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I am not sure yet why there is a > difference, but Eugene, perhaps you can take a look into this? > > Kris Here is an example: $ sudo ./build/run-dtrace -s test/unittest/aggs/tst.stack.d [sudo] password for kvanhees: 0xffffffffc0129e86 0xffffffffc0129e86 0xffffffffc0129e86 0xffffffffc0130250 0xffffffffc0130250 0xffffffffc012b2bb 0xffffffffc012b83c vmlinux`schedule+0x9 The strange thing is that it actually does give good results at times. So I am not sure what is going on.