Hello,

I think, something is wrong in the auich driver from 1.6F. I updated today my 
kernel from 1.6E to 1.6F. I have two lines in rc.local:

/usr/bin/audioctl -w play=48000,2,16,slinear_le
/usr/bin/audioctl -w record=48000,2,16,slinear_le

that caused a kernel panic. 1.6E (from about an week ago) works fine.
Here is the panic message (copied by hand :)):

kernel: integer divide fault trap, code = 0
Stopped in pid 277 (audioctl) at auich_set_rate+0x73: divl 0xe4(%ecx), %eax

Regards,
Mihai