Comment # 1 on bug 1188169 from Antonio Feijoo

Usually dracut enters the emergency shell if any value in rootflags refers to
an unrecognized mount option. That's why it's failing with rootflags=i_version,
try with rootflags=iversion

Excerpt extracted from https://en.opensuse.org/SDB:Ima_evm

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For all examples except those that solely rely on digital signatures for
immutable files, filesystems with iversion mount option support must be used.
btrfs has iversion enabled by default. xfs has iversion support in v5, also
enabled by default. ext4 it requires to add iversion mount option to the
/etc/fstab and also add the kernel command line parameter rootflags=iversion
which will cause the dracut based initrd to add this mount flag for the root
file system. On older version of dracut supposedly rootflags=i_version needs to
be used, but current dracut fails to boot with this variant.
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