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-rw-r--r--src/btree/bt_split.c32
1 files changed, 29 insertions, 3 deletions
diff --git a/src/btree/bt_split.c b/src/btree/bt_split.c
index 627e6b9cb48..92be2125b88 100644
--- a/src/btree/bt_split.c
+++ b/src/btree/bt_split.c
@@ -1256,12 +1256,12 @@ err: switch (complete) {
}
/*
- * __split_internal_lock --
+ * __split_internal_lock_worker --
* Lock an internal page.
*/
static int
-__split_internal_lock(WT_SESSION_IMPL *session, WT_REF *ref, bool trylock,
- WT_PAGE **parentp, bool *hazardp)
+__split_internal_lock_worker(WT_SESSION_IMPL *session,
+ WT_REF *ref, bool trylock, WT_PAGE **parentp, bool *hazardp)
{
WT_DECL_RET;
WT_PAGE *parent;
@@ -1340,6 +1340,32 @@ err: WT_PAGE_UNLOCK(session, parent);
}
/*
+ * __split_internal_lock --
+ * Lock an internal page.
+ */
+static int
+__split_internal_lock(WT_SESSION_IMPL *session,
+ WT_REF *ref, bool trylock, WT_PAGE **parentp, bool *hazardp)
+{
+ WT_DECL_RET;
+
+ /*
+ * There's no lock on our parent page and we're about to acquire one,
+ * which implies using the WT_REF.home field to reference our parent
+ * page. As a child of the parent page, we prevent its eviction, but
+ * that's a weak guarantee. If the parent page splits, and our WT_REF
+ * were to move with the split, the WT_REF.home field might change
+ * underneath us and we could race, and end up attempting to access
+ * an evicted page. Set the session page-index generation so if the
+ * parent splits, it still can't be evicted.
+ */
+ WT_WITH_PAGE_INDEX(session,
+ ret = __split_internal_lock_worker(
+ session, ref, trylock, parentp, hazardp));
+ return (ret);
+}
+
+/*
* __split_internal_unlock --
* Unlock the parent page.
*/