From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail115-100.sinamail.sina.com.cn (mail115-100.sinamail.sina.com.cn [218.30.115.100]) (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 401DF1891BB for ; Fri, 27 Sep 2024 11:42:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=218.30.115.100 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727437343; cv=none; b=GE1i8vc6MGg/Ydq++ppU6jmGRkF7IguU198f48FFbZzjAII8yM/2gwGkTI7HoB2WU4A24ELCD2EFYs5pgbZRoqRzHTIyKFtqQ0e9TiKv/7zm5hWxGEy5MVxwhhajpDy6uECWcHVZt/TZWThfcS1tWIHq9gtVynOXe9zbic3Tmq8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727437343; c=relaxed/simple; bh=2/TM2NHM2Z6JbDF6sxIrQU/Yg2Y3AlAVhKkUXPDJ4+w=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=oLMq0qS34B4mmB6Epk4RQ6v1Z1FhACQ5pK/c6ptI5RyXWtg3XLeJXyYjExk3X02drglMyZy6n81F6STlZSD6YnVUQ5zm0EiAAA7O43WSO5HmwFHulHU15s/7Qo+lDh88SaUP7K3uPUrJEyekmhuulfopzaTTqU3gmygXljX95kw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sina.com; spf=pass smtp.mailfrom=sina.com; arc=none smtp.client-ip=218.30.115.100 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sina.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sina.com X-SMAIL-HELO: localhost.localdomain Received: from unknown (HELO localhost.localdomain)([113.118.71.54]) by sina.com (10.185.250.23) with ESMTP id 66F69A0D000026DB; Fri, 27 Sep 2024 19:42:08 +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: 6840358913239 X-SMAIL-UIID: A2F331F45F294C8C95E71D6C31C39589-20240927-194208-1 From: Hillf Danton To: Eric Dumazet Cc: syzbot , linux-kernel@vger.kernel.org, Tetsuo Handa , Boqun Feng , Linus Torvalds , netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [net?] INFO: task hung in new_device_store (5) Date: Fri, 27 Sep 2024 19:41:58 +0800 Message-Id: <20240927114158.1190-1-hdanton@sina.com> In-Reply-To: References: <66f5a0ca.050a0220.46d20.0002.GAE@google.com> <20240927110422.1084-1-hdanton@sina.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On Fri, 27 Sep 2024 13:24:54 +0200 Eric Dumazet > I suggest you look at why we have to use rtnl_trylock() > > If you know better, please send patches to remove all instances. No patch is needed before you show us deadlock. I suspect you could spot a case where lockdep fails to report deadlock.