commit https://github.com/vim/vim/commit/107e1eef1df3b786ad3ad49fbdb9e058649303b5 Author: Bram Moolenaar <Bram@vim.org> Date: Fri Apr 8 17:07:19 2016 +0200 patch 7.4.1719 Problem: Leaking memory when there is a cycle involving a job and a partial. Solution: Add a copyID to job and channel. Set references in items referred by them. Go through all jobs and channels to find unreferenced items. Also, decrement reference counts when garbage collecting.

--- a/src/globals.h
+++ b/src/globals.h
@@ -1619,6 +1619,8 @@ EXTERN int  alloc_fail_countdown INIT(= 
 EXTERN int  alloc_fail_repeat INIT(= 0);
 
 EXTERN int  disable_char_avail_for_testing INIT(= 0);
+
+EXTERN int  in_free_unref_items INIT(= FALSE);
 #endif
 
 /*