diff mbox series

[1/3] fuzzy: enhance scrub stress testing to use fsx

Message ID 167243837785.695156.13821918047950372871.stgit@magnolia (mailing list archive)
State New, archived
Headers show
Series fstests: refactor GETFSMAP stress tests | expand

Commit Message

Darrick J. Wong Dec. 30, 2022, 10:12 p.m. UTC 
From: Darrick J. Wong <djwong@kernel.org>

Add a couple of new online fsck stress tests that race fsx against
online fsck.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
---
 common/fuzzy      |   39 ++++++++++++++++++++++++++++++++++++---
 tests/xfs/847     |   38 ++++++++++++++++++++++++++++++++++++++
 tests/xfs/847.out |    2 ++
 tests/xfs/848     |   38 ++++++++++++++++++++++++++++++++++++++
 tests/xfs/848.out |    2 ++
 5 files changed, 116 insertions(+), 3 deletions(-)
 create mode 100755 tests/xfs/847
 create mode 100644 tests/xfs/847.out
 create mode 100755 tests/xfs/848
 create mode 100644 tests/xfs/848.out

Comments

Zorro Lang Jan. 5, 2023, 5:49 a.m. UTC | #1 
On Fri, Dec 30, 2022 at 02:12:57PM -0800, Darrick J. Wong wrote:
> From: Darrick J. Wong <djwong@kernel.org>
> 
> Add a couple of new online fsck stress tests that race fsx against
> online fsck.
> 
> Signed-off-by: Darrick J. Wong <djwong@kernel.org>
> ---
>  common/fuzzy      |   39 ++++++++++++++++++++++++++++++++++++---
>  tests/xfs/847     |   38 ++++++++++++++++++++++++++++++++++++++
>  tests/xfs/847.out |    2 ++
>  tests/xfs/848     |   38 ++++++++++++++++++++++++++++++++++++++
>  tests/xfs/848.out |    2 ++
>  5 files changed, 116 insertions(+), 3 deletions(-)
>  create mode 100755 tests/xfs/847
>  create mode 100644 tests/xfs/847.out
>  create mode 100755 tests/xfs/848
>  create mode 100644 tests/xfs/848.out
> 
> 
> diff --git a/common/fuzzy b/common/fuzzy
> index 1df51a6dd8..3512e95e02 100644
> --- a/common/fuzzy
> +++ b/common/fuzzy
> @@ -408,6 +408,30 @@ __stress_scrub_clean_scratch() {
>  	return 0
>  }
>  
> +# Run fsx while we're testing online fsck.
> +__stress_scrub_fsx_loop() {
> +	local end="$1"
> +	local runningfile="$2"
> +	local focus=(-q -X)	# quiet, validate file contents
> +
> +	# As of November 2022, 2 million fsx ops should be enough to keep
> +	# any filesystem busy for a couple of hours.
> +	focus+=(-N 2000000)
> +	focus+=(-o $((128000 * LOAD_FACTOR)) )
> +	focus+=(-l $((600000 * LOAD_FACTOR)) )
> +
> +	local args="$FSX_AVOID ${focus[@]} ${SCRATCH_MNT}/fsx.$seq"
> +	echo "Running $here/ltp/fsx $args" >> $seqres.full
> +
> +	while __stress_scrub_running "$end" "$runningfile"; do
> +		# Need to recheck running conditions if we cleared anything
> +		__stress_scrub_clean_scratch && continue
> +		$here/ltp/fsx $args >> $seqres.full
> +		echo "fsx exits with $? at $(date)" >> $seqres.full
> +	done
> +	rm -f "$runningfile"
> +}
> +
>  # Run fsstress while we're testing online fsck.
>  __stress_scrub_fsstress_loop() {
>  	local end="$1"
> @@ -454,7 +478,7 @@ _scratch_xfs_stress_scrub_cleanup() {
>  	# Send SIGINT so that bash won't print a 'Terminated' message that
