Summary

The checkpoint() thread function in test/format/checkpoint.c opens a WT_SESSION at the top via wt_wrap_open_session and uses it throughout its loop. At function exit it calls wt_wrap_open_session again instead of wt_wrap_close_session, leaking the session opened at the start. Every other thread function in test/format/ (alter.c, compact.c, backup.c, etc.) correctly calls wt_wrap_close_session at exit. This is a copy/paste error.

Impact

Test-only resource leak; no production code affected.

File

• test/format/checkpoint.c

Fix

// test/format/checkpoint.c — end of checkpoint()
-wt_wrap_open_session(conn, &sap, NULL, NULL, &session);
+wt_wrap_close_session(session);
 return (WT_THREAD_RET_VALUE);

Notes

Discovered during development on the WT-16973 clean-scrub eviction branch (PR #13605). Fix is independent of that feature and should be applied directly to develop.