** Also affects: dwarves-dfsg (Ubuntu Bionic)
Importance: Undecided
Status: New
** Also affects: libbpf (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: dwarves-dfsg (Ubuntu Bionic)
Status: New => In Progress
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https://bugs.launchpad.net/bugs/1912811
Title:
Update dwarves-dfsg in focal to version 1.21 from impish
Status in dwarves-dfsg package in Ubuntu:
Invalid
Status in libbpf package in Ubuntu:
Fix Released
Status in dwarves-dfsg source package in Bionic:
In Progress
Status in libbpf source package in Bionic:
New
Status in dwarves-dfsg source package in Focal:
Fix Committed
Status in libbpf source package in Focal:
Won't Fix
Status in dwarves-dfsg source package in Groovy:
Won't Fix
Status in libbpf source package in Groovy:
Won't Fix
Status in dwarves-dfsg source package in Hirsute:
Fix Committed
Status in libbpf source package in Hirsute:
Won't Fix
Bug description:
[Impact]
BTF is an extremely useful tool for BPF developers. Enabling BTF
support in the HWE kernel requires pahole from dwarves-dfsg 1.21 or
later, but in focal we have only 1.15. The simplest path for us to get
a sufficiently updated version of pahole is to backport dwarves-dfsg
from hirsute, which is at version 1.21 with v5.13 compat fixes.
[Test Case]
Building a v5.13 based kernel with CONFIG_DEBUG_INFO_BTF enabled fails
with the version of pahole currently in focal, complaining that pahole
1.16 or later is needed. Building with a newer version of pahole is
successful.
[Where problems could occur]
Moving the package forward carries significant risks. The biggest risk
is clearly new bugs. There may also be interface changes which break
existing workflows. I believe the following factors indicate that the
level of risk here is acceptable:
* Currently there are no bug reports open against the package in
groovy (there are virtually no bug reports open at all against the
package in fact).
* I have done a review of the changes between 1.15 and 1.21. The bulk
of the changes are for the required BTF support, and the vast majority
of these are an update of its local copy of libbpf. The balance of the
changes are bug fixes and enhancements to pahole, none of which look
to change the user interface in a way which will break existing
workflows. Note that in later releases libbpf is now packaged stand
alone, so this SRU covers libbpf as well.
* But also the 1.15 dwarves is kind of useless, as it doesn't work
with latest kernels for the BPF features.
* No packages in focal have dependencies or build dependencies on the
dwarves package.
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