wireguard-linux/tools/testing/selftests/sched_ext/dequeue_iter.c, branch stableWireGuard for the Linux kernelhttps://git.zx2c4.com/wireguard-linux/atom/tools/testing/selftests/sched_ext/dequeue_iter.c?h=stable2026-09-17T17:20:17Zselftests/sched_ext: Test that ops.dequeue() can iterate the consumed DSQ2026-09-17T17:20:17Zfangqiurongfangqiurong@kylinos.cn2026-09-17T07:52:42Zurn:sha1:9ec7ba20c97d92fa59b351832aeeb934b3b16177
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>