>  	# distorts the golden output.
>  	echo "Killing stressor processes at $(date)" >> $seqres.full
> -	$KILLALL_PROG -INT xfs_io fsstress >> $seqres.full 2>&1
> +	$KILLALL_PROG -INT xfs_io fsstress fsx >> $seqres.full 2>&1
>  
>  	# Tests are not allowed to exit with the scratch fs frozen.  If we
>  	# started a fs freeze/thaw background loop, wait for that loop to exit
> @@ -522,30 +546,39 @@ __stress_scrub_check_commands() {
>  # -w	Delay the start of the scrub/repair loop by this number of seconds.
>  #	Defaults to no delay unless XFS_SCRUB_STRESS_DELAY is set.  This value
>  #	will be clamped to ten seconds before the end time.
> +# -X	Run this program to exercise the filesystem.  Currently supported
> +#       options are 'fsx' and 'fsstress'.  The default is 'fsstress'.
>  _scratch_xfs_stress_scrub() {
>  	local one_scrub_args=()
>  	local scrub_tgt="$SCRATCH_MNT"
>  	local runningfile="$tmp.fsstress"
>  	local freeze="${XFS_SCRUB_STRESS_FREEZE}"
>  	local scrub_delay="${XFS_SCRUB_STRESS_DELAY:--1}"
> +	local exerciser="fsstress"
>  
>  	__SCRUB_STRESS_FREEZE_PID=""
>  	rm -f "$runningfile"
>  	touch "$runningfile"
>  
>  	OPTIND=1
> -	while getopts "fs:t:w:" c; do
> +	while getopts "fs:t:w:X:" c; do
>  		case "$c" in
>  			f) freeze=yes;;
>  			s) one_scrub_args+=("$OPTARG");;
>  			t) scrub_tgt="$OPTARG";;
>  			w) scrub_delay="$OPTARG";;
> +			X) exerciser="$OPTARG";;
>  			*) return 1; ;;
>  		esac
>  	done
>  
>  	__stress_scrub_check_commands "$scrub_tgt" "${one_scrub_args[@]}"
>  
> +	if ! command -v "__stress_scrub_${exerciser}_loop" &>/dev/null; then
> +		echo "${exerciser}: Unknown fs exercise program."
> +		return 1
> +	fi
> +
>  	local start="$(date +%s)"
>  	local end="$((start + (30 * TIME_FACTOR) ))"
>  	local scrub_startat="$((start + scrub_delay))"
> @@ -555,7 +588,7 @@ _scratch_xfs_stress_scrub() {
>  	echo "Loop started at $(date --date="@${start}")," \
>  		   "ending at $(date --date="@${end}")" >> $seqres.full
>  
> -	__stress_scrub_fsstress_loop "$end" "$runningfile" &
> +	"__stress_scrub_${exerciser}_loop" "$end" "$runningfile" &
>  
>  	if [ -n "$freeze" ]; then
>  		__stress_scrub_freeze_loop "$end" "$runningfile" &
> diff --git a/tests/xfs/847 b/tests/xfs/847
> new file mode 100755
> index 0000000000..856e9a6c26
> --- /dev/null
> +++ b/tests/xfs/847
> @@ -0,0 +1,38 @@
> +#! /bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright (c) 2022 Oracle, Inc.  All Rights Reserved.
> +#
> +# FS QA Test No. 847
> +#
> +# Race fsx and xfs_scrub in read-only mode for a while to see if we crash
> +# or livelock.
> +#
> +. ./common/preamble
> +_begin_fstest scrub dangerous_fsstress_scrub

Hi Darrick,

Such huge patchsets :) I'll try to review them one by one (patchset).

Now I'm trying to review "[NYE DELUGE 1/4]", but I can't find the
"dangerous_fsstress_scrub" group in the whole patchsets. Is there any
prepositive patch(set)? Or you'd like to use "dangerous_fsstress_repair"?

P.S: More cases use "dangerous_fsstress_scrub" in your new patchsets.

