add device removal test v2

add device removal test v2

[Christoph Hellwig]

Hi all,

this series adds two tests for removing a device underneath the
file system.  This covers the new shutdown handling series I'm
posting.

Changes since v1:
 - renumbered the tests
 - add a check that the tests are only run on block based file systems

[PATCH 1/2] generic: add a test for device removal with dirty data

[Christoph Hellwig]

Test the removal of the underlying device when the file system still
has dirty data.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 tests/generic/730     | 57 +++++++++++++++++++++++++++++++++++++++++++
 tests/generic/730.out |  2 ++
 2 files changed, 59 insertions(+)
 create mode 100755 tests/generic/730
 create mode 100644 tests/generic/730.out

diff --git a/tests/generic/730 b/tests/generic/730
new file mode 100755
index 00000000..6fba31fc
--- /dev/null
+++ b/tests/generic/730
@@ -0,0 +1,57 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2015 Red Hat Inc. All Rights Reserved.
+# Copyright (c) 2023 Christoph Hellwig
+#
+# Test proper file system shut down when the block device is removed underneath
+# and there is dirty data.
+#
+. ./common/preamble
+_begin_fstest auto quick
+
+_cleanup()
+{
+	cd /
+	$UMOUNT_PROG $SCRATCH_MNT >>$seqres.full 2>&1
+	_put_scsi_debug_dev
+	rm -f $tmp.*
+}
+
+. ./common/filter
+. ./common/scsi_debug
+
+_supported_fs generic
+
+# We don't actually use the test device, but we need a block based fs
+_require_test
+_require_block_device $TEST_DEV
+_require_scsi_debug
+
+physical=`blockdev --getpbsz $SCRATCH_DEV`
+logical=`blockdev --getss $SCRATCH_DEV`
+
+SCSI_DEBUG_DEV=`_get_scsi_debug_dev ${physical:-512} ${logical:-512} 0 300`
+test -b "$SCSI_DEBUG_DEV" || _notrun "Failed to initialize scsi debug device"
+echo "SCSI debug device $SCSI_DEBUG_DEV" >>$seqres.full
+
+_mkfs_dev $SCSI_DEBUG_DEV
+
+_mount $SCSI_DEBUG_DEV $SCRATCH_MNT
+
+# create a test file
+$XFS_IO_PROG -f -c "pwrite 0 1M" $SCRATCH_MNT/testfile >>$seqres.full
+
+# open a file descriptor for reading the file
+exec 3< $SCRATCH_MNT/testfile
+
+# delete the scsi debug device while it still has dirty data
+echo 1 > /sys/block/`_short_dev $SCSI_DEBUG_DEV`/device/delete
+
+# try to read from the file, which should give us -EIO
+cat <&3 > /dev/null
+
+# close the file descriptor to not block unmount
+exec 3<&-
+
+status=0
+exit
diff --git a/tests/generic/730.out b/tests/generic/730.out
new file mode 100644
index 00000000..79e96db8
--- /dev/null
+++ b/tests/generic/730.out
@@ -0,0 +1,2 @@
+QA output created by 730
+cat: -: Input/output error
-- 
2.39.2

Re: [PATCH 1/2] generic: add a test for device removal with dirty data

[Zorro Lang]

On Tue, Jul 11, 2023 at 12:09:30PM +0200, Christoph Hellwig wrote:
> Test the removal of the underlying device when the file system still
> has dirty data.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---

Thanks this new version! Sorry for the late review. Most of the cases look
good to me, just a bit picky reveiw points as below. (Same to patch 2/2).

