[Bug 1654310] Re: lxcfs: update the 'btime' field in /proc/stat to reflect guest boot time not host

[Launchpad Bug Tracker]

This bug was fixed in the package lxcfs - 2.0.8-1ubuntu1

---
lxcfs (2.0.8-1ubuntu1) bionic; urgency=medium

  * Re-sync with Debian, remaining delta (for backports):
- Include upstart jobs on older Ubuntu releases
- Build-depend on dh-systemd with older debootstrap

 -- Stéphane Graber   Tue, 31 Oct 2017 18:40:42
-0400

** Changed in: lxcfs (Ubuntu)
   Status: Triaged => Fix Released

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Title:
  lxcfs: update the 'btime' field in /proc/stat to reflect guest boot
  time not host

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[Bug 1654310] Re: lxcfs: update the 'btime' field in /proc/stat to reflect guest boot time not host

[Serge Hallyn]

** Changed in: lxcfs (Ubuntu)
   Status: Fix Released => Triaged

** Changed in: lxcfs (Ubuntu Xenial)
   Status: Fix Released => Triaged

** Changed in: lxcfs (Ubuntu Yakkety)
   Status: Fix Released => Triaged

** Changed in: lxcfs (Ubuntu Zesty)
   Status: Fix Released => Triaged

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Title:
  lxcfs: update the 'btime' field in /proc/stat to reflect guest boot
  time not host

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[Bug 1654310] Re: lxcfs: update the 'btime' field in /proc/stat to reflect guest boot time not host

[Launchpad Bug Tracker]

This bug was fixed in the package lxcfs - 2.0.7-0ubuntu1~16.10.2

---
lxcfs (2.0.7-0ubuntu1~16.10.2) yakkety-proposed; urgency=medium

  * Cherrypick patch reverting the virtualization of bstat field (LP:
#1654310)

 -- Serge Hallyn   Tue, 04 Jul 2017 13:29:14
-0500

** Changed in: lxcfs (Ubuntu Yakkety)
   Status: Fix Committed => Fix Released

** Changed in: lxcfs (Ubuntu Zesty)
   Status: Fix Committed => Fix Released

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Title:
  lxcfs: update the 'btime' field in /proc/stat to reflect guest boot
  time not host

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[Bug 1654310] Re: lxcfs: update the 'btime' field in /proc/stat to reflect guest boot time not host

[Launchpad Bug Tracker]

This bug was fixed in the package lxcfs - 2.0.7-0ubuntu1~17.04.2

---
lxcfs (2.0.7-0ubuntu1~17.04.2) zesty-proposed; urgency=medium

  * Cherrypick patch reverting the virtualization of bstat field (LP:
#1654310)

 -- Serge Hallyn   Tue, 04 Jul 2017 13:29:40
-0500

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Title:
  lxcfs: update the 'btime' field in /proc/stat to reflect guest boot
  time not host

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[Bug 1654310] Re: lxcfs: update the 'btime' field in /proc/stat to reflect guest boot time not host

[Launchpad Bug Tracker]

This bug was fixed in the package lxcfs - 2.0.7-0ubuntu1~16.04.2

---
lxcfs (2.0.7-0ubuntu1~16.04.2) xenial-proposed; urgency=medium

  * Cherrypick patch reverting the virtualization of bstat field (LP:
#1654310)

 -- Serge Hallyn   Tue, 04 Jul 2017 10:43:18
-0500

** Changed in: lxcfs (Ubuntu Xenial)
   Status: Fix Committed => Fix Released

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Title:
  lxcfs: update the 'btime' field in /proc/stat to reflect guest boot
  time not host

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[Bug 1654310] Re: lxcfs: update the 'btime' field in /proc/stat to reflect guest boot time not host

[Brian Candler]

After upgrading to lxcfs/xenial-proposed (2.0.7-0ubuntu1~16.04.2), the
problem is fixed for me

Inside a container:

root@apt-cacher:~# ps auxwww | grep apt
apt-cac+   309  0.0  0.7 653476  7128 ?Ssl  Jul08   1:02 
/usr/sbin/apt-cacher-ng SocketPath=/run/apt-cacher-ng/socket -c 
/etc/apt-cacher-ng ForeGround=1
root  1922  0.0  0.1  14620  1016 ?S+   08:04   0:00 grep 
--color=auto apt
root@apt-cacher:~# date
Tue Jul 11 08:04:09 UTC 2017

