This is happening on a server and I cannot persuade it to run apport-
collect in any useful way; it fails both with and without forwarded X
(where lynx is started but apparently is incompatible with Launchpad for
authorizing machines). I can attach specific information if necessary.
As an update, we have some systems that without the kernel update but
with our recent change to explicitly disable AppArmor on the kernel
command line, and they seem to also have the symptoms of this problem.
So this issue may be a general one with disabling AppArmor in the Ubuntu
kernel.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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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:
Confirmed
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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