PROBLEM: (81825) (PATCH ID: OSF505-139)
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This patch ensures that threads created by programs linked -taso run on stacks
with addresses that fit in the 31-bit taso range. Prior to this patch threads
created by taso programs were run on stacks with non-taso addresses, which
could result in truncated address values, and segmentation faults or data
corruption depending on whether the truncated address is valid.