libarchive version 1.3.1 appears to be broken

[Jeff Davis]

When I pass the "z" flag to tar when creating an archive, and the files
grow while the archive is being created, I get an invalid gzip output:

$ tar --version
bsdtar 1.2.53 - libarchive 1.3.1

$ tar zcf mybackup.tar.gz mybackup/ # files in mybackup/ are growing
tar: Truncated write; file may have grown while being archived. 
tar: Truncated write; file may have grown while being archived. 
tar: GZip compression failed 

$ gzip -dc mybackup.tar.gz > /dev/null
gzip: ../mybackup.tar.gz: unexpected end of file
gzip: ../mybackup.tar.gz: uncompress failed

However, it appears to work fine on:

$ tar --version
bsdtar 1.2.53 - libarchive 1.2.53

Regards,
	Jeff Davis