linux-kernel - Re: kernel panic when sending MIDI sequencer events

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Date:	Tue, 25 Jul 2006 22:18:12 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	"Nathan Becker" <nathanbecker@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: kernel panic when sending MIDI sequencer events

At Tue, 25 Jul 2006 22:14:02 +0200,
I wrote:
> 
> At Tue, 25 Jul 2006 13:01:49 -0700,
> Nathan Becker wrote:
> > 
> > Hi,
> > 
> > I'm getting a kernel panic when a program sends a MIDI sequencer
> > event.  Seems to happen in all recent kernels I've tested.  Currently
> > I'm using 2.6.17.7 on an AMD X2 4800+ Nforce4 (Gigabyte K8NXP-SLI)
> > system running Slamd64 10.1 in 64-bit mode. I'm using the ALSA sound
> > modules for intel8x0 for the motherboard sound chip.  I should mention
> > that PCM sound works fine, no crashes and sounds OK.  If I understand
> > correctly, the intel8x0 does not directly support MIDI sound.  I guess
> > this means I need to install Timidity or something to make MIDI sound
> > actually work, but this is of secondary concern.  My primary concern
> > is that when programs send a MIDI event, it crashes the whole system.
> > 
> > Here is an excerpt from the error message as I've copied it from the console:
> > 
> > Call Trace: <ffffffff8038da4d>{rtc_control+56}
> > <ffffffff880b3063>{:snd_rtctimer:rtctimer_start+28}
> > 
> > ...more stuff like that.  Also mentions snd_seq:snd_seq_control_queue+153
> > snd_seq:snd_seq_deliver_single_event+281
> > snd_seq:snd_seq_deliver_event+337
> > snd_seq:queueptr+60
> > snd_seq_client_enqueue_event+119
> 
> Well, it'd be helpful if you can paste more, at least, what kind of
> error it is.  Also, please write what you exactly did, how to
> reproduce it on other one's system.
> 
> 
> > Any help would be greatly appreciated.  Please cc me directly.
> 
> A possibly simple workaround is to disable CONFIG_SND_RTCTIMER.

Oh, also, showing your kernel config is good as a start, too :)


Takashi
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