[PATCH v4 0/5] check: add option to rerun failed tests

[PATCH v4 0/5] check: add option to rerun failed tests

[David Disseldorp]

This patchset adds support to loop on failed tests, as proposed by
Ted Ts'o in https://lwn.net/Articles/897061/:
  add a mode that will immediately rerun a failed test 25 or 100 times
  to establish a failure percentage.

Changes since (v3), following Darrick's review:
- extended full/out.bad/etc. retention to cover more paths and remove
  stale .rerun# files

Changes since (v2), following Darrick's review:
- dropped RFC flag
- rebased atop v2022.07.03
- simplified test iterator
  + results stashed at the end of each iteration, rather than start of
    next / loop-exit
- dropped aggregate loop stats message from xunit report
- squashed full/dmesg/out.bad file retention patch with rerun patch

Changes since (v1):
- rebased atop upstream v2022.06.26
- added a few extra cleanup commits
- append details for every rerun to xunit output
  + provide aggregate stats via <testcase status=X>
- extend _stash_test_status to call report hook, as well as save failure
  artifacts with a .rerun# suffix

Diffstat:
 check         | 137 +++++++++++++++++++++++++++++++++++++-------------
 common/report |  90 ++++++++++++++++-----------------
 2 files changed, 144 insertions(+), 83 deletions(-)

[PATCH v4 1/5] report: use array for REPORT_ENV_LIST

[David Disseldorp]

There's no need for multiple assignments.

Signed-off-by: David Disseldorp <ddiss@suse.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
---
 common/report | 26 +++++---------------------
 1 file changed, 5 insertions(+), 21 deletions(-)

diff --git a/common/report b/common/report
index 84d9e0a7..2b8285d8 100644
--- a/common/report
+++ b/common/report
@@ -4,26 +4,10 @@
 
 # List of xfstests's enviroment variables to include reports
 ## TODO automate list population inside common/conf
-REPORT_ENV_LIST="$REPORT_ENV_LIST SECTION"
-REPORT_ENV_LIST="$REPORT_ENV_LIST FSTYP"
-REPORT_ENV_LIST="$REPORT_ENV_LIST PLATFORM"
-REPORT_ENV_LIST="$REPORT_ENV_LIST MKFS_OPTIONS"
-REPORT_ENV_LIST="$REPORT_ENV_LIST MOUNT_OPTIONS"
-
-REPORT_ENV_LIST="$REPORT_ENV_LIST HOST_OPTIONS"
-REPORT_ENV_LIST="$REPORT_ENV_LIST CHECK_OPTIONS"
-REPORT_ENV_LIST="$REPORT_ENV_LIST XFS_MKFS_OPTIONS"
-REPORT_ENV_LIST="$REPORT_ENV_LIST TIME_FACTOR"
-REPORT_ENV_LIST="$REPORT_ENV_LIST LOAD_FACTOR"
-
-REPORT_ENV_LIST="$REPORT_ENV_LIST TEST_DIR"
-REPORT_ENV_LIST="$REPORT_ENV_LIST TEST_DEV"
-REPORT_ENV_LIST="$REPORT_ENV_LIST SCRATCH_DEV"
-REPORT_ENV_LIST="$REPORT_ENV_LIST SCRATCH_MNT"
-
-REPORT_ENV_LIST="$REPORT_ENV_LIST OVL_UPPER"
-REPORT_ENV_LIST="$REPORT_ENV_LIST OVL_LOWER"
-REPORT_ENV_LIST="$REPORT_ENV_LIST OVL_WORK"
+REPORT_ENV_LIST=("SECTION" "FSTYP" "PLATFORM" "MKFS_OPTIONS" "MOUNT_OPTIONS" \
+		 "HOST_OPTIONS" "CHECK_OPTIONS" "XFS_MKFS_OPTIONS" \
+		 "TIME_FACTOR" "LOAD_FACTOR" "TEST_DIR" "TEST_DEV" \
+		 "SCRATCH_DEV" "SCRATCH_MNT" "OVL_UPPER" "OVL_LOWER" "OVL_WORK")
 
 encode_xml()
 {
@@ -70,7 +54,7 @@ _xunit_make_section_report()
 
