According to your last comment and taking into account that XEN is not
being actively supported in Ubuntu i'm marking as WON'T FIX.
However, this seems like the same bug #252977 so your workaround could
help there too.
** Changed in: linux (Ubuntu)
Status: New => Won't Fix
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xen boot error page_mapcount negative
https://bugs.launchpad.net/bugs/288924
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