On Sat, 5 Mar 2022 at 06:27, Chengming Zhou <zhouchengming@xxxxxxxxxxxxx> wrote: > > On 2022/3/5 4:28 上午, Zhouyi Zhou wrote: > > Hi Paul > > > > Yes, your suggestion works! > > Thank you for your guidance, this is the first time I ever did a > > bisection, I gained greatly during this process! > > Hi Zhouyi, thanks for the bisection test. > Could this patch solve RCU warning? I just tested on my machine and there > is no RCU warning any more. This patch solves the reported problem. The test link provided below [1]. Tested-by: Linux Kernel Functional Testing <lkft@xxxxxxxxxx> > > diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h > index 1e356c222756..0d1ada8968d7 100644 > --- a/include/linux/cgroup.h > +++ b/include/linux/cgroup.h > @@ -450,6 +450,7 @@ extern struct mutex cgroup_mutex; > extern spinlock_t css_set_lock; > #define task_css_set_check(task, __c) \ > rcu_dereference_check((task)->cgroups, \ > + rcu_read_lock_sched_held() || \ > lockdep_is_held(&cgroup_mutex) || \ > lockdep_is_held(&css_set_lock) || \ > ((task)->flags & PF_EXITING) || (__c)) > -- Linaro LKFT https://lkft.linaro.org [1] https://lkft.validation.linaro.org/scheduler/job/4664565#L339
