dump / mksnap_ffs

[dane foster]

Problem: Using dump L on a large, volatile filesystem causes machine to 
freeze. No error is reported, nor logged.

This machine is a mail host for our network, holding mail spools 
totaling 20G or so. Using amanda to call dump, causes the machine to 
freeze within 5 minutes of dump running.
The problem also seems to be affecting a PostgreSQL host now. Can not 
reproduce on a test machine, nor am I keen to keep freezing live 
machines.. will do for debugging purposes if someone can tell me how to 
debug. Both are running RELENG_5_2_1_RELEASE with security patches 
applied.

kernel config (IBMT) is included, the only other non-default setting 
are:

kern.maxfiles: 24654
net.inet.udp.maxdgram: 63535



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