Do you still have this problem? I have tried to reproduce it, but I get the a's 
and b's nicely mixed.
Also cpu utilization is > 100%:
  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND           
 9845 albert    25   0 11064  876  752 R  145  0.0   0:10.14 multicore     

The only difference I can see from your report is that I have a slightly newer 
kernel then you have:
Linux ubuntu 2.6.20-16-generic #2 SMP Sun Sep 23 19:50:39 UTC 2007 i686 
GNU/Linux

Can you upgrade to the latest kernel and try again?
I have an Intel T7200 processor. What processor do you have?

** Changed in: ubuntu
       Status: New => Incomplete

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Multithreading not utilizing both cores
https://bugs.launchpad.net/bugs/139631
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