Wanted to do some kernel building after upgrading and was suddenly faced with a failed genkernel run. Manual kernel build also failed, see below. Downgrading to pahole-1.23 fixed it. Reproducible: Always Steps to Reproduce: 1. update to pahole-1.24 2. build kernel with BTF enabled (e.g. for bpftrace) 3. fail Actual Results: LD vmlinux BTFIDS vmlinux FAILED: load BTF from vmlinux: Invalid argument make: *** [Makefile:1168: vmlinux] Error 255 make: *** Deleting file 'vmlinux' Expected Results: Successful build.
lkml thread: https://lore.kernel.org/bpf/20220825163538.vajnsv3xcpbhl47v@altlinux.org/
The bug has been referenced in the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=7511864b0c1645468d0763760640c571226958f2 commit 7511864b0c1645468d0763760640c571226958f2 Author: Matthias Schwarzott <zzam@gentoo.org> AuthorDate: 2022-09-08 05:25:34 +0000 Commit: Matthias Schwarzott <zzam@gentoo.org> CommitDate: 2022-09-08 05:35:26 +0000 dev-util/pahole: Mask version 1.24 due to kernel build break Bug: https://bugs.gentoo.org/868762 Signed-off-by: Matthias Schwarzott <zzam@gentoo.org> profiles/package.mask | 5 +++++ 1 file changed, 5 insertions(+)
Apparently today's 5.10.151 features a fix for pahole 1.24. Don't know about other branches.
Thanks for the notice - I had forgotten about this, and indeed 6.0.6 just built without problems with an unmasked pahole-1.24. Looks like it was fixed in 6.0 and is now percolating to the stable trees. What's the procedure to get this unmasked?
Let's wait for all kernels having the fix to be stable, and old versions to be gone first.
As far as I can tell the patch in question never made it into 4.x or 5.4 (or I missed it in the ChangeLogs), probably because 4.x don't have the affected BTF infrastructure to begin with. 5.4.228 does have CONFIG_DEBUG_INFO_BTF and builds correctly with pahole-1.24: CHK include/generated/compile.h LD vmlinux.o MODPOST vmlinux.o MODINFO modules.builtin.modinfo LD .tmp_vmlinux.btf BTF .btf.vmlinux.bin.o LD .tmp_vmlinux.kallsyms1 KSYM .tmp_vmlinux.kallsyms1.o LD .tmp_vmlinux.kallsyms2 KSYM .tmp_vmlinux.kallsyms2.o LD vmlinux SORTEX vmlinux SYSMAP System.map Building modules, stage 2. MODPOST 689 modules So it looks like we can unmask pahole-1.24 now.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=d609d27f2572d9f15f14bfaa4f15af823168c972 commit d609d27f2572d9f15f14bfaa4f15af823168c972 Author: Sam James <sam@gentoo.org> AuthorDate: 2023-01-14 15:24:23 +0000 Commit: Sam James <sam@gentoo.org> CommitDate: 2023-01-14 15:24:23 +0000 profiles: unmask pahole The kernels in stable have been long-fixed. Closes: https://bugs.gentoo.org/868762 Thanks-to: Holger Hoffstätte <holger@applied-asynchrony.com> Signed-off-by: Sam James <sam@gentoo.org> profiles/package.mask | 5 ----- 1 file changed, 5 deletions(-)
