[Bug 238730] r349241 on PowerMac G5 instant panic in vm_mem_init(0)

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238730

            Bug ID: 238730
           Summary: r349241 on PowerMac G5 instant panic in vm_mem_init(0)
           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

Immediately after telling the loader : 

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

boot -v


.
.
.
FreeBSD 13.0-CURRENT r349241 GENERIC powerpc
.
.
.
WARNING: WITNESS option enabled, expect reduced performance.
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> 

So that was fast. Looks like the vmhat layer is at issue.


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

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