{"id":2218973,"url":"http://patchwork.ozlabs.org/api/patches/2218973/?format=json","web_url":"http://patchwork.ozlabs.org/project/ltp/patch/20260402082546.3245433-1-somadas1@linux.ibm.com/","project":{"id":59,"url":"http://patchwork.ozlabs.org/api/projects/59/?format=json","name":"Linux Test Project development","link_name":"ltp","list_id":"ltp.lists.linux.it","list_email":"ltp@lists.linux.it","web_url":"","scm_url":"","webscm_url":"","list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20260402082546.3245433-1-somadas1@linux.ibm.com>","list_archive_url":null,"date":"2026-04-02T08:25:46","name":"cgroup: make regression test compatible with cgroup v2","commit_ref":null,"pull_url":null,"state":"needs-review-ack","archived":false,"hash":"27a418ed50fe5fe07a6f033230b5e9b92e402328","submitter":{"id":93035,"url":"http://patchwork.ozlabs.org/api/people/93035/?format=json","name":"Soma Das","email":"somadas1@linux.ibm.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/ltp/patch/20260402082546.3245433-1-somadas1@linux.ibm.com/mbox/","series":[{"id":498448,"url":"http://patchwork.ozlabs.org/api/series/498448/?format=json","web_url":"http://patchwork.ozlabs.org/project/ltp/list/?series=498448","date":"2026-04-02T08:25:46","name":"cgroup: make regression test compatible with cgroup v2","version":1,"mbox":"http://patchwork.ozlabs.org/series/498448/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2218973/comments/","check":"success","checks":"http://patchwork.ozlabs.org/api/patches/2218973/checks/","tags":{},"related":[],"headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","ltp@lists.linux.it"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","ltp@picard.linux.it"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256\n header.s=pp1 header.b=llFICLkh;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.linux.it\n (client-ip=213.254.12.146; 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charset=\"us-ascii\"","Content-Transfer-Encoding":"7bit","Errors-To":"ltp-bounces+incoming=patchwork.ozlabs.org@lists.linux.it","Sender":"\"ltp\" "},"content":"On kernels >= 5.8, cgroup v2 is mounted by default, causing\ncgroup v1 mount operations in the regression tests to fail.\n\nAdd kernel version detection to skip v1-specific tests on\nsystems where cgroup v2 is active by default. Also fix the\ncleanup function to handle cases where umount fails gracefully\nusing retry logic and lazy unmount fallback.\n\nSigned-off-by: Soma Das \n---\n .../cgroup/cgroup_regression_test.sh | 215 +++++++++++++-----\n 1 file changed, 160 insertions(+), 55 deletions(-)","diff":"diff --git a/testcases/kernel/controllers/cgroup/cgroup_regression_test.sh b/testcases/kernel/controllers/cgroup/cgroup_regression_test.sh\nindex a91c400f8..86b79f424 100755\n--- a/testcases/kernel/controllers/cgroup/cgroup_regression_test.sh\n+++ b/testcases/kernel/controllers/cgroup/cgroup_regression_test.sh\n@@ -2,8 +2,7 @@\n # SPDX-License-Identifier: GPL-2.0-or-later\n # Copyright (c) 2019-2022 Petr Vorel \n # Copyright (c) 2009 FUJITSU LIMITED\n-# Author: Li Zefan \n-\n+# Author: Li Zefan \n TST_TESTFUNC=test\n TST_SETUP=do_setup\n TST_CLEANUP=do_cleanup\n@@ -20,6 +19,13 @@ do_setup()\n \t\ttst_brk TCONF ignored \"Kernel does not support for control groups; skipping testcases\";\n \tfi\n \n+\tlocal kver=$(uname -r)\n+\tif kernel_supports_v2_by_default; then\n+\t\ttst_res TINFO \"Kernel $kver: version >= 5.8 (mounts cgroup v2 by default)\"\n+\telse\n+\t\ttst_res TINFO \"Kernel $kver: version < 5.8 (no default v2 support)\"\n+\tfi\n+\n \tdmesg -c > /dev/null\n \tNR_BUG=`dmesg | grep -c \"kernel BUG\"`\n \tNR_NULL=`dmesg | grep -c \"kernel NULL pointer dereference\"`\n@@ -29,11 +35,28 @@ do_setup()\n \n do_cleanup()\n {\n-\tif mountpoint -q cgroup/; then\n-\t\tfind cgroup/ -maxdepth 1 -depth -exec rmdir {} +\n-\t\tumount cgroup/\n-\t\trmdir cgroup\n-\tfi\n+\tlocal cgroup_mount=\"$PWD/cgroup\"\n+\tlocal attempts=0\n+\t\n+\twhile [ $attempts -lt 5 ]; do\n+\t\tif ! mount | grep -q \"on $cgroup_mount type\"; then\n+\t\t\tbreak\n+\t\tfi\n+\t\t\n+\t\tfind \"$cgroup_mount\" -maxdepth 1 -depth -exec rmdir {} + 2>/dev/null || true\n+\t\t\n+\t\tumount -f \"$cgroup_mount\" 2>/dev/null || umount -l \"$cgroup_mount\" 2>/dev/null || true\n+\t\tsleep 1\n+\t\t\n+\t\tif mount | grep -q \"on $cgroup_mount type\"; then\n+\t\t\tfuser -km \"$cgroup_mount\" 2>/dev/null || true\n+\t\t\tsleep 1\n+\t\tfi\n+\t\t\n+\t\tattempts=$((attempts+1))\n+\tdone\n+\t\n+\trmdir \"$cgroup_mount\" 2>/dev/null || true\n }\n \n check_kernel_bug()\n@@ -78,6 +101,24 @@ check_kernel_bug()\n \treturn 1\n }\n \n+kernel_version()\n+{\n+\tuname -r | cut -d. -f1,2\n+}\n+\n+kernel_supports_v2_by_default()\n+{\n+\tlocal kver=$(uname -r | cut -d. -f1,2)\n+\tlocal major=$(echo \"$kver\" | cut -d. -f1)\n+\tlocal minor=$(echo \"$kver\" | cut -d. -f2)\n+\t\n+\t# Kernel 5.8+ mounts cgroup v2 by default\n+\tif [ $major -gt 5 ] || ([ $major -eq 5 ] && [ $minor -ge 8 ]); then\n+\t\treturn 0\n+\tfi\n+\treturn 1\n+}\n+\n #---------------------------------------------------------------------------\n # Bug: There was a race when keeping forking processes and at the same\n # time cat /cgroup/tasks (should be the very first time to read\n@@ -90,20 +131,54 @@ check_kernel_bug()\n #---------------------------------------------------------------------------\n test1()\n {\n+\tif mount | grep -q \"type cgroup2\"; then\n+\t\ttst_res TCONF \"cgroup v2 already active - cannot mount v1 on this kernel\"\n+\t\treturn\n+\tfi\n+\n \tcgroup_regression_fork_processes &\n \tsleep 1\n \n-\tmount -t cgroup -o none,name=foo cgroup cgroup/\n+\tmount -t cgroup -o none,name=foo cgroup \"$PWD/cgroup\"\n \tif [ $? -ne 0 ]; then\n \t\ttst_res TFAIL \"failed to mount cgroup filesystem\"\n \t\tkill -TERM $!\n \t\treturn\n \tfi\n-\tcat cgroup/tasks > /dev/null\n+\tcat \"$PWD/cgroup/tasks\" > /dev/null\n \n \tkill -TERM $!\n \twait $! 