2

I'm trying to map source lines to addresses in an official Ubuntu kernel build. I want to be able to get offsets that I can use to setup some kprobes to debug a specific issue.

If I use apt to download the ddeb, I find that it is literally void of any debug symbols:

$ dpkg-deb --fsys-tarfile linux-image-6.17.0-19-generic-dbgsym_6.17.0-19.19~24.04.2_amd64.ddeb | tar -t
./
./usr/
./usr/share/
./usr/share/doc/
./usr/share/doc/linux-image-6.17.0-19-generic-dbgsym/
./usr/share/doc/linux-image-6.17.0-19-generic-dbgsym/changelog.Debian.gz
./usr/share/doc/linux-image-6.17.0-19-generic-dbgsym/copyright

If I grab the BuildID from the extracted bzImage, I find that there is no symbols on Ubuntu's debuginfod:

$ file main.extracted
main.extracted: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, BuildID[sha1]=3aca328be7c4b1bc5cbb857c1483d4ac6e979e45, stripped

$ curl -i https://debuginfod.ubuntu.com/buildid/3aca328be7c4b1bc5cbb857c1483d4ac6e979e45/debuginfo
HTTP/2 404
strict-transport-security: max-age=15768000
date: Sat, 18 Apr 2026 08:21:15 GMT
content-type: text/plain
content-length: 9
server: Apache/2.4.52 (Ubuntu)

not found

Surely, Ubuntu would keep the debug symbols for their kernels...

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1 Answer 1

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2

So apparently they are in the linux-image-unsigned package (linux-image-unsigned-6.17.0-19-generic-dbgsym)

$ dpkg --listfiles linux-image-unsigned-6.17.0-19-generic-dbgsym | grep /usr/lib/debug/boot
/usr/lib/debug/boot
/usr/lib/debug/boot/vmlinux-6.17.0-19-generic

$ file /usr/lib/debug/boot/vmlinux-6.17.0-19-generic
/usr/lib/debug/boot/vmlinux-6.17.0-19-generic: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, BuildID[sha1]=3aca328be7c4b1bc5cbb857c1483d4ac6e979e45, with debug_info, not stripped
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