Health_check 0.02.09 expects /proc/timer_stats and cannot collect events

[Igor Ljubuncic]

== SRU Request BIONIC ==

== Justification ==

Newer kernels in Bionic don't support the older legacy /proc/timer_stats interface that health-check used to use. This was deprecated in health-check 0.03.00 onwards found in Cosmic+. Backport the removal of the /proc/timer_stats interface usage to Bionic's version of health-check to remove the /proc/timer_stats warning message.

== How to reproduce ==

Run health-check and one will see the error message, e.g.

sudo health-check pwd

"Cannot open /proc/timer_stats"

With the fix this error message does not occur.

== Regression Potential ==

These are backports of upstream health-check patches. They remove old redundant code and don't touch other health-check functionality; hence regression potential is small.

-----

Running health_check 0.02.09 results in the following error:

Cannot open /proc/timer_stats.

This struct does not exist:

ls: cannot access '/proc/timer_stats': No such file or directory

This on:

lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.2 LTS
Release: 18.04
Codename: bionic

Testing version 0.03.00 from git tip works correctly.

[Colin Ian King (colin-king)]

We required the following commit:

commit 7f61fdc66efdef15bd17f1f020d8ab63835243d2 (HEAD, refs/bisect/bad)
Author: Colin Ian King <email address hidden>
Date: Sat Jun 16 19:48:57 2018 +0100

    remove event metrics since newer kernels don't support this API

    Signed-off-by: Colin Ian King <email address hidden>

[Brian Murray (brian-murray)]

Hello Igor, or anyone else affected,

Accepted health-check into bionic-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/health-check/0.02.09-1ubuntu1 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-bionic to verification-done-bionic. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-bionic. In either case, without details of your testing we will not be able to proceed.

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

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

[Colin Ian King (colin-king)]

Verified with the -proposed health-check 0.02.09-1ubuntu1 on Ubuntu bionic amd64; the "Cannot open /proc/timer_stats" message no longer appears, so this is now fixed.

[Robie Basak (racb)]

The verification of the Stable Release Update for health-check has completed successfully and the package has now been released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.

[Launchpad Janitor (janitor)]

This bug was fixed in the package health-check - 0.02.09-1ubuntu1

---------------
health-check (0.02.09-1ubuntu1) bionic; urgency=medium

  * Remove trace events as this is no longer supported (LP: #1821181)
    - modern kernels don't support the sysfs interface so removing
      the trace event handlong the best way forward to avoid confusing
      error messages. Upstream commits:
    - 7f61fdc66efdef1 ("remove event metrics since newer kernels
      don't support this API")
    - 608913097b6de23 ("Remove events.h and references to timer stats")

 -- Colin King <email address hidden> Thu, 21 Mar 2018 16:15:14 +0000