selftests/sched_ext: Test that ops.dequeue() can iterate the consumed DSQ

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Add a scheduler whose ops.dequeue() iterates the source user DSQ with
bpf_iter_scx_dsq. The iteration takes the DSQ's raw spinlock; on a
kernel that runs ops.dequeue() while the consume path still holds that
lock, the first task consumed self-deadlocks the CPU with IRQs
disabled. The watchdog cannot recover from that state, so on an
unfixed kernel this test wedges the system instead of failing cleanly.
On a fixed kernel the scheduler runs clean and the test passes.

Signed-off-by: fangqiurong <fangqiurong@kylinos.cn>
Signed-off-by: Tejun Heo <tj@kernel.org>

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fangqiurong 2026-09-17 15:52:42 +08:00 • committed by Tejun Heo

parent cb86607ada

commit 9ec7ba20c9

3 changed files with 153 additions and 0 deletions

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1

tools/testing/selftests/sched_ext/Makefile

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73

tools/testing/selftests/sched_ext/dequeue_iter.bpf.c

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79

tools/testing/selftests/sched_ext/dequeue_iter.c

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