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Date:	Sun, 21 Oct 2012 16:21:41 +0200
From:	Daniel Mack <>
To:	"Artem S. Tashkinov" <>
	"" <>,,,, alsa-devel <>
Subject: Re: was: Re: A reliable kernel panic (3.6.2) and system crash when
 visiting a particular website

[Cc: alsa-devel]

On 21.10.2012 14:30, Artem S. Tashkinov wrote:
> On Oct 21, 2012, Daniel Mack wrote: 
>> A hint at least. How did you enable the audio record exactly? Can you
>> reproduce this with arecord?
>> What chipset are you on? Please provide both "lspci -v" and "lsusb -v"
>> dumps. As I said, I fail to reproduce that issue on any of my machines.
> All other applications can read from the USB audio without problems, it's
> just something in the way Adobe Flash polls my audio input which causes
> a crash.
> Just video capture (without audio) works just fine in Adobe Flash.

Ok, so that pretty much rules out the host controller. I just wonder why
I still don't see it here, and I haven't heard of any such problem from
anyone else.

Some more questions:

- Which version of Flash are you running?
- Does this also happen with Firefox?
- Does flash access the device directly or via PulseAudio?
- Could you please apply the attached patch and see what it spits out to
dmesg once Flash opens the device? It returns -EINVAL in the hw_params
callback to prevent the actual streaming. On my machine with Flash, I get values of 2/44800/1/32768/2048/0, which seems sane.
Or does your machine still crash before anything is written to the logs?

> Only and only when I choose to use 
> USB Device 0x46d:0x81d my system crashes in Adobe Flash.
> See the screenshot:

When exactly does the crash happen? Right after you selected that entry
from the list? There's a little recording level meter in that dialog.
Does that show any input from the microphone?

> My hardware information can be fetched from here:
> On a second thought that can be even an ALSA crash or pretty much
> anything else.

We'll see. Thanks for your help to sort this out!


View attachment "snd-usb-hwparams.diff" of type "text/x-patch" (779 bytes)

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