>  tests/generic/730     | 57 +++++++++++++++++++++++++++++++++++++++++++
>  tests/generic/730.out |  2 ++
>  2 files changed, 59 insertions(+)
>  create mode 100755 tests/generic/730
>  create mode 100644 tests/generic/730.out
> 
> diff --git a/tests/generic/730 b/tests/generic/730
> new file mode 100755
> index 00000000..6fba31fc
> --- /dev/null
> +++ b/tests/generic/730
> @@ -0,0 +1,57 @@
> +#! /bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright (c) 2015 Red Hat Inc. All Rights Reserved.
> +# Copyright (c) 2023 Christoph Hellwig
> +#
> +# Test proper file system shut down when the block device is removed underneath
> +# and there is dirty data.
> +#
> +. ./common/preamble
> +_begin_fstest auto quick
> +
> +_cleanup()
> +{
> +	cd /
> +	$UMOUNT_PROG $SCRATCH_MNT >>$seqres.full 2>&1
> +	_put_scsi_debug_dev
> +	rm -f $tmp.*
> +}
> +
> +. ./common/filter
> +. ./common/scsi_debug
> +
> +_supported_fs generic
> +
> +# We don't actually use the test device, but we need a block based fs
> +_require_test
> +_require_block_device $TEST_DEV
> +_require_scsi_debug
> +
> +physical=`blockdev --getpbsz $SCRATCH_DEV`
> +logical=`blockdev --getss $SCRATCH_DEV`

There's not _require_scratch, so I doubt we should use SCRATCH_DEV directly.
How about use TEST_DEV (due to this case calls _require_test) ?

> +
> +SCSI_DEBUG_DEV=`_get_scsi_debug_dev ${physical:-512} ${logical:-512} 0 300`
> +test -b "$SCSI_DEBUG_DEV" || _notrun "Failed to initialize scsi debug device"
> +echo "SCSI debug device $SCSI_DEBUG_DEV" >>$seqres.full
> +
> +_mkfs_dev $SCSI_DEBUG_DEV

How about _fail if it fails?

> +
> +_mount $SCSI_DEBUG_DEV $SCRATCH_MNT

I don't know if mount can return non-zero without any output. If you hope to
check the return status, you can use run_check() in common/rc.

> +
> +# create a test file
> +$XFS_IO_PROG -f -c "pwrite 0 1M" $SCRATCH_MNT/testfile >>$seqres.full
> +
> +# open a file descriptor for reading the file
> +exec 3< $SCRATCH_MNT/testfile
> +
> +# delete the scsi debug device while it still has dirty data
> +echo 1 > /sys/block/`_short_dev $SCSI_DEBUG_DEV`/device/delete

Is this file "/sys/block/`_short_dev $SCSI_DEBUG_DEV`/device/delete" 100%
supported? Or we'd better to _notrun, not report pass.

(BTW, the `command` and $(command) are both work, but the $() is more recommended
in fstests (not mandatory:). If both formats are good, choose $(command).
http://mywiki.wooledge.org/BashFAQ/082)

Thanks,
Zorro

> +
> +# try to read from the file, which should give us -EIO
> +cat <&3 > /dev/null
> +
> +# close the file descriptor to not block unmount
> +exec 3<&-
> +
> +status=0
> +exit
> diff --git a/tests/generic/730.out b/tests/generic/730.out
> new file mode 100644
> index 00000000..79e96db8
> --- /dev/null
> +++ b/tests/generic/730.out
> @@ -0,0 +1,2 @@
> +QA output created by 730
> +cat: -: Input/output error
> -- 
> 2.39.2
> 

[PATCH] generic: add a test for device removal with dirty data

[Zorro Lang]

From: Christoph Hellwig <hch@lst.de>

Test the removal of the underlying device when the file system still
has dirty data.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---

Hi Christoph,

I'd like to help this patchset to catch this or next fstests release. So I
changed this patch a bit, if you feel good, I'll merge this patch as below.
(Same to the 2nd patch).

Change logs:
1) Replace SCRATCH_DEV with TEST_DEV, replace SCRATCH_MNT with SCSI_DEBUG_MNT
   which is a directory in TEST_DIR, due to we don't call _require_scratch
   in this case.
2) Call _fail if _mkfs_dev or _mount fails

Thanks,
Zorro

 tests/generic/730     | 59 +++++++++++++++++++++++++++++++++++++++++++
 tests/generic/730.out |  2 ++
 2 files changed, 61 insertions(+)
 create mode 100755 tests/generic/730
 create mode 100644 tests/generic/730.out

diff --git a/tests/generic/730 b/tests/generic/730
new file mode 100755
index 00000000..7886b38d
--- /dev/null
+++ b/tests/generic/730
@@ -0,0 +1,59 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2015 Red Hat Inc. All Rights Reserved.
+# Copyright (c) 2023 Christoph Hellwig
+#
+# Test proper file system shut down when the block device is removed underneath
+# and there is dirty data.
+#
+. ./common/preamble
+_begin_fstest auto quick
+
+_cleanup()
+{
+	cd /
+	$UMOUNT_PROG $SCSI_DEBUG_MNT >>$seqres.full 2>&1
+	_put_scsi_debug_dev
+	rm -r -f $tmp.*
+}
+
+. ./common/filter
+. ./common/scsi_debug
+
+_supported_fs generic
+
+# We don't actually use the test device, but we need a block based fs
+_require_test
+_require_block_device $TEST_DEV
+_require_scsi_debug
+
+physical=`blockdev --getpbsz $TEST_DEV`
+logical=`blockdev --getss $TEST_DEV`
+
+SCSI_DEBUG_DEV=`_get_scsi_debug_dev ${physical:-512} ${logical:-512} 0 300`
+test -b "$SCSI_DEBUG_DEV" || _notrun "Failed to initialize scsi debug device"
+echo "SCSI debug device $SCSI_DEBUG_DEV" >>$seqres.full
+
+_mkfs_dev $SCSI_DEBUG_DEV || _fail "make $FSTYP on $SCSI_DEBUG_DEV"
+SCSI_DEBUG_MNT="$TEST_DIR/scsi_debug_$seq"
+rm -rf $SCSI_DEBUG_MNT
+mkdir $SCSI_DEBUG_MNT
+run_check _mount $SCSI_DEBUG_DEV $SCSI_DEBUG_MNT
+
+# create a test file
+$XFS_IO_PROG -f -c "pwrite 0 1M" $SCSI_DEBUG_MNT/testfile >>$seqres.full
+
+# open a file descriptor for reading the file
+exec 3< $SCSI_DEBUG_MNT/testfile
+
+# delete the scsi debug device while it still has dirty data
+echo 1 > /sys/block/$(_short_dev $SCSI_DEBUG_DEV)/device/delete
+
+# try to read from the file, which should give us -EIO
+cat <&3 > /dev/null
+
+# close the file descriptor to not block unmount
+exec 3<&-
+
+status=0
+exit
diff --git a/tests/generic/730.out b/tests/generic/730.out
new file mode 100644
index 00000000..79e96db8
--- /dev/null
+++ b/tests/generic/730.out
@@ -0,0 +1,2 @@
+QA output created by 730
+cat: -: Input/output error
-- 
2.40.1

Re: [PATCH] generic: add a test for device removal with dirty data

[Christoph Hellwig]

On Sun, Jul 23, 2023 at 12:50:17PM +0800, Zorro Lang wrote:
> I'd like to help this patchset to catch this or next fstests release. So I
> changed this patch a bit, if you feel good, I'll merge this patch as below.
> (Same to the 2nd patch).

I've actually got a few other changes locally nad plant to send it out.

> Change logs:
> 1) Replace SCRATCH_DEV with TEST_DEV, replace SCRATCH_MNT with SCSI_DEBUG_MNT
>    which is a directory in TEST_DIR, due to we don't call _require_scratch
>    in this case.

The SCSI_DEBUG_MNT change is fine.  The SCRATCH_DEV stuff I think we don't
need at all, after all the sector size doesn't really matter for this
test, so I've just dropped it.

> 2) Call _fail if _mkfs_dev or _mount fails

Shouldn't the mkfs side also use run_check ?

Btw, your cleanups should also go into generic/108 from where I took
the scsi_debug boilerplate.

I'll resend later today, also incorporating your changes.

