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Subject: Re: kernel freeze when running docker
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From: Vignesh Raman <vignesh.raman.in@gmail.com>
Message-ID: <7f76ebbb-956f-1685-6663-1363d3039e78@gmail.com>
Date: Fri, 24 Aug 2018 12:11:18 +0530
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Sender: linux-rt-users-owner@vger.kernel.org
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To: Julia Cartwright <julia@ni.com>
Cc: linux-rt-users@vger.kernel.org

Hi Julia,

On Wednesday 22 August 2018 10:12 PM, Julia Cartwright wrote:
> I never explicitly asked...have you tried a similar test on a non-RT
> kernel?  Does it exhibit the same behavior?  The linked moby github
> issue would seem to indicate this isn't RT specific...

Yes I tried the tests on non-RT kernel and the issue was not reproduced
with 14 hours of testing with docker running kubernetes. I also tested
with the test case mentioned in moby github issue and the kernel freeze
was not seen. Config file is https://paste.debian.net/1039104/

root@debian:~# uname -a
Linux debian 4.9.0-6-amd64 #1 SMP Debian 4.9.82-1+deb9u3 (2018-03-02)
x86_64 GNU/Linux

> Can you send your full config?  If I get some time to try it, I'd like
> to see if I can reproduce your issue.

Thanks. Config file is https://paste.debian.net/1039103/ (output of
'grep "=[y|m]" config-4.14.59-rt37')
This issue was reproduced with 4.9.0-6-rt-amd64 kernel also.

root@debian:~# uname -a
Linux debian 4.14.59-rt37 #1 SMP PREEMPT RT Fri Aug 24 00:31:29 UTC 2018
x86_64 GNU/Linux

Below are the steps to reproduce the issue,
Install docker using,
curl
https://raw.githubusercontent.com/rancher/install-docker/master/17.03.2.sh
| /bin/bash

Run
"for f in $(seq 1 10000);do docker run -it --rm ubuntu echo $f; done"
consecutively in 3 terminals.

The freeze/lockup occurs sporadically.

The other test case is to run docker with kubernetes.

Regards,
Vignesh