linux-stable.git/tools/testing/selftests/ublk/test_batch_04.sh, branch master Linux kernel stable tree selftests: ublk: add rotating auto_buf index regression test 2026-08-04T02:39:50+00:00 Yang Xiuwei yangxiuwei@kylinos.cn 2026-07-30T02:40:50+00:00 d507d3cb19e71f10336e41deeac517cdc21c34ea 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 <yangxiuwei@kylinos.cn> Reviewed-by: Ming Lei <tom.leiming@gmail.com> Link: https://patch.msgid.link/20260730024050.1062354-1-yangxiuwei@kylinos.cn Signed-off-by: Jens Axboe <axboe@kernel.dk> 
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 <yangxiuwei@kylinos.cn>
Reviewed-by: Ming Lei <tom.leiming@gmail.com>
Link: https://patch.msgid.link/20260730024050.1062354-1-yangxiuwei@kylinos.cn
Signed-off-by: Jens Axboe <axboe@kernel.dk>