[Bug 1427406] Re: data corruption on arm64

[dann frazier]

** Changed in: mysql-5.5 (Ubuntu Utopic)
       Status: New => In Progress

** Description changed:

  I've verified that the following MariaDB issue also impacts MySQL:
-   https://mariadb.atlassian.net/browse/MDEV-6615
- 
+   https://mariadb.atlassian.net/browse/MDEV-6615
  
  [Impact]
- Data corruption on arm64 (and maybe ppc64el?)
+ Data corruption on arm64 and ppc64el
  
  [Test Case]
  Reproducibility varies across SoCs but, at least on one SoC, it reliably fails within seconds with these sysbench commands:
  
  sysbench --num-threads=128 --max-requests=0 --max-time=1000 --test=oltp prepare
  sysbench --num-threads=128 --max-requests=0 --max-time=1000 --test=oltp run
  
  On failure, mysql will crash and sysbench will report a connection loss
  to the database.
  
  [Regression Risk]
  The fix touch some low level locking code, so there is always the risk that it introduces a problem on other platforms. However, this fix has been included in MariaDB since the 10.0.13 release in Aug, 2014 so it has had some real world testing.

** Summary changed:

- data corruption on arm64
+ data corruption on arm64 and ppc64el

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https://bugs.launchpad.net/bugs/1427406

Title:
  data corruption on arm64 and ppc64el

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