[Bug 249250] 12.2-BETA1 panics at boot on powerpc64

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=249250

            Bug ID: 249250
           Summary: 12.2-BETA1 panics at boot on powerpc64
           Product: Base System
           Version: 12.1-STABLE
          Hardware: powerpc
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: pkubaj at FreeBSD.org

Full boot log:
[ 6838.073526] kexec_core: Starting new kernel
---<<BOOT>>---
Copyright (c) 1992-2020 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 12.2-BETA1 r365622 GENERIC powerpc
gcc version 4.2.1 20070831 patched [FreeBSD]
VT: init without driver.
cpu0: IBM POWER9 revision 2.2, 2700.00 MHz
cpu0: Features
dc007182<PPC32,PPC64,ALTIVEC,FPU,MMU,SMT,ISNOOP,ARCH205,ARCH206,VSX,TRUELE>
cpu0: Features2
eee00000<ARCH207,HTM,DSCR,ISEL,TAR,VCRYPTO,ARCH300,IEEE128,DARN>
real memory  = 68354945024 (65188 MB)
avail memory = 65621626880 (62581 MB)
FreeBSD/SMP: Multiprocessor System Detected: 16 CPUs
arc4random: no preloaded entropy cache
panic: Duplicate children in 0xc000000003a2ee90.  mask (ffff,0,0,0) child
(f,0,0,0)
cpuid = 0
time = 1
KDB: stack backtrace:
#0 0xc000000002a293cc at .kdb_backtrace+0x88
#1 0xc0000000029c0cb8 at .vpanic+0x1b4
#2 0xc0000000029c0d84 at .panic+0x38
#3 0xc000000002a3e3b4 at .topo_init_root+0x1d0
#4 0xc000000002a3e67c at .smp_topo_1level+0x8c
#5 0xc000000002df7704 at .opal_call+0x414
#6 0xc000000002e0af58 at .cpu_topo+0x6c
#7 0xc000000002a3e7f8 at .smp_topo+0x11c
#8 0xc000000002a05504 at .sched_exit+0x64
#9 0xc00000000293af24 at .mi_startup+0x118
#10 0xc000000002402454 at .__start+0xc4
Uptime: 1s
Automatic reboot in 15 seconds - press a key on the console to abort

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