new file mode 100644
--- /dev/null
+++ b/http_resolver_cleanup.t
@@ -0,0 +1,108 @@
+#!/usr/bin/perl
+
+# (C) Sergey Kandaurov
+# (C) Nginx, Inc.
+
+# Tests for http resolver, worker process termination.
+
+###############################################################################
+
+use warnings;
+use strict;
+
+use Test::More;
+
+BEGIN { use FindBin; chdir($FindBin::Bin); }
+
+use lib 'lib';
+use Test::Nginx;
+
+###############################################################################
+
+select STDERR; $| = 1;
+select STDOUT; $| = 1;
+
+my $t = Test::Nginx->new()->has(qw/http proxy/)->plan(1);
+
+$t->write_file_expand('nginx.conf', <<'EOF');
+
+%%TEST_GLOBALS%%
+
+daemon off;
+
+events {
+}
+
+http {
+    %%TEST_GLOBALS_HTTP%%
+
+    server {
+        listen       127.0.0.1:8080;
+        server_name  localhost;
+
+        location / {
+            resolver 127.0.0.1:%%PORT_8081_UDP%%;
+            proxy_pass http://example.net/$args;
+        }
+
+        location /pid {
+            add_header X-Pid $pid always;
+        }
+    }
+}
+
+EOF
+
+$t->run_daemon(\&dns_daemon, $t);
+$t->run()->waitforfile($t->testdir . '/' . port(8081));
+
+###############################################################################
+
+my ($s);
+
+TODO: {
+todo_skip 'use-after-free', 1 unless $ENV{TEST_NGINX_UNSAFE}
+	or $t->has_version('1.11.8');
+
+# truncated UDP response, no response over TCP
+
+$s = http_get('/', start => 1);
+
+pass('request');
+
+sleep 1;
+
+}
+
+# use-after-free in worker on fast shutdown
+
+http_get('/pid') =~ qr/X-Pid: (\d+)/;
+kill 'TERM', $1;
+
+###############################################################################
+
+sub dns_daemon {
+	my ($t) = @_;
+	my ($data);
+
+	my $socket = IO::Socket::INET->new(
+		LocalAddr => '127.0.0.1',
+		LocalPort => port(8081),
+		Proto => 'udp',
+	)
+		or die "Can't create UDP socket: $!\n";
+
+	# signal we are ready
+
+	open my $fh, '>', $t->testdir() . '/' . port(8081);
+	close $fh;
+
+	while (1) {
+		$socket->recv($data, 65536);
+		# truncation bit set
+		$data |= pack("n2", 0, 0x8380);
+		$socket->send($data);
+	}
+}
+
+###############################################################################