There's not much to go on when I look at the code snippet you posted (if there is more, please post it).
I suspect this has something to do with TSC (clock source), but I cannot point you to anything specific.
This could be caused by:
- a BIOS setting,
- incompatible/very new hardware,
- kernel setting.
I would check the BIOS and see if all is correct, no harm in checking.
Searching the net the closest I came was this one: motherboard with Q9300 CPU does not boot SMP
It cannot hurt to try the idle=poll
suggestion (but reading the article I wonder if it is a solution).
Trying to debug this option might be hard to do, I would try one of the other LFS liveCD's. I never had any problems with the r2145 version (both x86 and x86_64).
I noticed you posted this issue to the lfs mailing list, maybe someone of them has seen this error before.
Hope this helps.