From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2993050AbXDTLdt (ORCPT ); Fri, 20 Apr 2007 07:33:49 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S2993034AbXDTLdt (ORCPT ); Fri, 20 Apr 2007 07:33:49 -0400 Received: from 85-126-107-146.static.sdsl-line.inode.at ([85.126.107.146]:3776 "EHLO mail.contec.at" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2993006AbXDTLds (ORCPT ); Fri, 20 Apr 2007 07:33:48 -0400 X-Greylist: delayed 1685 seconds by postgrey-1.27 at vger.kernel.org; Fri, 20 Apr 2007 07:33:47 EDT From: Manfred Gruber To: linux-kernel@vger.kernel.org Subject: preempt_rt bug or warn on arm v4t Date: Fri, 20 Apr 2007 13:06:08 +0200 User-Agent: KMail/1.6.2 MIME-Version: 1.0 Content-Disposition: inline Cc: jan.altenberg@linutronix.de, tglx@linutronix.de, mingo@elte.hu Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <200704201306.08066.m.gruber@tirol.com> X-OriginalArrivalTime: 20 Apr 2007 11:05:33.0843 (UTC) FILETIME=[D1239E30:01C7833B] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi ! I am using 2.6.21-rc7 with Preempt_rt Patch 2.6.20-rc6-rt0 on ep93xx. This oops does not trigger in preempt_rt patch is applied. On startup i get following oops when preemption is none. Mount-cache hash table entries: 512 CPU: Testing write buffer coherency: ok BUG: at kernel/sched.c:4285 __schedule() [] (dump_stack+0x0/0x14) from [] (__schedule+0x844/0x8e0) [] (__schedule+0x0/0x8e0) from [] (schedule+0xd0/0x118) [] (schedule+0x0/0x118) from [] (wait_for_completion+0x94/0xf0) r4 = C042DE88 [] (wait_for_completion+0x0/0xf0) from [] (keventd_create_kthread+0x3c/0x74) r7 = 00000000 r6 = 00000002 r5 = C042DED4 r4 = C042DF18 [] (keventd_create_kthread+0x0/0x74) from [] (kthread_create+0x80/0xc8) r6 = C001C320 r5 = C042DED4 r4 = 00000000 [] (kthread_create+0x0/0xc8) from [] (posix_cpu_thread_call+0x40/0xb8) r3 = 00000000 r2 = C0352BD0 r5 = 00000000 r4 = 00000000 [] (posix_cpu_thread_call+0x0/0xb8) from [] (posix_cpu_thread_init+0x24/0x40) r5 = 00000000 r4 = C03A7F74 [] (posix_cpu_thread_init+0x0/0x40) from [] (init+0x38/0x30c) r4 = 00000000 [] (init+0x0/0x30c) from [] (do_exit+0x0/0x80c) NET: Registered protocol family 16 ep93xx: PLL1 running at 400 MHz, PLL2 at 192 MHz ep93xx: FCLK 200 MHz, HCLK 100 MHz, PCLK 50 MHz SCSI subsystem initialized usbcore: registered new interface driver usbfs If I enable full preemp_rt i get a warn: irq event stamp: 0 hardirqs last enabled at (0): [<00000000>] __init_begin+0x3fff8000/0x30 hardirqs last disabled at (0): [] copy_process+0x344/0x124c softirqs last enabled at (0): [] copy_process+0x344/0x124c softirqs last disabled at (0): [<00000000>] __init_begin+0x3fff8000/0x30 BUG: at kernel/sched.c:4288 __schedule() [] (dump_stack+0x0/0x28) from [] (__schedule+0xa04/0xab4) [] (__schedule+0x0/0xab4) from [] (schedule+0xdc/0x128) [] (schedule+0x0/0x128) from [] (kthread+0xcc/0x12c) r4 = C0B72000 [] (kthread+0x0/0x12c) from [] (do_exit+0x0/0x814) r7 = 00000000 r6 = 00000000 r5 = 00000000 r4 = 00000000 --------------------------- | preempt count: 00000000 ] | 0-level deep critical section nesting: Does someone has an idea what is wrong ? The configs can be found here: https://dev.contec.at/dev/micro/micro9/LINUX/trunk/kernel/linux-2.6-config/ My quilt queue can be found here: https://dev.contec.at/dev/micro/micro9/LINUX/trunk/kernel/linux-2.6/patches/ thanks regards manfred