 	# Properties
 	echo -e "\t<properties>" >> $REPORT_DIR/result.xml
-	for p in $REPORT_ENV_LIST;do
+	for p in "${REPORT_ENV_LIST[@]}"; do
 		_xunit_add_property "$p"
 	done
 	echo -e "\t</properties>" >> $REPORT_DIR/result.xml
-- 
2.35.3

[PATCH v4 2/5] report: pass through most details as function parameters

[David Disseldorp]

Report generation currently involves reaching into a whole bunch of
globals for things like section name and start/end times. Pass these
through as explicit function parameters to avoid unintentional breakage.

One minor fix included is the default xunit error message, which used
$sequm instead of $seqnum.

Signed-off-by: David Disseldorp <ddiss@suse.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
---
 check         | 14 +++++++----
 common/report | 64 +++++++++++++++++++++++++++++----------------------
 2 files changed, 47 insertions(+), 31 deletions(-)

diff --git a/check b/check
index 4b0ebad6..dbad6dde 100755
--- a/check
+++ b/check
@@ -432,7 +432,9 @@ _wrapup()
 	if $showme && $needwrap; then
 		if $do_report; then
 			# $showme = all selected tests are notrun (no tries)
-			_make_section_report "${#notrun[*]}" "0" "${#notrun[*]}"
+			_make_section_report "$section" "${#notrun[*]}" "0" \
+					     "${#notrun[*]}" \
+					     "$((sect_stop - sect_start))"
 		fi
 		needwrap=false
 	elif $needwrap; then
@@ -493,7 +495,9 @@ _wrapup()
 		fi
 		echo "" >>$tmp.summary
 		if $do_report; then
-			_make_section_report "${#try[*]}" "${#bad[*]}" "${#notrun[*]}"
+			_make_section_report "$section" "${#try[*]}" \
+					     "${#bad[*]}" "${#notrun[*]}" \
+					     "$((sect_stop - sect_start))"
 		fi
 		needwrap=false
 	fi
@@ -736,7 +740,8 @@ function run_section()
 			bad+=("$seqnum")
 		fi
 		if $do_report && [[ ! $tc_status =~ ^(init|expunge)$ ]]; then
-			_make_testcase_report "$prev_seq" "$tc_status"
+			_make_testcase_report "$section" "$seqnum" \
+					      "$tc_status" "$((stop - start))"
 		fi
 
 		prev_seq="$seq"
@@ -940,7 +945,8 @@ function run_section()
 		bad+=("$seqnum")
 	fi
 	if $do_report && [[ ! $tc_status =~ ^(init|expunge)$ ]]; then
-		_make_testcase_report "$prev_seq" "$tc_status"
+		_make_testcase_report "$section" "$seqnum" "$tc_status" \
+				      "$((stop - start))"
 	fi
 
 	sect_stop=`_wallclock`
diff --git a/common/report b/common/report
index 2b8285d8..5ca41bc4 100644
--- a/common/report
+++ b/common/report
@@ -33,11 +33,11 @@ _xunit_add_property()
 _xunit_make_section_report()
 {
 	# xfstest:section ==> xunit:testsuite
-	local tests_count="$1"
-	local bad_count="$2"
-	local notrun_count="$3"
-	local sect_name=$section
-	local sect_time=`expr $sect_stop - $sect_start`
+	local sect_name="$1"
+	local tests_count="$2"
+	local bad_count="$3"
+	local notrun_count="$4"
+	local sect_time="$5"
 
 	if [ $sect_name == '-no-sections-' ]; then
 		sect_name='global'
@@ -67,12 +67,10 @@ _xunit_make_section_report()
 
