On Wed, Jul 7, 2021 at 2:40 PM stan via kernel <kernel@xxxxxxxxxxxxxxxxxxxxxxx> wrote: > > On Wed, 7 Jul 2021 10:04:07 -0700 > stan via kernel <kernel@xxxxxxxxxxxxxxxxxxxxxxx> wrote: > > > On Wed, 7 Jul 2021 10:21:01 -0500 > > Justin Forbes <jmforbes@xxxxxxxxxxx> wrote: > > > > > > > > bpftool is a builreq, the failure there has to do with where you are > > > building it. You need bpftool from 5.13 to build a 5.14 snapshot. > > > The error is unclear, but that is the solution. This is actually a > > > very useful bit in that we will use that vmlinux.h to build > > > kernel-tools for Fedora. It is built in kernel for ELN. As I > > > rebase stable Fedora to 5.13, it will require a prebuild of > > > kernel-tools for 5.13 followed by the kernel build. > > > > I have bpftool-5.13.0-1.fc35.x86_64 installed, and that seems to have > > satisfied the buildrequire. I am also building perf, tools, > > headers, and devel, so that everything is in sync with the custom > > kernel. That used to work fine as late as 5.10 kernels. So, my > > takeaway is that this has changed, and I now need to enable the build > > of vmlinux.h. > > > > The error message I received was that bpftool could not find BFT. I > > infer from your response that turning on the build of bpf will remedy > > that. > > It doesn't. Here is the output of a compile with bpf turned on > everywhere. It shows the creation of the link that causes the problem > of an upackaged file being packaged, and then the failure to build > vmlinux.h using bpftool. > > + cp certs/signing_key.pem certs/signing_key.pem.sign > + cp certs/signing_key.x509 certs/signing_key.x509.sign > + mkdir -p /home/stan/rpmbuild/BUILDROOT/kernel-5.14.0-0.rc0.20210706git79160a603bdb.11.20210706.fc35.x86_64/usr/src/kernels > + mv /home/stan/rpmbuild/BUILDROOT/kernel-5.14.0-0.rc0.20210706git79160a603bdb.11.20210706.fc35.x86_64/lib/modules/5.14.0-0.rc0.20210706git79160a603bdb.11.20210706.fc35.x86_64/build /home/stan/rpmbuild/BUILDROOT/kernel-5.14.0-0.rc0.20210706git79160a603bdb.11.20210706.fc35.x86_64//usr/src/kernels/5.14.0-0.rc0.20210706git79160a603bdb.11.20210706.fc35.x86_64 > + ln -sf /usr/src/kernels/5.14.0-0.rc0.20210706git79160a603bdb.11.20210706.fc35.x86_64 /home/stan/rpmbuild/BUILDROOT/kernel-5.14.0-0.rc0.20210706git79160a603bdb.11.20210706.fc35.x86_64/lib/modules/5.14.0-0.rc0.20210706git79160a603bdb.11.20210706.fc35.x86_64/build > + bpftool btf dump file vmlinux format c > Error: failed to load BTF from vmlinux: No such file or directory > error: Bad exit status from /var/tmp/rpm-tmp.Zt6DVC (%build) > Bad exit status from /var/tmp/rpm-tmp.Zt6DVC (%build) > > I have debug builds turned off. Are they required for bpftool to work? No, BTF debuginfo is set on regular kernels as well. Are you building this on a rawhide system? My build/test system here is F34, but with bpftool-5.13.0-1.fc35.x86_64 (rebuilt against F34) it seems to pass fine on this. I got the same error that you did when I was running an older version of kernel-tools. In your particular user case though, you can comment out that line. The vmlinux.h created there is only used in 2 instances, where kernel-tools is built separately from the kernel, and when cross compiling the kernel (because tools have to be built native). Justin _______________________________________________ kernel mailing list -- kernel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to kernel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/kernel@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure
