Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261669AbVCYPAB (ORCPT ); Fri, 25 Mar 2005 10:00:01 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261668AbVCYPAB (ORCPT ); Fri, 25 Mar 2005 10:00:01 -0500 Received: from mx2.elte.hu ([157.181.151.9]:59817 "EHLO mx2.elte.hu") by vger.kernel.org with ESMTP id S261669AbVCYO7l (ORCPT ); Fri, 25 Mar 2005 09:59:41 -0500 Date: Fri, 25 Mar 2005 15:59:08 +0100 From: Ingo Molnar To: linux-kernel@vger.kernel.org Cc: "Paul E. McKenney" Subject: [patch] Real-Time Preemption, -RT-2.6.12-rc1-V0.7.41-10 Message-ID: <20050325145908.GA7146@elte.hu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.4.2.1i X-ELTE-SpamVersion: MailScanner 4.31.6-itk1 (ELTE 1.2) SpamAssassin 2.63 ClamAV 0.73 X-ELTE-VirusStatus: clean X-ELTE-SpamCheck: no X-ELTE-SpamCheck-Details: score=-4.9, required 5.9, autolearn=not spam, BAYES_00 -4.90 X-ELTE-SpamLevel: X-ELTE-SpamScore: -4 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1964 Lines: 48 i have released the -V0.7.41-10 Real-Time Preemption patch, which can be downloaded from the usual place: http://redhat.com/~mingo/realtime-preempt/ this release fixes two bugs: - one affecting SMP systems & RCU (the missing smp_mb()s) - the other one in net/xfrm/xfrm_policy.c, affecting systems where network interfaces (or pseudo-interfaces) are frequently created/destroyed i've also added a new debugging feature which is activated if RT_DEADLOCK_DETECT is enabled: the checking of active locks in freed memory. This catches a dangerous category of bugs which the upstream kernel can silently ignore (because there locks are quite 'passive'), while the -RT kernel will often go down in flames sometime later (it has lists within the lock, etc.). This mechanism found the xfrm_policy.c bug: BUG: events/0/4, active lock [e94a8cdc(e94a8cd0-e94a90dc)] freed! [] dump_stack+0x1e/0x20 (20) [] check_no_locks_freed+0x158/0x210 (60) [] kfree+0x59/0x15a (48) [] xfrm_policy_gc_task+0x6f/0x7e (28) [] worker_thread+0x1c1/0x26c (132) [] kthread+0x95/0xbd (48) [] kernel_thread_helper+0x5/0xb (1039269908) so i'd expect more such bugs to be found. If you had stability problems under PREEMPT_RT (hangs, crashes), please enable RT_DEADLOCK_DETECT and try to reproduce the problem and send me the resulting log messages. to create a -V0.7.41-10 tree from scratch, the patching order is: http://kernel.org/pub/linux/kernel/v2.6/linux-2.6.11.tar.bz2 http://kernel.org/pub/linux/kernel/v2.6/testing/patch-2.6.12-rc1.bz2 http://redhat.com/~mingo/realtime-preempt/realtime-preempt-2.6.12-rc1-V0.7.41-10 Ingo - 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/