Hi JianlinLV, I tried the latest 5.15.0-60-generic kernel from -updates, and I couldn't reproduce the issue anymore.
Can you try 5.15.0-60-generic and let me know? I bisected it down to 5.15.0-52-generic being broken, and it being fixed in 5.15.0-53-generic. Still trying to find the commit which fixed the issue. I had a read of your patch, and it fixes a part of the Apparmor LSM Stacking patchset that Ubuntu carries out of tree. The upstream code has changed a bit from what is found in the 5.15.0-x-generic kernel in Jammy. https://patchew.org/linux/20220927195421.14713-1-casey@schaufler- ca.com/ Let me know how 5.15.0-60-generic goes. Thanks, Matthew -- 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: In Progress Status in linux source package in Jammy: In Progress Status in linux source package in Kinetic: In Progress 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
