I would be happy to attach logs or other information from this system or any of our other systems, many of which are still being affected by this bug until we reboot them.
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1987430/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp