[Bug 256205] lseek() with SEEK_HOLE some times wrongly reports holes on ZFS

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256205

--- Comment #17 from Robert Clausecker <fuz@fuz.su> ---
So yeah, the same approach also works on amd64.  To reproduce:

1. install archivers/star
2. make a zfs dataset and nullfs mount it somewhere.
3. in the nullfs mount, unpack the schilytools
4. build the schilytools by typing "make"
5. type

    star -c -v -f /dev/null -sparse . 2>&1 | grep sparse

   to find spurious sparse files.

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