[Bug 201223] poudriere can panic Mac Mini G4

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=201223

            Bug ID: 201223
           Summary: poudriere can panic Mac Mini G4
           Product: Base System
           Version: 10.1-STABLE
          Hardware: ppc
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: jmmv at FreeBSD.org

Created attachment 158193
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=158193&action=edit
Crash details as saved in /var/crash

I have a Mac Mini G4 running FreeBSD stable-10, originally installed on
September 2014. During this period, the system has been updated along the
stable-10 branch a few times (last as of June 21st).

Over all this time, and today, I have been unable to successfully build a
(reduced) set of packages using poudriere. The machine panics and reboots at
some point or another with:

panic: data storage interrupt trap
cpuid = 0
KDB: stack backtrace:
#0 0x45f3e0 at vpanic+0x138
#1 0x45f480 at panic+0x54
#2 0x77da3c at trap_fatal+0x1bc
#3 0x77ea04 at trap+0xfa0
#4 0x76ee9c at powerpc_interrupt+0x170

(I do not know now if the crashes happen at a deterministic point during the
reduced bulk build.)

I am attaching the full core.txt file for details.

Any hints on how to gather additional data will be welcome.

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