- start time of apt-cacher-ng is correct (in the past)
- start time of 'grep' process is correct (current time)

** Tags removed: verification-needed-xenial
** Tags added: verification-done-xenial

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Title:
  lxcfs: update the 'btime' field in /proc/stat to reflect guest boot
  time not host

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[Bug 1654310] Re: lxcfs: update the 'btime' field in /proc/stat to reflect guest boot time not host

[Stéphane Graber]

Hello Jason, or anyone else affected,

Accepted lxcfs into xenial-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/lxcfs/2.0.7-0ubuntu1~16.04.2 in a
few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested and change the tag from
verification-needed-xenial to verification-done-xenial.If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-xenial. In either case, details of your
testing will help us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: lxcfs (Ubuntu Xenial)
   Status: New => Fix Committed

** Tags added: verification-needed verification-needed-xenial

** Changed in: lxcfs (Ubuntu Yakkety)
   Status: New => Fix Committed

** Tags added: verification-needed-yakkety

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Title:
  lxcfs: update the 'btime' field in /proc/stat to reflect guest boot
  time not host

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[Bug 1654310] Re: lxcfs: update the 'btime' field in /proc/stat to reflect guest boot time not host

[gozdal]

[Impact]

Processes within LXC container are seen as created in the future.

[Test Case]

1. create an LXC container on a host which has been up for untrivial amount of 
time (say 1 hour)
2. look at "ps aux" output in START column - all the process are seen as 
started in the future

[Regression Potential]

Software comparing process start time to any other time may fail in
unexpected ways. As an example some software compare process start time
to PID file timestamp on disk and disregard old PID files. In LXC this
code will disregard all PID files.

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Title:
  lxcfs: update the 'btime' field in /proc/stat to reflect guest boot
  time not host

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[Bug 1654310] Re: lxcfs: update the 'btime' field in /proc/stat to reflect guest boot time not host

[Serge Hallyn]

@gozdal,

would you be willing to add a SRU justification as per section 3.1 of
https://wiki.ubuntu.com/StableReleaseUpdates to the description of this
bug?

** Also affects: lxcfs (Ubuntu Xenial)
   Importance: Undecided
   Status: New

** Changed in: lxcfs (Ubuntu Xenial)
   Importance: Undecided => High

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Title:
  lxcfs: update the 'btime' field in /proc/stat to reflect guest boot
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[Bug 1654310] Re: lxcfs: update the 'btime' field in /proc/stat to reflect guest boot time not host

[Serge Hallyn]

I've pushed a package reverting that field to xenial-proposed - it will
await approval there.

I've set the priority to high as this seems to be affecting other
software adversely.

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Title:
  lxcfs: update the 'btime' field in /proc/stat to reflect guest boot
  time not host

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[Bug 1654310] Re: lxcfs: update the 'btime' field in /proc/stat to reflect guest boot time not host

[gozdal]

I believe that packages for several distributions (esp. Xenial) still
contain this now-revered patch. Would it be possible to release packages
with btime virtualization reverted?

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Title:
  lxcfs: update the 'btime' field in /proc/stat to reflect guest boot
  time not host

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Re: [Bug 1654310] Re: lxcfs: update the 'btime' field in /proc/stat to reflect guest boot time not host

[Christian Brauner]

On Mon, Jun 19, 2017 at 04:28:07PM -, Jason Baron wrote:
> Ok, I guess we could intercept the /proc//stat read() call and
> overwrite the starttime there with the correct value? That is, add the
> starttime from /proc//stat to the host boot time and then subtract
> that from the guest boot time.

We can't really do that since this is equivalent to over-mounting /proc itself.
Instead, we have reverted the "btime" virtualization patch for now and we'll
likely include this in the next round of SRUs.

> 
> -- 
> You received this bug notification because you are a member of Ubuntu
> containers team, which is subscribed to lxcfs in Ubuntu.
> Matching subscriptions: lxcfs
> https://bugs.launchpad.net/bugs/1654310
> 
> Title:
>   lxcfs: update the 'btime' field in /proc/stat to reflect guest boot
>   time not host
> 
> Status in lxcfs package in Ubuntu:
>   Fix Released
> 
> Bug description:
>   The 'btime' field in /proc/stat reflects the host boot time and not
>   the time that the guest container has started.
> 
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/lxcfs/+bug/1654310/+subscriptions

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Title:
  lxcfs: update the 'btime' field in /proc/stat to reflect guest boot
  time not host

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[Bug 1654310] Re: lxcfs: update the 'btime' field in /proc/stat to reflect guest boot time not host

[Jason Baron]

Ok, I guess we could intercept the /proc//stat read() call and
overwrite the starttime there with the correct value? That is, add the
starttime from /proc//stat to the host boot time and then subtract
that from the guest boot time.