Thanks,
Zorro

> +
> +_cleanup() {
> +	cd /
> +	_scratch_xfs_stress_scrub_cleanup &> /dev/null
> +	rm -r -f $tmp.*
> +}
> +_register_cleanup "_cleanup" BUS
> +
> +# Import common functions.
> +. ./common/filter
> +. ./common/fuzzy
> +. ./common/inject
> +. ./common/xfs
> +
> +# real QA test starts here
> +_supported_fs xfs
> +_require_scratch
> +_require_xfs_stress_scrub
> +
> +_scratch_mkfs > "$seqres.full" 2>&1
> +_scratch_mount
> +_scratch_xfs_stress_scrub -S '-n' -X 'fsx'
> +
> +# success, all done
> +echo Silence is golden
> +status=0
> +exit
> diff --git a/tests/xfs/847.out b/tests/xfs/847.out
> new file mode 100644
> index 0000000000..b7041db159
> --- /dev/null
> +++ b/tests/xfs/847.out
> @@ -0,0 +1,2 @@
> +QA output created by 847
> +Silence is golden
> diff --git a/tests/xfs/848 b/tests/xfs/848
> new file mode 100755
> index 0000000000..ab32020624
> --- /dev/null
> +++ b/tests/xfs/848
> @@ -0,0 +1,38 @@
> +#! /bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright (c) 2022 Oracle, Inc.  All Rights Reserved.
> +#
> +# FS QA Test No. 848
> +#
> +# Race fsx and xfs_scrub in force-repair mode for a while to see if we
> +# crash or livelock.
> +#
> +. ./common/preamble
> +_begin_fstest online_repair dangerous_fsstress_repair
> +
> +_cleanup() {
> +	cd /
> +	_scratch_xfs_stress_scrub_cleanup &> /dev/null
> +	rm -r -f $tmp.*
> +}
> +_register_cleanup "_cleanup" BUS
> +
> +# Import common functions.
> +. ./common/filter
> +. ./common/fuzzy
> +. ./common/inject
> +. ./common/xfs
> +
> +# real QA test starts here
> +_supported_fs xfs
> +_require_scratch
> +_require_xfs_stress_online_repair
> +
> +_scratch_mkfs > "$seqres.full" 2>&1
> +_scratch_mount
> +_scratch_xfs_stress_online_repair -S '-k' -X 'fsx'
> +
> +# success, all done
> +echo Silence is golden
> +status=0
> +exit
> diff --git a/tests/xfs/848.out b/tests/xfs/848.out
> new file mode 100644
> index 0000000000..23f674045c
> --- /dev/null
> +++ b/tests/xfs/848.out
> @@ -0,0 +1,2 @@
> +QA output created by 848
> +Silence is golden
>
Darrick J. Wong Jan. 5, 2023, 6:28 p.m. UTC | #2 
On Thu, Jan 05, 2023 at 01:49:20PM +0800, Zorro Lang wrote:
> On Fri, Dec 30, 2022 at 02:12:57PM -0800, Darrick J. Wong wrote:
> > From: Darrick J. Wong <djwong@kernel.org>
> > 
> > Add a couple of new online fsck stress tests that race fsx against
> > online fsck.
> > 
> > Signed-off-by: Darrick J. Wong <djwong@kernel.org>
> > ---
> >  common/fuzzy      |   39 ++++++++++++++++++++++++++++++++++++---
> >  tests/xfs/847     |   38 ++++++++++++++++++++++++++++++++++++++
> >  tests/xfs/847.out |    2 ++
> >  tests/xfs/848     |   38 ++++++++++++++++++++++++++++++++++++++
> >  tests/xfs/848.out |    2 ++
> >  5 files changed, 116 insertions(+), 3 deletions(-)
> >  create mode 100755 tests/xfs/847
> >  create mode 100644 tests/xfs/847.out
> >  create mode 100755 tests/xfs/848
> >  create mode 100644 tests/xfs/848.out
> > 
> > 
> > diff --git a/common/fuzzy b/common/fuzzy
> > index 1df51a6dd8..3512e95e02 100644
> > --- a/common/fuzzy
> > +++ b/common/fuzzy
> > @@ -408,6 +408,30 @@ __stress_scrub_clean_scratch() {
> >  	return 0
> >  }
> >  
> > +# Run fsx while we're testing online fsck.
> > +__stress_scrub_fsx_loop() {
> > +	local end="$1"
> > +	local runningfile="$2"
> > +	local focus=(-q -X)	# quiet, validate file contents
> > +
> > +	# As of November 2022, 2 million fsx ops should be enough to keep
> > +	# any filesystem busy for a couple of hours.
> > +	focus+=(-N 2000000)
> > +	focus+=(-o $((128000 * LOAD_FACTOR)) )
> > +	focus+=(-l $((600000 * LOAD_FACTOR)) )
> > +
> > +	local args="$FSX_AVOID ${focus[@]} ${SCRATCH_MNT}/fsx.$seq"
> > +	echo "Running $here/ltp/fsx $args" >> $seqres.full
> > +
> > +	while __stress_scrub_running "$end" "$runningfile"; do
