Regression test failure.

I am receiving a regression test failure in about 1 out of 12 test runs.  
I searched the bugs mailling list and have not found a similar problem.

The system is a RedHat 7.3 system running the UP kernel 2.4.18-10 on an 
800MHz Athlon. I didn't do any kernel tuning.

I am compiling postgresql-7.2.3 with the following options:

 ./configure  --with-tcl --enable-syslog --enable-multibyte

greping FAILED on regression.out gives:
     create_index         ... FAILED
test sanity_check         ... FAILED
test select               ... FAILED

I have attached a bzip2 tar file that contains

  log/postmaster.log
  regression.diffs



Thanks,
Robert