I've been digging into this and this appears to be a regression introduced by the following patch https://github.com/torvalds/linux/commit/3cd3399dd7a84 which was first released in Linux 6.0.0.
The bug is not a memory leak but rather a bug in how memory usage is counted. Excess memory is not actually being consumed, though the bug is still fatal since the counter controls Linux's memory pressure logic. The (apparently) responsible patch is a performance optimisation which attempts to reduce the frequency of writes to the system-wide counter which (I suspect) is subtly misusing some atomic operation on ARM. If you undo this patch in a recent kernel, the bug disappears. I am currently working on a detailed bug report for the relevant Kernel maintainers. NB: It appears that the "5.15" kernel shipped by Rocky (and RHEL) includes a back-port of this bug, hence my seeing the bug in that kernel version on Rocky Linux. A non-RedHat-patched vanilla build of 5.15 does not exhibit the bug in my system either. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2045560 Title: TCP memory leak, slow network (arm64) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-signed-aws-6.2/+bug/2045560/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