> > +		# Need to recheck running conditions if we cleared anything
> > +		__stress_scrub_clean_scratch && continue
> > +		$here/ltp/fsx $args >> $seqres.full
> > +		echo "fsx exits with $? at $(date)" >> $seqres.full
> > +	done
> > +	rm -f "$runningfile"
> > +}
> > +
> >  # Run fsstress while we're testing online fsck.
> >  __stress_scrub_fsstress_loop() {
> >  	local end="$1"
> > @@ -454,7 +478,7 @@ _scratch_xfs_stress_scrub_cleanup() {
> >  	# Send SIGINT so that bash won't print a 'Terminated' message that
> >  	# distorts the golden output.
> >  	echo "Killing stressor processes at $(date)" >> $seqres.full
> > -	$KILLALL_PROG -INT xfs_io fsstress >> $seqres.full 2>&1
> > +	$KILLALL_PROG -INT xfs_io fsstress fsx >> $seqres.full 2>&1
> >  
> >  	# Tests are not allowed to exit with the scratch fs frozen.  If we
> >  	# started a fs freeze/thaw background loop, wait for that loop to exit
> > @@ -522,30 +546,39 @@ __stress_scrub_check_commands() {
> >  # -w	Delay the start of the scrub/repair loop by this number of seconds.
> >  #	Defaults to no delay unless XFS_SCRUB_STRESS_DELAY is set.  This value
> >  #	will be clamped to ten seconds before the end time.
> > +# -X	Run this program to exercise the filesystem.  Currently supported
> > +#       options are 'fsx' and 'fsstress'.  The default is 'fsstress'.
> >  _scratch_xfs_stress_scrub() {
> >  	local one_scrub_args=()
> >  	local scrub_tgt="$SCRATCH_MNT"
> >  	local runningfile="$tmp.fsstress"
> >  	local freeze="${XFS_SCRUB_STRESS_FREEZE}"
> >  	local scrub_delay="${XFS_SCRUB_STRESS_DELAY:--1}"
> > +	local exerciser="fsstress"
> >  
> >  	__SCRUB_STRESS_FREEZE_PID=""
> >  	rm -f "$runningfile"
> >  	touch "$runningfile"
> >  
> >  	OPTIND=1
> > -	while getopts "fs:t:w:" c; do
> > +	while getopts "fs:t:w:X:" c; do
> >  		case "$c" in
> >  			f) freeze=yes;;
> >  			s) one_scrub_args+=("$OPTARG");;
> >  			t) scrub_tgt="$OPTARG";;
> >  			w) scrub_delay="$OPTARG";;
> > +			X) exerciser="$OPTARG";;
> >  			*) return 1; ;;
> >  		esac
> >  	done
> >  
> >  	__stress_scrub_check_commands "$scrub_tgt" "${one_scrub_args[@]}"
> >  
> > +	if ! command -v "__stress_scrub_${exerciser}_loop" &>/dev/null; then
> > +		echo "${exerciser}: Unknown fs exercise program."
> > +		return 1
> > +	fi
> > +
> >  	local start="$(date +%s)"
> >  	local end="$((start + (30 * TIME_FACTOR) ))"
> >  	local scrub_startat="$((start + scrub_delay))"
> > @@ -555,7 +588,7 @@ _scratch_xfs_stress_scrub() {
> >  	echo "Loop started at $(date --date="@${start}")," \
> >  		   "ending at $(date --date="@${end}")" >> $seqres.full
> >  
> > -	__stress_scrub_fsstress_loop "$end" "$runningfile" &
> > +	"__stress_scrub_${exerciser}_loop" "$end" "$runningfile" &
> >  
> >  	if [ -n "$freeze" ]; then
> >  		__stress_scrub_freeze_loop "$end" "$runningfile" &
> > diff --git a/tests/xfs/847 b/tests/xfs/847
> > new file mode 100755
> > index 0000000000..856e9a6c26
> > --- /dev/null
> > +++ b/tests/xfs/847
> > @@ -0,0 +1,38 @@
> > +#! /bin/bash
> > +# SPDX-License-Identifier: GPL-2.0
> > +# Copyright (c) 2022 Oracle, Inc.  All Rights Reserved.
> > +#
> > +# FS QA Test No. 847
> > +#
> > +# Race fsx and xfs_scrub in read-only mode for a while to see if we crash
> > +# or livelock.
> > +#
> > +. ./common/preamble
> > +_begin_fstest scrub dangerous_fsstress_scrub
> 
> Hi Darrick,
> 
> Such huge patchsets :) I'll try to review them one by one (patchset).
> 
> Now I'm trying to review "[NYE DELUGE 1/4]", but I can't find the
> "dangerous_fsstress_scrub" group in the whole patchsets. Is there any
> prepositive patch(set)? Or you'd like to use "dangerous_fsstress_repair"?
> 
> P.S: More cases use "dangerous_fsstress_scrub" in your new patchsets.

Oops.  The group was originally added in "xfs: race fsstress with online
scrubbers for AG and fs metadata".  Then I created a few more patches at
the top of my stack, tested that, and then decided that their proper
placement was closer to the bottom than the patch that added the group.

Ok, I'll modify the build system to shellcheck any bash scripts in the
current commit (because running it on the full repo took hours and
produced many hundreds of errors, mostly in tests/btrfs/) and go do a
push-and-build of all three stgit repos.

--D

> Thanks,
> Zorro
> 
> > +
> > +_cleanup() {
> > +	cd /
> > +	_scratch_xfs_stress_scrub_cleanup &> /dev/null
> > +	rm -r -f $tmp.*
> > +}
> > +_register_cleanup "_cleanup" BUS
> > +
> > +# Import common functions.
> > +. ./common/filter
> > +. ./common/fuzzy
> > +. ./common/inject
> > +. ./common/xfs
> > +
> > +# real QA test starts here
> > +_supported_fs xfs
> > +_require_scratch
> > +_require_xfs_stress_scrub
> > +
> > +_scratch_mkfs > "$seqres.full" 2>&1
> > +_scratch_mount
> > +_scratch_xfs_stress_scrub -S '-n' -X 'fsx'
> > +
> > +# success, all done
> > +echo Silence is golden
> > +status=0
> > +exit
> > diff --git a/tests/xfs/847.out b/tests/xfs/847.out
> > new file mode 100644
> > index 0000000000..b7041db159
> > --- /dev/null
> > +++ b/tests/xfs/847.out
> > @@ -0,0 +1,2 @@
> > +QA output created by 847
> > +Silence is golden
> > diff --git a/tests/xfs/848 b/tests/xfs/848
> > new file mode 100755
> > index 0000000000..ab32020624
> > --- /dev/null
> > +++ b/tests/xfs/848
> > @@ -0,0 +1,38 @@
> > +#! /bin/bash
> > +# SPDX-License-Identifier: GPL-2.0
> > +# Copyright (c) 2022 Oracle, Inc.  All Rights Reserved.
> > +#
> > +# FS QA Test No. 848
> > +#
> > +# Race fsx and xfs_scrub in force-repair mode for a while to see if we
> > +# crash or livelock.
> > +#
> > +. ./common/preamble
> > +_begin_fstest online_repair dangerous_fsstress_repair
> > +
> > +_cleanup() {
> > +	cd /
> > +	_scratch_xfs_stress_scrub_cleanup &> /dev/null
> > +	rm -r -f $tmp.*
> > +}
> > +_register_cleanup "_cleanup" BUS
> > +
> > +# Import common functions.
> > +. ./common/filter
> > +. ./common/fuzzy
> > +. ./common/inject
> > +. ./common/xfs
> > +
> > +# real QA test starts here
> > +_supported_fs xfs
> > +_require_scratch
> > +_require_xfs_stress_online_repair
> > +
> > +_scratch_mkfs > "$seqres.full" 2>&1
> > +_scratch_mount
> > +_scratch_xfs_stress_online_repair -S '-k' -X 'fsx'
> > +
> > +# success, all done
> > +echo Silence is golden
> > +status=0
> > +exit
> > diff --git a/tests/xfs/848.out b/tests/xfs/848.out
> > new file mode 100644
> > index 0000000000..23f674045c
> > --- /dev/null
> > +++ b/tests/xfs/848.out
> > @@ -0,0 +1,2 @@
> > +QA output created by 848
> > +Silence is golden
> > 
>
diff mbox series

Patch

diff --git a/common/fuzzy b/common/fuzzy
index 1df51a6dd8..3512e95e02 100644
--- a/common/fuzzy
+++ b/common/fuzzy
@@ -408,6 +408,30 @@  __stress_scrub_clean_scratch() {
 	return 0
 }
 
+# Run fsx while we're testing online fsck.
+__stress_scrub_fsx_loop() {
+	local end="$1"
+	local runningfile="$2"
+	local focus=(-q -X)	# quiet, validate file contents
+
+	# As of November 2022, 2 million fsx ops should be enough to keep
+	# any filesystem busy for a couple of hours.
+	focus+=(-N 2000000)
+	focus+=(-o $((128000 * LOAD_FACTOR)) )
+	focus+=(-l $((600000 * LOAD_FACTOR)) )
+
+	local args="$FSX_AVOID ${focus[@]} ${SCRATCH_MNT}/fsx.$seq"
+	echo "Running $here/ltp/fsx $args" >> $seqres.full
+
+	while __stress_scrub_running "$end" "$runningfile"; do
+		# Need to recheck running conditions if we cleared anything
+		__stress_scrub_clean_scratch && continue
+		$here/ltp/fsx $args >> $seqres.full
+		echo "fsx exits with $? at $(date)" >> $seqres.full
+	done
+	rm -f "$runningfile"
+}
+
 # Run fsstress while we're testing online fsck.
 __stress_scrub_fsstress_loop() {
 	local end="$1"
@@ -454,7 +478,7 @@  _scratch_xfs_stress_scrub_cleanup() {
 	# Send SIGINT so that bash won't print a 'Terminated' message that
 	# distorts the golden output.
 	echo "Killing stressor processes at $(date)" >> $seqres.full
-	$KILLALL_PROG -INT xfs_io fsstress >> $seqres.full 2>&1
+	$KILLALL_PROG -INT xfs_io fsstress fsx >> $seqres.full 2>&1
 
 	# Tests are not allowed to exit with the scratch fs frozen.  If we
 	# started a fs freeze/thaw background loop, wait for that loop to exit
@@ -522,30 +546,39 @@  __stress_scrub_check_commands() {
 # -w	Delay the start of the scrub/repair loop by this number of seconds.
 #	Defaults to no delay unless XFS_SCRUB_STRESS_DELAY is set.  This value
 #	will be clamped to ten seconds before the end time.
+# -X	Run this program to exercise the filesystem.  Currently supported
+#       options are 'fsx' and 'fsstress'.  The default is 'fsstress'.
 _scratch_xfs_stress_scrub() {
 	local one_scrub_args=()
 	local scrub_tgt="$SCRATCH_MNT"
 	local runningfile="$tmp.fsstress"
 	local freeze="${XFS_SCRUB_STRESS_FREEZE}"
 	local scrub_delay="${XFS_SCRUB_STRESS_DELAY:--1}"
+	local exerciser="fsstress"
 
 	__SCRUB_STRESS_FREEZE_PID=""
 	rm -f "$runningfile"
 	touch "$runningfile"
 
 	OPTIND=1
-	while getopts "fs:t:w:" c; do
+	while getopts "fs:t:w:X:" c; do
 		case "$c" in
 			f) freeze=yes;;
 			s) one_scrub_args+=("$OPTARG");;
 			t) scrub_tgt="$OPTARG";;
 			w) scrub_delay="$OPTARG";;
+			X) exerciser="$OPTARG";;
 			*) return 1; ;;
 		esac
 	done
 
