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After removing the ioctl, the test case failure is expected. Blktests CI caught it, and reported it with this e-mail. The test case loop/006 is no longer valid, and its failure should be handled. I can think of two action candidates: 1) just remove the test case loop/006 2) skip the test case for kernel versions larger than v7.4, and keep it for older kernel versions The ioctl has been broken for certain period, so I think action 1) is more appropriate. If anyone has different opinion, please share. Otherwise, I will post a patch to remove loop/006.