SMB Connection buggy

[ManOki]

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Steps to reproduce

1. Setup an external SMB share
2. Start Download in WebUI
3. Stop Download after some seconds

Expected behaviour

As the Download from nextcloud to the user stops, the download from SMB share to nextcloud should also stop.

Actual behaviour

Nextcloud server keeps downloading the file from the SMB share.

Server configuration

Operating system: Debian Buster

Web server: Apache

Database: MariaDB

PHP version: 7.

Nextcloud version: 21.0.2

Updated from an older Nextcloud/ownCloud or fresh install:

Where did you install Nextcloud from: https://github.com/nextcloud/docker

Signing status:

Signing status

No errors have been found.

Are you using external storage, if yes which one: SMB

Are you using encryption: no

Are you using an external user-backend, if yes which one: no

Client configuration

Browser: Firefox 89.0

Operating system: Windows 10

[ManOki]

Especially, if the file is very large, this may use the whole network capacity of the nextcloud server for a long time. (I don't know, if there is a cache or the file is discarded right after the download from the SMB server)

Same for SFTP connections: #5668

[szaimen]

Lets track this in nextcloud/viewer#894
(is probably the same underlaying issue)

[ManOki]

@szaimen This should be reopened like #5668 .

[szaimen]

No, for this one I am sure.

[ManOki]

@szaimen What makes you so sure?

The other tickets is a viewer ticket, I don't even use the viewer. Likewise, the other ticket does not use/mention an SMB connection which is the main issue in this ticket.