 _xunit_make_testcase_report()
 {
-	local test_seq="$1"
-	local test_status="$2"
-	local test_time=`expr $stop - $start`
-	local strip="$SRC_DIR/"
-	local test_name=${test_seq#$strip}
-	local sect_name=$section
+	local sect_name="$1"
+	local test_name="$2"
+	local test_status="$3"
+	local test_time="$4"
 
 	# TODO: other places may also win if no-section mode will be named like 'default/global'
 	if [ $sect_name == '-no-sections-' ]; then
@@ -86,8 +84,9 @@ _xunit_make_testcase_report()
 	"pass")
 		;;
 	"notrun")
-		if [ -f $seqres.notrun ]; then
-			local msg=`cat $seqres.notrun | encode_xml`
+		local notrun_file="${REPORT_DIR}/${test_name}.notrun"
+		if [ -f "$notrun_file" ]; then
+			local msg=`cat "$notrun_file" | encode_xml`
 			echo -e "\t\t<skipped message=\"$msg\" />" >> $report
 		else
 			echo -e "\t\t<skipped/>" >> $report
@@ -97,27 +96,31 @@ _xunit_make_testcase_report()
 		echo -e "\t\t<skipped/>" >> $report
 		;;
 	"fail")
+		local out_src="${SRC_DIR}/${test_name}.out"
+		local full_file="${REPORT_DIR}/${test_name}.full"
+		local dmesg_file="${REPORT_DIR}/${test_name}.dmesg"
+		local outbad_file="${REPORT_DIR}/${test_name}.out.bad"
 		if [ -z "$_err_msg" ]; then
-			_err_msg="Test $sequm failed, reason unknown"
+			_err_msg="Test $test_name failed, reason unknown"
 		fi
 		echo -e "\t\t<failure message=\"$_err_msg\" type=\"TestFail\" />" >> $report
-		if [ -s $seqres.full ]; then
+		if [ -s "$full_file" ]; then
 			echo -e "\t\t<system-out>" >> $report
 			printf	'<![CDATA[\n' >>$report
-			cat $seqres.full | tr -dc '[:print:][:space:]' | encode_xml >>$report
+			cat "$full_file" | tr -dc '[:print:][:space:]' | encode_xml >>$report
 			printf ']]>\n'	>>$report
 			echo -e "\t\t</system-out>" >> $report
 		fi
-		if [ -f $seqres.dmesg ]; then
+		if [ -f "$dmesg_file" ]; then
 			echo -e "\t\t<system-err>" >> $report
 			printf	'<![CDATA[\n' >>$report
-			cat $seqres.dmesg | tr -dc '[:print:][:space:]' | encode_xml >>$report
+			cat "$dmesg_file" | tr -dc '[:print:][:space:]' | encode_xml >>$report
 			printf ']]>\n'	>>$report
 			echo -e "\t\t</system-err>" >> $report
-		elif [ -s $seqres.out.bad ]; then
+		elif [ -s "$outbad_file" ]; then
 			echo -e "\t\t<system-err>" >> $report
 			printf	'<![CDATA[\n' >>$report
-			$diff $test_seq.out $seqres.out.bad | encode_xml >>$report
+			$diff "$out_src" "$outbad_file" | encode_xml >>$report
 			printf ']]>\n'	>>$report
 			echo -e "\t\t</system-err>" >> $report
 		fi
@@ -134,13 +137,17 @@ _xunit_make_testcase_report()
 #  Common report generator entry points
 _make_section_report()
 {
-	local tests_count="$1"
-	local bad_count="$2"
-	local notrun_count="$3"
+	local sect_name="$1"
+	local tests_count="$2"
+	local bad_count="$3"
+	local notrun_count="$4"
+	local sect_time="$5"
 	for report in $REPORT_LIST; do
 		case "$report" in
 		"xunit")
-			_xunit_make_section_report "$tests_count" "$bad_count" "$notrun_count"
+			_xunit_make_section_report "$sect_name" "$tests_count" \
+						   "$bad_count" "$notrun_count" \
+						   "$sect_time"
 			;;
 		*)
 			_dump_err "format '$report' is not supported"
@@ -151,12 +158,15 @@ _make_section_report()
 
