Samba needs the hdb plugin updated to support hdb version 8. Heimdal needs the hdb callback function patched because even when the plugin is registered properly, it segfaults because the pointer is never set properly in _krb5_plugin_run_f. Looks like the plugin code was recently updated but never tested for hdb plugins. So basically heimdal segfault's when running any registered hdb plugin. Probably a test should be written.
Anyway, I'm attaching patches here for both heimdal and samba. I can submit debug backtraces if anyone is interested.
samba-26_heimdal_compat.patch
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heimdal-fix_hdb_plugin.patch
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