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-rw-r--r--sys/vm/vm_pageout.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/sys/vm/vm_pageout.c b/sys/vm/vm_pageout.c
index 6da486e..a76aaa5 100644
--- a/sys/vm/vm_pageout.c
+++ b/sys/vm/vm_pageout.c
@@ -786,7 +786,8 @@ rescan0:
*/
if (object->ref_count == 0) {
vm_page_flag_clear(m, PG_REFERENCED);
- pmap_clear_reference(m);
+ KASSERT(!pmap_page_is_mapped(m),
+ ("vm_pageout_scan: page %p is mapped", m));
/*
* Otherwise, if the page has been referenced while in the
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