 _make_testcase_report()
 {
-	local test_seq="$1"
-	local test_status="$2"
+	local sect_name="$1"
+	local test_seq="$2"
+	local test_status="$3"
+	local test_time="$4"
 	for report in $REPORT_LIST; do
 		case "$report" in
 		"xunit")
-			_xunit_make_testcase_report "$test_seq" "$test_status"
+			_xunit_make_testcase_report "$sect_name" "$test_seq" \
+						    "$test_status" "$test_time"
 			;;
 		*)
 			_dump_err "report format '$report' is not supported"
-- 
2.35.3

[PATCH v4 3/5] check: make a few variables local

[David Disseldorp]

The variables aren't used outside of function scope. Also convert one
timestamp output to use the helper.

Signed-off-by: David Disseldorp <ddiss@suse.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
---
 check | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/check b/check
index dbad6dde..08857f7e 100755
--- a/check
+++ b/check
@@ -179,10 +179,10 @@ get_all_tests()
 # the function from that list.
 trim_test_list()
 {
-	test_list="$*"
+	local test_list="$*"
 
 	rm -f $tmp.grep
-	numsed=0
+	local numsed=0
 	for t in $test_list
 	do
 	    if [ $numsed -gt 100 ]; then
@@ -207,7 +207,7 @@ _wallclock()
 
 _timestamp()
 {
-    now=`date "+%T"`
+    local now=`date "+%T"`
     echo -n " [$now]"
 }
 
@@ -603,7 +603,7 @@ fi
 
 function run_section()
 {
-	local section=$1
+	local section=$1 skip
 
 	OLD_FSTYP=$FSTYP
 	OLD_TEST_FS_MOUNT_OPTS=$TEST_FS_MOUNT_OPTS
@@ -820,7 +820,7 @@ function run_section()
 		rm -f core $seqres.notrun
 
 		start=`_wallclock`
-		$timestamp && echo -n "	["`date "+%T"`"]"
+		$timestamp && _timestamp
 		[ ! -x $seq ] && chmod u+x $seq # ensure we can run it
 		$LOGGER_PROG "run xfstest $seqnum"
 		if [ -w /dev/kmsg ]; then
-- 
2.35.3

[PATCH v4 4/5] check: append bad / notrun arrays in helper function

[David Disseldorp]

Currently the @try, @bad and @notrun arrays are appended with seqnum at
different points in the main run_section() loop:
- @try: shortly prior to test script execution
- @notrun: on list (check -n), or after .notrun flagged test completion
- @bad: at the start of subsequent test loop and loop exit

For future loop-test-following-failure functionality it makes sense to
combine some of these steps. This change moves both @notrun and @bad
appends into a helper function which is called at the end of each loop
iteration.

Signed-off-by: David Disseldorp <ddiss@suse.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
---
 check | 68 ++++++++++++++++++++++++++++++++++-------------------------
 1 file changed, 39 insertions(+), 29 deletions(-)

diff --git a/check b/check
index 08857f7e..6dbdb2a8 100755
--- a/check
+++ b/check
@@ -553,6 +553,32 @@ _expunge_test()
 	return 0
 }
 
+# Retain in @bad / @notrun the result of the just-run @test_seq. @try array
+# entries are added prior to execution.
+_stash_test_status() {
+	local test_seq="$1"
+	local test_status="$2"
+
+	if $do_report && [[ $test_status != "expunge" ]]; then
+		_make_testcase_report "$section" "$test_seq" \
+				      "$test_status" "$((stop - start))"
+	fi
+
+	case "$test_status" in
+	fail)
+		bad+=("$test_seq")
+		;;
+	list|notrun)
+		notrun+=("$test_seq")
+		;;
+	pass|expunge)
+		;;
+	*)
+		echo "Unexpected test $test_seq status: $test_status"
+		;;
+	esac
+}
+
 # Can we run systemd scopes?
 HAVE_SYSTEMD_SCOPES=
 systemctl reset-failed "fstests-check" &>/dev/null
@@ -732,19 +758,8 @@ function run_section()
 	seqres="$check"
 	_check_test_fs
 
-	local tc_status="init"
-	prev_seq=""
+	local tc_status
 	for seq in $list ; do
-		# Run report for previous test!
-		if [ "$tc_status" == "fail" ]; then
-			bad+=("$seqnum")
-		fi
-		if $do_report && [[ ! $tc_status =~ ^(init|expunge)$ ]]; then
-			_make_testcase_report "$section" "$seqnum" \
-					      "$tc_status" "$((stop - start))"
-		fi
-
-		prev_seq="$seq"
 		if [ ! -f $seq ]; then
 			# Try to get full name in case the user supplied only
 			# seq id and the test has a name. A bit of hassle to
@@ -784,20 +799,21 @@ function run_section()
 		if $showme; then
 			_expunge_test $seqnum
 			if [ $? -eq 1 ]; then
-			    tc_status="expunge"
-			    continue
+				tc_status="expunge"
+			else
+				echo
+				start=0
+				stop=0
+				tc_status="list"
 			fi
-			echo
-			start=0
-			stop=0
-			tc_status="list"
-			notrun+=("$seqnum")
+			_stash_test_status "$seqnum" "$tc_status"
 			continue
 		fi
 
 		tc_status="pass"
 		if [ ! -f $seq ]; then
 			echo " - no such test?"
+			_stash_test_status "$seqnum" "$tc_status"
 			continue
 		fi
 
@@ -808,6 +824,7 @@ function run_section()
 		_expunge_test $seqnum
 		if [ $? -eq 1 ]; then
 			tc_status="expunge"
+			_stash_test_status "$seqnum" "$tc_status"
 			continue
 		fi
 
@@ -857,8 +874,8 @@ function run_section()
 			$timestamp && echo " [not run]" && \
 				      echo -n "	$seqnum -- "
 			cat $seqres.notrun
-			notrun+=("$seqnum")
 			tc_status="notrun"
+			_stash_test_status "$seqnum" "$tc_status"
 
 			# Unmount the scratch fs so that we can wipe the scratch
 			# dev state prior to the next test run.
@@ -903,6 +920,7 @@ function run_section()
 		if [ ! -f $seq.out ]; then
 			_dump_err "no qualified output"
 			tc_status="fail"
+			_stash_test_status "$seqnum" "$tc_status"
 			continue;
 		fi
 
@@ -938,17 +956,9 @@ function run_section()
 				rm -f $seqres.hints
 			fi
 		fi
+		_stash_test_status "$seqnum" "$tc_status"
 	done
 
-	# make sure we record the status of the last test we ran.
-	if [ "$tc_status" == "fail" ]; then
-		bad+=("$seqnum")
-	fi
-	if $do_report && [[ ! $tc_status =~ ^(init|expunge)$ ]]; then
-		_make_testcase_report "$section" "$seqnum" "$tc_status" \
-				      "$((stop - start))"
-	fi
-
 	sect_stop=`_wallclock`
 	interrupt=false
 	_wrapup
-- 
2.35.3

[PATCH v4 5/5] check: add -L <n> parameter to rerun failed tests

[David Disseldorp]

If check is run with -L <n>, then a failed test will be rerun <n> times
before proceeding to the next test. Following completion of the rerun
loop, aggregate pass/fail statistics are printed.

Rerun tests will be tracked as a single failure in overall pass/fail
metrics (via @try and @bad), with .out.bad, .dmesg, .core, .hints,
.notrun and .full saved using a .rerun# suffix.

