As indicated in the comment above cgroup_css_sets_empty the
css_set_lock must be hold when calling it.
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
kernel/cgroup.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index c908354..59e711a 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -3980,7 +3980,10 @@ static int cgroup_rmdir(struct inode *unused_dir, struct dentry *dentry)
/* the vfs holds both inode->i_mutex already */
again:
mutex_lock(&cgroup_mutex);
- if (!cgroup_css_sets_empty(cgrp)) {
+ read_lock(&css_set_lock);
+ ret = cgroup_css_sets_empty(cgrp);
+ read_unlock(&css_set_lock);
+ if (!ret) {
mutex_unlock(&cgroup_mutex);
return -EBUSY;
}
--
1.8.0.2
--
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