[linux-dvb] Re: latest mythtv CVS & DEC 2000-t: kernel panic

[Holger Waechtler <holger@convergence.de>]

Des Herriott wrote:
> Hi all,
>
> Here's a puzzler.  A combination of the very latest CVS of MythTV (as of 
> a couple of days ago) and the DEC2000-t USB driver causes a complete 
> system lockup (i.e. I can't even ping the machine remotely)
>
> The problem occurs when I try to watch live TV.  Initially I thought it 
> was a mythfrontend problem, but I then tried a remote frontend, and the 
> backend host crashes, every time.
>
> I can reproduce this reliably with a 2.4.23-epia kernel running on EPIA 
> M-10000, and also a standard Gentoo 2.4.22 kernel running on a Athlon 
> 2600+ box.
>
> If I'm not running the frontend on the same host, I see some kernel 
> panic type messages appear on the screen, but I haven't been able to 
> capture anything yet before they scroll away, followed by a load of 
> "__alloc_pages: 0-order allocation failed: gfp=0x20/0" messages.  (If 
> the front end is running on the same host, it blanks the screen and I 
> don't get to see anything at all)
>
> The problem also seems specific to MythTV - using tzap and mplayer/xine 
> to view /dev/dvb/adapter0/dvr0 still works fine.
>
> Sorry I can't be more informative right now; what I'll try to do next is 
> get some info on what's changed with the DVB code in mythbackend - I can 
> only guess that there's something new in there which is tickling a bug 
> in the dec2000-t driver code.
>
> Also, I'd be very interested to hear from anyone else who's tried the 
> latest Myth code with any DVB device, not just the DEC2000-t.  Maybe 
> it's not a device-specific problem.
Are you using a Myth version with hardware-acceleration code for the 
onchip MPEG decoder helpers for the EPIA? If so you might try to turn 
this and/or the graphics hardware acceleration code off to see where 
exactly the problem is located.

And maybe you want to enable the serial console option in your kernel 
config so that you can catch the oops log on the serial port using a 
second box.

Holger



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