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Bug description
I have identified a critical issue in Nextcloud Desktop v33.0.0 on Windows.
The nextcloud.exe process shows uncontrolled growth in committed memory (pagefile / virtual memory). It starts at a normal usage (~200–300 MB), but continuously increases over time until reaching extremely high values (up to ~35 GB or close to total system memory limits).
This behavior eventually leads to:
System instability
Memory exhaustion warnings in other applications (e.g., SOLIDWORKS)
Potential application crashes
Environment:
OS: Windows (multiple machines tested)
Nextcloud Desktop version: 33.0.0
Hardware: reproducible across different systems, but also reported by clients
Steps to reproduce
Install Nextcloud Desktop v33.0.0
Start synchronization normally
Monitor memory usage (Commit Size / Virtual Memory)
Observe continuous increase over time (no release of memory)
Expected behavior
Expected behavior:
Memory usage should remain stable (as in previous versions ~200–300 MB average)
Actual behavior:
Memory (commit size) grows indefinitely
Can reach tens of GB (30–35 GB+)
Does not get released even when idle
Impact:
This issue has been reported by multiple clients after updating to v33.0.0.
I have also reproduced it consistently in lab test environment.
Temporary workaround:
Downgrading to version 4.0.7 resolves the issue completely:
Memory usage remains stable (~227 MB average)
System stability is restored
Which files are affected by this bug
System stability
Operating system
Windows
Which version of the operating system you are running.
Windows 11
Package
Official Windows MSI
Nextcloud Server version
Truenas App Installed Version: 33.0.0 Version: 2.3.11
Nextcloud Desktop Client version
33.0.0
Is this bug present after an update or on a fresh install?
Fresh desktop client install
Are you using the Nextcloud Server Encryption module?
Encryption is Enabled
Are you using an external user-backend?
Nextcloud Server logs
Additional info
The issue appears to be a memory leak related to synchronization or background processes
The problem affects system-wide memory availability due to excessive commit usage
Same result on server with encryption enabled or disabled
Bug description
I have identified a critical issue in Nextcloud Desktop v33.0.0 on Windows.
The nextcloud.exe process shows uncontrolled growth in committed memory (pagefile / virtual memory). It starts at a normal usage (~200–300 MB), but continuously increases over time until reaching extremely high values (up to ~35 GB or close to total system memory limits).
This behavior eventually leads to:
System instability
Memory exhaustion warnings in other applications (e.g., SOLIDWORKS)
Potential application crashes
Environment:
OS: Windows (multiple machines tested)
Nextcloud Desktop version: 33.0.0
Hardware: reproducible across different systems, but also reported by clients
Steps to reproduce
Install Nextcloud Desktop v33.0.0
Start synchronization normally
Monitor memory usage (Commit Size / Virtual Memory)
Observe continuous increase over time (no release of memory)
Expected behavior
Expected behavior:
Memory usage should remain stable (as in previous versions ~200–300 MB average)
Actual behavior:
Memory (commit size) grows indefinitely
Can reach tens of GB (30–35 GB+)
Does not get released even when idle
Impact:
This issue has been reported by multiple clients after updating to v33.0.0.
I have also reproduced it consistently in lab test environment.
Temporary workaround:
Downgrading to version 4.0.7 resolves the issue completely:
Memory usage remains stable (~227 MB average)
System stability is restored
Which files are affected by this bug
System stability
Operating system
Windows
Which version of the operating system you are running.
Windows 11
Package
Official Windows MSI
Nextcloud Server version
Truenas App Installed Version: 33.0.0 Version: 2.3.11
Nextcloud Desktop Client version
33.0.0
Is this bug present after an update or on a fresh install?
Fresh desktop client install
Are you using the Nextcloud Server Encryption module?
Encryption is Enabled
Are you using an external user-backend?
Nextcloud Server logs
Additional info
The issue appears to be a memory leak related to synchronization or background processes
The problem affects system-wide memory availability due to excessive commit usage
Same result on server with encryption enabled or disabled