack.c:118 panic+0x2e3/0x75c kernel/panic.c:221 __warn.cold+0x2f/0x35 kernel/panic.c:582 report_bug+0x27b/0x2f0 lib/bug.c:195 fixup_bug arch/x86/kernel/traps.c:174 [inline] fixup_bug arch/x86/kernel/traps.c:169 [inline] do_error_trap+0x12b/0x220 arch/x86/kernel/traps.c:267 do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:286 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027 RIP: 0010:refcount_warn_saturate+0xf4/0x1e0 lib/refcount.c:19 Code: 1d 24 4d d2 06 31 ff 89 de e8 e8 47 e3 fd 84 db 75 ab e8 af 46 e3 fd 48 c7 c7 00 a9 51 88 c6 05 04 4d d2 06 01 e8 94 57 b5 fd <0f> 0b eb 8f e8 93 46 e3 fd 0f b6 1d ee 4c d2 06 31 ff 89 de e8 b3 RSP: 0018:ffffc90004667628 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff815c06c1 RDI: fffff520008cceb7 RBP: 0000000000000000 R08: ffff88808f87a100 R09: fffffbfff180e578 R10: fffffbfff180e577 R11: ffffffff8c072bbf R12: ffff88809fca7004 R13: 00000000ffff8801 R14: dffffc0000000000 R15: ffff88809fca7000 refcount_add_not_zero include/linux/refcount.h:165 [inline] refcount_inc_not_zero include/linux/refcount.h:211 [inline] maybe_get_net include/net/net_namespace.h:252 [inline] tcf_exts_get_net include/net/pkt_cls.h:227 [inline] route4_destroy+0x534/0x800 net/sched/cls_route.c:298 tcf_proto_destroy+0x6e/0x310 net/sched/cls_api.c:296 tcf_proto_put+0x8c/0xc0 net/sched/cls_api.c:308 tcf_chain_flush+0x266/0x390 net/sched/cls_api.c:600 tcf_block_flush_all_chains net/sched/cls_api.c:1052 [inline] __tcf_block_put+0x1a4/0x540 net/sched/cls_api.c:1214 tcf_block_put_ext net/sched/cls_api.c:1414 [inline] tcf_block_put+0xb3/0x100 net/sched/cls_api.c:1429 hfsc_destroy_qdisc+0xe0/0x280 net/sched/sch_hfsc.c:1501 qdisc_destroy+0x118/0x690 net/sched/sch_generic.c:958 qdisc_put+0xcd/0xe0 net/sched/sch_generic.c:985 dev_shutdown+0x2b5/0x486 net/sched/sch_generic.c:1311 rollback_registered_many+0x603/0xe70 net/core/dev.c:8803 unregister_netdevice_many.part.0+0x16/0x1e0 net/core/dev.c:9966 unregister_netdevice_many net/core/dev.c:9965 [inline] default_device_exit_batch+0x311/0x3d0 net/core/dev.c:10442 ops_exit_list.isra.0+0x103/0x150 net/core/net_namespace.c:175 cleanup_net+0x511/0xa50 net/core/net_namespace.c:589 process_one_work+0x94b/0x1690 kernel/workqueue.c:2266 worker_thread+0x96/0xe20 kernel/workqueue.c:2412 kthread+0x357/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Kernel Offset: disabled Rebooting in 86400 seconds.. --- This bug is generated by a bot. 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