Upload fails due to out of memory

Hi all

Uploading a point never really worked in my setup. The process stops after a couple minutes. The upload during the background processing of nextcloud does not work too.
As I found out today, its because of the PHP going out of memory.
I started the upload process manually for example with the following parameters for php:

(I started it inside the docker container)

Limit to 4GB of memory

php --define apc.enable_cli=1 --define memory_limit=4096M /var/www/html/occ backup:point:upload 20220330174131-full-PRHhBIchcGk5AJl
Result:

...
  * Uploading data/data-9b2543e5-06cf-4140-a1cb-790b68c829be/00017-j2dPiFe6UoPaGAR: ok
  * Uploading data/data-9b2543e5-06cf-4140-a1cb-790b68c829be/00018-QAsOQFCZ4u3E5sd: PHP Fatal error:  Allowed memory size of 4294967296 bytes exhausted (tried to allocate 139810208 bytes) in /var/www/html/custom_apps/backup/lib/Service/PackService.php on line 606

No memory limit at all

php --define apc.enable_cli=1 --define memory_limit=-1 /var/www/html/occ backup:point:upload 20220330174131-full-PRHhBIchcGk5AJl
Result (because of the "unlimited" memory it used more than 8GB of memory):

...
  * Uploading data/data-3daeea38-1fc4-4a73-a076-4d48e4090fac/00018-L3NjJfWfK2fiLQV: ok
  * Uploading data/data-3daeea38-1fc4-4a73-a076-4d48e4090fac/00019-pNi5zxKK6LpRXME: ok
  * Uploading data/data-3daeea38-1fc4-4a73-a076-4d48e4090fac/00020-OvB968OSmGeU3BD: Killed

Is there a memory leak somewhere? How could I prevent this?

Thx for the support

Start with custom_apps/backup/lib/Service/PackService.php at line 606 and reproduce the failure using the reported occ backup:point:upload command inside the Docker container. Compare memory use with the 4096M and unlimited PHP settings while processing the affected point; done means the upload no longer exhausts available memory or is killed.