New subject: [Issue 10396] LMDB: another issue with sorted duplicate DBs and cursor delete

6 Oct 2025


      https://bugs.openldap.org/show_bug.cgi?id=10396
Issue ID: 10396
           Summary: LMDB: another issue with sorted duplicate DBs and
                    cursor delete
           Product: LMDB
           Version: 0.9.19
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Keywords: needs_review
          Severity: normal
          Priority: ---
         Component: liblmdb
          Assignee: bugs@openldap.org
          Reporter: hyc@openldap.org
  Target Milestone: ---
In mdb_cursor_del0, in the second "Adjust other cursors" section (after
mdb_rebalance was called), in these lines
if (m3->mc_xcursor && !(m3->mc_flags & C_EOF)) {
                    MDB_node *node = NODEPTR(m3->mc_pg[m3->mc_top],
m3->mc_ki[m3->mc_top]);
The node being referenced should be using mc->mc_top, not m3->mc_top. Most of
the time these will be identical, but sometimes due to rebalancing, the mc
cursor may be popped below its stack top when calling here.
This bug was introduced for ITS#8406 in commit
37081325f7356587c5e6ce4c1f36c3b303fa718c on 2016-04-18.
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[Issue 10396] New: LMDB: another issue with sorted duplicate DBs and cursor delete