/*      
 * Eviction cannot free overflow items once a checkpoint is
 * running in a tree: that can corrupt the checkpoint's block
 * management.  Assert that checkpoints aren't running to make 
 * sure we're catching all paths and to avoid regressions.
 */      
WT_ASSERT(session,
    S2BT(session)->checkpointing != WT_CKPT_RUNNING ||
    WT_SESSION_IS_CHECKPOINT(session));