Azure Backup: Engine encountered an unexpected error azure backup - while normal File Backup on Server 2019


We are facing the same error on two different Windows Server 2019 of two different customers with Azure Backup installed and only File Backup is made with it. The problem exists since at least two or three releases of Azure Backup Agent and both Servers still facing the problem on the last recent Version 2.0.9207.0 Sometimes the Backup runs successfull, but most time, it does not run successfull. We can not find out a difference between when it runs or it doesn't run successfull.

In the Application Eventlog I am getting this error (around 0.5-3 hours after the Backup starts):

Error   06.04.2021 22:45:42 Application Error   1000    (100)
Faulting application name: cbengine.exe, version: 2.0.9207.0, time stamp: 0x603f4e15
Faulting module name: VhdFileProvider.DLL, version: 2.0.9207.0, time stamp: 0x603f4ece
Exception code: 0xc0000005
Fault offset: 0x0000000000062696
Faulting process id: 0x2c84
Faulting application start time: 0x01d72b2e6048e099
Faulting application path: C:\Program Files\Microsoft Azure Recovery Services Agent\bin\cbengine.exe
Faulting module path: C:\Program Files\Microsoft Azure Recovery Services Agent\bin\VhdFileProvider.DLL
Report Id: d7152981-10b4-4287-8901-c682d3083cae
Faulting package full name: 
Faulting package-relative application ID: 

Next Eventlog Entry:
Information 06.04.2021 22:45:46 Windows Error Reporting 1001    None
Fault bucket 1207392101213618326, type 4
Event Name: APPCRASH
Response: Not available
Cab Id: 0

Problem signature:
P1: cbengine.exe
P2: 2.0.9207.0
P3: 603f4e15
P4: VhdFileProvider.DLL
P5: 2.0.9207.0
P6: 603f4ece
P7: c0000005
P8: 0000000000062696

Attached files:

These files may be available here:

Analysis symbol: 
Rechecking for solution: 0
Report Id: d7152981-10b4-4287-8901-c682d3083cae
Report Status: 268435456
Hashed bucket: 8ef4676486814f5630c184b811734096
Cab Guid: 0

and right after that Eventlog shows:

Information 06.04.2021 22:47:06 CBEngine    0   None
Service started successfully.

In the System Eventlog I see this error around 5-10 Minutes after Backup started:

Error   06.04.2021 22:06:42 Service Control Manager 7034    None

The Backup then starts a second time automatically, but same problem comes up again.

Further Information with similarity on both Servers:

  • there is Trendmicro Worry Free Services installed on both Customer Servers. But this is also installed on other Customer Servers where Azure Backup does not have this problem.
asked on Server Fault Apr 7, 2021 by Alex Strupler • edited Apr 13, 2021 by Pierre-Yves Gillier

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