kernel panic 6.2-RELEASE SMP dual quad core

Ivan Voras ivoras at
Sat Dec 29 21:43:39 PST 2007

Iain Dooley wrote:
> hi all,
> uname -a
> FreeBSD HOSTNAME 6.2-RELEASE FreeBSD 6.2-RELEASE #0: Fri Jan 12 11:05:30
> UTC 2007 root at  i386
> running on dual quad core intel xeons with 4gb ram.

Are you using PAE? (probably not if this is the generic SMP configuration).

> Fatal trap: 12 page fault while in kernel mode

This only means an equivalent of "segmentation fault" for user-mode
programs. The actual problem can be anything.

> current process = 12 (idle: cpu5)

This is important. The "idle" process does literary nothing and is
highly unlikely to contain a bug.

Does this mean that the problem only appears when the system is idle?

> i've run mprime for 24 hours, and memtest for 3 passes, and a script i
> wrote which just exhausts ram and CPU, then backs off and does it again
> which have been running for 24 hours.

Do your tests stress multiple CPUs? If not, this may be something to
try. Also try disabling CPUs to see if it makes any difference.

By the way, you are likely not to get any performance benefits (and some
performance regressions are likely) with this number of CPUs on FreeBSD
6.2, except if you intend to do CPU-intensive tasks (like scientific
caluclations). If you can, try the latest release candidate of 7.0.

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