mysqld is not restarted after postinst runs mysql_upgrade

This bug was fixed in the package mysql-5.7 - 5.7.13-0ubuntu1

---------------
mysql-5.7 (5.7.13-0ubuntu1) yakkety; urgency=medium

  * Ubuntu merge from Debian VCS 1cdae6c. Remaining changes:
    - Revert "Build with libmecab-dev" since libmecab-dev is in
      universe.
  * Drop changes:
    - mysql-server-5.7: depend on apparmor (>= 2.10) for Trusty upgrade
      path (all upgrade paths go through Xenial; in hindsight this
      should have been a Breaks anyway).
    - Upstreamed to Debian:
      + d/p/allowemptyport.patch: update corresponding test
      + postinst: ignore mysql_upgrade's exit status 2
      + Export my_make_scrambled_password
      + Client commands in postinst should ignore custom config
      + Enable setting password for existing database if it was empty
      + Quote $rootpw correctly
      + Add libnuma-dev, libaio-dev to libmysqld-dev deps
      + d/p/fix-man-page-links.patch: drop (fixed upstream)
      + Add d/NEWS

mysql-5.7 (5.7.13-1~exp1) UNRELEASED; urgency=medium

  [ Robie Basak ]
  * Import upstream version 5.7.13.
  * Drop d/libmysqlclient18.lintian-overrides as the problem is genuine
    and should not be hidden. This addresses #812812 in part, but does
    not close it.
  * AppArmor profile refactoring and updates for 5.7.
  * Rename apport hook from 5.6 to 5.7.
  * debian/watch file update to 5.7.
  * d/rules: replace 5.6 with 5.7.
  * Drop libmysqld-pic.
  * d/rules: use dh_install --list-missing.
  * d/rules: some dh_install excludes.
  * d/rules: drop large set of comments.
  * d/rules configure: switch to INSTALL_LAYOUT=DEB.
  * d/rules configure: build WITH_INNODB_MEMCACHED.
  * d/rules configure: build with supplied boost.
  * d/rules configure: build with BUILD_CONFIG=mysql_release.
  * d/rules configure: drop SYSTEM_TYPE=.
  * d/rules: chmod changes.
  * mysqld.conf: move to non-deprecated name.
  * Rename debian/*5.6* to 5.7.
  * Adjust installation debian/additions/mysql-systemd-start.
  * Drop d/mysql-client-5.7.examples.
  * Drop some lintian overrides.
  * d/control: switch to 5.7.
  * libmysqlclient soname bump.
  * Update manpage formatting lintian overrides.
  * Drop d/p/fix-mysqlhotcopy-test-failure.patch.
  * Drop d/p/spelling.patch.
  * Drop d/p/fix_standalone_tests.patch.
  * Drop d/p/disable_tests.patch.
  * Drop d/p/scripts__mysqld_safe.sh__signals.patch.
  * Update Hurd and kFreeBSD patches.
  * Add d/p/fix-mtr-search-paths.patch.
  * Non-functional (documentation) 5.6->5.7 substitutions.
  * Drop comment from .install files.
  * Apport hook: install under new name.
  * mysql-testsuite-5.7 installation adjustments for 5.7.
  * Binary installation tweaks.
  * d/p/mysql-test-run-paths: adjust test suite for generic binary
    paths.
  * Move testsuite binaries to testsuite package.
  * Build with libmecab-dev.
  * Manpage changes for 5.7.
  * dep8 tests: s/5.6/5.7/.
  * dep8 test: adjust exclude list.
  * dep8 test: adjust test runner path.
  * dep8 test: fix typo (non-functional).
  * d/mysql-server-5.7.dirs: clean syntax.
  * TODO: d/copyright: misc updates for 5.7.
  * d/copyright: boost.
  * Mark scripts executable.
  * Drop gawk build dependency.
  * Add new MySQL 5.7 build de...

Uploaded to Xenial. SRU team: you may find it easier to review if you verify my uploaded delta is the same as https://git.launchpad.net/~racb/ubuntu/+source/mysql-5.7/log/?h=mysql-5.7/ubuntu/xenial and then use that.

Hello Robie, or anyone else affected,

Accepted mysql-5.7 into xenial-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/mysql-5.7/5.7.12-0ubuntu1.2 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 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 to verification-done. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed. 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!

To verify I took a trusty, installed mysql.
It has a few internal DBs by default, but to be sure I added a minimal DB.
mysql> SHOW DATABASES;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| testdb |
+--------------------+
Then I went for the upgrade.
Once as a check to Xenial and once for verification to Xenial-Proposed

Right after the DB upgrade with the container that runs proposed (and only in that one) in I got:
mysql stop/waiting
mysql start/running, process 9264
And things are running fine.
=> Verified

This bug was fixed in the package mysql-5.7 - 5.7.13-0ubuntu0.16.04.2

---------------
mysql-5.7 (5.7.13-0ubuntu0.16.04.2) xenial-security; urgency=medium

  * SECURITY UPDATE: Update to 5.7.13 to fix security issues (LP: #1604796)
    - http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
    - CVE-2016-3424
    - CVE-2016-3459
    - CVE-2016-3477
    - CVE-2016-3486
    - CVE-2016-3501
    - CVE-2016-3518
    - CVE-2016-3521
    - CVE-2016-3588
    - CVE-2016-3614
    - CVE-2016-3615
    - CVE-2016-5436
    - CVE-2016-5437
    - CVE-2016-5439
    - CVE-2016-5440
    - CVE-2016-5441
    - CVE-2016-5442
    - CVE-2016-5443
  * debian/patches/mysql-export-scramble.patch: removed, upstream.

 -- Marc Deslauriers <email address hidden> Wed, 20 Jul 2016 08:44:25 -0400