Native preemption is the culprit [was Re: today's CURRENT lockups]

[Johan Pettersson]

> Per my earlier post, I've experienced similar unreliability.  The work
> around I'm using is to build with "#define PREEMPTION" from param.h
> disabled.  This results in a quite usable kernel, although quite
> probably more poor interrupt handling latency, etc.
> 
> Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
> robert at fledge.watson.org      Principal Research Scientist, McAfee
> Research
> 

Do you or John or any one else know whats can cause this? Is there any
ongoing work to fix this?