linux-kernel - Re: [PATCH v10 6/9] kselftests: cgroup: add freezer controller self-tests

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Message-ID: <20190718181904.GD6139@castle.dhcp.thefacebook.com>
Date:   Thu, 18 Jul 2019 18:19:10 +0000
From:   Roman Gushchin <guro@...com>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
CC:     Roman Gushchin <guroan@...il.com>, Tejun Heo <tj@...nel.org>,
        "Oleg Nesterov" <oleg@...hat.com>,
        Kernel Team <Kernel-team@...com>,
        "cgroups@...r.kernel.org" <cgroups@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Shuah Khan <shuah@...nel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        "lkft-triage@...ts.linaro.org" <lkft-triage@...ts.linaro.org>
Subject: Re: [PATCH v10 6/9] kselftests: cgroup: add freezer controller
 self-tests

On Wed, Jul 17, 2019 at 02:26:49PM +0530, Naresh Kamboju wrote:
> Hi Roman,
> 
> > The interaction between ptrace and freezer is complicated
> > (as ptrace in general),so there are known cases when spurious
> > cgroup transitions (frozen <-> non frozen <-> frozen ) can happen.
> 
> When test ran for 8 times it got failed 5 times.
> I have noticed intermittent failure on x86_64, arm64 hikey device and
> qemu_arm64.

Oh, it wasn't nearly as bad when I ran it. I'll take a look.

> 
> >
> > Does it create any difficulties? If so, I'll send a diff to ignore
> > the result of this test for now.
> 
> No difficulties. I will mark this test case as known failure.

Sure.

Thanks!