"panic: trap: fast data access mmu miss" on 5.3-R

[Kris Kennaway]

panic: trap: fast data access mmu miss
db> trace
panic() at panic+0x19c
trap() at trap+0x16c
-- fast data access mmu miss tar=0 %o7=0xc0263bac --
pmap_kenter() at pmap_kenter+0x130
pmap_qenter() at pmap_qenter+0x50
pmap_pinit() at pmap_pinit+0xdc
vmspace_zinit() at vmspace_zinit+0x18
slab_zalloc() at slab_zalloc+0x1dc
uma_zone_slab() at uma_zone_slab+0xb8
uma_zalloc_arg() at uma_zalloc_arg+0x2ec
vmspace_alloc() at vmspace_alloc+0x10
vmspace_fork() at vmspace_fork+0x38
vm_forkproc() at vm_forkproc+0x128
fork1() at fork1+0xc00
fork() at fork+0x10
syscall() at syscall+0x220
-- syscall (2, FreeBSD ELF64, fork) %o7=0x10fe00 --
userland() at 0x40642f88
user trace: trap %o7=0x10fe00
pc 0x40642f88, sp 0x7fdffffd801
pc 0x107750, sp 0x7fdffffd8c1
pc 0x107058, sp 0x7fdffffda81
pc 0x10a3b4, sp 0x7fdffffdb71
pc 0x109c78, sp 0x7fdffffdd01
pc 0x1098e4, sp 0x7fdffffddc1
pc 0x1072ac, sp 0x7fdffffde81
pc 0x1067e8, sp 0x7fdffffe041
pc 0x106700, sp 0x7fdffffe101
pc 0x1114b8, sp 0x7fdffffe1c1
pc 0x111384, sp 0x7fdffffe2a1
pc 0x102330, sp 0x7fdffffe3c1
pc 0x40228c34, sp 0x7fdffffe481
done
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