kern/37668: lfs deadlocks, possibly due to v_numoutput leak

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>Number:         37668
>Category:       kern
>Synopsis:       lfs deadlocks, possibly due to v_numoutput leak
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jan 02 14:05:02 +0000 2008
>Originator:     Andrew Doran
>Release:        4.99.48
>Organization:
The NetBSD Project
>Environment:
n/a
>Description:
lfs file system with a high write rate will eventually deadlock.
Threads are waiting for v_numoutput to drain, perhaps because:

- the accounting is wrong
- or the buffers are never being flushed
- or flushed buffers are not being passed to lfs on completion

>How-To-Repeat:
tar cf - /usr/src | (cd /lfs; tar xf -)

>Fix:
Unknown