• Intermittently VDA's might experience a fatal exception with BugCheck code 0x22 due to picadm.sys resulting Into BSOD.
• Error Event ID 1010 is logged with source picadm in System Event logs.
• The below signature is seen on analyzing the bugcheck dump:

BugCheck Code: 0x22.
Exception Code: 0x80000003.
Second Chance Exception Type: STATUS_BREAKPOINT (0x80000003).

Faulting Instruction:fffff803`b6976e00 mov qword ptr [rsp+8],rcx

DESCRIPTION: BugCheck
Exploitability Classification: UNKNOWN
BugCheck starting at nt!KeBugCheckEx+0x0000000000000000 called from picadm!OwBugCheckEx+0x0000000000000093 (Hash=0xa7dcec4d.0xaaf5379e)

• A bughceck dumps needs to be captured after enabling Driver Verifier to find the root cause. Reference article for configuring Driver verifier: https://docs.microsoft.com/en-us/windows-hardware/drivers/devtest/driver-verifier

Created a private fix for picadm.sys  to address this issue under CVADHELP-14908. Please contact Citrix support to get the private fix.

Public fix for this issue might be included in 2006 CR and 1912 LTSR CU2 release.

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Problem Cause

A Client Drive Mapping function was being called that required a structure to be in resident (non-paged pool ) memory but was allocated in paged pool memory.