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	Index: head/contrib/jemalloc/src/extent.c
	===================================================================
	--- head/contrib/jemalloc/src/extent.c
	+++ head/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);