[PATCH 2/2] generic: add a test for device removal without dirty data

[Christoph Hellwig]

Test the removal of the underlying device when the file system still
does not have dirty data.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 tests/generic/731     | 58 +++++++++++++++++++++++++++++++++++++++++++
 tests/generic/731.out |  2 ++
 2 files changed, 60 insertions(+)
 create mode 100755 tests/generic/731
 create mode 100644 tests/generic/731.out

diff --git a/tests/generic/731 b/tests/generic/731
new file mode 100755
index 00000000..4a6a2355
--- /dev/null
+++ b/tests/generic/731
@@ -0,0 +1,58 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2015 Red Hat Inc. All Rights Reserved.
+# Copyright (c) 2023 Christoph Hellwig
+#
+# Test proper file system shut down when the block device is removed underneath
+# and it has no dirty data.
+#
+#
+. ./common/preamble
+_begin_fstest auto quick
+
+_cleanup()
+{
+	cd /
+	$UMOUNT_PROG $SCRATCH_MNT >>$seqres.full 2>&1
+	_put_scsi_debug_dev
+	rm -f $tmp.*
+}
+
+. ./common/filter
+. ./common/scsi_debug
+
+# We don't actually use the test device, but we need a block based fs
+_require_test
+_require_block_device $TEST_DEV
+_supported_fs generic
+_require_scsi_debug
+
+physical=`blockdev --getpbsz $SCRATCH_DEV`
+logical=`blockdev --getss $SCRATCH_DEV`
+
+SCSI_DEBUG_DEV=`_get_scsi_debug_dev ${physical:-512} ${logical:-512} 0 300`
+test -b "$SCSI_DEBUG_DEV" || _notrun "Failed to initialize scsi debug device"
+echo "SCSI debug device $SCSI_DEBUG_DEV" >>$seqres.full
+
+_mkfs_dev $SCSI_DEBUG_DEV
+
+_mount $SCSI_DEBUG_DEV $SCRATCH_MNT
+
+# create a test file
+$XFS_IO_PROG -f -c "pwrite 0 1M" -c "fsync" $SCRATCH_MNT/testfile >>$seqres.full
+
+# open a file descriptor for reading the file
+exec 3< $SCRATCH_MNT/testfile
+
+# drop all caches and delete the scsi debug device
+echo 3 > /proc/sys/vm/drop_caches
+echo 1 > /sys/block/`_short_dev $SCSI_DEBUG_DEV`/device/delete
+
+# try to read from the file, which should give us -EIO
+cat <&3 > /dev/null
+
+# close the file descriptor to not block unmount
+exec 3<&-
+
+status=0
+exit
diff --git a/tests/generic/731.out b/tests/generic/731.out
new file mode 100644
index 00000000..102c0522
--- /dev/null
+++ b/tests/generic/731.out
@@ -0,0 +1,2 @@
+QA output created by 731
+cat: -: Input/output error
-- 
2.39.2

add device removal test v3

[Christoph Hellwig]

Hi all,

this series adds two tests for removing a device underneath the
file system.  This covers the new shutdown handling series I'm
posting.

Changes since v2:
 - don't look for specific logical/physical block sizes on SCRATCH_DEV
 - use run_check (Zorro Lang)
 - use SCSI_DEBUG_MNT instead of SCRATCH_DEV (Zorro Lang)

Changes since v1:
 - renumbered the tests
 - add a check that the tests are only run on block based file systems

[PATCH 2/2] generic: add a test for device removal without dirty data

[Christoph Hellwig]

Test the removal of the underlying device when the file system still
does not have dirty data.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 tests/generic/731     | 58 +++++++++++++++++++++++++++++++++++++++++++
 tests/generic/731.out |  2 ++
 2 files changed, 60 insertions(+)
 create mode 100755 tests/generic/731
 create mode 100644 tests/generic/731.out