Suggested-by: Theodore Ts'o <tytso@mit.edu>
Link: https://lwn.net/Articles/897061/
Signed-off-by: David Disseldorp <ddiss@suse.de>
---
 check | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 54 insertions(+), 3 deletions(-)

diff --git a/check b/check
index 6dbdb2a8..5f6d86b4 100755
--- a/check
+++ b/check
@@ -26,6 +26,7 @@ do_report=false
 DUMP_OUTPUT=false
 iterations=1
 istop=false
+loop_on_fail=0
 
 # This is a global variable used to pass test failure text to reporting gunk
 _err_msg=""
@@ -78,6 +79,7 @@ check options
     --large-fs		optimise scratch device for large filesystems
     -s section		run only specified section from config file
     -S section		exclude the specified section from the config file
+    -L <n>		loop tests <n> times following a failure, measuring aggregate pass/fail metrics
 
 testlist options
     -g group[,group...]	include tests from these groups
@@ -336,6 +338,9 @@ while [ $# -gt 0 ]; do
 		;;
 	--large-fs) export LARGE_SCRATCH_DEV=yes ;;
 	--extra-space=*) export SCRATCH_DEV_EMPTY_SPACE=${r#*=} ;;
+	-L)	[[ $2 =~ ^[0-9]+$ ]] || usage
+		loop_on_fail=$2; shift
+		;;
 
 	-*)	usage ;;
 	*)	# not an argument, we've got tests now.
@@ -553,6 +558,19 @@ _expunge_test()
 	return 0
 }
 
+# retain files which would be overwritten in subsequent reruns of the same test
+_stash_fail_loop_files() {
+	local seq_prefix="${REPORT_DIR}/${1}"
+	local cp_suffix="$2"
+
+	for i in ".full" ".dmesg" ".out.bad" ".notrun" ".core" ".hints"; do
+		rm -f "${seq_prefix}${i}${cp_suffix}"
+		if [ -f "${seq_prefix}${i}" ]; then
+			cp "${seq_prefix}${i}" "${seq_prefix}${i}${cp_suffix}"
+		fi
+	done
+}
+
 # Retain in @bad / @notrun the result of the just-run @test_seq. @try array
 # entries are added prior to execution.
 _stash_test_status() {
@@ -564,8 +582,35 @@ _stash_test_status() {
 				      "$test_status" "$((stop - start))"
 	fi
 
+	if ((${#loop_status[*]} > 0)); then
+		# continuing or completing rerun-on-failure loop
+		_stash_fail_loop_files "$test_seq" ".rerun${#loop_status[*]}"
+		loop_status+=("$test_status")
+		if ((${#loop_status[*]} > loop_on_fail)); then
+			printf "%s aggregate results across %d runs: " \
+				"$test_seq" "${#loop_status[*]}"
+			awk "BEGIN {
+				n=split(\"${loop_status[*]}\", arr);"'
+				for (i = 1; i <= n; i++)
+					stats[arr[i]]++;
+				for (x in stats)
+					printf("%s=%d (%.1f%%)",
+					       (i-- > n ? x : ", " x),
+					       stats[x], 100 * stats[x] / n);
+				}'
+			echo
+			loop_status=()
+		fi
+		return	# only stash @bad result for initial failure in loop
+	fi
+
 	case "$test_status" in
 	fail)
+		if ((loop_on_fail > 0)); then
+			# initial failure, start rerun-on-failure loop
+			_stash_fail_loop_files "$test_seq" ".rerun0"
+			loop_status+=("$test_status")
+		fi
 		bad+=("$test_seq")
 		;;
 	list|notrun)
@@ -758,8 +803,12 @@ function run_section()
 	seqres="$check"
 	_check_test_fs
 
-	local tc_status
-	for seq in $list ; do
+	loop_status=()	# track rerun-on-failure state
+	local tc_status ix
+	local -a _list=( $list )
+	for ((ix = 0; ix < ${#_list[*]}; !${#loop_status[*]} && ix++)); do
+		seq="${_list[$ix]}"
+
 		if [ ! -f $seq ]; then
 			# Try to get full name in case the user supplied only
 			# seq id and the test has a name. A bit of hassle to
@@ -829,7 +878,9 @@ function run_section()
 		fi
 
