kern/156083: ipfw pipe flush - memleak

[Artjom Nikushkin]

>Number:         156083
>Category:       kern
>Synopsis:       ipfw pipe flush - memleak
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Mar 31 09:10:09 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator:     Artjom Nikushkin
>Release:        8.2-RELEASE
>Organization:
Balticom
>Environment:
FreeBSD bsd82-test.balticom.lv 8.2-RELEASE FreeBSD 8.2-RELEASE #0: Fri Feb 18 02:24:46 UTC 2011     root at almeida.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  i386
>Description:
After sequental pipe config/flush, dummynet hits limit of memory and `dmesg` ouputs : "ipfw: setsockopt(IP_DUMMYNET_CONFIGURE): Cannot allocate memory", and crashes. Pipe is configured with src-ip or dst-ip mask (dummynet hash pipes). 

>How-To-Repeat:
In fresh install : 
for ((i=1;$i<2000000; i=$i+1)); do ipfw pipe 1 config bw 10Mbit/s mask src-ip 0xffffffff ; ipfw -f pipe flush ; done

When Wired memory hits about 370Mb of RAM, it crashes. 
It's possible to make it crash faster - rise net.inet.ip.dummynet.hash_size up to the maximum size. 
>Fix:


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