kern/140338: [vm][panic] FreeBSD 8.0 RC2 with vm.pmap.pg_ps_enabled=1 kernel panic with makeworld

[alc at FreeBSD.org]

Synopsis: [vm][panic] FreeBSD 8.0 RC2 with vm.pmap.pg_ps_enabled=1 kernel panic with makeworld

State-Changed-From-To: open->closed
State-Changed-By: alc
State-Changed-When: Mon Jul 5 20:51:26 UTC 2010
State-Changed-Why: 
Ultimately, it was found that the root cause of these crashes was a
hardware bug in AMD Family 10h processors.  In January, AMD documented
this bug as Errata 383.  AMD's recommended workaround is implemented
in FreeBSD 8.1-RELEASE and 7.3-STABLE.

As a workaround in earlier releases, either hw.mca.enabled or
vm.pmap.pg_ps_enabled must be disabled.  In some cases, such
FreeBSD running as a virtual machine, the only option is to
disable vm.pmap.pg_ps_enabled because the hypervisor controls
the machine check hardware.


http://www.freebsd.org/cgi/query-pr.cgi?pr=140338