kern/39349: cpu affinity can make lwps non-schedulable

[yamt%mwd.biglobe.ne.jp@localhost]

>Number:         39349
>Category:       kern
>Synopsis:       cpu affinity can make lwps non-schedulable
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Aug 14 09:00:00 +0000 2008
>Originator:     YAMAMOTO Takashi <yamt%mwd.biglobe.ne.jp@localhost>
>Release:        NetBSD 4.99.72
>Organization:
        
>Environment:
>Description:
        try:
                # cpuctl offline 0
                # cpuctl identify 0

        "cpuctl identify" binds itself to cpu0, which is offline.
        thus it will never be scheduled.  if it has a lock (eg. p->p_lock),
        the entire system will hang soon.
>How-To-Repeat:
>Fix:
        

>Unformatted: