From: Stéphane Graber <stgraber@ubuntu.com>
Date: Mon, 24 Sep 2018 18:41:37 +0000 (-0400)
Subject: stop: Only freeze if freezer is available
X-Git-Tag: lxc-3.1.0~90^2
X-Git-Url: http://git.ipfire.org/gitweb/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F2645%2Fhead;p=thirdparty%2Flxc.git

stop: Only freeze if freezer is available

Closes #2644

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>
---

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;