[lxc-devel] [lxc/master] stop: Only freeze if freezer is available

[stgraber on Github]

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From d18d43da8955c327793c1b373c3abfee92f250ea Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?St=C3=A9phane=20Graber?= <stgraber at ubuntu.com>
Date: Mon, 24 Sep 2018 14:41:37 -0400
Subject: [PATCH] stop: Only freeze if freezer is available
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Closes #2644

Signed-off-by: Stéphane Graber <stgraber at ubuntu.com>
---
 src/lxc/commands.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/lxc/commands.c b/src/lxc/commands.c
index b83f1c4c4..09379dec9 100644
--- a/src/lxc/commands.c
+++ b/src/lxc/commands.c
@@ -654,6 +654,9 @@ static int lxc_cmd_stop_callback(int fd, struct lxc_cmd_req *req,
 		 * lxc_unfreeze() would do another cmd (GET_CGROUP) which would
 		 * deadlock us.
 		 */
+		if (cgroup_ops->get_cgroup(cgroup_ops, "freezer") == NULL)
+			return 0;
+
 		if (cgroup_ops->unfreeze(cgroup_ops))
 			return 0;