https://github.com/vim-jp/issues/issues/1057#issuecomment-318244326

fix-term-segv.patch

diff --git a/src/eval.c b/src/eval.c
index 401171c9b..4cb32893f 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -5329,6 +5329,10 @@ garbage_collect(int testing)
     abort = abort || set_ref_in_quickfix(copyID);
 #endif
 
+#ifdef FEAT_TERMINAL
+    abort = abort || set_ref_in_term(copyID);
+#endif
+
     if (!abort)
     {
 	/*
diff --git a/src/proto/terminal.pro b/src/proto/terminal.pro
index d7d153850..ac0beb51d 100644
--- a/src/proto/terminal.pro
+++ b/src/proto/terminal.pro
@@ -6,4 +6,5 @@ void terminal_loop(void);
 void term_job_ended(job_T *job);
 void term_update_window(win_T *wp);
 char_u *term_get_status_text(term_T *term);
+int set_ref_in_term(int copyID);
 /* vim: set ft=c : */
diff --git a/src/terminal.c b/src/terminal.c
index 0532d01f9..3874564d4 100644
--- a/src/terminal.c
+++ b/src/terminal.c
@@ -1241,6 +1241,7 @@ term_and_job_init(term_T *term, int rows, int cols, char_u *cmd)
     job->jv_proc_info.dwProcessId = GetProcessId(child_process_handle);
     job->jv_job_object = jo;
     job->jv_status = JOB_STARTED;
+    ++job->jv_refcount;
     term->tl_job = job;
 
     return OK;
@@ -1320,6 +1321,8 @@ term_and_job_init(term_T *term, int rows, int cols, char_u *cmd)
     argvars[0].vval.v_string = cmd;
     setup_job_options(&opt, rows, cols);
     term->tl_job = job_start(argvars, &opt);
+    if (term->tl_job != NULL)
+	++term->tl_job->jv_refcount;
 
     return term->tl_job != NULL
 	&& term->tl_job->jv_channel != NULL
@@ -1359,6 +1362,28 @@ term_report_winsize(term_T *term, int rows, int cols)
     }
 }
 
+/*
+ * Mark references in jobs of terminals.
+ */
+    int
+set_ref_in_term(int copyID)
+{
+    int		abort = FALSE;
+    term_T	*term;
+    typval_T	tv;
+
+    for (term = first_term; term != NULL; term = term->tl_next)
+    {
+	if (term->tl_job != NULL)
+	{
+	    tv.v_type = VAR_JOB;
+	    tv.vval.v_job = term->tl_job;
+	    abort = abort || set_ref_in_item(&tv, copyID, NULL, NULL);
+	}
+    }
+    return abort;
+}
+
 # endif
 
 #endif /* FEAT_TERMINAL */