So, this appears to be caused by a well-intentioned sanity check in Grub
that sees an error where there's none when checking grubenv files
spanning multiple "blocks".
In checking that blocks don't overlap, the code has an if-statement that
appears to be accidentally negated ("if (s2 > s1)", should be "if (s1 >
s2)"), causing Grub to *always* report an error *unless* all blocks
overlap. Offending commit appears to be cb72aa1.
I can only assume that the only reason this hasn't been caught earlier
is that the grubenv file most commonly only consists of one Grub
"block"?
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https://bugs.launchpad.net/bugs/1311247
Title:
error: malformed file, press any key to continue
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