>Symptoms are that the machine locks solid (I think it's disk IO related, 
>but it could be soft-dep or any of a number of other things).  I can't get 
>any backtrace out of the machine since the console is dead.  Certainly the 
>crash seems to happen most when there is heavy disk io involved.  I've 
>seen reports that this might pre-date 1.5 (see PR port-arm32/11921 and 
>port-arm32/9859).

I occasionally see my shark lock up, but some presses on the keyboard
will wake it up.  There's definately some weird interrupt-related stuff
going on there.

--Ken