kern/38355: lockf deadlock detection is broken after vmlocking

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

>Number:         38355
>Category:       kern
>Synopsis:       lockf deadlock detection is broken after vmlocking
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Apr 02 05:20:01 +0000 2008
>Originator:     YAMAMOTO Takashi <yamt%mwd.biglobe.ne.jp@localhost>
>Release:        NetBSD 4.99.58
>Organization:
        
>Environment:
        
        
Architecture: i386
Machine: i386
>Description:
        the change to convert vfs_lockf.c to use condvars broke
        lockf deadlock detection.

        lf_setlock (ab)uses l_wmesg/l_wchan to follow the lock graph.
        however, they are no longer updated as it expects.
>How-To-Repeat:
        code inspection.
>Fix:
        

>Unformatted: