"panic: trap: fast data access mmu miss" on 5.2-C

[Kris Kennaway]

I updated the sparc64 package clients to 5.2-CURRENT 2 days ago, and
one of them panicked today:

panic: trap: fast data access mmu miss
at line 364 in file /var/portbuild/sparc64/src-client/sys/sparc64/sparc64/trap.c
cpuid = 0;
Debugger("panic")
Stopped at      Debugger+0x1c:  ta              %xcc, 1
db> trace
__panic() at __panic+0x17c
trap() at trap+0x3f0
-- fast data access mmu miss tar=0x4410000000 %o7=0xc005e34c --
db_read_bytes() at db_read_bytes+0x1c
db_stack_trace_cmd() at db_stack_trace_cmd+0x1cc
db_print_backtrace() at db_print_backtrace+0x18
backtrace() at backtrace+0x10
witness_checkorder() at witness_checkorder+0x6b0
_mtx_lock_flags() at _mtx_lock_flags+0x84
obj_alloc() at obj_alloc+0x1c
slab_zalloc() at slab_zalloc+0x98
uma_zone_slab() at uma_zone_slab+0xe8
uma_zalloc_internal() at uma_zalloc_internal+0x24
uma_zalloc_arg() at uma_zalloc_arg+0x39c
swp_pager_meta_build() at swp_pager_meta_build+0x104
swap_pager_putpages() at swap_pager_putpages+0x2f8
default_pager_putpages() at default_pager_putpages+0x1c
vm_pageout_flush() at vm_pageout_flush+0x15c
vm_pageout_clean() at vm_pageout_clean+0x324
vm_pageout_scan() at vm_pageout_scan+0x708
vm_pageout() at vm_pageout+0x404
fork_exit() at fork_exit+0x8c
fork_trampoline() at fork_trampoline+0x8
ofw_pci_default_intr_pending() at ofw_pci_default_intr_pending+0x38
panic: trap: fast data access mmu miss
at line 364 in file /var/portbuild/sparc64/src-client/sys/sparc64/sparc64/trap.ccpuid = 0;
Debugger("panic")
Stopped at      Debugger+0x1c:  ta              %xcc, 1
db>
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