From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugtrack@alsa-project.org Subject: [ALSA - driver 0002070]: Hard lockup from aplay with low buffersizes on Tascam us-122 (snd_usb_usx2y) Date: Tue, 2 May 2006 21:14:26 +0200 Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Return-path: Received: from bugtrack.alsa-project.org (gate.perex.cz [85.132.177.35]) by alsa.jcu.cz (ALSA's E-mail Delivery System) with ESMTP id 2650019F for ; Tue, 2 May 2006 21:14:27 +0200 (MEST) 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: alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org A NOTE has been added to this issue. ====================================================================== ====================================================================== Reported By: jaime Assigned To: karsten ====================================================================== Project: ALSA - driver Issue ID: 2070 Category: USB - usb-usx2y Reproducibility: always Severity: crash Priority: normal Status: assigned Distribution: Gentoo ~x86 Kernel Version: 2.6.17-rc1 ====================================================================== Date Submitted: 04-25-2006 23:07 CEST Last Modified: 05-02-2006 21:14 CEST ====================================================================== Summary: Hard lockup from aplay with low buffersizes on Tascam us-122 (snd_usb_usx2y) Description: Hi. Here's the original I'm playing (440Hz sine wave): www.carbon.eclipse.co.uk/origSine.wav aplay --buffer-size=1024 origSine.wav sounds great: www.carbon.eclipse.co.uk/aplay1024.wav aplay --buffer-size=512 origSine.wav sounds bad: www.carbon.eclipse.co.uk/aplay512.wav aplay --buffer-size=256 origSine.wav sounds very bad: www.carbon.eclipse.co.uk/aplay256.wav aplay --buffer-size=128 origSine.wav gives only a very short click, and then locks up the machine completely: www.carbon.eclipse.co.uk/aplay128.wav I've tried this using different usb cards/controllers, and I get the same problem, so I think it is an alsa driver problem. Thank you for any help you can offer. ====================================================================== ---------------------------------------------------------------------- karsten - 04-30-06 21:12 ---------------------------------------------------------------------- ah, glad to read nrpacks=1 helps. I guess its not necessary to further debug this: the driver should be changed to only allow buffersizes >= 1024, when nrpacks!=1. (nrpacks!=1 is a means to make things work in slowish pc anyhow.) In the meantime, just modify your /etc/modprobe.conf so nrpacks=1 will always be applied. Thanks, Karsten ---------------------------------------------------------------------- jaime - 05-02-06 21:14 ---------------------------------------------------------------------- Hi Karsten. I know that you said that it's not worth debugging this, but I'm still trying to get a stack trace, just to find out what's causing the lockup. I'm managed to get a serial console working on another machine, and using the nmi_watchdog, I get the following out 5 seconds after I start aplay: BUG: NMI Watchdog detected LOCKUP on CPU0, eip c03393a4, registers: Modules linked in: snd_usb_usx2y snd_usb_lib snd_rawmidi snd_seq_device ..]�.u�.}��...0. That's all I get, and that was after I'd set the console logging level to 8 (using /proc/sys/kernel/printk). I've read a lot in the last few days, but I'm not sure what is the best tool to use, to get that elusive stack trace. What do you recommend? Thanks Issue History Date Modified Username Field Change ====================================================================== 04-25-06 23:07 jaime New Issue 04-25-06 23:07 jaime Distribution => Gentoo ~x86 04-25-06 23:07 jaime Kernel Version => 2.6.17-rc1 04-26-06 16:23 jaime Note Added: 0009514 04-26-06 23:19 karsten Note Added: 0009526 04-26-06 23:29 karsten Note Added: 0009527 04-26-06 23:31 karsten Note Edited: 0009527 04-30-06 19:35 jaime Note Added: 0009550 04-30-06 21:12 karsten Note Added: 0009551 05-02-06 21:14 jaime Note Added: 0009578 ====================================================================== ------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642