From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ingo Molnar Subject: Re: Re: 2.6.15-rt18, alsa sequencer, rosegarden -> alsa hangs Date: Wed, 8 Mar 2006 12:48:47 +0100 Message-ID: <20060308114847.GA20591@elte.hu> References: <1141769000.5565.21.camel@cmn3.stanford.edu> <20060307220628.GA27536@elte.hu> <1141800836.6150.3.camel@cmn3.stanford.edu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: Sender: alsa-devel-admin@lists.sourceforge.net Errors-To: alsa-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Takashi Iwai Cc: Fernando Lopez-Lezcano , linux-kernel@vger.kernel.org, alsa-devel@lists.sourceforge.net, cc@ccrma.Stanford.EDU List-Id: alsa-devel@alsa-project.org * Takashi Iwai wrote: > > > could you get a tasklist-dump? It's either SysRq-T, or: > > > > > > echo t > /proc/sysrq-trigger > > > > > > that should dump all tasks and their backtraces - including the hung > > > rosegardensequencer task. > > > > I'll try to do that tomorrow. > > That'll be helpful. A deadlocked mutex could be easily found by a > backtrace. furthermore, in the -rt kernel (if PREEMPT_RT and DEBUG_DEADLOCKS is enabled), all locks will also be printed, and their owners, and the site where they got acquired, etc. A deadlocked mutex/semaphore should in fact be detected by the kernel, if those options are enabled. Ingo ------------------------------------------------------- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642