Hi everyone,
I am facing a critical issue with my UrBackup Windows client. The client’s GUI displays the following error message:
[Window Title] UrBackup [Content] There is an error. At this time nothing can be backed up.
The main issue is that whenever this error occurs, the UrBackup background service on Windows completely stops/crashes. It aborts all operations and does not attempt to run again, leaving the entire backup routine paralyzed until the service is manually restarted.
We are currently deploying the UrBackup Hyper-V module on this server, which hosts about 10 Hyper-V VMs. For context on hardware resources, the host server currently has about 32GB of free RAM available, so it shouldn’t be running out of physical memory.
Does anyone know what might be causing the background service to completely halt while displaying this message on the frontend? Is there any configuration or workaround to prevent the service from simply “dying” when VSS or network failures occur?
Instead of attaching the full file, here is the relevant snippet from the debug.log where the fatal exceptions (Application Crashed / SIGABRT / bad allocation) happen:
2026-05-08 10:41:15: ClientService cmd: STATUS DETAIL#pw=[REDACTED]
2026-05-08 10:41:16: ClientService cmd: STATUS DETAIL#pw=[REDACTED]
2026-05-08 10:41:16: ClientService cmd: STATUS#pw=[REDACTED]
2026-05-08 10:41:16: WARNING: No reference point found. Resetting CBT
2026-05-08 10:41:16: Hyper-V save_id 12
2026-05-08 10:41:16: Script “C:\Program Files\UrBackup\preimagebackup.bat” does not exist
2026-05-08 10:41:16: Creating shadowcopy of “hyperv://[VM-NOME]/SCSI:0:0”…
2026-05-08 10:41:16: ERROR: Thread exit with unhandled std::exception bad allocation
2026-05-08 10:41:16: ERROR: Fatal exception code 3765269347 at address 0x00007FFD063EA80A
2026-05-08 10:41:17: ERROR: Fatal exception (APPLICATION CRASHED). Crash dump written to “C:\Windows\TEMP\UrBackup\v2.0.0-20260508-104116-18992-28916.dmp”
2026-05-08 10:41:17: ERROR: Program abort (SIGABRT)
2026-05-08 10:41:17: ClientService cmd: STATUS DETAIL#pw=[REDACTED]
2026-05-08 10:41:18: ClientService cmd: STATUS DETAIL#pw=[REDACTED]
Another instance:
2026-05-08 10:30:29: rc=0 hasError=true state=0
2026-05-08 10:30:29: SERVICE_COMMANDS finished
2026-05-08 10:30:29: Started connection to SERVICE_COMMANDS
2026-05-08 10:30:29: ClientService cmd: #[REDACTED]#INCRINTERVALL “259203?startup_delay=120”
2026-05-08 10:30:29: rc=0 hasError=true state=0
2026-05-08 10:30:29: SERVICE_COMMANDS finished
2026-05-08 10:30:29: WARNING: No reference point found. Resetting CBT
2026-05-08 10:30:29: Hyper-V save_id 7
2026-05-08 10:30:29: Script “C:\Program Files\UrBackup\preimagebackup.bat” does not exist
2026-05-08 10:30:29: Creating shadowcopy of “hyperv://[VM-NOME]/SCSI:0:0”…
2026-05-08 10:30:29: ERROR: Fatal exception code 3221225477 at address 0x00007FFC81861500
2026-05-08 10:30:29: Started connection to SERVICE_COMMANDS
2026-05-08 10:30:29: ClientService cmd: #[REDACTED]#CAPA clientsubname=[VM-NOME]
2026-05-08 10:30:29: ERROR: Fatal exception (APPLICATION CRASHED). Crash dump written to “C:\Windows\TEMP\UrBackup\v2.0.0-20260508-103029-34944-14856.dmp”
2026-05-08 10:30:29: ERROR: Program abort (SIGABRT)