diff --git a/tests/generic/731 b/tests/generic/731
new file mode 100755
index 00000000..e1400d06
--- /dev/null
+++ b/tests/generic/731
@@ -0,0 +1,58 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2015 Red Hat Inc. All Rights Reserved.
+# Copyright (c) 2023 Christoph Hellwig
+#
+# Test proper file system shut down when the block device is removed underneath
+# and it has no dirty data.
+#
+#
+. ./common/preamble
+_begin_fstest auto quick
+
+_cleanup()
+{
+	cd /
+	$UMOUNT_PROG $SCSI_DEBUG_MNT >>$seqres.full 2>&1
+	_put_scsi_debug_dev
+	rm -f $tmp.*
+}
+
+. ./common/filter
+. ./common/scsi_debug
+
+# We don't actually use the test device, but we need a block based fs
+_require_test
+_require_block_device $TEST_DEV
+_supported_fs generic
+_require_scsi_debug
+
+SCSI_DEBUG_DEV=`_get_scsi_debug_dev 512 512 0 256`
+test -b "$SCSI_DEBUG_DEV" || _notrun "Failed to initialize scsi debug device"
+echo "SCSI debug device $SCSI_DEBUG_DEV" >>$seqres.full
+
+run_check _mkfs_dev $SCSI_DEBUG_DEV
+
+SCSI_DEBUG_MNT="$TEST_DIR/scsi_debug_$seq"
+rm -rf $SCSI_DEBUG_MNT
+mkdir $SCSI_DEBUG_MNT
+run_check _mount $SCSI_DEBUG_DEV $SCSI_DEBUG_MNT
+
+# create a test file
+$XFS_IO_PROG -f -c "pwrite 0 1M" -c "fsync" $SCSI_DEBUG_MNT/testfile >>$seqres.full
+
+# open a file descriptor for reading the file
+exec 3< $SCSI_DEBUG_MNT/testfile
+
+# drop all caches and delete the scsi debug device
+echo 3 > /proc/sys/vm/drop_caches
+echo 1 > /sys/block/`_short_dev $SCSI_DEBUG_DEV`/device/delete
+
+# try to read from the file, which should give us -EIO
+cat <&3 > /dev/null
+
+# close the file descriptor to not block unmount
+exec 3<&-
+
+status=0
+exit
diff --git a/tests/generic/731.out b/tests/generic/731.out
new file mode 100644
index 00000000..102c0522
--- /dev/null
+++ b/tests/generic/731.out
@@ -0,0 +1,2 @@
+QA output created by 731
+cat: -: Input/output error
-- 
2.39.2

Re: [PATCH 2/2] generic: add a test for device removal without dirty data

[Darrick J. Wong]

On Mon, Jul 24, 2023 at 08:29:27AM -0700, Christoph Hellwig wrote:
> Test the removal of the underlying device when the file system still
> does not have dirty data.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Looks good, yay functional testing :)
Reviewed-by: Darrick J. Wong <djwong@kernel.org>

--D

> ---
>  tests/generic/731     | 58 +++++++++++++++++++++++++++++++++++++++++++
>  tests/generic/731.out |  2 ++
>  2 files changed, 60 insertions(+)
>  create mode 100755 tests/generic/731
>  create mode 100644 tests/generic/731.out
> 
> diff --git a/tests/generic/731 b/tests/generic/731
> new file mode 100755
> index 00000000..e1400d06
> --- /dev/null
> +++ b/tests/generic/731
> @@ -0,0 +1,58 @@
> +#! /bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright (c) 2015 Red Hat Inc. All Rights Reserved.
> +# Copyright (c) 2023 Christoph Hellwig
> +#
> +# Test proper file system shut down when the block device is removed underneath
> +# and it has no dirty data.
> +#
> +#
> +. ./common/preamble
> +_begin_fstest auto quick
> +
> +_cleanup()
> +{
> +	cd /
> +	$UMOUNT_PROG $SCSI_DEBUG_MNT >>$seqres.full 2>&1
> +	_put_scsi_debug_dev
> +	rm -f $tmp.*
> +}
> +
> +. ./common/filter
> +. ./common/scsi_debug
> +
> +# We don't actually use the test device, but we need a block based fs
> +_require_test
> +_require_block_device $TEST_DEV
> +_supported_fs generic
> +_require_scsi_debug
> +
> +SCSI_DEBUG_DEV=`_get_scsi_debug_dev 512 512 0 256`
> +test -b "$SCSI_DEBUG_DEV" || _notrun "Failed to initialize scsi debug device"
> +echo "SCSI debug device $SCSI_DEBUG_DEV" >>$seqres.full
> +
> +run_check _mkfs_dev $SCSI_DEBUG_DEV
> +
> +SCSI_DEBUG_MNT="$TEST_DIR/scsi_debug_$seq"
> +rm -rf $SCSI_DEBUG_MNT
> +mkdir $SCSI_DEBUG_MNT
> +run_check _mount $SCSI_DEBUG_DEV $SCSI_DEBUG_MNT
> +
> +# create a test file
> +$XFS_IO_PROG -f -c "pwrite 0 1M" -c "fsync" $SCSI_DEBUG_MNT/testfile >>$seqres.full
> +
> +# open a file descriptor for reading the file
> +exec 3< $SCSI_DEBUG_MNT/testfile
> +
> +# drop all caches and delete the scsi debug device
> +echo 3 > /proc/sys/vm/drop_caches
> +echo 1 > /sys/block/`_short_dev $SCSI_DEBUG_DEV`/device/delete
> +
> +# try to read from the file, which should give us -EIO
> +cat <&3 > /dev/null
> +
> +# close the file descriptor to not block unmount
> +exec 3<&-
> +
> +status=0
> +exit
> diff --git a/tests/generic/731.out b/tests/generic/731.out
> new file mode 100644
> index 00000000..102c0522
> --- /dev/null
> +++ b/tests/generic/731.out
> @@ -0,0 +1,2 @@
> +QA output created by 731
> +cat: -: Input/output error
> -- 
> 2.39.2
> 

