linux-kernel - Re: CGroup Namespaces (v8)

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Date:	Fri, 1 Jan 2016 01:42:57 -0800
From:	Dan Williams <dan.j.williams@...el.com>
To:	"Serge E. Hallyn" <serge.hallyn@...ntu.com>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>, linux-api@...r.kernel.org,
	containers@...ts.linux-foundation.org,
	Johannes Weiner <hannes@...xchg.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	lxc-devel@...ts.linuxcontainers.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Tejun Heo <tj@...nel.org>, cgroups@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: CGroup Namespaces (v8)

On Fri, Jan 1, 2016 at 12:59 AM, Serge E. Hallyn
<serge.hallyn@...ntu.com> wrote:
> On Fri, Jan 01, 2016 at 12:19:44AM -0800, Dan Williams wrote:
>> On Tue, Dec 22, 2015 at 8:23 PM,  <serge.hallyn@...ntu.com> wrote:
>> > Hi,
>> >
>> > following is a revised set of the CGroup Namespace patchset which Aditya
>> > Kali has previously sent.  The code can also be found in the cgroupns.v8
>> > branch of
>> >
>> > https://git.kernel.org/cgit/linux/kernel/git/sergeh/linux-security.git/
>>
>> Happy New Year!
>>
>> I'm hitting both a build and boot regression in -next with these
>> patches.  The bisect log reports:
>>
>> git bisect skip f176ae3a5df610e0373c39538cc7744c7788b3df
>> # bad: [54b39d263704b66cc8006ce8f7dd4743fdabae70] cgroup: cgroup
>> namespace setns support
>> git bisect bad 54b39d263704b66cc8006ce8f7dd4743fdabae70
>> # good: [bf9b3590879afbaa54148d817ed68a0b51180375] sched: new clone
>> flag CLONE_NEWCGROUP for c
>> group namespace
>> git bisect good bf9b3590879afbaa54148d817ed68a0b51180375
>> # only skipped commits left to test
>> # possible first bad commit:
>> [54b39d263704b66cc8006ce8f7dd4743fdabae70] cgroup: cgroup namespa
>> ce setns support
>> # possible first bad commit:
>> [f176ae3a5df610e0373c39538cc7744c7788b3df] cgroup: introduce cgro
>> up namespaces
>>
>> Where compiling "f176ae3a5df6"  fails with:
>>
>> kernel/cgroup.c: In function ‘cgroupns_put’:
>> kernel/cgroup.c:5956:2: error: implicit declaration of function
>> ‘to_cg_ns’ [-Werror=implicit-f
>> unction-declaration]
>>  put_cgroup_ns(to_cg_ns(ns));
>
> Hi,
>
> is it possible you have a bad tree?

No, I don't believe so...

>  Looking at
> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/tree/kernel/cgroup.c?id=refs/tags/next-20151231
> to_cg_ns should definately be defined there.
>

Right, but it's not defined until commit 54b39d263704 "cgroup: cgroup
namespace setns support", however it is first used in the preceeding
commit f176ae3a5df6 "cgroup: introduce cgroup namespaces".  The bad
patch ordering breaks bisection.

Commit 54b39d263704 "cgroup: cgroup namespace setns support" not
booting is a separate issue.
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