[Bug 1657256] Re: Percona crashes when doing a a 'larger' update

[Jason Furmanek]

Jorge,
I tied this install now on Xenial, but am getting the same error about libevent being not installable:

2017-09-28 23:08:14 INFO install Some packages could not be installed. This may mean that you have
2017-09-28 23:08:14 INFO install requested an impossible situation or if you are using the unstable
2017-09-28 23:08:14 INFO install distribution that some required packages have not yet been created
2017-09-28 23:08:14 INFO install or been moved out of Incoming.
2017-09-28 23:08:14 INFO install The following information may help to resolve the situation:
2017-09-28 23:08:14 INFO install
2017-09-28 23:08:14 INFO install The following packages have unmet dependencies:
2017-09-28 23:08:14 INFO install  percona-xtradb-cluster-server-5.6 : Depends: libevent-2.1-6 (>= 2.1.8-stable) but it is not installable
2017-09-28 23:08:14 INFO install E: Unable to correct problems, you have held broken packages.


Xenial has libevent 2.0-5. Has this package been created properly for Xenial, or am I doing something dumb?

Thanks!

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Title:
  Percona crashes when doing a a 'larger' update

Status in OpenStack Charm Test Infra:
  Confirmed
Status in percona-xtradb-cluster-5.5 package in Ubuntu:
  Confirmed
Status in percona-xtradb-cluster-5.6 package in Ubuntu:
  In Progress
Status in percona-xtradb-cluster-5.5 source package in Trusty:
  Confirmed
Status in percona-xtradb-cluster-5.6 source package in Xenial:
  Confirmed
Status in percona-xtradb-cluster-5.6 source package in Zesty:
  Confirmed
Status in percona-xtradb-cluster-5.6 source package in Artful:
  In Progress

Bug description:
  [Impact]

   * Percona will segfault when exposed to medium load, almost imediately
   * This is because of a bug in upstream, which manifests only on PPC

  [Test Case]

   * Install and configure percona-xtradb-cluster-server
    * Run sysbench against configured node (only one node is needed, no need for proper cluster):
     # sysbench --test=oltp --oltp-test-mode=complex --max-time=60 --num-threads=110 run
   * mysqld will segfault seconds withing starting the test

  [Regression Potential]

   * This is a cherry-pick from an upstream fix (https://jira.mariadb.org/browse/MDEV-6450)
   * This is not fixed in upstream Percona becasue Percona does not officially support non-intel archs.
   * Because code adds additional memory barriers there was a chance of performance degradation on i386/amd64. However, intensive sysbench syntetic loads proved this is not the case - there are no performance penalties.

  [Other Info]

   *  percona-xtradb-cluster-5.5 is only available for Trusty.
  $ rmadison percona-xtradb-cluster-5.5
   percona-xtradb-cluster-5.5 | 5.5.34-25.9+dfsg-0ubuntu4          | trusty/universe          | source
   percona-xtradb-cluster-5.5 | 5.5.37-25.10+dfsg-0ubuntu0.14.04.1 | trusty-security/universe | source
   percona-xtradb-cluster-5.5 | 5.5.37-25.10+dfsg-0ubuntu0.14.04.2 | trusty-updates/universe  | source

  * See comment #22 for more context about other releases that offers percona-xtradb-cluster-5.6 : 
  https://bugs.launchpad.net/ubuntu/+source/percona-xtradb-cluster-5.5/+bug/1657256/comments/22

   * Upstream commit:
  https://github.com/MariaDB/server/commit/40497577ffd9f85557b15e08ad913f627b2e9530

  [Original Description]

  I'm trying to set up percona-xtradb-cluster-5.5 on PPC machine. While
  the package installs fine, as soon as I run sysbench oltp becnhmark
  against it, Percona dies (even when I start the benchmark with just
  one connection).

  I can also crash mysql manually, by updating the sbtest table (which
  is created by the sysbench utility):

  mysql> update sbtest set pad = 'mario1' limit 1000000;
  ERROR 2013 (HY000): Lost connection to MySQL server during query

  Sometimes I need to repeat this update (with different values for
  'pad' field) few times. This happens regardless of whether I run the
  UPDATE inside the transaction or not.

  This is the assertion found in the log file:

  170117 21:10:55 InnoDB: Assertion failure in thread 70366668321152 in file buf0buf.ic line 1277
  InnoDB: Failing assertion: block->page.buf_fix_count > 0

  This is a single-node percona-xtradb-cluster server, without
  wsrep_provied configured, run inside 14.04 lxc container on 16.04
  host.

  I'm attaching the full log file, mysql configuration file and the core
  dumped.

  The version of the package installed is this 5.5.37-25.10+dfsg-
  0ubuntu0.14.04.2.

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