add device removal test

[Christoph Hellwig]

Hi all,

this series adds two tests for removing a device underneath the
file system.  This covers the new shutdown handling series I'm
posting.

[PATCH 2/2] generic: add a test for device removal without dirty data

[Christoph Hellwig]

Test the removal of the underlying device when the file system still
does not have dirty data.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 tests/generic/730     | 55 +++++++++++++++++++++++++++++++++++++++++++
 tests/generic/730.out |  2 ++
 2 files changed, 57 insertions(+)
 create mode 100755 tests/generic/730
 create mode 100644 tests/generic/730.out

diff --git a/tests/generic/730 b/tests/generic/730
new file mode 100755
index 00000000..7f795da3
--- /dev/null
+++ b/tests/generic/730
@@ -0,0 +1,55 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2015 Red Hat Inc. All Rights Reserved.
+# Copyright (c) 2023 Christoph Hellwig
+#
+# Test proper file system shut down when the block device is removed underneath
+# and it has no dirty data.
+#
+#
+. ./common/preamble
+_begin_fstest auto quick
+
+_cleanup()
+{
+	cd /
+	$UMOUNT_PROG $SCRATCH_MNT >>$seqres.full 2>&1
+	_put_scsi_debug_dev
+	rm -f $tmp.*
+}
+
+. ./common/filter
+. ./common/scsi_debug
+
+_supported_fs generic
+_require_scsi_debug
+
+physical=`blockdev --getpbsz $SCRATCH_DEV`
+logical=`blockdev --getss $SCRATCH_DEV`
+
+SCSI_DEBUG_DEV=`_get_scsi_debug_dev ${physical:-512} ${logical:-512} 0 300`
+test -b "$SCSI_DEBUG_DEV" || _notrun "Failed to initialize scsi debug device"
+echo "SCSI debug device $SCSI_DEBUG_DEV" >>$seqres.full
+
+_mkfs_dev $SCSI_DEBUG_DEV
+
+_mount $SCSI_DEBUG_DEV $SCRATCH_MNT
+
+# create a test file
+$XFS_IO_PROG -f -c "pwrite 0 1M" -c "fsync" $SCRATCH_MNT/testfile >>$seqres.full
+
+# open a file descriptor for reading the file
+exec 3< $SCRATCH_MNT/testfile
+
+# drop all caches and delete the scsi debug device
+echo 3 > /proc/sys/vm/drop_caches
+echo 1 > /sys/block/`_short_dev $SCSI_DEBUG_DEV`/device/delete
+
+# try to read from the file, which should give us -EIO
+cat <&3 > /dev/null
+
+# close the file descriptor to not block unmount
+exec 3<&-
+
+status=0
+exit
diff --git a/tests/generic/730.out b/tests/generic/730.out
new file mode 100644
index 00000000..79e96db8
--- /dev/null
+++ b/tests/generic/730.out
@@ -0,0 +1,2 @@
+QA output created by 730
+cat: -: Input/output error
-- 
2.39.2