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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6EC34C433F5 for ; Tue, 16 Nov 2021 09:23:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 390D761C14 for ; Tue, 16 Nov 2021 09:23:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233093AbhKPJ0W (ORCPT ); Tue, 16 Nov 2021 04:26:22 -0500 Received: from mail-il1-f197.google.com ([209.85.166.197]:49706 "EHLO mail-il1-f197.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232975AbhKPJ0Q (ORCPT ); Tue, 16 Nov 2021 04:26:16 -0500 Received: by mail-il1-f197.google.com with SMTP id w6-20020a056e021a6600b0027553e5c4e9so12344996ilv.16 for ; Tue, 16 Nov 2021 01:23:20 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=Y7UlQEH6EdHJbA9CWN3d6nE2lWq3kJRX9/GAEL2WvUA=; b=ozJ9IiOftYLc11EnJ1F9vb+w7IdYuILDD3KXmbez05ZSqvR4ezDW7MbqFTlZlVKkEZ 1l3Cl53Jf5HQrzfpbHeRwkAE+I+JCpAex3/73RkgZLDLeoUaD9dU+cZZcn/KQp+FKEyw tSTWGzLHeFGzRsdn8IWWNKp2sjCRyRYjsgLXzegZnc5jkmmse93L6c4ykg2Gz8v+2mja Sc78Q2+n3eZsZtAiI6hWXm0TIxFWn90BdDVa2MXFuDgExKGWRQvHZQRaAKnyHq1fKOT5 dMwsaiw2oU0DRfrwO3WlgBP97TwrY5L0EByuDuYJuJeeNfk/KSDjdhn9Y5Be6kFqG0H+ XxYA== X-Gm-Message-State: AOAM531hW430aITfAbPVddbuGJcUGyT2AVSo4k4n/B6ujEcXyNSQlpLB oz5rOKNebesgXjWOy8FREDaI96Uk/cjSOC0dcGPiYL3d7Wor X-Google-Smtp-Source: ABdhPJxakJsMDMwcVxWEwcQ8+Leib/kyutWGFWgbYb+GtTRCg4Mi5Dj7l0kp9aJnbqgYYoTsUrzT7NxhERT2cFTddShLbx48ibfn MIME-Version: 1.0 X-Received: by 2002:a6b:7705:: with SMTP id n5mr3878792iom.173.1637054599679; Tue, 16 Nov 2021 01:23:19 -0800 (PST) Date: Tue, 16 Nov 2021 01:23:19 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000e4810705d0e479d5@google.com> Subject: [syzbot] WARNING: refcount bug in __linkwatch_run_queue From: syzbot To: davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, w@1wt.eu 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: fa55b7dcdc43 Linux 5.16-rc1 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=109339e1b00000 kernel config: https://syzkaller.appspot.com/x/.config?x=6c3ab72998e7f1a4 dashboard link: https://syzkaller.appspot.com/bug?extid=6f8ddb9f2ff4adf065cb compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.2 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+6f8ddb9f2ff4adf065cb@syzkaller.appspotmail.com ------------[ cut here ]------------ refcount_t: decrement hit 0; leaking memory. WARNING: CPU: 1 PID: 26140 at lib/refcount.c:31 refcount_warn_saturate+0x17c/0x1a0 lib/refcount.c:31 Modules linked in: CPU: 1 PID: 26140 Comm: kworker/1:26 Not tainted 5.16.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events linkwatch_event RIP: 0010:refcount_warn_saturate+0x17c/0x1a0 lib/refcount.c:31 Code: f4 8a 31 c0 e8 f5 45 38 fd 0f 0b e9 64 ff ff ff e8 49 6a 6e fd c6 05 06 40 f5 09 01 48 c7 c7 80 fe f4 8a 31 c0 e8 d4 45 38 fd <0f> 0b e9 43 ff ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c a2 fe ff RSP: 0018:ffffc90003537b68 EFLAGS: 00010246 RAX: 26aa35cdf4075e00 RBX: 0000000000000004 RCX: ffff88803baaba00 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: 0000000000000004 R08: ffffffff8169fb82 R09: ffffed10173667b1 R10: ffffed10173667b1 R11: 0000000000000000 R12: ffff88807ccac000 R13: 1ffff1100f9958b7 R14: 1ffff1100f9958b8 R15: ffff88807ccac5b8 FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f217b0e6740 CR3: 0000000019e96000 CR4: 00000000003526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 000000000000ff46 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: __linkwatch_run_queue+0x4f5/0x800 net/core/link_watch.c:213 linkwatch_event+0x48/0x50 net/core/link_watch.c:252 process_one_work+0x853/0x1140 kernel/workqueue.c:2298 worker_thread+0xac1/0x1320 kernel/workqueue.c:2445 kthread+0x468/0x490 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 --- 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.