From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751713AbWAKUrk (ORCPT ); Wed, 11 Jan 2006 15:47:40 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751729AbWAKUrk (ORCPT ); Wed, 11 Jan 2006 15:47:40 -0500 Received: from ms-smtp-02.nyroc.rr.com ([24.24.2.56]:37067 "EHLO ms-smtp-02.nyroc.rr.com") by vger.kernel.org with ESMTP id S1751694AbWAKUrk (ORCPT ); Wed, 11 Jan 2006 15:47:40 -0500 Subject: 2.6.15-rt4-sr1 From: Steven Rostedt To: Ingo Molnar Cc: George Anzinger , john stultz , LKML , Thomas Gleixner Content-Type: text/plain Date: Wed, 11 Jan 2006 15:47:11 -0500 Message-Id: <1137012431.6197.117.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.2.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org I've just uploaded my new maintenance release. fixes: - light soft lockup - currently it doesn't detect the light soft lockups because the counter was being reset in the wrong place. Not sure if this was done earlier with some other issue. But I needed this fix to get the low priority lockup to be detected. - posix_timers deadlock - There's a loop in the posix_timeres code that is entered if the current process is a higher priority than the softirqd thread, and it spins until the softirqd thread is finished. But since the thread is of a higher priority than the softirqd, it deadlocks. - read_trylock_rt - added this for cases that have a loop on read_trylock. Since in RT a read lock is a mutex, a read_trylock will fail even if the owner has it only for reading. But since the reads are not protected with irqsaves, this can deadlock when a high priority process preempts the owner of the lock and spins till it's released. (this was seen in signal.c: send_group_sigqueue, there may be others) Still at the normal location: http://home.stny.rr.com/rostedt/patches/patch-2.6.15-rt4-sr1 Here is the program that showed all these nice deadlocks ;) http://www.kihontech.com/tests/rt/timer_stress.c (Run with -P to get the posix deadlocks) -- Steve