Re: Default enable RCU list lockdep debugging with PROVE_RCU

Paul E. McKenney
2020-05-17T21:47:18Z

On Fri, May 15, 2020 at 02:36:26PM -0400, Qian Cai wrote:
>
>
> > On May 14, 2020, at 2:13 PM, Paul E. McKenney <paulmck@kernel.org> wrote:
> >
> > Fair enough! And yes, the Linux kernel is quite large, so I certainly am
> > not asking you to test the whole thing yourself.
>
> Ok, I saw 0day bot also started to report those which is good. For example,
>
> lkml.org/lkml/2020/5/12/1358
>
> which so far is nit blocking 0day on linux-next since it does not use panic_on_warn yet (while syzbot does).
>
> Thus, I am more convinced that we should not revert the commit just for syzbot until someone could also convince 0day to select RCU_EXPERT and then DEBUG_RCU_LIST?

Let's ask the 0day people, now CCed, if they would be willing to
build with CONFIG_RCU_EXPERT=y and CONFIG_DEBUG_RCU_LIST=y on some
fraction of their testing. ;-)

Thanx, Paul