Seen on some of the various FreeBSD buildbots:

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ERROR: test_posix_fallocate (test.test_posix.PosixTester)
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Traceback (most recent call last):
  File "/usr/home/buildbot/python/3.7.koobs-freebsd-current/build/Lib/test/test_posix.py", line 342, in test_posix_fallocate
    posix.posix_fallocate(fd, 0, 10)
OSError: [Errno 22] Invalid argument
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As discussed in Issue31106 msg312453 and successors, the failure is due to posix_fallocate not being implemented on ZFS and the difficulty of determining in a platform-independent way what kind of file system a given file resides on.  The test already ignores EINVAL ("Invalid argument") errors when run on Solaris-type platforms due to the common use of ZFS there.  In lieu of a more precise test for fs type, we should also ignore EINVAL errors in this test when run on *BSD platforms.  Also, rather than silently ignoring the error, it may be better to use a SkipTest message.