commit https://github.com/vim/vim/commit/b8d4905592fc26fcd09180d7d6bfefd899f2f6c6 Author: Bram Moolenaar <Bram@vim.org> Date: Sun May 1 14:22:16 2016 +0200 patch 7.4.1814 Problem: A channel may be garbage collected while it's still being used by a job. (James McCoy) Solution: Mark the channel as used if the job is still used. Do the same for channels that are still used.

--- a/src/eval.c
+++ b/src/eval.c
@@ -7024,6 +7024,7 @@ garbage_collect(int testing)
 
 #ifdef FEAT_JOB_CHANNEL
     abort = abort || set_ref_in_channel(copyID);
+    abort = abort || set_ref_in_job(copyID);
 #endif
 #ifdef FEAT_NETBEANS_INTG
     abort = abort || set_ref_in_nb_channel(copyID);