Unfortunately for this FYI the attempt to produce a dump
failed and so all the information that I have is what I
first captured from the console output: a backtrace.

The context was head -r317015 on a Pine64+ 2GB. At the
time I was experimenting with trying to build a vm.raw
from my own build of FreeBSD. The (root) file system
is on a USB SSD off of a powered USB hub.

panic: ARM64TODO: reclaim_pv_chunk
cpuid = 1
time = 1493332968
KDB: stack backtrace:
db_trace_self() at db_trace_self_wrapper+0x28
         pc = 0xffff000000605cc0  lr = 0xffff0000000869cc
         sp = 0xffff000083ba4f00  fp = 0xffff000083ba5110

db_trace_self_wrapper() at vpanic+0x164
         pc = 0xffff0000000869cc  lr = 0xffff00000031d464
         sp = 0xffff000083ba5120  fp = 0xffff000083ba5190

vpanic() at panic+0x4c
         pc = 0xffff00000031d464  lr = 0xffff00000031d2fc
         sp = 0xffff000083ba51a0  fp = 0xffff000083ba5220

panic() at reclaim_pv_chunk+0x10
         pc = 0xffff00000031d2fc  lr = 0xffff00000061a234
         sp = 0xffff000083ba5230  fp = 0xffff000083ba5230

reclaim_pv_chunk() at get_pv_entry+0x240
         pc = 0xffff00000061a234  lr = 0xffff000000616184
         sp = 0xffff000083ba5240  fp = 0xffff000083ba5260

get_pv_entry() at pmap_enter+0x694
         pc = 0xffff000000616184  lr = 0xffff0000006156a0
         sp = 0xffff000083ba5270  fp = 0xffff000083ba5300

pmap_enter() at vm_fault_hold+0x28c
         pc = 0xffff0000006156a0  lr = 0xffff0000005b9740
         sp = 0xffff000083ba5310  fp = 0xffff000083ba5460

vm_fault_hold() at vm_fault+0x70
         pc = 0xffff0000005b9740  lr = 0xffff0000005b9464
         sp = 0xffff000083ba5470  fp = 0xffff000083ba54a0

vm_fault() at data_abort+0xe0
         pc = 0xffff0000005b9464  lr = 0xffff00000061ad94
         sp = 0xffff000083ba54b0  fp = 0xffff000083ba5560

data_abort() at handle_el1h_sync+0x70
         pc = 0xffff00000061ad94  lr = 0xffff000000607870
         sp = 0xffff000083ba5570  fp = 0xffff000083ba5680

handle_el1h_sync() at kern_select+0x9fc
         pc = 0xffff000000607870  lr = 0xffff00000037db3c
         sp = 0xffff000083ba5690  fp = 0xffff000083ba58f0

kern_select() at sys_select+0x5c
         pc = 0xffff00000037db3c  lr = 0xffff00000037dc58
         sp = 0xffff000083ba5900  fp = 0xffff000083ba5930

sys_select() at do_el0_sync+0xa48
         pc = 0xffff00000037dc58  lr = 0xffff00000061b91c
         sp = 0xffff000083ba5940  fp = 0xffff000083ba5a70

do_el0_sync() at handle_el0_sync+0x6c
         pc = 0xffff00000061b91c  lr = 0xffff0000006079e8
         sp = 0xffff000083ba5a80  fp = 0xffff000083ba5b90

handle_el0_sync() at 0x4948c
         pc = 0xffff0000006079e8  lr = 0x000000000004948c
         sp = 0xffff000083ba5ba0  fp = 0x0000ffffffffd960

Mark Millard
markmi at dsl-only.net

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