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Title:
  lxcfs: update the 'btime' field in /proc/stat to reflect guest boot
  time not host

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Re: [Bug 1654310] Re: lxcfs: update the 'btime' field in /proc/stat to reflect guest boot time not host

[Christian Brauner]

On Mon, Jun 19, 2017 at 01:04:38PM -, gozdal wrote:
> This introduces a different problem: process creation time is counted as
> offset from btime:
> 
> (22) starttime  %llu
>   The time the process started after system boot.  In
>   kernels before Linux 2.6, this value was expressed
>   in jiffies.  Since Linux 2.6, the value is expressed
>   in clock ticks (divide by sysconf(_SC_CLK_TCK)).

Yes, we reverted that patch since we consider STTIME to be more
important.

> 
> (http://man7.org/linux/man-pages/man5/proc.5.html)
> 
> This means that because starttime is not virtualized, all the processes
> within the LXC container appear as time travellers from the future.
> 
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> You received this bug notification because you are a member of Ubuntu
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> https://bugs.launchpad.net/bugs/1654310
> 
> Title:
>   lxcfs: update the 'btime' field in /proc/stat to reflect guest boot
>   time not host
> 
> Status in lxcfs package in Ubuntu:
>   Fix Released
> 
> Bug description:
>   The 'btime' field in /proc/stat reflects the host boot time and not
>   the time that the guest container has started.
> 
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/lxcfs/+bug/1654310/+subscriptions

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Title:
  lxcfs: update the 'btime' field in /proc/stat to reflect guest boot
  time not host

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[Bug 1654310] Re: lxcfs: update the 'btime' field in /proc/stat to reflect guest boot time not host

[gozdal]

This introduces a different problem: process creation time is counted as
offset from btime:

(22) starttime  %llu
  The time the process started after system boot.  In
  kernels before Linux 2.6, this value was expressed
  in jiffies.  Since Linux 2.6, the value is expressed
  in clock ticks (divide by sysconf(_SC_CLK_TCK)).

(http://man7.org/linux/man-pages/man5/proc.5.html)

This means that because starttime is not virtualized, all the processes
within the LXC container appear as time travellers from the future.

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Title:
  lxcfs: update the 'btime' field in /proc/stat to reflect guest boot
  time not host

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[Bug 1654310] Re: lxcfs: update the 'btime' field in /proc/stat to reflect guest boot time not host

[Christian Brauner]

** Changed in: lxcfs (Ubuntu)
   Status: Triaged => Fix Released

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Title:
  lxcfs: update the 'btime' field in /proc/stat to reflect guest boot
  time not host

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[Bug 1654310] Re: lxcfs: update the 'btime' field in /proc/stat to reflect guest boot time not host

[Evgeni Golov]

This is fixed in LXCFS 2.0.7

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Title:
  lxcfs: update the 'btime' field in /proc/stat to reflect guest boot
  time not host

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[Bug 1654310] Re: lxcfs: update the 'btime' field in /proc/stat to reflect guest boot time not host

[Jason Baron]

I've created a pull request to address this issue:
https://github.com/lxc/lxcfs/pull/169

Thanks.

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Title:
  lxcfs: update the 'btime' field in /proc/stat to reflect guest boot
  time not host

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[Bug 1654310] Re: lxcfs: update the 'btime' field in /proc/stat to reflect guest boot time not host

[Serge Hallyn]

Thanks I've created https://github.com/lxc/lxcfs/issues/164 to track
this.

** Bug watch added: LXCFS bug tracker #164
   https://github.com/lxc/lxcfs/issues/164

** Changed in: lxcfs (Ubuntu)
   Importance: Undecided => Medium

** Changed in: lxcfs (Ubuntu)
   Status: New => Triaged

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Title:
  lxcfs: update the 'btime' field in /proc/stat to reflect guest boot
  time not host

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[Bug 1654310] Re: lxcfs: update the 'btime' field in /proc/stat to reflect guest boot time not host

[Dimitri John Ledkov]

** Package changed: make-dfsg (Ubuntu) => lxcfs (Ubuntu)

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Title:
  lxcfs: update the 'btime' field in /proc/stat to reflect guest boot
  time not host

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