"0x000000C2" Stop error when read operation is performed over SMB 2.0 in Windows Server 2012

Applies to: Windows Server 2012 DatacenterWindows Server 2012 DatacenterWindows Server 2012 Standard


This issue may occur when you perform reading or transferring files on a Server Message Block (SMB) server that is running Windows Server 2012. Additionally, the Stop error message resembles the following:

STOP: 0x000000C2 (0x00000007, parameter2, parameter3, parameter4)

  • This Stop error indicates a BAD_POOL_CALLER issue.
  • The parameters after "0x00000007" in this Stop error message vary.
  • Not all "0x000000C2" Stop errors are caused by this issue.


This issue occurs because of a problem in the SMB file system driver when SMB 2.0 uses Fast I/O request for the read operations.


To resolve this issue, we have released a hotfix for Windows Server 2012. Even though this issue has only been observed in Windows Server 2012, the hotfix also applies to Windows 8.

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there is a "Hotfix Download Available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft website: Note The "Hotfix Download Available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.


There is no prerequisite to apply this hotfix.

Registry information

To use the hotfix in this package, you do not have to make any changes to the registry.

Restart requirement

You may have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.


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


See the terminology that Microsoft uses to describe software updates.