Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
MIME-Version: 1.0
References: <cover.1593530334.git.vpillai@digitalocean.com>
 <c783b3890b6df669a72c7c4a3012950d009b8034.1593530334.git.vpillai@digitalocean.com>
 <ed837e01-043b-e19b-293c-30d44df6f3a8@linux.intel.com>
In-Reply-To: <ed837e01-043b-e19b-293c-30d44df6f3a8@linux.intel.com>
From:   Vineeth Remanan Pillai <vpillai@digitalocean.com>
Date:   Fri, 10 Jul 2020 09:36:42 -0400
Message-ID: <CANaguZArdu1Jz3SvogFSXhnqmbdKX5aAORmGMf_uc+J=UQZpJw@mail.gmail.com>
Subject: Re: [RFC PATCH 14/16] irq: Add support for core-wide protection of
 IRQ and softirq
To:     "Li, Aubrey" <aubrey.li@linux.intel.com>
Cc:     Nishanth Aravamudan <naravamudan@digitalocean.com>,
        Julien Desfossez <jdesfossez@digitalocean.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Tim Chen <tim.c.chen@linux.intel.com>,
        Ingo Molnar <mingo@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Paul Turner <pjt@google.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        "Joel Fernandes (Google)" <joel@joelfernandes.org>,
        Linux List Kernel Mailing <linux-kernel@vger.kernel.org>,
        Subhra Mazumdar <subhra.mazumdar@oracle.com>,
        =?UTF-8?B?RnLDqWTDqXJpYyBXZWlzYmVja2Vy?= <fweisbec@gmail.com>,
        Kees Cook <keescook@chromium.org>,
        Greg Kerr <kerrnel@google.com>, Phil Auld <pauld@redhat.com>,
        Aaron Lu <aaron.lwe@gmail.com>,
        Aubrey Li <aubrey.intel@gmail.com>,
        Valentin Schneider <valentin.schneider@arm.com>,
        Mel Gorman <mgorman@techsingularity.net>,
        Pawan Gupta <pawan.kumar.gupta@linux.intel.com>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Joel Fernandes <joelaf@google.com>,
        Vineeth Pillai <vineethrp@gmail.com>,
        Chen Yu <yu.c.chen@intel.com>,
        Christian Brauner <christian.brauner@ubuntu.com>,
        Tim Chen <tim.c.chen@intel.com>,
        "Paul E . McKenney" <paulmck@kernel.org>
Content-Type: text/plain; charset="UTF-8"
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Hi Aubrey,

On Fri, Jul 10, 2020 at 8:19 AM Li, Aubrey <aubrey.li@linux.intel.com> wrote:
>
> Hi Joel/Vineeth,
> [...]
> The problem is gone when we reverted this patch. We are running multiple
> uperf threads(equal to cpu number) in a cgroup with coresched enabled.
> This is 100% reproducible on our side.
>
> Just wonder if anything already known before we dig into it.
>
Thanks for reporting this. We haven't seen any lockups like this
in our testing yet.

Could you please add more information on how to reproduce this?
Was it a simple uperf run without any options or was it running any
specific kind of network test?

We shall also try to reproduce this and investigate.

Thanks,
Vineeth