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-rw-r--r--kernel/cpuset.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index cc0395d7eba..8c3c400cce9 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -1225,7 +1225,12 @@ static int attach_task(struct cpuset *cs, char *pidbuf, char **ppathbuf)
task_lock(tsk);
oldcs = tsk->cpuset;
- if (!oldcs) {
+ /*
+ * After getting 'oldcs' cpuset ptr, be sure still not exiting.
+ * If 'oldcs' might be the top_cpuset due to the_top_cpuset_hack
+ * then fail this attach_task(), to avoid breaking top_cpuset.count.
+ */
+ if (tsk->flags & PF_EXITING) {
task_unlock(tsk);
mutex_unlock(&callback_mutex);
put_task_struct(tsk);