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From:   "Liu, Chuansheng" <chuansheng.liu@intel.com>
To:     Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
CC:     "akpm@linux-foundation.org" <akpm@linux-foundation.org>,
        "pmladek@suse.com" <pmladek@suse.com>,
        "sergey.senozhatsky@gmail.com" <sergey.senozhatsky@gmail.com>,
        "rostedt@goodmis.org" <rostedt@goodmis.org>,
        "dvyukov@google.com" <dvyukov@google.com>,
        "penguin-kernel@I-love.SAKURA.ne.jp" 
        <penguin-kernel@i-love.sakura.ne.jp>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH] kernel/hung_task.c: force ignore_loglevel before panic
Thread-Topic: [PATCH] kernel/hung_task.c: force ignore_loglevel before panic
Thread-Index: AdSQSf5rRH8ZTwaTR0Kl+UXxB6vgiP//fUMA//93HeA=
Date:   Mon, 10 Dec 2018 05:58:02 +0000
Message-ID: <27240C0AC20F114CBF8149A2696CBE4A6015A8D9@SHSMSX101.ccr.corp.intel.com>
References: <27240C0AC20F114CBF8149A2696CBE4A6015A889@SHSMSX101.ccr.corp.intel.com>
 <20181210054622.GA6291@jagdpanzerIV>
In-Reply-To: <20181210054622.GA6291@jagdpanzerIV>
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> -----Original Message-----
> From: Sergey Senozhatsky [mailto:sergey.senozhatsky.work@gmail.com]
> Sent: Monday, December 10, 2018 1:46 PM
> To: Liu, Chuansheng <chuansheng.liu@intel.com>
> Cc: akpm@linux-foundation.org; pmladek@suse.com;
> sergey.senozhatsky@gmail.com; rostedt@goodmis.org; dvyukov@google.com;
> penguin-kernel@I-love.SAKURA.ne.jp; linux-kernel@vger.kernel.org
> Subject: Re: [PATCH] kernel/hung_task.c: force ignore_loglevel before panic
> 
> On (12/10/18 05:40), Liu, Chuansheng wrote:
> > @@ -130,6 +130,13 @@ static void check_hung_task(struct task_struct *t,
> unsigned long timeout)
> >                         init_utsname()->version);
> >                 pr_err("\"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\""
> >                         " disables this message.\n");
> > +               /* When sysctl_hung_task_panic is set, we have to force
> > +                * ignore_loglevel to get really useful hung task
> > +                * information.
> > +                */
> > +               if (sysctl_hung_task_panic && !ignore_loglevel)
> > +                       ignore_loglevel = true;
> 
> 		console_verbose()?

Thanks Sergey, it is really my need. I will prepare for a new version of patch:)