Hello,

> threads is not the problem, i'm much more afraid of that 'sleeps 
> forever' issue because the machine is being colocated -- and 
> unfortunately that are neither able to do a power cycle (at least, it's 
> not available 24/7) nor to provide a serial connection (console)...
I've never had it with -current, Rick said he didn't have it with 2.x, so it may be worth a try.

> because it's a production machine i think i'll go Solaris even with the 
> SP machines :/
That's the safe bet.

Maybe - it you have the time - install the stuff you need on a U5 with NetBSD 2.something and torture it for a while?

have fun
Michael