Meanwhile, can you additionally test the attached program, which doesn't use NSProcessInfo (upstream has some suspicions that's the class where the bug is)? You can reuse the same GNUmakefile I sent you earlier.
#import <Foundation/Foundation.h>
int main (void) { CREATE_AUTORELEASE_POOL (pool); NSString *foo = @"Test\n"; printf ("%s", [foo cString]); RELEASE (pool); exit (EXIT_SUCCESS); }