I could've sworn I already reported that, but it seems that migrate doesn't rollback the vhost properly when it fails to run update.php. The task log in #585106: Date module don't let my site migrate actually is a good example. This is a relatively trivial fix, i think.
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Comment #1
Anonymous (not verified) commentedFix committed. Simply add a
_provision_apache_create_vhost_config($url)todrush_provision_drupal_pre_provision_migrate_rollback()in migrate.provision.inc