Import wiredtiger: 7b994a862e899a12eb7c3ac814c9fada7d8d1ab9 from branch mongodb-4.4

ref: 9bd1ece797..7b994a862e
for: 4.5.1

WT-4701       Switch test/format to use WiredTiger locking primitives
WT-5766       Separate out internal and shared transaction data
WT-5791       Prepare checkpoint can finish in 0msec and reset prepare min stat
WT-5794       Remove skew_newest option from reconciliation
WT-5833       Fix caching issue for overflow key/value items
WT-5919       Disallow logging archival testing with log-based incremental backup
WT-5946       Eviction server handles can deadlock when opening HS cursors
WT-5968       Make the WT_SESSION_IMPL.txn field an allocated structure
WT-5986       Create script for emulating multiversion tests
WT-6016       Fill source code comments where lines start with parentheticals
WT-6020       __rec_append_orig_value() cleanup
WT-6026       Fix s_all breakage on format.h

1 files changed, 3 insertions, 3 deletions

diff --git a/src/third_party/wiredtiger/src/lsm/lsm_work_unit.c b/src/third_party/wiredtiger/src/lsm/lsm_work_unit.c
index ad71a1ee3dd..ed4a5b43c4b 100644
--- a/src/third_party/wiredtiger/src/lsm/lsm_work_unit.c
+++ b/src/third_party/wiredtiger/src/lsm/lsm_work_unit.c
@@ -403,10 +403,10 @@ __wt_lsm_checkpoint_chunk(WT_SESSION_IMPL *session, WT_LSM_TREE *lsm_tree, WT_LS
      * Set read-uncommitted: we have already checked that all of the updates in this chunk are
      * globally visible, use the cheapest possible check in reconciliation.
      */
-    saved_isolation = session->txn.isolation;
-    session->txn.isolation = WT_ISO_READ_UNCOMMITTED;
+    saved_isolation = session->txn->isolation;
+    session->txn->isolation = WT_ISO_READ_UNCOMMITTED;
     ret = __wt_sync_file(session, WT_SYNC_WRITE_LEAVES);
-    session->txn.isolation = saved_isolation;
+    session->txn->isolation = saved_isolation;
     WT_ERR(ret);
 
     __wt_verbose(session, WT_VERB_LSM, "LSM worker checkpointing %s", chunk->uri);