kern/44225: KDASSERT(parent->gap == uvm_rb_gap(parent)) when some process exits

[lacombar%gmail.com@localhost]

>Number:         44225
>Category:       kern
>Synopsis:       KDASSERT(parent->gap == uvm_rb_gap(parent)) when some process 
>exits
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Dec 12 19:15:01 +0000 2010
>Originator:     Arnaud Lacombe
>Release:        5.99.25
>Organization:
n/a
>Environment:
netbsd 5.99.25 
>Description:
When mplayer exit, the system crash sometimes (potentially several time in a 
row) on the following assertion:

KDASSERT() in uvm_map.c:
uvm_rb_fixup():
406: KDASSERT(parent->gap == uvm_rb_gap(parent));

backtrace:
uvm_rb_fixup()
uvm_unmap_remove()
uvm_unmap1()
exit1()

More recent -current does not boot on this hardware.
>How-To-Repeat:
play videos with mplayer and exit it (with 'q')
>Fix: