LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Alexey Gladkov <legion@kernel.org>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: "Ma, XinjianX" <xinjianx.ma@intel.com>,
	"linux-kselftest@vger.kernel.org"
	<linux-kselftest@vger.kernel.org>, lkp <lkp@intel.com>,
	"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
	"axboe@kernel.dk" <axboe@kernel.dk>,
	"christian.brauner@ubuntu.com" <christian.brauner@ubuntu.com>,
	"containers@lists.linux-foundation.org" 
	<containers@lists.linux-foundation.org>,
	"jannh@google.com" <jannh@google.com>,
	"keescook@chromium.org" <keescook@chromium.org>,
	"kernel-hardening@lists.openwall.com" 
	<kernel-hardening@lists.openwall.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	"oleg@redhat.com" <oleg@redhat.com>,
	"torvalds@linux-foundation.org" <torvalds@linux-foundation.org>
Subject: Re: [PATCH v11 5/9] Reimplement RLIMIT_MSGQUEUE on top of ucounts
Date: Wed, 18 Aug 2021 15:11:17 +0200	[thread overview]
Message-ID: <20210818131117.x7omzb2wkjq7le3s@example.org> (raw)
In-Reply-To: <87a6lgysxp.fsf@disp2133>

On Tue, Aug 17, 2021 at 10:47:14AM -0500, Eric W. Biederman wrote:
> "Ma, XinjianX" <xinjianx.ma@intel.com> writes:
> 
> > Hi Alexey,
> >
> > When lkp team run kernel selftests, we found after these series of patches, testcase mqueue: mq_perf_tests
> > in kselftest failed with following message.
> 
> Which kernel was this run against?
> 
> Where can the mq_perf_tests that you ran and had problems with be found?
> 
> During your run were you using user namespaces as part of your test
> environment?
> 
> The error message too many files corresponds to the error code EMFILES
> which is the error code that is returned when the rlimit is reached.
> 
> One possibility is that your test environment was run in a user
> namespace and so you wound up limited by rlimit of the user who created
> the user namespace at the point of user namespace creation. 
> 
> At this point if you can give us enough information to look into this
> and attempt to reproduce it that would be appreciated.

I was able to reproduce it on master without using user namespace.
I suspect that the maximum value is not assigned here [1]:

set_rlimit_ucount_max(&init_user_ns, UCOUNT_RLIMIT_MSGQUEUE, task_rlimit(&init_task, RLIMIT_MSGQUEUE));

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/kernel/fork.c#n832

> > If you confirm and fix the issue, kindly add following tag as appropriate
> > Reported-by: kernel test robot lkp@intel.com
> >
> > ```
> > # selftests: mqueue: mq_perf_tests
> > #
> > # Initial system state:
> > #       Using queue path:                       /mq_perf_tests
> > #       RLIMIT_MSGQUEUE(soft):                  819200
> > #       RLIMIT_MSGQUEUE(hard):                  819200
> > #       Maximum Message Size:                   8192
> > #       Maximum Queue Size:                     10
> > #       Nice value:                             0
> > #
> > # Adjusted system state for testing:
> > #       RLIMIT_MSGQUEUE(soft):                  (unlimited)
> > #       RLIMIT_MSGQUEUE(hard):                  (unlimited)
> > #       Maximum Message Size:                   16777216
> > #       Maximum Queue Size:                     65530
> > #       Nice value:                             -20
> > #       Continuous mode:                        (disabled)
> > #       CPUs to pin:                            3
> > # ./mq_perf_tests: mq_open() at 296: Too many open files
> > not ok 2 selftests: mqueue: mq_perf_tests # exit=1
> > ```    
> >
> > Test env:
> > rootfs: debian-10
> > gcc version: 9
> >
> > ------
> > Thanks 
> > Ma Xinjian
> 
> Eric
> 

-- 
Rgrds, legion


  reply	other threads:[~2021-08-18 13:11 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-17  4:03 Ma, XinjianX
2021-08-17 15:47 ` Eric W. Biederman
2021-08-18 13:11   ` Alexey Gladkov [this message]
2021-08-19  1:50     ` Ma, XinjianX
2021-08-19 15:10     ` Eric W. Biederman
2021-08-19 17:26       ` Alexey Gladkov
2021-08-23 21:06         ` [PATCH] ucounts: Fix regression preventing increasing of rlimits in init_user_ns Eric W. Biederman
2021-08-24  1:19           ` Ma, XinjianX
2021-08-24  3:24             ` Eric W. Biederman
  -- strict thread matches above, loose matches on Subject: below --
2021-04-22 12:27 [PATCH v11 0/9] Count rlimits in each user namespace legion
2021-04-22 12:27 ` [PATCH v11 5/9] Reimplement RLIMIT_MSGQUEUE on top of ucounts legion

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210818131117.x7omzb2wkjq7le3s@example.org \
    --to=legion@kernel.org \
    --cc=akpm@linux-foundation.org \
    --cc=axboe@kernel.dk \
    --cc=christian.brauner@ubuntu.com \
    --cc=containers@lists.linux-foundation.org \
    --cc=ebiederm@xmission.com \
    --cc=jannh@google.com \
    --cc=keescook@chromium.org \
    --cc=kernel-hardening@lists.openwall.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-kselftest@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=lkp@intel.com \
    --cc=oleg@redhat.com \
    --cc=torvalds@linux-foundation.org \
    --cc=xinjianx.ma@intel.com \
    --subject='Re: [PATCH v11 5/9] Reimplement RLIMIT_MSGQUEUE on top of ucounts' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).