From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail3-167.sinamail.sina.com.cn (mail3-167.sinamail.sina.com.cn [202.108.3.167]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BB7EB1B87C9 for ; Sun, 16 Aug 2026 01:49:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=202.108.3.167 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786845000; cv=none; b=Zj5kae51tPoo9pmpM/ydqpp/QIcSvku76YymNlcFUxxE5pAWMLo8YmCut8c6apTEq0av93y1WCg5QXx36ALs1kGAtqx87aLXk5h89EEhwrmPkNyVUMDD6/HsOKP6ajZWfG0t/B1i0AmP/Z1HhFGGPCb4EQlSofcxGofgvdoxg2k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786845000; c=relaxed/simple; bh=TWlS5zFIu289frGRky4GN2nfYmKi3GQnzV49j8uW/fQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=n8T4GnLUxBm7Bt6X4GufIpjQmqLtGxgDy0RmmheGbimAYfBkNNgdr/ZvylC/QdjBiAx5Zmv1BNskib16nNh11rEvHnzHhVDTHNO7OSdrMqxznxoFctCuHjELhXMXCYBIteXNZBBCpZXSpB6jg+fE2tCkQSar1O/Kne9htZ+Z1Us= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sina.com; spf=pass smtp.mailfrom=sina.com; dkim=pass (1024-bit key) header.d=sina.com header.i=@sina.com header.b=Yjhhcivl; arc=none smtp.client-ip=202.108.3.167 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sina.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sina.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=sina.com header.i=@sina.com header.b="Yjhhcivl" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sina.com; s=201208; t=1786844996; bh=I9ZB69rxpG5yGVVd1SwS1so5aS1ZT3ZSsmnetbYFDSQ=; h=From:Subject:Date:Message-ID; b=YjhhcivlzioUhq0QiZ8LBU+VjQ0wy/HJasjAORtHPSdA0tWZ+3ojkilLoOFUJDFCZ sikPBUTg8ZeX7Li8BCigj2Y2XTdNCd84wluT6QJgdxWw0kYPi/lsCqDmYeshy3TS1S Mu11WeDtExkKg7IquEHYS/HyXqdTK3pvL9x5XWRI= X-SMAIL-HELO: localhost.localdomain Received: from unknown (HELO localhost.localdomain)([221.216.154.155]) by sina.com (10.54.253.33) with ESMTP id 6A81171900005780; Sun, 16 Aug 2026 09:49:16 +0800 (CST) X-Sender: hdanton@sina.com X-Auth-ID: hdanton@sina.com Authentication-Results: sina.com; spf=none smtp.mailfrom=hdanton@sina.com; dkim=none header.i=none; dmarc=none action=none header.from=hdanton@sina.com X-SMAIL-MID: 1283266685140 X-SMAIL-UIID: CC96787B58FF46BCBA5FADAB203329A0-20260816-094916-1 From: Hillf Danton To: Hillf Danton Cc: Eric Dumazet , Deepanshu Kartikey , linux-block@vger.kernel.org, nbd@other.debian.org, linux-kernel@vger.kernel.org, syzbot+6b85d1e39a5b8ed9a954@syzkaller.appspotmail.com Subject: Re: [PATCH] nbd: don't warn when reclassifying a busy socket lock Date: Sun, 16 Aug 2026 09:49:04 +0800 Message-ID: <20260816014906.1149-1-hdanton@sina.com> In-Reply-To: <20260802081922.840-1-hdanton@sina.com> References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On Sun, 2 Aug 2026 16:19:20 +0800 Hillf Danton wrote: >On Tue, 28 Jul 2026 12:53:37 +0800 Hillf Danton wrote: >>On Mon, 20 Jul 2026 10:39:17 +0800 Hillf Danton wrote: >>>On Mon, 20 Jul 2026 10:23:43 +0800 Hillf Danton wrote: >>>>On Sun, Jun 28, 2026 at 10:29 PM Hillf Danton wrote: >>>>> For archive purpose, syzbot report [1] where udp was not invovled defies >>>>> what is fixed in d532cddb6c60 ("nbd: Reclassify sockets to avoid lockdep >>>>> circular dependency") -- "Since the UDP socket and the NBD TCP/TLS socket >>>>> are different, this is a false positive." >>>>> >>>>> >>>>> [1] Subject: [syzbot] [net?] possible deadlock in inet_shutdown (3) >>>>> https://lore.kernel.org/lkml/69c37e6a.a70a0220.234938.0045.GAE@google.com/ >>>>> >>>>For archive purpose, syzbot report [2] shows deadlock without either udp or >>>>tcp invovled. But it sounds false positive because kernfs node is removed >>>>while the filesystem is filling super block. >>>> >>>>[2] Subject: [syzbot] [kernfs?] possible deadlock in kernfs_remove_by_name_ns (2) >>>>https://lore.kernel.org/lkml/6a5ca0b7.f1649fcc.2a4208.03f3.GAE@google.com/ >>>> >>>For archive purpose, syzbot reports [3,4] show deadlock without either udp or >>>tcp invovled. >>> >>>[3] Subject: [syzbot] [kernfs?] possible deadlock in kernfs_iop_permission (2) >>>https://lore.kernel.org/lkml/6a5d14b8.42649fcc.6186.0078.GAE@google.com/ >>> >>>[4] Subject: [syzbot] [kernel?] possible deadlock in netif_reset_xps_queues_gt (3) >>>https://lore.kernel.org/lkml/6a5d14b9.42649fcc.6186.0079.GAE@google.com/ >>> >>For archive purpose, syzbot report [5] shows deadlock without lock_sock invovled. >> >>[5] Subject: [syzbot] [pm?] possible deadlock in thermal_zone_device_set_mode >>https://lore.kernel.org/lkml/6a676313.073198cf.94f0f.0033.GAE@google.com/ >> >For archive purpose, syzbot report [6] shows deadlock without nbd invovled. > >[6] Subject: [syzbot] [block?] [cgroups?] possible deadlock in blkcg_deactivate_policy (2) >https://lore.kernel.org/lkml/6a6e8a06.6ce73036.24301b.0015.GAE@google.com/ > For archive purpose, syzbot report [7] shows deadlock without socket invovled. [7] Subject: [syzbot] [block?] [cgroups?] possible deadlock in blkg_conf_prep https://lore.kernel.org/lkml/6a807bfd.f7a79266.2f965f.0008.GAE@google.com/ BTW do you still have any interest/minute fixing it Eric?