FreeBSD 13.0-CURRENT r349241 on PowerMac G5 instant panic in vm_mem_init(0)

Just did the usual process on a system that was running r344744 just
fine for a while now.  At boot time I interrupted the loader with

     set usefdt=1
     set debug.rman_debug=1
     set debug.verbose_sysinit=1

Then tried a boot -v which resulted in a nearly instantaneous panic
so early that I only ever saw the normal WARNING: WITNESS option as
usual and then :

subsystem 1000000
    vm_mem_init(0)... panic: segind 91 m 0xc000000273832bf0
cpuid = 0
time = 1
KDB: stack backtrace:
0xe0000000000000008500: at .kdb_backtrace+0x5c
0xe0000000000000008630: at .vpanic+0x1b4
0xe00000000000000086f0: at .panic+0x38
0xe0000000000000008780: at .vm_phys_enqueue_contig+0x64
0xe0000000000000008850: at .vm_page_startup+0x7b4
0xe0000000000000008920: at .vm_mem_init+0x30
0xe00000000000000089b0: at .mi_startup+0x308
0xe0000000000000008a50: at .btext+0xc4
KDB: enter: panic
[ thread pid 0 tid 0 ]
Stopped at      .kdb_enter+0x60:            ld      r2, r1, 0x28
db>

Feels like the vmhat layer but tough to say.

Anyone seen a recent ppc64 kernel boot on these things?


-- 
Dennis Clarke
RISC-V/SPARC/PPC/ARM/CISC
UNIX and Linux spoken
GreyBeard and suspenders optional
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