BSOD Caused by ctxmcswbc.sys in Non-MCS Created Machines

BSOD Caused by ctxmcswbc.sys in Non-MCS Created Machines

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Article ID: CTX223789

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Updated On:

Description

Unable to boot the machines as it was giving the BSOD. 

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Environment

Caution! Using Registry Editor incorrectly can cause serious problems that might require you to reinstall your operating system. Citrix cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk. Be sure to back up the registry before you edit it.

Resolution

After adding the "PvsVmBoot" in the registry we should be able to boot the machine again without BSOD.


HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Session Manager
Type: Multi-String Value 
Key: BootExecute
Value:
autocheck autochk *
PvsVmBoot

Problem Cause


PvsVmBoot" entry is missing from the "BootExecute" Registry Key. PvsVmBoot is responsible for configuring the CtxMcsWbc driver, and in this configuration PvsVmBoot should be disabling the driver. 

fffff880`02631888 fffff880`019d66d7 : fffffa80`40f21ef0 fffff880`019e1000 fffffa80`04e48030 fffff880`026319e0 : CtxMcsWbc+0x12c9  
fffff880`02631890 fffffa80`40f21ef0 : fffff880`019e1000 fffffa80`04e48030 fffff880`026319e0 fffff880`026319e0 : CtxMcsWbc+0x46d7  
fffff880`02631898 fffff880`019e1000 : fffffa80`04e48030 fffff880`026319e0 fffff880`fffff880`026318b0 fffff880`026319e0 : fffff880`019d6203 fffffa80`40f21eb0 00000000`00000000 fffffa80`04aa3768 : 0xfffff880`026319e0  
fffff880`026318b8 fffff880`019d6203 : fffffa80`40f21eb0 00000000`00000000 fffffa80`04aa3768 00000000`000007ff : 0xfffff880`026319e0  

Windows Updates or security patches could be one of the reason for this. 

Issue/Introduction

Unable to boot the machines as it was giving the BSOD. After BSOD machine is going in "LAST Good Backup"
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