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

[Luke Ross <luke@lukeross.name>]

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?

Thanks,

Luke

[1] http://www.spinics.net/lists/alsa-devel/msg03536.html

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