Public bug reported: I've been trying to cross-compile the Ubuntu kernel for arm64 with sbuild using an amd64 chroot. The main issue is that the Ubuntu kernel rules does not differentiate between *host* and *build* dependency items. For example, `libssl-dev` is depended upon during the build by:
1) `sign-file` utility that should run on the build machine (amd64) 2) building `linux-tools`, as link-time deps for the host machine (arm64) Same issue exists for other tools like `pahole`. IMO the correct way to handle this is how the Debian kernel team does it, i.e. mark build-arch deps as :native like in [1]: # used by upstream to build signing tools and to process certificates libssl-dev:native <!pkg.linux.nokernel>, libssl-dev <!pkg.linux.notools>, In the current Ubuntu debian rules there's no :native dependencies at all, resulting in only the host (arm64) version being installed, thus the build tool `sign-file` failing to compile. I discussed with Timo (tjaalton) on #kernel:ubuntu.com about this and it seems like we could adopt the same method for declaring dependencies as Debian, to allow cross-compiling the kernel package. Thanks a lot! [1]: https://salsa.debian.org/kernel- team/linux/-/blob/8941549ed01ecdd8b9d2f84f2fb1d46507b76861/debian/templates/source.control.in#L19-21 ProblemType: Bug DistroRelease: Ubuntu 22.04 Package: linux-image-5.15.0-122-generic 5.15.0-122.132 ProcVersionSignature: Ubuntu 5.15.0-122.132-generic 5.15.163 Uname: Linux 5.15.0-122-generic x86_64 NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair ApportVersion: 2.20.11-0ubuntu82.6 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: pengxu 215415 F.... pulseaudio CRDA: N/A CasperMD5CheckResult: unknown Date: Sun Oct 20 09:13:56 2024 MachineType: ASUS System Product Name ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=C.UTF-8 SHELL=/bin/zsh ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.15.0-122-generic root=ZFS=tank/UBUNTU/rootfs ro RebootRequiredPkgs: Error: path contained symlinks. RelatedPackageVersions: linux-restricted-modules-5.15.0-122-generic N/A linux-backports-modules-5.15.0-122-generic N/A linux-firmware 20220329.git681281e4-0ubuntu3.34 RfKill: SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) WifiSyslog: dmi.bios.date: 08/25/2022 dmi.bios.release: 20.3 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 2003 dmi.board.asset.tag: Default string dmi.board.name: PRIME Z690M-PLUS D4 dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: Rev 1.xx dmi.chassis.asset.tag: Default string dmi.chassis.type: 3 dmi.chassis.vendor: Default string dmi.chassis.version: Default string dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2003:bd08/25/2022:br20.3:svnASUS:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnPRIMEZ690M-PLUSD4:rvrRev1.xx:cvnDefaultstring:ct3:cvrDefaultstring:skuSKU: dmi.product.family: To be filled by O.E.M. dmi.product.name: System Product Name dmi.product.sku: SKU dmi.product.version: System Version dmi.sys.vendor: ASUS ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug jammy -- 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/2085030 Title: Linux kernel fails to cross-compile with sbuild amd64 chroot Status in linux package in Ubuntu: New Bug description: I've been trying to cross-compile the Ubuntu kernel for arm64 with sbuild using an amd64 chroot. The main issue is that the Ubuntu kernel rules does not differentiate between *host* and *build* dependency items. For example, `libssl-dev` is depended upon during the build by: 1) `sign-file` utility that should run on the build machine (amd64) 2) building `linux-tools`, as link-time deps for the host machine (arm64) Same issue exists for other tools like `pahole`. IMO the correct way to handle this is how the Debian kernel team does it, i.e. mark build- arch deps as :native like in [1]: # used by upstream to build signing tools and to process certificates libssl-dev:native <!pkg.linux.nokernel>, libssl-dev <!pkg.linux.notools>, In the current Ubuntu debian rules there's no :native dependencies at all, resulting in only the host (arm64) version being installed, thus the build tool `sign-file` failing to compile. I discussed with Timo (tjaalton) on #kernel:ubuntu.com about this and it seems like we could adopt the same method for declaring dependencies as Debian, to allow cross-compiling the kernel package. Thanks a lot! [1]: https://salsa.debian.org/kernel- team/linux/-/blob/8941549ed01ecdd8b9d2f84f2fb1d46507b76861/debian/templates/source.control.in#L19-21 ProblemType: Bug DistroRelease: Ubuntu 22.04 Package: linux-image-5.15.0-122-generic 5.15.0-122.132 ProcVersionSignature: Ubuntu 5.15.0-122.132-generic 5.15.163 Uname: Linux 5.15.0-122-generic x86_64 NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair ApportVersion: 2.20.11-0ubuntu82.6 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: pengxu 215415 F.... pulseaudio CRDA: N/A CasperMD5CheckResult: unknown Date: Sun Oct 20 09:13:56 2024 MachineType: ASUS System Product Name ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=C.UTF-8 SHELL=/bin/zsh ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.15.0-122-generic root=ZFS=tank/UBUNTU/rootfs ro RebootRequiredPkgs: Error: path contained symlinks. RelatedPackageVersions: linux-restricted-modules-5.15.0-122-generic N/A linux-backports-modules-5.15.0-122-generic N/A linux-firmware 20220329.git681281e4-0ubuntu3.34 RfKill: SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) WifiSyslog: dmi.bios.date: 08/25/2022 dmi.bios.release: 20.3 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 2003 dmi.board.asset.tag: Default string dmi.board.name: PRIME Z690M-PLUS D4 dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: Rev 1.xx dmi.chassis.asset.tag: Default string dmi.chassis.type: 3 dmi.chassis.vendor: Default string dmi.chassis.version: Default string dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2003:bd08/25/2022:br20.3:svnASUS:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnPRIMEZ690M-PLUSD4:rvrRev1.xx:cvnDefaultstring:ct3:cvrDefaultstring:skuSKU: dmi.product.family: To be filled by O.E.M. dmi.product.name: System Product Name dmi.product.sku: SKU dmi.product.version: System Version dmi.sys.vendor: ASUS To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2085030/+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
