Re: [PATCH] selftests: ublk: add rotating auto_buf index regression test

On Thu, Jul 30, 2026 at 10:40:50AM +0800, Yang Xiuwei wrote:
> Batch AUTO_BUF_REG COMMIT must unregister the old auto_buf index before
> storing the next one. Fixed per-tag indexing (A == B) masks bugs that
> clear after overwriting io->buf.
> 
> Add kublk --rotate_auto_buf so each tag alternates between two sparse
> buffer indices, and test_batch_04.sh to exercise that path. Without the
> driver fix, the request ref stays stuck and I/O hangs; the test uses a
> short timeout and kills the ublk daemon to recover. With the fix, a
> small write completes quickly.
> 
> Signed-off-by: Yang Xiuwei <[email protected]>

Looks fine, 

Reviewed-by: Ming Lei <[email protected]>

BTW, this selftest patch should have been part of
"[PATCH v2 0/2] ublk: fix auto buf reg ordering around uring_cmd"


Thanks,
Ming