[Bug 233579] FreeBSD 12.0-RC2 r340839 GENERIC powerpc needs kern.smp.disabled=1 to boot after install

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233579

--- Comment #4 from Dennis Clarke <dclarke at blastwave.org> ---

After speaking with Justin Hibbits we ran some tests with usefdt=1 and see
the following panic :

    fatal kernel trap:

      exception       = 0x300 (data storage interrupt)
      virtual address = 0x907ff7c0c0
      dsisr           = 0x40000000
      srr0            = 0xc000000000a8c918 (0xa8c918)
      srr1            = 0x9000000000001032
      current msr     = 0x9000000000001032
      lr              = 0xc000000000a8c914 (0xa8c914)
      curthread       = 0xc000000001626400
             pid = 0, comm = swapper

    panic: data storage interrupt trap
    cpuid = 0
    time = 1
    KDB: stack backtrace:
    #0 0xc0000000006ef5a8 at .kdb_backtrace+0x88
    #1 0xc000000000688528 at .vpanic+0x1b4
    #2 0xc0000000006885f4 at .panic+0x38
    #3 0xc000000000ab2a74 at .trap_fatal+0x25c
    #4 0xc000000000ab416c at .trap+0x15f0
    #5 0xc000000000aa7cd8 at .powerpc_interrupt+0x234
    Uptime: 1s

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