[Bug bpf/24324] bpf map entry 0: Operation not permitted

[me at serhei dot io]

https://sourceware.org/bugzilla/show_bug.cgi?id=24324

--- Comment #1 from Serhei Makarov <me at serhei dot io> ---
As suspected, applying this quick fix on Fedora can lead to subtler resource
exhaustion, so committing it to master is a no-go for now.

I do notice that the testsuite can produce orphaned stapbpf processes which may
be holding the pinned memory, or some other resource that runs out more slowly
than the finite rlimit I was using.

root       482  0.0  0.0  80144  3848 pts/6    D    16:18   0:00
/opt/systemtap/bin/stapbpf /tmp/stapfEnTr4/stap_481.bo
root       494  0.0  0.0   6412  1760 pts/6    D    16:18   0:00
/opt/systemtap/bin/stapbpf /tmp/stapm3M5Nd/stap_493.bo
root       508  0.0  0.0   6376  1676 pts/6    D    16:19   0:00
/opt/systemtap/bin/stapbpf /tmp/stap7RZrMT/stap_507.bo
root       643  0.0  0.0   6384  1720 pts/6    D    16:21   0:00
/opt/systemtap/bin/stapbpf /tmp/stapMhTLZX/stap_642.bo
root       666  0.0  0.0   6384  1644 pts/6    D    16:21   0:00
/opt/systemtap/bin/stapbpf /tmp/stap1ME9en/stap_663.bo
root       688  0.0  0.0   6384  1648 pts/6    D    16:22   0:00
/opt/systemtap/bin/stapbpf /tmp/stapd3AOZs/stap_687.bo
serhei     746  0.0  0.0   6004   760 pts/6    S+   16:22   0:00 grep
--color=auto stapbpf

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