linux-kernel - Re: [PATCH] kernel/hung_task.c: Monitor killed tasks.

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Message-Id: <201905222346.x4MNkTqj073305@www262.sakura.ne.jp>
Date:   Thu, 23 May 2019 08:46:29 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Petr Mladek <pmladek@...e.com>, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "Paul E. McKenney" <paulmck@...ux.ibm.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Liu Chuansheng <chuansheng.liu@...el.com>,
        Valdis Kletnieks <valdis.kletnieks@...edu>,
        linux-kernel@...r.kernel.org, Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [PATCH] kernel/hung_task.c: Monitor killed tasks.

Andrew Morton wrote:
> On Thu, 23 May 2019 07:39:25 +1000 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> 
> > > I put an example patch into my subversion repository:
> > > 
> > >   svn checkout https://svn.osdn.net/svnroot/tomoyo/branches/syzbot-patches/
> > > 
> > > To fetch up-to-date debug printk() patches:
> > > 
> > >   cd syzbot-patches
> > >   svn update
> > > 
> > > Does this work for you?
> > 
> > Neither will fit into my normal workflow.
> > 
> > So, tell me, what are you trying to do?  What does you work depend on?
> > Just Linus' tree, or something already in linux-next?  Why would you
> > want to keep moving your patch(es) on top of linux-next?

"[PATCH] printk: Monitor change of console loglevel." is targeted for
linux-next only, and I estimate that this patch will be removed in a
week or so, for syzbot can reproduce this problem using linux-next and
syzbot will blacklist testcases causing this problem.

"[PATCH] kernel/hung_task.c: Monitor killed tasks." is targeted for upstream, for
syzbot is hitting this problem in any tree and this will be a kernel's problem.
But for feasibility check, for now I want to try this patch on only linux-next.
I guess we need to tune (e.g. add sysctl) before sending to linux.git tree.

I am seeking for an approach which is less burden for both of you. But it
seems that using Andrew's route seems to fit better for Stephen's workflow.

> 
> um, I can carry developer-only linux-next debug patches.
> 

OK. Then, will you carry these patches?

Regards.