From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1755155AbcBBXU3 (ORCPT <rfc822;w@1wt.eu>);
	Tue, 2 Feb 2016 18:20:29 -0500
Received: from mx2.suse.de ([195.135.220.15]:45841 "EHLO mx2.suse.de"
	rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
	id S1754839AbcBBXU1 (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
	Tue, 2 Feb 2016 18:20:27 -0500
Date: Wed, 03 Feb 2016 00:20:26 +0100
Message-ID: <s5hr3gu4s3p.wl-tiwai@suse.de>
From: Takashi Iwai <tiwai@suse.de>
To: Dmitry Vyukov <dvyukov@google.com>
Cc: alsa-devel@alsa-project.org, Jaroslav Kysela <perex@perex.cz>,
        LKML <linux-kernel@vger.kernel.org>,
        Alexander Potapenko <glider@google.com>,
        Kostya Serebryany <kcc@google.com>,
        syzkaller <syzkaller@googlegroups.com>,
        Sasha Levin <sasha.levin@oracle.com>
Subject: Re: sound: WARNING in snd_rawmidi_kernel_write1
In-Reply-To: <CACT4Y+Z-M7m0fcndzULXpeJn36vKxf6mOkGXjVLad-oVnKtxbw@mail.gmail.com>
References: <CACT4Y+YfVJ3L+q0i-4vyQVyyPD7V=OMX0PWPi29x9Bo3QaBLdw@mail.gmail.com>
	<s5hd1sgogxg.wl-tiwai@suse.de>
	<CACT4Y+Z-M7m0fcndzULXpeJn36vKxf6mOkGXjVLad-oVnKtxbw@mail.gmail.com>
User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI/1.14.6 (Maruoka)
 FLIM/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL/10.8 Emacs/24.5
 (x86_64-suse-linux-gnu) MULE/6.0 (HANACHIRUSATO)
MIME-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka")
Content-Type: text/plain; charset=US-ASCII
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Tue, 02 Feb 2016 22:25:45 +0100,
Dmitry Vyukov wrote:
> 
> On Mon, Feb 1, 2016 at 11:36 AM, Takashi Iwai <tiwai@suse.de> wrote:
> > On Mon, 01 Feb 2016 11:15:08 +0100,
> > Dmitry Vyukov wrote:
> >>
> >> Hello,
> >>
> >> The following program triggers WARNING in snd_rawmidi_kernel_write1:
> >>
> >> // autogenerated by syzkaller (http://github.com/google/syzkaller)
> >> #include <unistd.h>
> >> #include <sys/types.h>
> >> #include <sys/stat.h>
> >> #include <sys/uio.h>
> >> #include <fcntl.h>
> >>
> >> int main()
> >> {
> >>   int fd;
> >>   struct iovec iov;
> >>
> >>   fd = open("/dev/snd/midiC3D0", O_RDWR);
> >
> > What is the 3rd device?  Please show /proc/asound/cards content.
> 
> Missed this question. Here is it. I run qemu with "-soundhw all" flag.
> 
>  0 [Dummy          ]: Dummy - Dummy
>                       Dummy 1
>  1 [Loopback       ]: Loopback - Loopback
>                       Loopback 1
>  2 [VirMIDI        ]: VirMIDI - VirMIDI
>                       Virtual MIDI Card 1
>  3 [port           ]: MTPAV - MTPAV on parallel port
>                       MTPAV on parallel port at 0x378
>  4 [pcsp           ]: PC-Speaker - pcsp
>                       Internal PC-Speaker at port 0x61
>  5 [Intel          ]: HDA-Intel - HDA Intel
>                       HDA Intel at 0xfebf0000 irq 24
> 
> But the patch helps with the warning message :)

Ah, you enabled MTPAV driver.  Please drop CONFIG_SND_MTPAV for your
testing.  This is known to be unstable and is only for a dedicated
parport device, not meant as a generic device to be covered at all.


Takashi