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From:Sebastien Darveau Date:February 6 2012 4:51pm
Subject:Segmentation Fault after upgrading to MySQL 5.5
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Hello,

I have recently upgraded from MySQL 5.0.77 to 5.5 and a few of my servers where the
program runs full time have crashed with a segmentation fault.  It takes some days to
happen and the multi-threaded program is running optimized in production environments so
I don't have a lot of information and it's hard to debug.

Is there a known incompatibility with newer versions of MySQL?

I've recompiled mysql++ 3.1.0 to link with libmysqlclient.so.18 and also recompiled my
program. All my threads are using:
mysqlpp::Connection::thread_start();

Interesting fact, MySQL 5.5 does not use a separated libmysqlclient_r.so library anymore
and the problem looks like a thread safety issue.  

I can see that in all cases, it happened in mysqlpp object's destructor (double delete?):

Server 1
---------
2012-02-06 05:56:15: [ERROR] Query error: Lost connection to MySQL server during query
2012-02-06 05:56:16: [ERROR]  1: 0x2b3f35e39a67 <+47550487042663>
(/usr/lib64/libmysqlclient.so.18)
2012-02-06 05:56:16: [ERROR]  2: 0x2b3f35e39e34 <my_net_read+420>
(/usr/lib64/libmysqlclient.so.18)
2012-02-06 05:56:16: [ERROR]  3: 0x2b3f35e33d8a <cli_safe_read+42>
(/usr/lib64/libmysqlclient.so.18)
2012-02-06 05:56:16: [ERROR]  4: 0x2b3f35e344f7 <+47550487020791>
(/usr/lib64/libmysqlclient.so.18)
2012-02-06 05:56:16: [ERROR]  5: 0x2b3f35e31ce6 <mysql_real_query+38>
(/usr/lib64/libmysqlclient.so.18)
2012-02-06 05:56:16: [ERROR]  6: 0x2b3f34f6fdab <mysqlpp::Query::use(char const*,
unsigned long)+123> (/usr/lib64/libmysqlpp.so.3)
2012-02-06 05:56:16: [ERROR]  7: 0x9bf238 <vtable for mysqlpp::Query+56>
(bin/GalaxieAudioEngine)
2012-02-06 05:56:16: [ERROR]  8: 0x563b60 <mysqlpp::Query::~Query()+0>
(bin/GalaxieAudioEngine)
2012-02-06 05:56:16: [ERROR] End of stack trace.

Server 2
---------
2012-02-04 02:35:25: [ERROR]  1: 0x2b57d6e9754d
<mysqlpp::Connection::~Connection()+45> (/usr/lib64/libmysqlpp.so.3)

Server 3
----------
2012-02-06 06:25:10: [ERROR]  1: 0x2b9634aaf185 <mysqlpp::DBDriver::~DBDriver()+85>
(/usr/lib64/libmysqlpp.so.3)


I use CentOS 5.6.

Thanks,
Sebastien Darveau
Thread
Segmentation Fault after upgrading to MySQL 5.5Sebastien Darveau6 Feb
  • RE: Segmentation Fault after upgrading to MySQL 5.5Sebastien Darveau7 Feb
    • RE: Segmentation Fault after upgrading to MySQL 5.5Dino Korah7 Feb
      • RE: Segmentation Fault after upgrading to MySQL 5.5Sebastien Darveau7 Feb
    • Re: Segmentation Fault after upgrading to MySQL 5.5Warren Young9 Feb