Symptoms. 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. Resolution. To resolve this issue, install update 2919355.

STOP: 0x00000001 ( parameter1, parameter2, parameter3, parameter4) This error occurs because of the double release of a push lock. Notes. This Stop error indicates an APC_INDEX_MISMATCH issue. The parameters in this Stop error message vary, depending on the configuration of the computer.

Description: 'Storage Virtualization Service Provider' driver required by the Virtual Machine Management service is not installed or is disabled. Check your settings or try reinstalling the Hyper-V role. Log Name: Microsoft-Windows-Hyper-V-Image-Management-Service-Admin. Source: Microsoft-Windows-Hyper-V-Image-Management-Service. Event ID: 15062.

Symptoms. 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. Resolution. To resolve this issue, install update 2919355.

Symptoms. When you run a Windows Server 2012 R2 virtual machine in Windows Azure, the event log may fill with many event ID 129 events. Event 129 is logged when I/O requests are dropped because of time-out issues. Note Event 129 typically means that something is wrong with the disk or that there are faulty logical unit numbers (LUNs).

Symptoms. 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.

Symptoms. When you remove a virtual disk device (VHD or VHDx file) in Windows 8.1 or Windows Server 2012 R2, extraneous log entries that resemble the following are created:

Issue 2. This issue occurs because the exclusive write lock for virtual hard disks (.vhd or .vhdx files) can't be obtained. Then, the VHD Miniport (VHDMP) driver indeed returns a STATUS_LOCK_NOT_GRANTED (C0000055) error. However, it's overridden by the STATUS_INVALID_DEVICE_STATE/ERROR_BAD_COMMAND error from another call to VHDMP.

This update is dated December 2013. This update replaces update 2870270, which is used to improve resiliency. Also, this update includes update 2869923 and update 2908415. Additionally, the update resolves several issues that occur in the following scenario: You have a Hyper-V failover cluster.

Resolution. To resolve this issue for Windows 8.1 or Windows Server 2012 R2, install update rollup 2919355. For more information about how to obtain update rollup 2919355, click the following article number to view the article in the Microsoft Knowledge Base: