make[1]: *** wait: No child processes during make -j8 check

[Martin Sebor]

I've run into this failure during make check in the past with
a very large make -j value (such as -j128), but today I've had
two consecutive make check runs fail with -j12 and -j8 on my 8
core laptop with no much else going on.  The last thing running
was the go test suite.  Has something changed recently that
could be behind it?  (My user process limit is 62863.)

Thanks
Martin