8.0RC2 amd64 - kernel panic running make buildworld
des at des.no
Wed Nov 4 15:24:02 UTC 2009
Kai Gallasch <gallasch at free.de> writes:
> I installed 8.0RC2-amd64 on an 8-core opteron server a few days ago.
> When I try to do a make buildworld or make buildkernel the server
> reboots without any message left in the logs. The same happens
> when building bigger ports (for example ruby18 or perl58)
Could it be related to this? What's your CPUID?
Date: Wed Nov 4 01:32:59 2009
New Revision: 198868
Opteron rev E family of processor expose a bug where, in very rare
ocassions, memory barriers semantic is not honoured by the hardware
itself. As a result, some random breakage can happen in uninvestigable
ways (for further explanation see at the content of the commit itself).
As long as just a specific familly is bugged of an entire architecture
is broken, a complete fix-up is impratical without harming to some
extents the other correct cases.
Considering that (and considering the frequency of the bug exposure)
just print out a warning message if the affected machine is identified.
Pointed out by: Samy Al Bahra <sbahra at repnop dot org>
Help on wordings by: jeff
MFC: 3 days
Dag-Erling Smørgrav - des at des.no
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