From mboxrd@z Thu Jan 1 00:00:00 1970 From: John Kacur Subject: [BUG-REPORT][PREEMPT-RT] 2.6.33.1-rt11 triggers DEBUG_LOCKS_WARN_ON(!p->hardirqs_enabled), in a 32-bit kvm session Date: Fri, 26 Mar 2010 13:02:22 +0100 Message-ID: <520f0cf11003260502o5ecb23adpe69f6eb465142821@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Cc: LKML , RT To: Thomas Gleixner Return-path: Received: from mail-fx0-f223.google.com ([209.85.220.223]:45383 "EHLO mail-fx0-f223.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752673Ab0CZMCY (ORCPT ); Fri, 26 Mar 2010 08:02:24 -0400 Sender: linux-rt-users-owner@vger.kernel.org List-ID: During boot-up of 2.6.33.1-rt11 in a 32-bit qemu-kvm machine, The following warning is reliably (every time) triggered. ------------[ cut here ]------------ WARNING: at /home/jkacur/jk-2.6/kernel/fork.c:1065 copy_process+0x299/0x160f() Hardware name: Modules linked in: Pid: 64, comm: khelper Not tainted 2.6.33.1-rt11 #1 Call Trace: [] warn_slowpath_common+0x83/0x9a [] warn_slowpath_null+0x12/0x15 [] copy_process+0x299/0x160f [] do_fork+0x235/0x4e2 [] ? register_lock_class+0x17/0x22d [] ? mark_lock+0x1e/0x1c0 [] ? ____call_usermodehelper+0x0/0x138 [] kernel_thread+0x79/0x81 [] ? ____call_usermodehelper+0x0/0x138 [] ? kernel_thread_helper+0x0/0x10 [] __call_usermodehelper+0x75/0xa0 [] worker_thread+0x1f6/0x2fb [] ? worker_thread+0x1b4/0x2fb [] ? __call_usermodehelper+0x0/0xa0 [] ? autoremove_wake_function+0x0/0x46 [] kthread+0x6b/0x74 [] ? worker_thread+0x0/0x2fb [] ? kthread+0x0/0x74 [] ? kthread+0x0/0x74 [] kernel_thread_helper+0x6/0x10 ---[ end trace a22d306b065d4a66 ]--- I am happy to provide more information to help debug this. Thanks