 	__stress_scrub_check_commands "$scrub_tgt" "${one_scrub_args[@]}"
 
+	if ! command -v "__stress_scrub_${exerciser}_loop" &>/dev/null; then
+		echo "${exerciser}: Unknown fs exercise program."
+		return 1
+	fi
+
 	local start="$(date +%s)"
 	local end="$((start + (30 * TIME_FACTOR) ))"
 	local scrub_startat="$((start + scrub_delay))"
@@ -555,7 +588,7 @@  _scratch_xfs_stress_scrub() {
 	echo "Loop started at $(date --date="@${start}")," \
 		   "ending at $(date --date="@${end}")" >> $seqres.full
 
-	__stress_scrub_fsstress_loop "$end" "$runningfile" &
+	"__stress_scrub_${exerciser}_loop" "$end" "$runningfile" &
 
 	if [ -n "$freeze" ]; then
 		__stress_scrub_freeze_loop "$end" "$runningfile" &
diff --git a/tests/xfs/847 b/tests/xfs/847
new file mode 100755
index 0000000000..856e9a6c26
--- /dev/null
+++ b/tests/xfs/847
@@ -0,0 +1,38 @@ 
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2022 Oracle, Inc.  All Rights Reserved.
+#
+# FS QA Test No. 847
+#
+# Race fsx and xfs_scrub in read-only mode for a while to see if we crash
+# or livelock.
+#
+. ./common/preamble
+_begin_fstest scrub dangerous_fsstress_scrub
+
+_cleanup() {
+	cd /
+	_scratch_xfs_stress_scrub_cleanup &> /dev/null
+	rm -r -f $tmp.*
+}
+_register_cleanup "_cleanup" BUS
+
+# Import common functions.
+. ./common/filter
+. ./common/fuzzy
+. ./common/inject
+. ./common/xfs
+
+# real QA test starts here
+_supported_fs xfs
+_require_scratch
+_require_xfs_stress_scrub
+
+_scratch_mkfs > "$seqres.full" 2>&1
+_scratch_mount
+_scratch_xfs_stress_scrub -S '-n' -X 'fsx'
+
+# success, all done
+echo Silence is golden
+status=0
+exit
diff --git a/tests/xfs/847.out b/tests/xfs/847.out
new file mode 100644
index 0000000000..b7041db159
--- /dev/null
+++ b/tests/xfs/847.out
@@ -0,0 +1,2 @@ 
+QA output created by 847
+Silence is golden
diff --git a/tests/xfs/848 b/tests/xfs/848
new file mode 100755
index 0000000000..ab32020624
--- /dev/null
+++ b/tests/xfs/848
@@ -0,0 +1,38 @@ 
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2022 Oracle, Inc.  All Rights Reserved.
+#
+# FS QA Test No. 848
+#
+# Race fsx and xfs_scrub in force-repair mode for a while to see if we
+# crash or livelock.
+#
+. ./common/preamble
+_begin_fstest online_repair dangerous_fsstress_repair
+
+_cleanup() {
+	cd /
+	_scratch_xfs_stress_scrub_cleanup &> /dev/null
+	rm -r -f $tmp.*
+}
+_register_cleanup "_cleanup" BUS
+
+# Import common functions.
+. ./common/filter
+. ./common/fuzzy
+. ./common/inject
+. ./common/xfs
+
+# real QA test starts here
+_supported_fs xfs
+_require_scratch
+_require_xfs_stress_online_repair
+
+_scratch_mkfs > "$seqres.full" 2>&1
+_scratch_mount
+_scratch_xfs_stress_online_repair -S '-k' -X 'fsx'
+
+# success, all done
+echo Silence is golden
+status=0
+exit
diff --git a/tests/xfs/848.out b/tests/xfs/848.out
new file mode 100644
index 0000000000..23f674045c
--- /dev/null
+++ b/tests/xfs/848.out
@@ -0,0 +1,2 @@ 
+QA output created by 848
+Silence is golden