ports/138596: [MAINTAINER] sysutils/samesame vlruwk problem

[Alex de Kruijff]

>Number:         138596
>Category:       ports
>Synopsis:       [MAINTAINER] sysutils/samesame vlruwk problem
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-ports-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          maintainer-update
>Submitter-Id:   current-users
>Arrival-Date:   Sun Sep 06 22:00:02 UTC 2009
>Closed-Date:
>Last-Modified:
>Originator:     Alex de Kruijff
>Release:        
>Organization:
>Environment:

FreeBSD Server1.lan 6.1-RELEASE-p20 FreeBSD 6.1-RELEASE-p20 #0: Wed Nov 14 02:07:49 CET 2007     akruijff at Server1.lan:/temp/obj/temp/src/sys/SERVER-SMP  i386

FreeBSD Gateway.lan 7.1-RELEASE-p2 FreeBSD 7.1-RELEASE-p2 #0: Fri Feb  6 03:34:06 CET 2009     akruijff at Gateway.lan:/temp/obj/temp/src/sys/SERVER  i386

>Description:
        
If unlink(2) is called very quicky, very ofter in a small amount of time,
then the system is left in a vlruwk state. 'sysctl -a | grep vn' shows
that there are few free vnodes. It just so happens that my program has a
use for that.

>How-To-Repeat:
        
Wait for report ports/138590 to be handeld, then
samefile -V and sameln -V should give "SameSame 1.5 ..."

cp -Rp /usr/src /usr/src1
cp -Rp /usr/src /usr/src2
cp -Rp /usr/src /usr/src..
cp -Rp /usr/src /usr/srcN
find /usr/src* -type f | samefile -i > .samefile
sameln -w < .samefile
>Fix:

1) Whe using -w hurts, don't use it. It can still be used in a pipe but
   there's little advantage in that.
2) It looks like a problem in the kernel.
3) A work around in the SameSame code:

I'm assuming this is FreeBSD related, therefor I was thinking of patch
file. The patch file should add code that checks the vnodes level. It
can do this by modifing the file src/mainAction.cpp just before the line:
"// Is it time to sync?".

I don't work on this option any time soon. Anyone else is welkomed to.

>Release-Note:
>Audit-Trail:
>Unformatted: