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Index: vm_map.c
===================================================================
--- vm_map.c
+++ vm_map.c
@@ -2186,7 +2186,17 @@
VM_MAP_ASSERT_LOCKED(map);
KASSERT(entry->end > start && entry->start < start,
("_vm_map_clip_start: invalid clip of entry %p", entry));
- vm_map_simplify_entry(map, entry);
+ if ((entry->eflags & MAP_ENTRY_NOMERGE_MASK) == 0 &&
+ (vm_map_mergeable_neighbors(entry->prev, entry) ||
+ vm_map_mergeable_neighbors(entry, entry->next))) {
+ printf("%s: simplifying entry start %jx end %jx next_read %jx "
+ "max_free %jx eflags %jx object-type %d\n", __func__,
+ (uintmax_t)entry->start, (uintmax_t)entry->end,
+ (uintmax_t)entry->next_read, (uintmax_t)entry->max_free,
+ (uintmax_t)entry->eflags,
+ entry->object.vm_object ? entry->object.vm_object->type : -1);
+ vm_map_simplify_entry(map, entry);
+ }
/*
* Create a backing object now, if none exists, so that more individual

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