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Index: head/sys/vm/vm_object.c
===================================================================
--- head/sys/vm/vm_object.c
+++ head/sys/vm/vm_object.c
@@ -2169,10 +2169,11 @@
m = TAILQ_NEXT(m, listq);
}
if (vm_page_xbusied(tm)) {
- for (tobject = object; locked_depth > 1;
+ for (tobject = object; locked_depth >= 1;
locked_depth--) {
t1object = tobject->backing_object;
- VM_OBJECT_RUNLOCK(tobject);
+ if (tm->object != tobject)
+ VM_OBJECT_RUNLOCK(tobject);
tobject = t1object;
}
vm_page_busy_sleep(tm, "unwbo", true);

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