Ok, problem solved, nothing related to the kernel, sorry for the post :(
in short: I install new ram the day before, around 15 boot crash with testing,
it he process I lost pam.d/common-auth file and /etc/crypttab ...
This missing file let me think I have the same bug.
Now 4.4.0-42.62 is fine :)
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4.4.0-40-generic no prompts for disk encryption + loops on dots load
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