-F   Force the generation of fake exit timestamps if dprofpp reports
         that the profile is garbled. This is only useful if dprofpp
         determines that the profile is garbled due to missing exit
         timestamps. You're on your own if you do this. Consult the BUGS
         section.
[...]
BUGS
    Applications which call _exit() or exec() from within a subroutine will
    leave an incomplete profile. See the -F option.