---

yaml --- r: 304801 b: refs/heads/master c: c4c27fb h: refs/heads/master i: 304799: 991e46a v: v3
git-mirror · Apr 23, 2012 · 1e7ff31 · 1e7ff31
1 parent 6c46055
commit 1e7ff31
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Showing 2 changed files with 14 additions and 1 deletion.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 86f82d561864e902c70282b6f17cf590c0f34691
+refs/heads/master: c4c27fbdda4e8ba87806c415b6d15266b07bce4b
diff --git a/trunk/kernel/cgroup.c b/trunk/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 @@ static int attach_task_by_pid(struct cgroup *cgrp, u64 pid, bool threadgroup)
 
 	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();