ITS#8062 fix rebalance

(Probably fixes the ITS, definitely fixes a bug) when collapsing
the root page, fixups of other cursors was incomplete.

diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c
index cfce8a1..36898d6 100644 (file)
--- a/libraries/liblmdb/mdb.c
+++ b/libraries/liblmdb/mdb.c
@@ -7837,12 +7837,12 @@ mdb_rebalance(MDB_cursor *mc)
                                                m3 = m2;
                                        if (m3 == mc || m3->mc_snum < mc->mc_snum) continue;
                                        if (m3->mc_pg[0] == mp) {
-                                               m3->mc_snum--;
-                                               m3->mc_top--;
                                                for (i=0; i<m3->mc_snum; i++) {
                                                        m3->mc_pg[i] = m3->mc_pg[i+1];
                                                        m3->mc_ki[i] = m3->mc_ki[i+1];
                                                }
+                                               m3->mc_snum--;
+                                               m3->mc_top--;
                                        }
                                }
                        }
@@ -7912,7 +7912,11 @@ mdb_rebalance(MDB_cursor *mc)
                } else {
                        oldki += NUMKEYS(mn.mc_pg[mn.mc_top]);
                        mn.mc_ki[mn.mc_top] += mc->mc_ki[mn.mc_top] + 1;
+                       /* We want mdb_rebalance to find mn when doing fixups */
+                       mn.mc_next = mc->mc_txn->mt_cursors[mc->mc_dbi];
+                       mc->mc_txn->mt_cursors[mc->mc_dbi] = &mn;
                        rc = mdb_page_merge(mc, &mn);
+                       mc->mc_txn->mt_cursors[mc->mc_dbi] = mn.mc_next;
                        mdb_cursor_copy(&mn, mc);
                }
                mc->mc_flags &= ~C_EOF;