Under high load with 16 or more processors and many I/O failures, Windows 8.1 or Windows Server 2012 R2 virtual machines crash, which is caused by Stop error in vhdmp.sys. To resolve this issue, install update 2919355.

Fixes an issue in which you cannot create a virtual hard disk on a remote server share in Windows 8.1, Windows Server 2012 R2, Windows 8, or Windows Server 2012. This issue occurs if the SMB Service does not support resiliency.

Under high load with 16 or more processors and many I/O failures, Windows 8.1 or Windows Server 2012 R2 virtual machines crash, which is caused by Stop error in vhdmp.sys. To resolve this issue, install update 2919355.

When you try to back up a data deduplication-enabled volume or compact a large virtual hard disk (VHDx) in Windows 8 or Windows Server 2012, the computer crashes. Additionally, you receive a stop error that resembles the following: Stop 0x000000C2 (Parameter1, Parameter2, Parameter3, Parameter4) Notes.

Therefore, virtual machines that have VHD files on the Cluster Shared Volume may crash. 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.

Fixes an issue in which you cannot add VHD files to virtual machines in Windows Server 2012.

Fixes a problem that fills the event log with many ID 129 events when you run a Windows Server 2012 R2 virtual machine in Windows Azure.

When you use shared virtual hard disk (.vhdx) files on a Windows Server 2012 R2 computer, Windows OS may experience memory leak. For every IO issued by svhdxflt, VHDMP believes that there is an Activity ID. VHDMP enables this Activity ID tracing which results in the unnecessary nonpaged pool memory usage.

This article describes a Stop error that occurs in a Windows Server 2012 R2-based Hyper-V cluster. A hotfix is available to resolve this issue. The hotfix has a prerequisite. This issue occurs if Hyper-V replication is enabled in the cluster. The Stop error resembles the following: STOP: 0x00000050 ( parameter1, parameter2, parameter3, parameter4)

This security update resolves vulnerabilities in Microsoft Windows. The Windows VHDMP kernel driver improperly handles user access to certain files. An attacker could exploit this vulnerability to manipulate files in locations that are not intended to be available to the user.