we have just released updated Zulu kernel, which solves this particular problem.
The problem has been in the memory lock, which overused the swap, even when the swap is off on all our OS images. This has been fixed in kernel 5.10.17+. The new kernel is 5.10.35.
Whole suite of OS images is currently being generated and within an hour uploaded to the Download section
Thank you for reporting the issue nad have a nice day,
Martin @ Unipi