panic: ipi_send: couldn't send ipi

[Kris Kennaway]

Another panic on SMP sparc:

panic: ipi_send: couldn't send ipi
cpuid = 1
KDB: enter: panic
[thread 100158]
Stopped at      kdb_enter+0x38: ta              %xcc, 1
db> trace
panic() at panic+0x19c
cpu_ipi_send() at cpu_ipi_send+0xb8
cpu_ipi_selected() at cpu_ipi_selected+0x38
spitfire_icache_page_inval() at spitfire_icache_page_inval+0x70
pmap_enter() at pmap_enter+0x27c
vm_fault() at vm_fault+0x1200
trap_pfault() at trap_pfault+0x1e4
trap() at trap+0x208
-- fast data access mmu miss tar=0x4041e797 %o7=0x402c2f48 --
userland() at 0x402c2f5c
user trace: trap %o7=0x402c2f48

Kris
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