 		# record that we really tried to run this test.
-		try+=("$seqnum")
+		if ((!${#loop_status[*]})); then
+			try+=("$seqnum")
+		fi
 
 		awk 'BEGIN {lasttime="       "} \
 		     $1 == "'$seqnum'" {lasttime=" " $2 "s ... "; exit} \
-- 
2.35.3

Re: [PATCH v4 5/5] check: add -L <n> parameter to rerun failed tests

[Darrick J. Wong]

On Fri, Jul 08, 2022 at 10:51:42AM +0200, David Disseldorp wrote:
> If check is run with -L <n>, then a failed test will be rerun <n> times
> before proceeding to the next test. Following completion of the rerun
> loop, aggregate pass/fail statistics are printed.
> 
> Rerun tests will be tracked as a single failure in overall pass/fail
> metrics (via @try and @bad), with .out.bad, .dmesg, .core, .hints,
> .notrun and .full saved using a .rerun# suffix.
> 
> Suggested-by: Theodore Ts'o <tytso@mit.edu>
> Link: https://lwn.net/Articles/897061/
> Signed-off-by: David Disseldorp <ddiss@suse.de>

Looks good!
Reviewed-by: Darrick J. Wong <djwong@kernel.org>

--D

> ---
>  check | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++++++---
>  1 file changed, 54 insertions(+), 3 deletions(-)
> 
> diff --git a/check b/check
> index 6dbdb2a8..5f6d86b4 100755
> --- a/check
> +++ b/check
> @@ -26,6 +26,7 @@ do_report=false
>  DUMP_OUTPUT=false
>  iterations=1
>  istop=false
> +loop_on_fail=0
>  
>  # This is a global variable used to pass test failure text to reporting gunk
>  _err_msg=""
> @@ -78,6 +79,7 @@ check options
>      --large-fs		optimise scratch device for large filesystems
>      -s section		run only specified section from config file
>      -S section		exclude the specified section from the config file
> +    -L <n>		loop tests <n> times following a failure, measuring aggregate pass/fail metrics
>  
>  testlist options
>      -g group[,group...]	include tests from these groups
> @@ -336,6 +338,9 @@ while [ $# -gt 0 ]; do
>  		;;
>  	--large-fs) export LARGE_SCRATCH_DEV=yes ;;
>  	--extra-space=*) export SCRATCH_DEV_EMPTY_SPACE=${r#*=} ;;
> +	-L)	[[ $2 =~ ^[0-9]+$ ]] || usage
> +		loop_on_fail=$2; shift
> +		;;
>  
>  	-*)	usage ;;
>  	*)	# not an argument, we've got tests now.
> @@ -553,6 +558,19 @@ _expunge_test()
>  	return 0
>  }
>  
> +# retain files which would be overwritten in subsequent reruns of the same test
> +_stash_fail_loop_files() {
> +	local seq_prefix="${REPORT_DIR}/${1}"
> +	local cp_suffix="$2"
> +
> +	for i in ".full" ".dmesg" ".out.bad" ".notrun" ".core" ".hints"; do
> +		rm -f "${seq_prefix}${i}${cp_suffix}"
> +		if [ -f "${seq_prefix}${i}" ]; then
> +			cp "${seq_prefix}${i}" "${seq_prefix}${i}${cp_suffix}"
> +		fi
> +	done
> +}
> +
>  # Retain in @bad / @notrun the result of the just-run @test_seq. @try array
>  # entries are added prior to execution.
>  _stash_test_status() {
> @@ -564,8 +582,35 @@ _stash_test_status() {
>  				      "$test_status" "$((stop - start))"
>  	fi
>  
> +	if ((${#loop_status[*]} > 0)); then
> +		# continuing or completing rerun-on-failure loop
> +		_stash_fail_loop_files "$test_seq" ".rerun${#loop_status[*]}"
> +		loop_status+=("$test_status")
> +		if ((${#loop_status[*]} > loop_on_fail)); then
> +			printf "%s aggregate results across %d runs: " \
> +				"$test_seq" "${#loop_status[*]}"
> +			awk "BEGIN {
> +				n=split(\"${loop_status[*]}\", arr);"'
> +				for (i = 1; i <= n; i++)
> +					stats[arr[i]]++;
> +				for (x in stats)
> +					printf("%s=%d (%.1f%%)",
> +					       (i-- > n ? x : ", " x),
> +					       stats[x], 100 * stats[x] / n);
> +				}'
> +			echo
> +			loop_status=()
> +		fi
> +		return	# only stash @bad result for initial failure in loop
> +	fi
> +
>  	case "$test_status" in
>  	fail)
> +		if ((loop_on_fail > 0)); then
> +			# initial failure, start rerun-on-failure loop
> +			_stash_fail_loop_files "$test_seq" ".rerun0"
> +			loop_status+=("$test_status")
> +		fi
>  		bad+=("$test_seq")
>  		;;
>  	list|notrun)
> @@ -758,8 +803,12 @@ function run_section()
>  	seqres="$check"
>  	_check_test_fs
>  
> -	local tc_status
> -	for seq in $list ; do
> +	loop_status=()	# track rerun-on-failure state
> +	local tc_status ix
> +	local -a _list=( $list )
> +	for ((ix = 0; ix < ${#_list[*]}; !${#loop_status[*]} && ix++)); do
> +		seq="${_list[$ix]}"
> +
>  		if [ ! -f $seq ]; then
>  			# Try to get full name in case the user supplied only
>  			# seq id and the test has a name. A bit of hassle to
> @@ -829,7 +878,9 @@ function run_section()
>  		fi
>  
>  		# record that we really tried to run this test.
> -		try+=("$seqnum")
> +		if ((!${#loop_status[*]})); then
> +			try+=("$seqnum")
> +		fi
>  
>  		awk 'BEGIN {lasttime="       "} \
>  		     $1 == "'$seqnum'" {lasttime=" " $2 "s ... "; exit} \
> -- 
> 2.35.3
> 

