sparc64 crash

panic: vm_fault: fault on nofault entry, addr: 1c0584000
cpuid = 1
KDB: stack backtrace:
panic() at panic+0x1d4
vm_fault_hold() at vm_fault_hold+0x174
vm_fault() at vm_fault+0x88
trap_pfault() at trap_pfault+0x2e4
trap() at trap+0x308
-- fast instruction access mmu miss tar=0x1c0584000 %o7=0x1a2544bcc --
_end() at 0x1c0584ae0
vfs_modevent() at vfs_modevent+0x45c
module_register_init() at module_register_init+0x150
linker_load_module() at linker_load_module+0xa98
kern_kldload() at kern_kldload+0xc0
sys_kldload() at sys_kldload+0x60
syscall() at syscall+0x320
-- syscall (304, FreeBSD ELF64, sys_kldload) %o7=0x100f4c --
userland() at 0x4047dd28
user trace: trap %o7=0x100f4c
pc 0x4047dd28, sp 0x7fdffffdd51
pc 0x100bc4, sp 0x7fdffffe2d1
pc 0x402038f4, sp 0x7fdffffe391
done
KDB: enter: panic
[ thread pid 24676 tid 100336 ]
Stopped at      kdb_enter+0x80: ta              %xcc, 1
db> bt
Tracing pid 24676 tid 100336 td 0xfffff80005074db0
panic() at panic+0x218
vm_fault_hold() at vm_fault_hold+0x174
vm_fault() at vm_fault+0x88
trap_pfault() at trap_pfault+0x2e4
trap() at trap+0x308
-- fast instruction access mmu miss tar=0x1c0584000 %o7=0x1a2544bcc --
_end() at 0x1c0584ae0
vfs_modevent() at vfs_modevent+0x45c
module_register_init() at module_register_init+0x150
linker_load_module() at linker_load_module+0xa98
kern_kldload() at kern_kldload+0xc0
sys_kldload() at sys_kldload+0x60
syscall() at syscall+0x320
-- syscall (304, FreeBSD ELF64, sys_kldload) %o7=0x100f4c --
userland() at 0x4047dd28
user trace: trap %o7=0x100f4c
pc 0x4047dd28, sp 0x7fdffffdd51
pc 0x100bc4, sp 0x7fdffffe2d1
pc 0x402038f4, sp 0x7fdffffe391
done
db> dump
Cannot dump: no dump device specified.