[Bug]: Large upload fills RAM until DOS, No Upload happens.

[sol8712]

⚠️ Before submitting, please verify the following: ⚠️

• This is a bug, not a question or a configuration issue.
• This issue is not already reported on Github (I've searched it).
• Nextcloud Server and Desktop Client are up to date. See Server Maintenance and Release Schedule and Desktop Releases for supported versions.
• I agree to follow Nextcloud's Code of Conduct

Bug description

Uploading a few thousand small files with the 3.15 client on linux(Manjaro) causes the client to freeze. While frozen, in the background, the app is still running and uses up all available memory(16gb) until full system DOS, the only way to recover the system is with a hard reset risking data loss and disk corruption. No actual uploading even starts.

I see in past issues bulk uploads have generally only led to client crashes or slowdowns, however this bug is crashing the entire system running the client.

I have not tried this on a fresh system in vm and i do not know if it was present on recent previous versions. Can anyone else confirm large uploads causing their systems to crash like this?

Steps to reproduce

1. Have a folder to upload. (im trying my Steam compatdata folder since Steams own cloud system sucks, 20gb)
2. Add a new sync connection in the NC client to that folder.
3. Cry.

Expected behavior

1. Have a folder to upload. (im trying my Steam compatdata folder since Steams own cloud system sucks, 20gb)
2. Add a new sync connection in the NC client to that folder.
3. Files from folder get uploaded, and i dont lose any more saves to steams cloud nonsense.

Which files are affected by this bug

~/.local/share/steam/steamapps/compatdata

Operating system

Linux

Which version of the operating system you are running.

Manjaro

Package

Distro package manager

Nextcloud Server version

30.0.2 (AIO v10.0)

Nextcloud Desktop Client version

3.15

Is this bug present after an update or on a fresh install?

Updated to a major version (ex. 3.3.6 to 3.4.0)

Are you using the Nextcloud Server Encryption module?

Encryption is Disabled

Are you using an external user-backend?

• Default internal user-backend
• LDAP/ Active Directory
• SSO - SAML
• Other

Nextcloud Server logs

Additional info

No response

[sol8712]

While i was testing the upload on the web interface, the client started actually uploading and didnt crash...of course i didnt actually open the client while i was testing on the web interface, it just kinda opened itself in the background and started uploading.....weird but ok(desktop quirk?) the upload seems to work now. Definitely more testing needed and bugs hiding in the uploads functions.

Closing for now and adding to upload issues list.
Thanks NC staff and volunteers for all you do!

[sol8712]

I was able to upload about 3000 files (360mb) via the desktop client before it stopped uploading and RAM shot up again until system crash.

Update: Web client seems to be handling the upload just fine, over 1gb uploaded no problem so far, no excessive stress server side.