Do you have the "NX" features of the amd64 turned on? If you're not sure, try booting with "noexec=off". If it works once you do that, then you're using NX, and that's causing grub to have some problems.
I would guess it is on. Using noexec=off the core dump is gone (using the same grub-0.96).
Let me know once you've tested it. If it is NX, I'll try to make the two patches we've got in the Fedora Core 4 tree suitable for upstream grub next week. It's probably not much work, just making sure it applies correctly and writing ChangeLog, etc. But it won't happen until at least next week, because the FC4 test 1 freeze is Monday.
If you have a patch or a new version, then I would be glad to test it.
Regards
Harri
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