From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757071AbXHESWK (ORCPT ); Sun, 5 Aug 2007 14:22:10 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752176AbXHESV5 (ORCPT ); Sun, 5 Aug 2007 14:21:57 -0400 Received: from rv-out-0910.google.com ([209.85.198.188]:62193 "EHLO rv-out-0910.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752099AbXHESV4 (ORCPT ); Sun, 5 Aug 2007 14:21:56 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=googlemail.com; s=beta; h=received:message-id:date:from:to:subject:mime-version:content-type:content-transfer-encoding:content-disposition; b=o/t/w3UnCZwMHX1ez5nnwmiC72dWYOXr1Agy9XY8Yoi56u9AIX4j+49sFlh2XltG+f4vLyaTqNQMmrK2CChxt75Q2QNnY9udOKoUx6QfvKnu+fYOWp34Cj+hlM6UULmUX/yYbzGOLQ4MifBiOWvjzKkR4xg8R0f3auJNCZGDVd4= Message-ID: <3aadbf9e0708051121m3ce8e044g104f58c17466eb60@mail.gmail.com> Date: Mon, 6 Aug 2007 02:21:55 +0800 From: "Othello Reversi" To: linux-kernel@vger.kernel.org Subject: Calling add_disk() from a work_queue item MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi List, I would like to know why calling add_disk() from a kernel thread which is running from a work_queue would cause the work item to block with the "D" (disk wait) state at best under kernel 2.6.17 and cause a hard-lockup on kernel 2.6.22.1? If I recall correctly, work items running on the work_queue are allowed to sleep, and add_disk() is known to sleep. Did I miss out some details such as a lock I have to acquire? Hope to hear a reply soon. Regards, Othello PS: Would like to be CC'ed comments and replies.