Bug#908796: System no longer bootable

[Olaf Zaplinski]

This bug made my 9.6 amd64 system unbootable, the updates were
udev             232-25+deb9u6 to 232-25+deb9u8
libudev1:amd64   232-25+deb9u6 to 232-25+deb9u8

This damaged my trust into Debian stable releases and gives me a sort of 
"Windows 10" feeling. :-(