Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755258Ab2K1OJI (ORCPT ); Wed, 28 Nov 2012 09:09:08 -0500 Received: from mail-pb0-f46.google.com ([209.85.160.46]:63519 "EHLO mail-pb0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755057Ab2K1OJF (ORCPT ); Wed, 28 Nov 2012 09:09:05 -0500 Date: Wed, 28 Nov 2012 06:08:59 -0800 From: Tejun Heo To: Mike Galbraith Cc: LKML Subject: Re: [patch] workqueue: exit rescuer_thread() as TASK_RUNNING Message-ID: <20121128140859.GD15971@htj.dyndns.org> References: <1354083438.4506.3.camel@marge.simpson.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1354083438.4506.3.camel@marge.simpson.net> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2205 Lines: 43 On Wed, Nov 28, 2012 at 07:17:18AM +0100, Mike Galbraith wrote: > > A rescue thread exiting TASK_INTERRUPTIBLE can lead to a task scheduling > off, never to be seen again. In the case where this occurred, an exiting > thread hit reiserfs homebrew conditional resched while holding a mutex, > bringing the box to it's knees. > > PID: 18105 TASK: ffff8807fd412180 CPU: 5 COMMAND: "kdmflush" > #0 [ffff8808157e7670] schedule at ffffffff8143f489 > #1 [ffff8808157e77b8] reiserfs_get_block at ffffffffa038ab2d [reiserfs] > #2 [ffff8808157e79a8] __block_write_begin at ffffffff8117fb14 > #3 [ffff8808157e7a98] reiserfs_write_begin at ffffffffa0388695 [reiserfs] > #4 [ffff8808157e7ad8] generic_perform_write at ffffffff810ee9e2 > #5 [ffff8808157e7b58] generic_file_buffered_write at ffffffff810eeb41 > #6 [ffff8808157e7ba8] __generic_file_aio_write at ffffffff810f1a3a > #7 [ffff8808157e7c58] generic_file_aio_write at ffffffff810f1c88 > #8 [ffff8808157e7cc8] do_sync_write at ffffffff8114f850 > #9 [ffff8808157e7dd8] do_acct_process at ffffffff810a268f > #10 [ffff8808157e7e78] acct_process at ffffffff810a27ba > #11 [ffff8808157e7e98] do_exit at ffffffff8105e29a > #12 [ffff8808157e7ee8] kthread at ffffffff8107afee > #13 [ffff8808157e7f48] kernel_thread_helper at ffffffff8144a5c4 > [exception RIP: kernel_thread_helper] > RIP: ffffffff8144a5c0 RSP: ffff8808157e7f58 RFLAGS: 00000202 > RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 > RDX: 0000000000000000 RSI: ffffffff8107af60 RDI: ffff8803ee491d18 > RBP: 0000000000000000 R8: 0000000000000000 R9: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 > R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 > ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018 > > Signed-off-by: Mike Galbraith > Cc: stable@vger.kernel.org Applied to wq/for-3.8. Thanks! -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/