selftests/sched_ext: Fix select_cpu_dfl link leak on early return

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If run() exits early via SCX_EQ/SCX_ASSERT (which calls return
directly), bpf_link__destroy() is never reached and the BPF
scheduler stays loaded. All subsequent tests then fail to attach
because SCX is not in the DISABLED state.

Move bpf_link into a context struct so cleanup() always destroys
it, regardless of how run() exits. Also skip waitpid() for children
where fork() returned -1, avoiding waitpid(-1,...) accidentally
reaping an unrelated child and triggering the early return path.

Signed-off-by: Cheng-Yang Chou <yphbchou0911@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>

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Cheng-Yang Chou 2026-05-08 14:55:12 +08:00 • committed by Tejun Heo

parent d91b36de53

commit e18002d2c7

1 changed files with 38 additions and 16 deletions

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tools/testing/selftests/sched_ext/select_cpu_dfl.c

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