This doesn't seem to be a bug. From strace(1), -f option:
If the parent process decides to wait(2) for a child
that is currently being traced, it is suspended
until an appropriate child process either terminates
or incurs a signal that would cause it to terminate
(as determined from the child’s current signal dis‐
position).
of course, if that child happens to be strace itself, the "until" bit
probably ceases to apply.
I'm guessing the call to proc.communicate() involves wait()ing.
(Closing bug for now; if further information arises that suggests that
this may still be a bug, please feel free to reopen.)
** Changed in: strace (Ubuntu)
Status: Unconfirmed => Rejected
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strace leaves process SIGSTOPped after detaching
https://bugs.launchpad.net/bugs/103133
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