> Kernel code compiled with DIAGNOSTIC (DEADLOCKDEBUG?) or similar should
> include extra code that checks for programming mistakes like these at
> run time and panic's the box.

deadlock detection code would be need to be part of the locking
subsystem -- the very part of the code which had this bug.

> If Bill can make this sort of programming mistake then I'm sure others
> will too - and they may not even be developers.

Uh, please check your bug attributions.  I did not make the change to
add wakeup_one().

				- Bill