XF 1.2 MySQL Deadlock

[Brent W]

On one of our forums I am having to do a lot of reorganizing. Every time I run the Batch Thread update I end up with one error like this:

Error Info
Zend_Db_Statement_Mysqli_Exception: Mysqli statement execute error : Deadlock found when trying to get lock; try restarting transaction - library/Zend/Db/Statement/Mysqli.php:214
Generated By: Unknown Account, 7 minutes ago
Stack Trace
#0 /home/mus37/public_html/library/Zend/Db/Statement.php(297): Zend_Db_Statement_Mysqli->_execute(Array)
#1 /home/mus37/public_html/library/Zend/Db/Adapter/Abstract.php(479): Zend_Db_Statement->execute(Array)
#2 /home/mus37/public_html/library/XenForo/Model/DataRegistry.php(164): Zend_Db_Adapter_Abstract->query('?????INSERT INT...', Array)
#3 /home/mus37/public_html/library/XenForo/Model/Deferred.php(150): XenForo_Model_DataRegistry->set('deferredRun', 1380753030)
#4 /home/mus37/public_html/library/XenForo/Model/Deferred.php(119): XenForo_Model_Deferred->updateNextDeferredTime()
#5 /home/mus37/public_html/library/XenForo/Application.php(1288): XenForo_Model_Deferred->defer('Cron', Array, 'cron', false, 1380753097)
#6 /home/mus37/public_html/library/XenForo/Deferred/Cron.php(12): XenForo_Application::defer('Cron', Array, 'cron', false, 1380753097)
#7 /home/mus37/public_html/library/XenForo/Model/Deferred.php(208): XenForo_Deferred_Cron->execute(Array, Array, 4.17693519592, 'Search Index (P...')
#8 /home/mus37/public_html/library/XenForo/Model/Deferred.php(331): XenForo_Model_Deferred->runDeferred(Array, 4.17693519592, 'Search Index (P...', false)
#9 /home/mus37/public_html/library/XenForo/Model/Deferred.php(284): XenForo_Model_Deferred->_runInternal(Array, NULL, 'Search Index (P...', false)
#10 /home/mus37/public_html/deferred.php(18): XenForo_Model_Deferred->run(false)
#11 {main}
Request State
array(3) {
  ["url"] => string(34) "http://3.7mustang.com/deferred.php"
  ["_GET"] => array(0) {
  }
  ["_POST"] => array(3) {
    ["_xfRequestUri"] => string(39) "/threads/orgasalarm-ww-language.236760/"
    ["_xfNoRedirect"] => string(1) "1"
    ["_xfResponseType"] => string(4) "json"
  }
}

 

[Mike]

Deadlocks can happen and a refresh is usually enough to fix it. However, I'm not seeing why it's happening here. I think the transactions are quite short and consistent so it shouldn't happen?

Can you paste the full output of this query?

SHOW ENGINE INNODB STATUS;

Is this seemingly happening every time you run the batch update? Or is it less consistent than that?