diff options
| -rw-r--r-- | kernel/cpuset.c | 7 |
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); |