In newer strace's, when both -c and -ff are invoked, strace returns the
following error: "strace: -c and -ff are mutually exclusive options".
This is also now documented in the strace(1) manpage with:

  -ff        If the -o filename option is in effect, each processes trace
              is written to filename.pid where pid is the numeric process
              id of each process.  This is incompatible  with  -c,  since  no
              per-process counts are kept.

Given that the current behavior notifies the user won't do what is
requested, and it is documented in the strace manpage, closing as Fix
Released.Thanks!

** Changed in: strace (Ubuntu)
       Status: Confirmed => Fix Released

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'strace -ff -c -o filename' spits out null output
https://bugs.launchpad.net/bugs/53974
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