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 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 BA969C07E95 for ; Wed, 7 Jul 2021 21:25:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 960C1619CB for ; Wed, 7 Jul 2021 21:25:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232782AbhGGV2F (ORCPT ); Wed, 7 Jul 2021 17:28:05 -0400 Received: from mail-il1-f199.google.com ([209.85.166.199]:54040 "EHLO mail-il1-f199.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232603AbhGGV2E (ORCPT ); Wed, 7 Jul 2021 17:28:04 -0400 Received: by mail-il1-f199.google.com with SMTP id j6-20020a926e060000b02901f2f7ba704aso2211779ilc.20 for ; Wed, 07 Jul 2021 14:25:23 -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=cxeYjJOcGKZ3Ilg0y/wGG0iG5oaNEsfRZrcenrSywx0=; b=rAfUcfPRJ7TLWAlgh3Xvvbcen+c2XmfoIAcvqUrce/gT5LkXF02mnIEOzalmdywR2B Tp9bx0auORaaN8s7qLM9i0Tyo2IUkMnqEKhmOTiEcFcQAiMk30uLx1+lzr26b92YZItF 0eLlFy7Nqi32j4X8ZIdEXFdkw9fNBnFI9mnl3/Sp2amcek27oY6DirtyxoSm7dCO/Dfq bRssYBMXU15WTgEWlf94B+4oz6zxk2Ph0R72J1eh5YAPJ171mrj70PWld4Cmx8n9Tnoo doubnfc3qnqA/Rf2dffsfqyW+88FUMyvwLh/E8GfZ5GrbqmC5DvMqksi3NueU0md72rn fmpQ== X-Gm-Message-State: AOAM5320au8gDK74xp+PFJcHjlFuhqcY5a0qouQ4Adl/zQve4me/S4GJ T0I9Z4vwKNGthv/AtUfDBm8pUIMuzOqNsHSCq4eFnAyvynvL X-Google-Smtp-Source: ABdhPJweavEUv1o7B0dzQOSdY1m51vITRIW/yHxRBE7JiMl8YlM7YrxD8D+qhR45MBXDdhkY8/4etJdME0TF6n5xsUgWX3H/WGy4 MIME-Version: 1.0 X-Received: by 2002:a05:6638:1606:: with SMTP id x6mr14928032jas.98.1625693123157; Wed, 07 Jul 2021 14:25:23 -0700 (PDT) Date: Wed, 07 Jul 2021 14:25:23 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000001ea57305c68f2db6@google.com> Subject: [syzbot] WARNING in dec_ucount From: syzbot To: ebiederm@xmission.com, legion@kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: 3dbdb38e Merge branch 'for-5.14' of git://git.kernel.org/p.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1023db52300000 kernel config: https://syzkaller.appspot.com/x/.config?x=a1fcf15a09815757 dashboard link: https://syzkaller.appspot.com/bug?extid=493df5f976efd79b9b66 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+493df5f976efd79b9b66@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: CPU: 1 PID: 22176 at kernel/ucount.c:246 dec_ucount+0x10d/0x130 kernel/ucount.c:246 Modules linked in: CPU: 1 PID: 22176 Comm: kworker/u4:3 Tainted: G W 5.13.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net RIP: 0010:dec_ucount+0x10d/0x130 kernel/ucount.c:246 Code: 4d 85 e4 0f 85 52 ff ff ff e8 0f f7 26 00 48 8b 3c 24 48 83 c4 08 5b 5d 41 5c 41 5d 41 5e 41 5f e9 28 f5 ff ff e8 f3 f6 26 00 <0f> 0b eb 99 48 89 ef e8 97 b4 6c 00 e9 48 ff ff ff e8 8d b4 6c 00 RSP: 0018:ffffc90023a1fc38 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff8881626354c0 RSI: ffffffff814e933d RDI: 0000000000000003 RBP: ffff8880192d3240 R08: 0000000000000000 R09: ffff8880192d3247 R10: ffffffff814e92ad R11: 0000000000000000 R12: ffff8880192d3200 R13: dffffc0000000000 R14: 0000000000000040 R15: ffffffffffffffff FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000014a401000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: dec_net_namespaces net/core/net_namespace.c:394 [inline] cleanup_net+0x6f3/0xb10 net/core/net_namespace.c:611 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 --- 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.