[Bug 239245] r350018 will panic on ppc64 PowerMac G5 in vm_phys_enqueue_contig

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239245

            Bug ID: 239245
           Summary: r350018 will panic on ppc64 PowerMac G5 in
                    vm_phys_enqueue_contig
           Product: Base System
           Version: CURRENT
          Hardware: powerpc
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: dclarke at blastwave.org

As seen also by Francis Little while working on bugid 238730 :

KDB: debugger backends: ddb
KDB: current backend: ddb
---<<BOOT>>---
Copyright (c) 1992-2019 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 13.0-CURRENT #0 r350018M: Mon Jul 15 23:32:27 GMT 2019
    root at hydra:/usr/obj/usr/src/r350018/powerpc.powerpc64/sys/GENERIC64 powerpc
gcc version 4.2.1 20070831 patched [FreeBSD]
WARNING: WITNESS option enabled, expect reduced performance.
panic: segind 127 m 0xc000000273832640
cpuid = 0
time = 1
KDB: stack backtrace:
0xe000000000008500: at .kdb_backtrace+0x5c
0xe000000000008630: at .vpanic+0x1b4
0xe0000000000086f0: at .panic+0x38
0xe000000000008780: at .vm_phys_enqueue_contig+0x64
0xe000000000008850: at .vm_page_startup+0x7b4
0xe000000000008920: at .vm_mem_init+0x30
0xe0000000000089b0: at .mi_startup+0x1f8
0xe000000000008a50: at .btext+0xc4
KDB: enter: panic
[ thread pid 0 tid 0 ]
Stopped at      .kdb_enter+0x60:        ld      r2, r1, 0x28
db>

Carefully transcribed from a photo taken with a cell phone.
See attached image and please advise on any error and I hope
that Francis Little can confirm that he sees the exact same
panic on similar PowerMac G5 quad hardware with 8GB memory.


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

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