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Index: contrib/jemalloc/src/extent.c
===================================================================
--- contrib/jemalloc/src/extent.c
+++ contrib/jemalloc/src/extent.c
@@ -1641,8 +1641,11 @@
}
/* Try to coalesce backward. */
- extent_t *prev = extent_lock_from_addr(tsdn, rtree_ctx,
- extent_before_get(extent), inactive_only);
+ extent_t *prev = NULL;
+ if (extent_before_get(extent) != NULL) {
+ prev = extent_lock_from_addr(tsdn, rtree_ctx,
+ extent_before_get(extent), inactive_only);
+ }
if (prev != NULL) {
bool can_coalesce = extent_can_coalesce(arena, extents,
extent, prev);

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