I'm having an interesting problem with the neomagic audio driver ever since
building world and kernel from current sources checked out late this
morning PDT.  Sending any data to the audio device (e.g. cat /kernel >
/dev/audio) results in the following pannic:

Fatal trap 12: page fault while in kernel mode
fault virtual address   = 0xfe271c00
fault code              = supervisor write, page not present
instruction pointer     = 0x8:0xc0145873
stack pointer           = 0x10:0xc93c3d08
frame pointer           = 0x10:0xc93c3d10
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 238 (tcsh)
interrupt mask          = none
trap number             = 12
panic: page fault

The audio device is a Neomagic built onto a Sony VIAO laptop as such:

pcm0: <NeoMagic 256AV> mem 0xfea00000-0xfeafffff,0xfe000000-0xfe3fffff irq
9 at device 8.1 on pci0

Anyone have any idea what could have gone afoul?

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