panic while kldloading nullfs.ko

[Kris Kennaway]

This happens repeatably on an e450 running 5.3-R, when doing 'kldload
nullfs.ko'.  The module was freshly built and I verified that the
sources are in sync, so it's not because of staleness.

Kris

panic: trap: fast data access mmu miss
cpuid = 2
KDB: enter: panic
[thread 100058]
Stopped at      kdb_enter+0x38: ta              %xcc, 1
db> tr
panic() at panic+0x214
trap() at trap+0x13c
-- fast data access mmu miss tar=0x51a000 %o7=0xc013bf64 --
malloc_type_zone_allocated() at malloc_type_zone_allocated+0x14
malloc() at malloc+0x74
hashinit() at hashinit+0x34
nullfs_init() at nullfs_init+0x14
vfs_register() at vfs_register+0x1e0
vfs_modevent() at vfs_modevent+0x2c
module_register_init() at module_register_init+0x48
linker_load_module() at linker_load_module+0x810
kldload() at kldload+0x144
syscall() at syscall+0x24c
-- syscall (304, FreeBSD ELF64, kldload) %o7=0x100a08 --
userland() at 0x4039e988
user trace: trap %o7=0x100a08
pc 0x4039e988, sp 0x7fdffffe151
pc 0x1007f0, sp 0x7fdffffe211
pc 0x40208c34, sp 0x7fdffffe2d1
done
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