Import wiredtiger: 3a5e2b974eae2b5ebe2a7cc007b46aaea79516c0 from branch mongodb-master

ref: 94bdf27918..3a5e2b974e
for: 6.1.0-rc0

WT-9477       Fix a bug in checkpoint walk that leads to a corrupted internal tree

2 files changed, 10 insertions, 3 deletions

diff --git a/src/third_party/wiredtiger/import.data b/src/third_party/wiredtiger/import.data
index 3ef9ecfcc0c..431405508e2 100644
--- a/src/third_party/wiredtiger/import.data
+++ b/src/third_party/wiredtiger/import.data
@@ -2,5 +2,5 @@
     "vendor": "wiredtiger",
     "github": "wiredtiger/wiredtiger.git",
     "branch": "mongodb-master",
-    "commit": "94bdf27918b476e5d6bb8189984223e60992d828"
+    "commit": "3a5e2b974eae2b5ebe2a7cc007b46aaea79516c0"
 }
diff --git a/src/third_party/wiredtiger/src/btree/bt_split.c b/src/third_party/wiredtiger/src/btree/bt_split.c
index 2c6f8449e3c..1fd13c47fe0 100644
--- a/src/third_party/wiredtiger/src/btree/bt_split.c
+++ b/src/third_party/wiredtiger/src/btree/bt_split.c
@@ -1271,8 +1271,15 @@ __split_parent_climb(WT_SESSION_IMPL *session, WT_PAGE *page)
      * to a different part of the tree where it will be written; in other words, in one part of the
      * tree we'll skip the newly created insert split chunk, but we'll write it upon finding it in a
      * different part of the tree.
-     */
-    if (__wt_btree_syncing_by_other_session(session)) {
+     *
+     * Historically we allowed checkpoint itself to trigger an internal split here. That wasn't
+     * correct, since if that split climbs the tree above the immediate parent the checkpoint walk
+     * will potentially miss some internal pages. This is wrong as checkpoint needs to reconcile the
+     * entire internal tree structure. Non checkpoint cursor traversal doesn't care the internal
+     * tree structure as they just want to get the next leaf page correctly. Therefore, it is OK to
+     * split concurrently to cursor operations.
+     */
+    if (WT_BTREE_SYNCING(S2BT(session))) {
         __split_internal_unlock(session, page);
         return (0);
     }