membphis commented on issue #2745:
URL: https://github.com/apache/apisix/issues/2745#issuecomment-727228213
Needs to call the `checker:clear()` before we call the `stop` method.
Here is the bugfix patch, welcome PR:
```patch
diff --git a/apisix/balancer.lua b/apisix/balancer.lua
index 4eba0bbd..a9c0f3dc 100644
--- a/apisix/balancer.lua
+++ b/apisix/balancer.lua
@@ -106,6 +106,7 @@ local function create_checker(upstream,
healthcheck_parent)
if upstream.parent then
core.table.insert(upstream.parent.clean_handlers, function ()
core.log.info("try to release checker: ", tostring(checker))
+ checker:clear()
checker:stop()
end)
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