[c-nsp] 7600 Native IOS Sup2 memory leak - FIB Control Task

[Clinton Work]

I have a large number of 7600 Sup2/MSFC2 distribution routers running
full BGP routes with IOS 12.1(13)Ex. After about 6-12 months of operation 
all of them
run out of free memory on the Sup2 and CEF goes disabled. The culprit
is the FIB Control Task on the Sup2. Flapping BGP or IGP routes seems to
excellerate the memory loss, but Cisco hasn't been able to find an exact
ddts yet. Anybody seen / solved this problem?

I know of the following ddts, but none of them match a slow memory leak
in FIB Control Task.

CSCdz85584: Memory Leak in FIB Control Task when intensive route flap
  ( and the internal CSCea16491 )
For this to happen links have to continuously flap ( more than once a 
minute )

CSCeb57465: MSFC2: continues route flapping used up RP and SP free memory

Sup2 mem:
router# attach 1
router-sp#show mem
                Head    Total(b)     Used(b)     Free(b)   Lowest(b) 
Largest(b)
Processor   42E7C140   184041152   166543408    17497744    11752800 
10468452
      I/O    DE00000    35651584     8760856    26890728    26804296 
26890684

router-sp#show proc mem | inc FIB|Hold
 PID TTY  Allocated      Freed    Holding    Getbufs    Retbufs Process
  72   0  185417104 1487772624  109182664          0          0 FIB Control 
Task


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Clinton Work                clinton at scripty.com
Airdrie, AB