[CentOS] segfaults with 8 gig of ram

Thu Mar 22 11:27:20 UTC 2007
tblader <tblader at flambeau.com>

Hello All.
I have five Centos 4.4 x86_64 (amd fx-62) boxes with
4 gig of Corsair dual channel ram running
kernel 2.6.9-42.0.10.EL (smp).

The sixth box is the same except for video card and ram.
It is using 8gig of GSkill dual channel ram and has
a very cheap ATI video card in it.  This box will segfault
on boot unless I use noapic acpi=off and nolapic.  Even
with these boot params, the box is not 100% stable.  I have
seen udev segfault right when booting and also when copying
15 meg files from /tmp to /usr will lock things up sometimes.
Yum and Perl have gotten corrupted as well at different times.
I have 5 fans in the box to vent heat and the BIOS reports
the CPU running around 90 degrees Farenheit when rebooting.

I have run memtest86 (from Knoppix 5.1) all night long on the
8 gig of ram and it comes up OK.  In the past, we have found
problematic Corsair ram this way.  This 8 gig seems to be
OK as far as memtest thinks.

Today I will begin removing ram and testing to see what
happens.  Does anyone have some ideas what might be the
problem?  All the other five boxes with Corsair ram work