/proc Restrictions

A 32-bit program that uses /proc is able to look at 32-bit processes, but is not able to understand all attributes of a 64-bit process; the existing interfaces and data structures that describe the process are not large enough to contain the 64-bit quantities involved. Such programs need to be recompiled as 64-bit programs in order to work with both 32-bit and 64-bit processes. This is most typically a problem for debuggers.