LP:1020645 - crash (sig 11) with union query

Description

Hello and thanks for mariadb-5.3.7-Linux-x86_64.tar.gz,

Running on 2.6.18-274.7.1.el5 x86_64 x86_64 x86_64 GNU/Linux RedHat EL.

We recently upgraded some mysqld instances in a pool from MySQL 5.1.X to mariadb 5.3.7, we have had two crashes (on different instances on different hosts) with the same backtrace and very similar queries, the pool is a production pool so the priority has been restoration of service and a rollback, the query from the first backtrace did not cause a crash when run in isolation on our development and staging instances (I have not tested the 2nd yet), the development and staging instances do not have identical configurations, data or queries running, but are the same version (MariaDB 5.3.7) on the same OS on the same architecture. Oh, also both mariadb instances ran for several days days in production before crashing.

Here are the contents of the error log for the first crash (the backtrace is the same for the second crash and the query is very similar). I have removed the actual query reported and have included a representation of the query, I can send the actual query and table definitions privately.

I am wondering if (and hoping that) the backtrace looks familiar.

Thank you.

Environment

None

Assignee

Sergei Golubchik

Reporter

Peter (Stig) Edwards

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