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Bug#996170: marked as done (linux: FTBFS if bpftool detects clang-bpf-co-re)

Your message dated Wed, 19 Feb 2025 16:13:02 +0100 (CET)
with message-id <20250219151302.71A27BE2EE7@eldamar.lan>
and subject line Closing this bug (BTS maintenance for src:linux bugs)
has caused the Debian Bug report #996170,
regarding linux: FTBFS if bpftool detects clang-bpf-co-re
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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-- 
996170: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=996170
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Source: linux
Version: 5.10.70-1
Severity: serious
Tags: ftbfs patch upstream
Justification: fails to build from source (but built successfully in the past)
X-Debbugs-Cc: nwfilardo@gmail.com

Dear Maintainer,

Attempting to build kernel packages using the machinery of
https://salsa.debian.org/kernel-team/linux.git on a host where the
"clang-bpf-co-re" test performed in the tools/bpf/bpftool directory passes will
fail, as the build will attempt to bootstrap the BTF vmlinux.h header
(confusingly, from the kernel in /boot/vmlinux-$(uname -r), as it can't find
anything else); for example:

> /dozer/scratch/nwf/tmp/linux/debian-kernel-linux/debian/build/build-tools/tools/bpf/bpftool/bpftool-bootstrap btf dump file /boot/vmlinux-5.10.0-0.bpo.5-powerpc64le format c > /dozer/scratch/nwf/tmp/linux/debian-kernel-linux/debian/build/build-tools/tools/bpf/bpftool/vmlinux.h
> Error: failed to load BTF from /boot/vmlinux-5.10.0-0.bpo.5-powerpc64le: No such file or directory

The official builders do not pass this test (see, e.g.
https://buildd.debian.org/status/fetch.php?pkg=linux&arch=ppc64el&ver=5.14.9-2&stamp=1633298169&raw=0
where the logs say "clang-bpf-co-re: [ OFF ]"), so I believe the correct answer
on Debian systems is to disable the test (making it appear as if it fails)
regardless of the host environment.  The patch below does exactly that and
allows me to build the kernel packages.

Cheers,
--nwf;

--- a/tools/bpf/bpftool/Makefile        2021-10-11 01:52:26.625003863 +0100
+++ b/tools/bpf/bpftool/Makefile        2021-10-11 03:38:54.006277839 +0100
@@ -62,8 +62,7 @@
 LLVM_STRIP ?= llvm-strip
 
 FEATURE_USER = .bpftool
-FEATURE_TESTS = libbfd disassembler-four-args reallocarray zlib libcap \
-       clang-bpf-co-re
+FEATURE_TESTS = libbfd disassembler-four-args reallocarray zlib libcap
 FEATURE_DISPLAY = libbfd disassembler-four-args zlib libcap \
        clang-bpf-co-re

--- End Message ---
--- Begin Message --- 
Hi

This bug was filed for a very old kernel or the bug is old itself
without resolution.

If you can reproduce it with

- the current version in unstable/testing
- the latest kernel from backports

please reopen the bug, see https://www.debian.org/Bugs/server-control
for details.

Regards,
Salvatore

--- End Message ---
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