From ef2dff5c7a34b59630045fa9c72fd0e6e0a75bf8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Witold=20Kr=C4=99cicki?= <wpk@isc.org>
Date: Sun, 8 Dec 2019 21:14:08 +0100
Subject: [PATCH] pause and unpause netmgr in isc_nm_destroy to flush all
 events from worker queues

---
 lib/isc/netmgr/netmgr.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/lib/isc/netmgr/netmgr.c b/lib/isc/netmgr/netmgr.c
index 636c919730..0713aa42fc 100644
--- a/lib/isc/netmgr/netmgr.c
+++ b/lib/isc/netmgr/netmgr.c
@@ -337,6 +337,14 @@ isc_nm_destroy(isc_nm_t **mgr0) {
 	 * Wait for the manager to be dereferenced elsewhere.
 	 */
 	while (isc_refcount_current(&mgr->references) > 1) {
+		/*
+		 * Sometimes libuv gets stuck, pausing and unpausing
+		 * netmgr goes over all events in async queue for all
+		 * the workers, and since it's done only on shutdown it
+		 * doesn't cost us anything.
+		 */
+		isc_nm_pause(mgr);
+		isc_nm_resume(mgr);
 #ifdef WIN32
 		_sleep(1000);
 #else