Re: "Unable to handle kernel paging request" panic in snd-usb-audio on x86_64

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At Wed, 20 Sep 2006 23:51:28 +0100,
Luke Ross wrote:
> 
> Hi,
> 
> Last month I submitted a patch adding support for non-standard sample 
> rates to the snd-usb-audio driver [1], which was added to the ALSA GIT 
> tree.
> 
> This works fine with 2.6.16 on i386 on one of my machines, but causes a 
> kernel panic on opening the sound device on my other machine (dual AMD 
> Opterton with x86_64 kernel).
> 
> I need to go and hook up a serial cable to get the full panic, but the 
> gist of it is:
> 
> Unable to handle kernel paging request
> 
> snd_pcm_hw_refine+658
> snd_pcm_common_ioctl+423
> snd_pcm_hw_constraint_list+31
> snd_usb_pcm_open+976
> snd_pcm_hw_constraint_minmax+39
> 
> RIP: snd_pcm_hw_params_any
> 
> I've had this on both 2.6.17 with only the above patch (which seems to 
> compile cleanly), and also on 2.6.18-rc7 with the MM patches whih 
> includes a git-alsa pull.
> 
> Before I dig out the serial cable to get a full panic trace, is there 
> anything which I ought to be looking at as a first port of call, which 
> would explain why this happens on x86_64 bit not i386?

Try to build with debug option.  Maybe it comes from OSS emulation?

Or are you using dmix?


Takashi

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