Re: [PATCH v4 0/5] check: add option to rerun failed tests

[Zorro Lang]

On Fri, Jul 08, 2022 at 10:51:37AM +0200, David Disseldorp wrote:
> This patchset adds support to loop on failed tests, as proposed by
> Ted Ts'o in https://lwn.net/Articles/897061/:
>   add a mode that will immediately rerun a failed test 25 or 100 times
>   to establish a failure percentage.

This patchset is good to me. if no more objections, I think it's time
to merge this feature. I'll give it a testing, then try to push it
this weekend.

Reviewed-by: Zorro Lang <zlang@redhat.com>

Thanks,
Zorro

> 
> Changes since (v3), following Darrick's review:
> - extended full/out.bad/etc. retention to cover more paths and remove
>   stale .rerun# files
> 
> Changes since (v2), following Darrick's review:
> - dropped RFC flag
> - rebased atop v2022.07.03
> - simplified test iterator
>   + results stashed at the end of each iteration, rather than start of
>     next / loop-exit
> - dropped aggregate loop stats message from xunit report
> - squashed full/dmesg/out.bad file retention patch with rerun patch
> 
> Changes since (v1):
> - rebased atop upstream v2022.06.26
> - added a few extra cleanup commits
> - append details for every rerun to xunit output
>   + provide aggregate stats via <testcase status=X>
> - extend _stash_test_status to call report hook, as well as save failure
>   artifacts with a .rerun# suffix
> 
> Diffstat:
>  check         | 137 +++++++++++++++++++++++++++++++++++++-------------
>  common/report |  90 ++++++++++++++++-----------------
>  2 files changed, 144 insertions(+), 83 deletions(-)
> 
>