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[no subject]

 If shmaddr is 0, the  system  tries  to  find  an  unmapped
              region  in the range 1 - 1.5G starting from the upper value
              and coming down from there.

If you specify the exact same virtual address in both of your processes
and those addresses are free, shmat will present the segments at the
same address. If shmaddr is 0, the system will pick one for you and it
might pick differently in different processes.