"panic: trap: fast data access mmu miss" in m_copym

[Kris Kennaway]

This on an u10 running

FreeBSD 5.3-STABLE (NETBOOT) #1: Sun Dec 12 18:38:35 JST 2004

It may already be fixed, but since this is clearly a very infrequent
problem (the other 7 machines with the same kernel have been running
for months) it will be hard to tell empirically.

Unfortunately I don't seem to have a kernel.debug for this machine. 

panic: trap: fast data access mmu miss
cpuid = 0
KDB: enter: panic
[thread 100005]
Stopped at      kdb_enter+0x38: ta              %xcc, 1
db> wh
panic() at panic+0x214
trap() at trap+0x13c
-- fast data access mmu miss tar=0 %o7=0xc02b2090 --
m_copym() at m_copym+0x40
tcp_output() at tcp_output+0xfa4
tcp_input() at tcp_input+0x3680
ip_input() at ip_input+0x150
netisr_processqueue() at netisr_processqueue+0x7c
swi_net() at swi_net+0x154
ithread_loop() at ithread_loop+0x124
fork_exit() at fork_exit+0x68
fork_trampoline() at fork_trampoline+0x8
db>
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