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The large chunks test does a probe run of iou-zcrx before it runs the actual test. After the probe run finishes, the context will still exist until the deferred io_uring teardown. When running iou-zcrx the second time, io_uring_register_ifq() can return -EEXIST due to the existence of the old context. The fix is simple: wait for the context teardown using the new mp_clear_wait() utility before running the second instance of iou-zcrx. Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com> Link: https://patch.msgid.link/20260305080446.897628-2-dtatulea@nvidia.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>