Adaptec AIC-7901 (ahd) broken with 6.0-BETA2

[Justin T. Gibbs]

>> It looks like the system was able to talk to the controller and your
>> drive just fine, but hung later.  Can you break into the debugger
>> and get a stack trace of where the system is hung?
>>
> Pardon me, but how do I break into the debugger ? :)
> I know, if I'm using -CURRENT I should know how to do it... could you
> point me at the right direction anyway ? :-)

http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug-online-ddb.html

> Even if I could break into debugger, I would need to get a serial console
> working, otherwise a stack trace could be quite hard to get. I don't
> think I want to type this by hand...

The top few functions are likely all that are important.  <Scroll-Lock> 
followed by
PgUp is your friend.

--
Justin