Public bug reported:
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
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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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:
New
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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