Re: [PATCH v3 19/19] selftests: ublk: add end-to-end integrity test

[Ming Lei <ming.lei@redhat.com>]

On Mon, Jan 05, 2026 at 05:57:51PM -0700, Caleb Sander Mateos wrote:
> Add test case loop_08 to verify the ublk integrity data flow. It uses
> the kublk loop target to create a ublk device with integrity on top of
> backing data and integrity files. It then writes to the whole device
> with fio configured to generate integrity data. Then it reads back the
> whole device with fio configured to verify the integrity data.
> It also verifies that injected guard, reftag, and apptag corruptions are
> correctly detected.
> 
> Signed-off-by: Caleb Sander Mateos <csander@purestorage.com>
> ---
>  tools/testing/selftests/ublk/Makefile        |   1 +
>  tools/testing/selftests/ublk/test_loop_08.sh | 111 +++++++++++++++++++
>  2 files changed, 112 insertions(+)
>  create mode 100755 tools/testing/selftests/ublk/test_loop_08.sh
> 
> diff --git a/tools/testing/selftests/ublk/Makefile b/tools/testing/selftests/ublk/Makefile
> index bfd68ae64142..ab745443fd58 100644
> --- a/tools/testing/selftests/ublk/Makefile
> +++ b/tools/testing/selftests/ublk/Makefile
> @@ -33,10 +33,11 @@ TEST_PROGS += test_loop_02.sh
>  TEST_PROGS += test_loop_03.sh
>  TEST_PROGS += test_loop_04.sh
>  TEST_PROGS += test_loop_05.sh
>  TEST_PROGS += test_loop_06.sh
>  TEST_PROGS += test_loop_07.sh
> +TEST_PROGS += test_loop_08.sh
>  TEST_PROGS += test_stripe_01.sh
>  TEST_PROGS += test_stripe_02.sh
>  TEST_PROGS += test_stripe_03.sh
>  TEST_PROGS += test_stripe_04.sh
>  TEST_PROGS += test_stripe_05.sh
> diff --git a/tools/testing/selftests/ublk/test_loop_08.sh b/tools/testing/selftests/ublk/test_loop_08.sh
> new file mode 100755
> index 000000000000..ca289cfb2ad4
> --- /dev/null
> +++ b/tools/testing/selftests/ublk/test_loop_08.sh
> @@ -0,0 +1,111 @@
> +#!/bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +
> +. "$(cd "$(dirname "$0")" && pwd)"/test_common.sh
> +
> +if ! _have_program fio; then
> +	exit $UBLK_SKIP_CODE
> +fi
> +
> +fio_version=$(fio --version)
> +if [[ "$fio_version" =~ fio-[0-9]+\.[0-9]+$ ]]; then
> +	echo "Requires development fio version with https://github.com/axboe/fio/pull/1992"
> +	exit $UBLK_SKIP_CODE
> +fi
> +
> +TID=loop_08
> +
> +_prep_test "loop" "end-to-end integrity"
> +
> +_create_backfile 0 256M
> +_create_backfile 1 32M # 256M * (64 integrity bytes / 512 data bytes)
> +integrity_params="--integrity_capable --integrity_reftag
> +                  --metadata_size 64 --pi_offset 56 --csum_type t10dif"
> +dev_id=$(_add_ublk_dev -t loop -u $integrity_params "${UBLK_BACKFILES[@]}")

I tried above setting:

./kublk add -t loop --integrity_capable --integrity_reftag --metadata_size 64 --pi_offset 56 --csum_type t10dif --foreground -u /dev/sdb /dev/sdc
dev id 1: nr_hw_queues 2 queue_depth 128 block size 512 dev_capacity 8388608
	max rq size 1048576 daemon pid 38295 flags 0x160c2 state LIVE
	queue 0: affinity(0 )
	queue 1: affinity(8 )

However, IO error is always triggered:

[ 9202.316382] ublkb1: ref tag error at location 0 (rcvd 128)
[ 9202.317171] Buffer I/O error on dev ublkb1, logical block 0, async page read
[ 9202.319478] ublkb1: ref tag error at location 0 (rcvd 128)
[ 9202.319983] Buffer I/O error on dev ublkb1, logical block 0, async page read
[ 9202.326332] ublkb1: ref tag error at location 0 (rcvd 128)
[ 9202.326974] Buffer I/O error on dev ublkb1, logical block 0, async page read
[ 9202.327570] ldm_validate_partition_table(): Disk read failed.
[ 9202.336539] ublkb1: ref tag error at location 0 (rcvd 128)
[ 9202.337228] Buffer I/O error on dev ublkb1, logical block 0, async page read
[ 9202.339247] ublkb1: ref tag error at location 0 (rcvd 128)
[ 9202.339779] Buffer I/O error on dev ublkb1, logical block 0, async page read
[ 9202.344306] ublkb1: ref tag error at location 0 (rcvd 128)
[ 9202.344948] Buffer I/O error on dev ublkb1, logical block 0, async page read
[ 9202.347067] ublkb1: ref tag error at location 0 (rcvd 128)
[ 9202.347558] Buffer I/O error on dev ublkb1, logical block 0, async page read
[ 9202.348100] Dev ublkb1: unable to read RDB block 0
[ 9202.350159] ublkb1: ref tag error at location 0 (rcvd 128)
[ 9202.350642] Buffer I/O error on dev ublkb1, logical block 0, async page read
[ 9202.354977] ublkb1: ref tag error at location 0 (rcvd 128)
[ 9202.355539] Buffer I/O error on dev ublkb1, logical block 0, async page read
[ 9202.356280]  ublkb1: unable to read partition table



Thanks,
Ming