samba3 rpc code may leak talloc_stackframes which lets rpcclient -c epmapper panic on close.
Created attachment 9357 [details] patch for master
Fixed in d4a5c832f1806a9c664d52a34ea1a24eb370fa89..e2d6431cd4d3dee6a777e6c1063b42b8a0fa0cef in Samba 4.2