APPLIED: [SRU][N][PATCH v2 0/1] UBUNTU: SAUCE: Revert "selftests/bpf: validate fake register spill/fill precision backtracking logic"

[Stefan Bader]

On 22/09/2026 02:23, Aaron Jauregui via kernel-team wrote:
> BugLink: https://bugs.launchpad.net/bugs/2160493
> 
> [Impact]
> The ubuntu_bpf test suite fails to build on noble 6.8.0-132 and later:
> verifier_spill_fill.c defines stack_load_preserves_const_precision and
> stack_load_preserves_const_precision_subreg twice. The v6.6.140 backport of
> upstream 7d8ed51bcb32 was applied, but that commit has been in the
> noble 6.8 base since v6.8-rc1. As a result no BPF selftests run.
> 
> [Fix]
> Revert the duplicate backport d8bdc8a63f97. The original 7d8ed51bcb32
> stays, so the test coverage is unchanged.
> 
> [Test Plan]
> Build tools/testing/selftests/bpf on the current noble tree.
> Before: verifier_spill_fill.bpf.o fails with "redefinition of
> 'stack_load_preserves_const_precision'". After: it builds cleanly.
> 
> [Where problems could occur]
> Only selftest code changes. After the revert the code matches its pre-v6.6.140
> contents. Problems are unlikely to happen outside selftests.
> 
> [Changes from v1 to v2]
> Mark the revert as "UBUNTU: SAUCE:" since it is Ubuntu-originated.
> 
> Aaron Jauregui (1):
>    UBUNTU: SAUCE: Revert "selftests/bpf: validate fake register spill/fill
>      precision backtracking logic"
> 
>   .../selftests/bpf/progs/verifier_spill_fill.c | 154 ------------------
>   1 file changed, 154 deletions(-)
> 

Applied to noble:linux/master-next. Thanks.

-Stefan
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