o Require that the page queues lock is held on entry to vm_pageout_clean()

   and vm_pageout_flush().
 o Acquire the page queues lock before calling vm_pageout_clean()
   or vm_pageout_flush().

1 files changed, 2 insertions, 1 deletions

diff --git a/sys/vm/vm_object.c b/sys/vm/vm_object.c
index 20c6d75..25c53ec 100644
--- a/sys/vm/vm_object.c
+++ b/sys/vm/vm_object.c
@@ -850,7 +850,7 @@ vm_object_page_collect_flush(vm_object_t object, vm_page_t p, int curgeneration,
 			return(0);
 		}
 	}
-
+	vm_page_lock_queues();
 	maxf = 0;
 	for(i = 1; i < vm_pageout_page_count; i++) {
 		vm_page_t tp;
@@ -934,6 +934,7 @@ vm_object_page_collect_flush(vm_object_t object, vm_page_t p, int curgeneration,
 				maxf = i - maxb - 1;
 		}
 	}
+	vm_page_unlock_queues();
 	return(maxf + 1);
 }