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Subject: Re: [RFC][PATCH 00/16] sched: Core scheduling
To:     Aubrey Li <aubrey.intel@gmail.com>
Cc:     Mel Gorman <mgorman@techsingularity.net>,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Paul Turner <pjt@google.com>,
        Tim Chen <tim.c.chen@linux.intel.com>,
        Linux List Kernel Mailing <linux-kernel@vger.kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Fr?d?ric Weisbecker <fweisbec@gmail.com>,
        Kees Cook <keescook@chromium.org>,
        Greg Kerr <kerrnel@google.com>
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From:   Subhra Mazumdar <subhra.mazumdar@oracle.com>
Message-ID: <19d5d492-a4c1-b3c8-cae4-da2fdfcb872b@oracle.com>
Date:   Mon, 11 Mar 2019 11:34:04 -0700
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On 3/10/19 9:23 PM, Aubrey Li wrote:
> On Sat, Mar 9, 2019 at 3:50 AM Subhra Mazumdar
> <subhra.mazumdar@oracle.com> wrote:
>> expected. Most of the performance recovery happens in patch 15 which,
>> unfortunately, is also the one that introduces the hard lockup.
>>
> After applied Subhra's patch, the following is triggered by enabling
> core sched when a cgroup is
> under heavy load.
>
It seems you are facing some other deadlock where printk is involved. 
Can you
drop the last patch (patch 16 sched: Debug bits...) and try?

Thanks,
Subhra