apport information ** Attachment added: "CurrentDmesg.txt" https://bugs.launchpad.net/bugs/2038685/+attachment/5707465/+files/CurrentDmesg.txt
-- 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/2038685 Title: Missing BTF file in Ubuntu ESM kernels Status in linux package in Ubuntu: Confirmed Bug description: This is a follow-up from: https://discourse.ubuntu.com/t/ask-us- anything-about-ubuntu-kernels/27664/142 Older Ubuntu distributions come with a kernel image that support eBPF but are not built with a BTF file published (/sys/kernel/btf/vmlinux). This BTF file is crucial when trying to run eBPF programs that were built with CO-RE in mind such that a program can be compiled once and run in any kernel (with some caveats) because the BPF loaders can use the BTF file to relocate addresses of kernel fields at load time for the currently running kernel. In the past I've used the debug symbols that Ubuntu publishes to create BTF files using `pahole` for these older kernels and then re-using that BTF file for any machine running that kernel. This is not ideal but I had managed to work around it. However, on distributions that are under ESM (Ubuntu 16 + Ubuntu 18) there isn't a debug symbols repository from where to pull the debug symbols packages to build their respective BTF file and no BTF file is generated when the kernel is built. This essentially makes these ESM kernels incompatible with eBPF programs that run using CO-RE (which is more or less the norm nowadays). Based on my conversation on the discourse link above it seems like ideally these ESM kernels should be published with a BTF file. P.S. I wasn't able to submit this through `ubuntu-bug linux` as it gave me an error saying `Problem in linux-image-5.4.0-164-generic This is not an official Ubuntu package. Please remove any third party package and try again`. I am not sure why it says that as this is a Ubuntu VM downloaded from the Ubuntu site, upgraded by doing `pro attach` and then updated to the latest ESM kernel. --- ProblemType: Bug ApportVersion: 2.20.9-0ubuntu7.29 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: andres 3050 F.... pulseaudio CurrentDesktop: ubuntu:GNOME DistroRelease: Ubuntu 18.04 InstallationDate: Installed on 2021-05-18 (870 days ago) InstallationMedia: Ubuntu 18.04.5 LTS "Bionic Beaver" - Release amd64 (20200806.1) Lsusb: Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 004: ID 0e0f:0008 VMware, Inc. Bus 002 Device 003: ID 0e0f:0002 VMware, Inc. Virtual USB Hub Bus 002 Device 002: ID 0e0f:0003 VMware, Inc. Virtual Mouse Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub MachineType: VMware, Inc. VMware Virtual Platform Package: linux (not installed) ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 svgadrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-164-generic root=UUID=c6dbf1d0-3a95-4d98-a0f8-fdea28a5ffc9 ro find_preseed=/preseed.cfg auto noprompt priority=critical locale=en_US quiet ProcVersionSignature: Ubuntu 5.4.0-164.181~18.04.1-generic 5.4.248 RelatedPackageVersions: linux-restricted-modules-5.4.0-164-generic N/A linux-backports-modules-5.4.0-164-generic N/A linux-firmware 1.173.21 RfKill: 0: hci0: Bluetooth Soft blocked: no Hard blocked: no Tags: bionic Uname: Linux 5.4.0-164-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip docker kvm libvirt lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 11/12/2020 dmi.bios.vendor: Phoenix Technologies LTD dmi.bios.version: 6.00 dmi.board.name: 440BX Desktop Reference Platform dmi.board.vendor: Intel Corporation dmi.board.version: None dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 1 dmi.chassis.vendor: No Enclosure dmi.chassis.version: N/A dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvr6.00:bd11/12/2020:svnVMware,Inc.:pnVMwareVirtualPlatform:pvrNone:rvnIntelCorporation:rn440BXDesktopReferencePlatform:rvrNone:cvnNoEnclosure:ct1:cvrN/A: dmi.product.name: VMware Virtual Platform dmi.product.version: None dmi.sys.vendor: VMware, Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2038685/+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
