Import wiredtiger: 4cf221a61f19db1ed706f923d18d3d0b507101c9 from branch mongodb-4.4r4.4.0-rc6

ref: 63b37d1861..4cf221a61f
for: 4.4.0-rc6

WT-5725       Remove the WT_CURSOR_BTREE.btree field
WT-6082       Skip writing txn-id to data store when not needed
WT-6088       Re-enable format-test
WT-6151       Perform an empty check on time window before performing visibility check
WT-6164       Reduce the number of page flags according to the flag variable size
WT-6169       Use helper functions to check time window's visibility
WT-6172       Fix silent failures of Evergreen test/format tasks
WT-6186       Only delete timestamped history store entries when seeing a non-timestamped tombstone
WT-6201       Release WT_CURSOR_BTREE buffers when caching a WT_CURSOR
WT-6205       Coverity analysis defect 114159: Redundant test
WT-6206       Coverity analysis defect 114158: Uninitialized pointer read
WT-6207       Coverity analysis defect 114156: PW.SET_BUT_NOT_USED
WT-6209       Coverity analysis defect 114135: Unintentional integer overflow
WT-6210       Coverity analysis defect 114134: Explicit null dereferenced

1 files changed, 3 insertions, 0 deletions

diff --git a/src/third_party/wiredtiger/src/cursor/cur_std.c b/src/third_party/wiredtiger/src/cursor/cur_std.c
index fd81465eb76..57a22a04aac 100644
--- a/src/third_party/wiredtiger/src/cursor/cur_std.c
+++ b/src/third_party/wiredtiger/src/cursor/cur_std.c
@@ -655,6 +655,9 @@ __wt_cursor_cache(WT_CURSOR *cursor, WT_DATA_HANDLE *dhandle)
     __wt_buf_free(session, &cursor->key);
     __wt_buf_free(session, &cursor->value);
 
+    /* Discard the underlying WT_CURSOR_BTREE buffers. */
+    __wt_btcur_cache((WT_CURSOR_BTREE *)cursor);
+
     /*
      * Acquire a reference while decrementing the in-use counter. After this point, the dhandle may
      * be marked dead, but the actual handle won't be removed.