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Article ID: 2688721 - Last Review: November 21, 2012 - Revision: 2.1

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If you have ever used more than 30 user-defined resource governor resource pools for an instance of Microsoft SQL Server 2012, you may be unable to connect to the instance of SQL Server 2012. Additionally, a minidump file is generated, and the following error message is logged in the SQL Server error log:
Non-yielding IOCP Listener


Cumulative update information

SQL Server 2012

The fix for this issue was first released in Cumulative Update 1. For more information about how to obtain this cumulative update package for SQL Server 2012, click the following article number to view the article in the Microsoft Knowledge Base:
2679368  ( ) Cumulative Update package 1 for SQL Server 2012
Note Because the builds are cumulative, each new fix release contains all the hotfixes and all the security fixes that were included with the previous SQL Server 2012 fix release. We recommend that you consider applying the most recent fix release that contains this hotfix. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
2692828  ( ) The SQL Server 2012 builds that were released after SQL Server 2012 was released


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More information

To check how many user-defined resource governor resource pools, run the following SQL query:
SELECT COUNT(*) FROM sys.dm_resource_governor_resource_pools WHERE pool_id >2
For more information about the sys.dm_resource_governor_resource_pools dynamic management view, visit the following Microsoft TechNet website:
sys.dm_resource_governor_resource_pools (Transact-SQL) (
For more information about the Resource Governor resource pool, visit the following website:
Resource Governor Resource Pool (
For more information about Resource Governor, visit the following website:
Resource Governor (

Applies to
  • Microsoft SQL Server 2012 Developer
  • Microsoft SQL Server 2012 Enterprise
  • Microsoft SQL Server 2012 Express
  • Microsoft SQL Server 2012 Standard
  • Microsoft SQL Server 2012 Web
  • Microsoft SQL Server 2012 Business Intelligence
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