For Kinetic, this was resolved in 5.19.0-17 by the apparmor and LSM
stacking patchset described by this LP bug:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1989983.
Specifically, the underlying issue was fixed in Kinetic by these two
commits:
4bd3e737cd45 Revert "UBUNTU: SAUCE: Audit: Add new record for multiple
process LSM attributes"
dd547c837f7c UBUNTU: SAUCE: lsm stacking v37: Audit: Add record for
multiple task security contexts
Together, these commits removed the affected function and replaced it
with an implementation that does not have this memory leak.
** Changed in: linux (Ubuntu Kinetic)
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/1987430
Title:
Ubuntu 22.04 kernel 5.15.0-46-generic leaks kernel memory in
kmalloc-2k slabs
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Jammy:
Fix Committed
Status in linux source package in Kinetic:
Fix Released
Bug description:
Since updating to kernel 5.15.0-46-generic (package version
5.15.0-46.49), all of our Ubuntu 22.04 LTS servers are leaking kernel
memory; our first server with 8 GB of RAM just fatally OOMed, causing
us to detect this. Inspection of OOM reports, /proc/meminfo, and
/proc/slabinfo says that it's mostly going to unreclaimable kmalloc-2k
slabs:
Aug 23 12:51:11 cluster kernel: [361299.864757] Unreclaimable slab
info:
Aug 23 12:51:11 cluster kernel: [361299.864757] Name
Used Total
[...]
Aug 23 12:51:11 cluster kernel: [361299.864924] kmalloc-2k
6676584KB 6676596KB
Most of our machines appear to be leaking slab memory at a rate of
around 20 to 40 Mbytes/hour, with some machines leaking much faster;
the champions are leaking kernel memory at 145 Mbytes/hour and 237
Mbytes/hour.
We aren't running any proprietary kernel modules and our only unusual
kernel configuration is that we've disabled AppArmor with 'apparmor=0'
on the kernel command line.
/proc/version_signature:
Ubuntu 5.15.0-46.49-generic 5.15.39
Full kernel command line from the Dell R240 system that fatally OOMd:
BOOT_IMAGE=/boot/vmlinuz-5.15.0-46-generic
root=UUID=3165564f-a2dd-4b39-935b-114f3e23ff54 ro console=ttyS0,115200
console=tty0 apparmor=0
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