The problem is the bash function dep_add_modules_mount in /usr/share
/initramfs-tools/hook-functions which doesn't handle zfs.
By adding "MODULES=most" to /usr/share/initramfs-tools/conf-hooks.d/zfs,
the error goes away.
I'm still having trouble getting kdump to actually create a crash dump
with ZFS on root.
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upgrade of kernel fails with mkinitramfs: failed to determine device
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