diff options
| -rw-r--r-- | kernel/cgroup.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c index b2f203f25ec8..ad8eae5bb801 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -60,6 +60,7 @@ #include <linux/eventfd.h> #include <linux/poll.h> #include <linux/flex_array.h> /* used in cgroup_attach_proc */ +#include <linux/kthread.h> #include <linux/atomic.h> @@ -2225,6 +2226,18 @@ retry_find_task: if (threadgroup) tsk = tsk->group_leader; + + /* + * Workqueue threads may acquire PF_THREAD_BOUND and become + * trapped in a cpuset, or RT worker may be born in a cgroup + * with no rt_runtime allocated. Just say no. + */ + if (tsk == kthreadd_task || (tsk->flags & PF_THREAD_BOUND)) { + ret = -EINVAL; + rcu_read_unlock(); + goto out_unlock_cgroup; + } + get_task_struct(tsk); rcu_read_unlock(); |