__wt_tiered_tree_open() includes the following:
/*
* Set dhandle->handle with tiered tree structure, initialized.
*/
__wt_verbose(session, WT_VERB_TIERED, "TIERED_TREE_OPEN: Called %s", session->dhandle->name);
WT_ASSERT(session, session->dhandle != NULL);
These statements are in the wrong order. The ASSERT should come before we use sesson->dhandle in the call to __wt_verbose().