Hyper-Threading problem (was: panic: vwakeup: neg numoutput, [...])

[Jukka Salmi <j+nbsd%2009.salmi.ch@localhost>]

Jukka Salmi --> current-users (2009-04-01 21:07:31 +0200):
[...]
> panic: vwakeup: neg numoutput, vp 0xcd1fff24
> fatal breakpoint trap in supervisor mode
> trap type 1 code 0 eip c0238154 cs 8 eflags 246 cr2 bb8f7000 ilevel 3
> Stopped in pid 0.4 (system) at  netbsd:breakpoint+0x4:  popl    %ebp
> db{0}> bt
> breakpoint(c0990a55,cc1a3cfc,c09ae240,cbba9780,c0100ddf,cc1a3d00,3,6,3,c2972a80)
>  at netbsd:breakpoint+0x4
> panic(c099270e,cd1fff24,cc1a3d20,c068f6f8,c37a9248,0,0,3,c37a9248,c09ae240) 
> at netbsd:panic+0x1ca
> vwakeup(c37a9248,0,0,3,c37a9248,c09ae240,cc1a3d40,c068f76a,3,c068f7a3) at 
> netbsd:vwakeup+0x45
> biodone2(3,c068f7a3,8,282,cbb9e278,cbb9e004,cc1a3d80,c0492c7c,0,cbba9780) at 
> netbsd:biodone2+0xc8
> biointr(0,cbba9780,cbba9c80,cc1a3d80,0,0,0,0,3,0) at netbsd:biointr+0x3a
> softint_dispatch(d77b8520,3,0,0,0,0,cc1a3d90,cc1a3b68,cc1a3bc0,28) at 
> netbsd:softint_dispatch+0x7c
[...]

This seems to happen reproducibly, even on 5.99.9: the system panics as
described some minutes after starting a release build.

However, since I disabled Hyper-Threading (the system has a Pentium 4
CPU) in the BIOS, I didn't manage to reproduce the problem so far.  Are
there known problems with HTT and NetBSD?  Having it disabled is not a
problem for me, but I'm not sure whether it might be worth sending a PR
or not.


Regards, Jukka

-- 
bashian roulette:
$ ((RANDOM%6)) || rm -rf ~