linux-kernel - Re: Default enable RCU list lockdep debugging with PROVE

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Message-ID: <20200517214716.GT2869@paulmck-ThinkPad-P72>
Date:   Sun, 17 May 2020 14:47:16 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Qian Cai <cai@....pw>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Madhuparna Bhowmik <madhuparnabhowmik10@...il.com>,
        Amol Grover <frextrite@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>, philip.li@...el.com,
        lkp@...el.com, fengguang.wu@...el.com, rong.a.chen@...el.com
Subject: Re: Default enable RCU list lockdep debugging with PROVE_RCU

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@...nel.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