Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261326AbVDDSlm (ORCPT ); Mon, 4 Apr 2005 14:41:42 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261329AbVDDSll (ORCPT ); Mon, 4 Apr 2005 14:41:41 -0400 Received: from gate.perex.cz ([82.113.61.162]:61401 "EHLO mail.perex.cz") by vger.kernel.org with ESMTP id S261326AbVDDSjk (ORCPT ); Mon, 4 Apr 2005 14:39:40 -0400 Date: Mon, 4 Apr 2005 20:39:37 +0200 (CEST) From: Jaroslav Kysela X-X-Sender: perex@pnote.perex-int.cz To: Adrian Bunk Cc: Daniel Drake , David Ford , linux-kernel mailing list , ALSA development Subject: Re: ALSA bugs with 2.6.12-rc1 In-Reply-To: <20050404173453.GB4087@stusta.de> Message-ID: References: <42515358.7020101@blue-labs.org> <4251749B.5060603@gentoo.org> <20050404173453.GB4087@stusta.de> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1462 Lines: 39 On Mon, 4 Apr 2005, Adrian Bunk wrote: > On Mon, Apr 04, 2005 at 06:08:43PM +0100, Daniel Drake wrote: > > David Ford wrote: > > > It seems that 2.6.12-rc1 introduced an ALSA bug generating an oops for a > > > null pointer. > > > > > > codec_semaphore: semaphore is not ready [0x1][0x300300] > > > codec_read 0: semaphore is not ready for register 0x2c > > > Unable to handle kernel NULL pointer dereference at virtual address > > > 00000000 > > > > > > This happens on multiple machines, 32b and 64bit. I'll be happy to > > > provide further information if needed. > > > > This only happens when you mismatch your kernel and alsa-lib versions, e.g. > > running alsa-lib-1.0.9-rc2 with alsa-1.0.8 in-kernel drivers, or possibly > > vice-versa. > > Are you saying the userspace interface of the ALSA kernel drivers has > incompatible changes between minor versions of ALSA? > > If this is true, that's a serious bug. Nope, but newer alsa-lib use an ALSA timer API feature which was not well debugged. This oops should be fixed in 2.6.12-rc2 and older libraries will work with newer kernels as well. Jaroslav ----- Jaroslav Kysela Linux Kernel Sound Maintainer ALSA Project, SUSE Labs - 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/