The BUG_ON() should be protected by freezer->lock, otherwise it
can be triggered easily when a task has been unfreezed but the
corresponding cgroup hasn't been changed to FROZEN state.
Signed-off-by: Li Zefan <[EMAIL PROTECTED]>
---
kernel/cgroup_freezer.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c
index e950569..7f54d1c 100644
--- a/kernel/cgroup_freezer.c
+++ b/kernel/cgroup_freezer.c
@@ -190,8 +190,9 @@ static void freezer_fork(struct cgroup_subsys *ss, struct
task_struct *task)
freezer = task_freezer(task);
task_unlock(task);
- BUG_ON(freezer->state == CGROUP_FROZEN);
spin_lock_irq(&freezer->lock);
+ BUG_ON(freezer->state == CGROUP_FROZEN);
+
/* Locking avoids race with FREEZING -> THAWED transitions. */
if (freezer->state == CGROUP_FREEZING)
freeze_task(task, true);
--
1.5.4.rc3
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