My shark, running 3.1, just crashed.  I was playing sound through it
and it was otherwise sitting there doing not much, when the sound went
dead.  Looking at the serial console, I found that everything looked
normal until out of the blue I got

cs0: cs_process_rx_dma: DMA buffer out of sync about to reset
Fatal kernel mode prefetch abort at 0xf09ad338
trapframe: 0xf2c6daac, spsr=a0000013
r0 =00000007, r1 =f80d0000, r2 =00000a42, r3 =00000068
r4 =f11c3a00, r5 =00000000, r6 =f10df000, r7 =f0284c40
r8 =00000043, r9 =f11c3a00, r10=f10df038, r11=f2c6db14
UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU

and wedged right there, cursor after that string of Us.

I power-cycled it and it seems to be coming back up normally.  I don't
suppose anyone has any theories about what could be wrong, or thoughts
about how to debug it?  When I deliberately drop into ddb while it's
playing sound, the last half-second or so of sound loops; this didn't
seem to happen when it crashed (unless perhaps by chance there was a
brief silence just then); I don't know whether that's relevant.  There
was Ethernet traffic; the sound was being streamed off another machine,
with the shark doing just the audioplay part.

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