[Bug 232616] [PowerPC64] Reset from db> does not reboot

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=232616

            Bug ID: 232616
           Summary: [PowerPC64] Reset from db> does not reboot
           Product: Base System
           Version: CURRENT
          Hardware: powerpc
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: sbruno at FreeBSD.org

It appears that the calls to OPAL to reset the box from the debugger prompt
don't succeed in rebooting the box.  If you drop to debugger on the Tyan Power8
hosts, and issue a reset command, the machine will not reboot.


fatal user trap:

   exception       = 0x1500 (unknown)
   srr0            = 0x8102a9ae4 (0x400000080e629ae4)
   srr1            = 0x900000000000f032
   current msr     = 0x9000000000009032
   lr              = 0x10000504 (0x400000000e380504)
   curthread       = 0xc00000001cf58000
          pid = 61703, comm = 60519.exe

[ thread pid 61703 tid 101117 ]
Stopped at      0x8102a9ae4
db> [-- sbruno at conserver.nyi.freebsd.org attached -- Wed Oct 24 13:27:45 2018]
bt
Tracing pid 61703 tid 101117 td 0xc00000001cf58000
KDB: reentering
KDB: stack backtrace:
0xe0000000f8c108c0: at .kdb_backtrace+0x5c
0xe0000000f8c109f0: at .kdb_reenter+0x44
0xe0000000f8c10a70: at .trap+0x84
0xe0000000f8c10c30: at .powerpc_interrupt+0x290
0xe0000000f8c10cd0: kernel DSI read trap @ 0x3fffffffffffd1d0 by
.db_write_bytes+0x1dc: srr1=0x9000000000001032
            r1=0xe0000000f8c10f80 cr=0x2000f024 xer=0x20000000 ctr=0
r2=0xc000000002d4f5b0 sr=0x40000000
0xe0000000f8c10f80: at -0x4
0xe0000000f8c11010: at .db_trace_thread+0x38
0xe0000000f8c110a0: at .db_command_init+0x910
0xe0000000f8c11130: at .db_skip_to_eol+0x6cc
0xe0000000f8c11260: at .db_command_loop+0x74
0xe0000000f8c112e0: at .db_fetch_ksymtab+0x1fc
0xe0000000f8c11460: at .kdb_trap+0x18c
0xe0000000f8c11530: at .cpu_fetch_syscall_args+0x69c
0xe0000000f8c115c0: at .trap+0xe1c
0xe0000000f8c11780: at .powerpc_interrupt+0x290
0xe0000000f8c11820: user trap 0x1500 by 0x8102a9ae4: srr1=0x900000000000f032
            r1=0x3fffffffffffd1d0 cr=0x24000028 xer=0 ctr=0x10000818
r2=0x10018be0
db> reset
[157832.066391229,5] OPAL: Reboot request...
[157832.066469165,5] RESET: Initiating fast reboot 8...
[157833.068031022,5] RESET: Fast reboot timed out waiting for secondaries to
call in

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