This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:
apport-collect 1990292 and then change the status of the bug to 'Confirmed'. If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'. This change has been made by an automated script, maintained by the Ubuntu Kernel Team. ** Changed in: linux (Ubuntu) Status: New => Incomplete -- 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/1990292 Title: Mistery memory usage in linux Kernel >= 5.14 Status in linux package in Ubuntu: Incomplete Bug description: My hardware is SuperMicro X11SDV-8C-TP8F with Intel D-2146NT. I've tested this issue with: * Ubuntu 22.04 Kernel 5.15 * Ubuntu 22.04 Kernel 5.17 * Ubuntu 20.04 Kernel 5.15 * Ubuntu 20.04 Kernel 5.14 Using Ubuntu 20.04 with kernel 5.13 or lower will NOT trigger this issue. The issue is that I have high RAM usage from the server startup I cannot explain. At startup without any services active I have nearly 6GiB of RAM used: ``` # free -m total used free shared buff/cache available Mem: 15663 5998 8936 155 728 9213 Swap: 0 0 0 ``` Using ps the sum of RSS memory does not adds up: it shows less than 1GiB used: ``` # ps aux | awk '{sum+=$6} END {print sum / 1024}' 944.879 ``` This is the meminfo output ``` cat /proc/meminfo MemTotal: 16039044 kB MemFree: 8486372 kB MemAvailable: 9607120 kB Buffers: 79440 kB Cached: 1300092 kB SwapCached: 0 kB Active: 575856 kB Inactive: 1141004 kB Active(anon): 24184 kB Inactive(anon): 369940 kB Active(file): 551672 kB Inactive(file): 771064 kB Unevictable: 27884 kB Mlocked: 27884 kB SwapTotal: 2097148 kB SwapFree: 2097148 kB Dirty: 36 kB Writeback: 0 kB AnonPages: 365256 kB Mapped: 304856 kB Shmem: 50208 kB KReclaimable: 110308 kB Slab: 455680 kB SReclaimable: 110308 kB SUnreclaim: 345372 kB KernelStack: 7664 kB PageTables: 6352 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 10116668 kB Committed_AS: 2497484 kB VmallocTotal: 34359738367 kB VmallocUsed: 31940 kB VmallocChunk: 0 kB Percpu: 12800 kB HardwareCorrupted: 0 kB AnonHugePages: 4096 kB ShmemHugePages: 0 kB ShmemPmdMapped: 0 kB FileHugePages: 0 kB FilePmdMapped: 0 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 2048 kB Hugetlb: 0 kB DirectMap4k: 315700 kB DirectMap2M: 11919360 kB DirectMap1G: 6291456 kB ``` And this is the `slabtop` header: ``` Active / Total Objects (% used) : 1095487 / 1172800 (93.4%) Active / Total Slabs (% used) : 28258 / 28258 (100.0%) Active / Total Caches (% used) : 121 / 176 (68.8%) Active / Total Size (% used) : 401911.16K / 415423.19K (96.7%) Minimum / Average / Maximum Object : 0.01K / 0.35K / 10.62K ``` This is the `df -h` output: ``` df -h Filesystem Size Used Avail Use% Mounted on tmpfs 1.6G 50M 1.5G 4% /run /dev/mapper/ubuntu--vg-ubuntu--lv 14G 3.8G 9.0G 30% / tmpfs 7.7G 20K 7.7G 1% /dev/shm tmpfs 5.0M 0 5.0M 0% /run/lock /dev/sda2 2.0G 127M 1.7G 7% /boot /dev/mapper/vg0-var_log 9.8G 127M 9.2G 2% /var/log /dev/mapper/vg0-tmp 9.8G 68K 9.3G 1% /tmp /dev/mapper/vg0-var_tmp 9.8G 96K 9.3G 1% /var/tmp /dev/mapper/vg0-var_lib_docker 1.7T 11G 1.6T 1% /var/lib/docker tmpfs 1.6G 0 1.6G 0% /run/user/2010 tmpfs 1.6G 0 1.6G 0% /run/user/2023 ``` To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1990292/+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