[Bug 1427406] [NEW] data corruption on arm64

[dann frazier]

Public bug reported:

I've verified that the following MariaDB issue also impacts MySQL:
  https://mariadb.atlassian.net/browse/MDEV-6615


[Impact]
Data corruption on arm64 (and maybe 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.

** Affects: mysql-5.6 (Ubuntu)
     Importance: Critical
         Status: Confirmed

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

Title:
  data corruption on arm64

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