[grsec] pid randomization problem - process won't execute and will return zero value

[Brad Spengler]

> P.S. Race condition (setpgid/waitpid) in bash?

That seems to be the issue, as I've been able to eliminate the 
possibility of a pid reuse race, and even changed the lock in setpgid to 
a writelock so that it cannot race at the kernel level with pid 
selection, and /bin/false will eventually still return true.

-Brad
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