Test for late run-shell on a client that has exited.

regress/control-client-run-shell-exit.sh

@@ -0,0 +1,38 @@
+#!/bin/sh
+
+# A waited run-shell command can complete after a control client has closed its
+# input and exited. The command queue still references the client until the job
+# callback runs, but control_stop has already destroyed c->control_state. Late
+# command output must be discarded instead of dereferencing the stopped control
+# state and killing the server.
+
+PATH=/bin:/usr/bin
+TERM=screen
+
+[ -z "$TEST_TMUX" ] && TEST_TMUX=$(readlink -f ../tmux)
+TMUX="$TEST_TMUX -Ltest"
+$TMUX kill-server 2>/dev/null
+
+OUT=$(mktemp)
+trap "$TMUX kill-server 2>/dev/null; rm -f $OUT" 0 1 15
+
+$TMUX -f/dev/null new-session -d -s main || exit 1
+
+printf '%s\n' 'run-shell "sleep 0.2; echo TEST"' |
+	$TMUX -f/dev/null -C >"$OUT" 2>&1
+
+sleep 1
+
+$TMUX has-session -t main 2>/dev/null || {
+	echo "server exited after late run-shell output"
+	cat "$OUT"
+	exit 1
+}
+
+grep -q '^%exit' "$OUT" || {
+	echo "control client did not exit"
+	cat "$OUT"
+	exit 1
+}
+
+exit 0