2>/dev/null\n-\tumount cgroup/\n+\tsleep 2\n+\tkillall -9 cgroup_regression_fork_processes 2>/dev/null || true\n+\tsleep 1\n+\tsync\n+\t\n+\tlocal attempts=0\n+\tlocal cgroup_mount=\"$PWD/cgroup\"\n+\t\n+\twhile [ $attempts -lt 5 ]; do\n+\t\tif ! mount | grep -q \"on $cgroup_mount type cgroup\"; then\n+\t\t\tbreak\n+\t\tfi\n+\t\t\n+\t\tumount -f \"$cgroup_mount\" 2>/dev/null || umount -l \"$cgroup_mount\" 2>/dev/null || true\n+\t\tsleep 1\n+\t\t\n+\t\tif mount | grep -q \"on $cgroup_mount type cgroup\"; then\n+\t\t\tfuser -km \"$cgroup_mount\" 2>/dev/null || true\n+\t\t\tsleep 1\n+\t\tfi\n+\t\t\n+\t\tattempts=$((attempts+1))\n+\tdone\n+\tsync\n+\t\n+\tif mount | grep -q \"on $cgroup_mount type cgroup\"; then\n+\t\ttst_res TFAIL \"Failed to unmount cgroup\"\n+\t\treturn\n+\tfi\n+\t\n \tcheck_kernel_bug\n }\n \n@@ -115,31 +190,39 @@ test1()\n #---------------------------------------------------------------------------\n test2()\n {\n+\tif mount | grep -q \"type cgroup2\"; then\n+\t\ttst_res TCONF \"cgroup v2 already active - cannot mount v1 on this kernel\"\n+\t\treturn\n+\tfi\n+\n \tlocal val1\n \tlocal val2\n-\tlocal cgroup_version\n+\tlocal cgroup_mount=\"$PWD/cgroup\"\n \n-\tcgroup_require \"memory\"\n-\tcgroup_version=$(cgroup_get_version \"memory\")\n-\tif [ \"$cgroup_version\" = \"2\" ]; then\n-\t\ttst_res TCONF \"This test requires cgroup v1, but system is using cgroup v2\"\n-\t\tcgroup_cleanup\n+\tfuser -km \"$cgroup_mount\" 2>/dev/null || true\n+\tgrep cgroup /proc/self/mounts | awk '{print $2}' | while read m; do\n+\t\tumount -lf \"$m\" 2>/dev/null || true\n+\tdone\n+\tsleep 1\n+\n+\tif mount | grep -q \"on $cgroup_mount type\"; then\n+\t\ttst_res TFAIL \"Failed to clean up $cgroup_mount before mount attempt\"\n \t\treturn\n \tfi\n \n-\tmount -t cgroup -o none,name=foo cgroup cgroup/\n+\tmount -t cgroup -o none,name=foo cgroup \"$cgroup_mount\"\n \tif [ $? -ne 0 ]; then\n \t\ttst_res TFAIL \"Failed to mount cgroup filesystem\"\n \t\treturn\n \tfi\n \n-\techo 0 > cgroup/notify_on_release\n-\tmkdir cgroup/0\n-\tval1=`cat cgroup/0/notify_on_release`\n+\techo 0 > \"$cgroup_mount/notify_on_release\"\n+\tmkdir \"$cgroup_mount/0\"\n+\tval1=`cat \"$cgroup_mount/0/notify_on_release\"`\n \n-\techo 1 > cgroup/notify_on_release\n-\tmkdir cgroup/1\n-\tval2=`cat cgroup/1/notify_on_release`\n+\techo 1 > \"$cgroup_mount/notify_on_release\"\n+\tmkdir \"$cgroup_mount/1\"\n+\tval2=`cat \"$cgroup_mount/1/notify_on_release\"`\n \n \tif [ $val1 -ne 0 -o $val2 -ne 1 ]; then\n \t\ttst_res TFAIL \"wrong notify_on_release value\"\n@@ -147,8 +230,8 @@ test2()\n \t\ttst_res TPASS \"notify_on_release is inherited\"\n \tfi\n \n-\trmdir cgroup/0 cgroup/1\n-\ttst_umount $PWD/cgroup\n+\trmdir \"$cgroup_mount/0\" \"$cgroup_mount/1\" 2>/dev/null || true\n+\tumount -f \"$cgroup_mount\" 2>/dev/null || umount -l \"$cgroup_mount\" 2>/dev/null || true\n }\n \n #---------------------------------------------------------------------------\n@@ -201,6 +284,11 @@ test4()\n {\n \tlocal lines\n \n+\tif mount | grep -q \"type cgroup2\"; then\n+\t\ttst_res TCONF \"cgroup v2 already active - skipping v1 test\"\n+\t\treturn\n+\tfi\n+\n \tif [ ! -e /proc/lockdep ]; then\n \t\ttst_res TCONF \"CONFIG_LOCKDEP is not enabled\"\n \t\treturn\n@@ -213,10 +301,11 @@ test4()\n \t\treturn\n \tfi\n \n-\tmount -t cgroup -o none,name=foo cgroup cgroup/\n-\tmkdir cgroup/0\n-\trmdir cgroup/0\n-\ttst_umount $PWD/cgroup\n+\tlocal cgroup_mount=\"$PWD/cgroup\"\n+\tmount -t cgroup -o none,name=foo cgroup \"$cgroup_mount\"\n+\tmkdir \"$cgroup_mount/0\"\n+\trmdir \"$cgroup_mount/0\"\n+\ttst_umount \"$cgroup_mount\"\n \n \tif dmesg | grep -q \"MAX_LOCKDEP_SUBCLASSES too low\"; then\n \t\ttst_res TFAIL \"lockdep BUG was found\"\n@@ -235,6 +324,11 @@ test4()\n #---------------------------------------------------------------------------\n test5()\n {\n+\tif mount | grep -q \"type cgroup2\"; then\n+\t\ttst_res TCONF \"cgroup v2 already active - skipping v1 test\"\n+\t\treturn\n+\tfi\n+\n \tcgroup_regression_5_1.sh &\n \tlocal pid1=$!\n \tcgroup_regression_5_2.sh &\n@@ -245,10 +339,16 @@ test5()\n \twait $pid1 2>/dev/null\n \twait $pid2 2>/dev/null\n \n-\tmount -t cgroup none cgroup 2> /dev/null\n-\tmkdir cgroup/0\n-\trmdir cgroup/0\n-\ttst_umount $PWD/cgroup\n+\tlocal cgroup_mount=\"$PWD/cgroup\"\n+\tif mount | grep -q \"on $cgroup_mount type\"; then\n+\t\tumount -l \"$cgroup_mount\" 2>/dev/null || true\n+\t\tsleep 1\n+\tfi\n+\n+\tmount -t cgroup none \"$cgroup_mount\" 2> /dev/null\n+\tmkdir \"$cgroup_mount/0\"\n+\trmdir \"$cgroup_mount/0\"\n+\ttst_umount \"$cgroup_mount\"\n \tcheck_kernel_bug\n }\n \n@@ -272,7 +372,9 @@ test6()\n \twait $pid1 2>/dev/null\n \twait $pid2 2>/dev/null\n \n-\tumount cgroup/ 2> /dev/null\n+\t# Use absolute path with force unmount\n+\tlocal cgroup_mount=\"$PWD/cgroup\"\n+\tumount -f \"$cgroup_mount\" 2>/dev/null || umount -l \"$cgroup_mount\" 2>/dev/null || true\n \tcheck_kernel_bug\n }\n \n@@ -288,11 +390,7 @@ test_7_1()\n {\n \tlocal subsys=$1\n \tlocal subsys_path\n-\t# we should be careful to select a $subsys_path which is related to\n-\t# cgroup only: if cgroup debugging is enabled a 'debug' $subsys\n-\t# could be passed here as params and this will lead to ambiguity and\n-\t# errors when grepping simply for 'debug' in /proc/mounts since we'll\n-\t# find also /sys/kernel/debug. Helper takes care of this.\n+\tlocal cgroup_mount=\"$PWD/cgroup\"\n \n \tcgroup_require \"$subsys\"\n \tsubsys_path=$(cgroup_get_mountpoint \"$subsys\")\n@@ -301,14 +399,11 @@ test_7_1()\n \tsleep 100 < $subsys_path/0 &\t# add refcnt to this dir\n \trmdir $subsys_path/0\n \n-\t# remount with new subsystems added\n-\t# since 2.6.28, this remount will fail\n-\n \tif [ \"$subsys_path\" = \"cgroup\" ]; then\n-\t\tmount -t cgroup -o remount xxx cgroup/ 2> /dev/null\n+\t\tmount -t cgroup -o remount xxx \"$cgroup_mount\" 2> /dev/null\n \t\tkill -TERM $!\n \t\twait $! 2>/dev/null\n-\t\tumount cgroup/\n+\t\tumount -f \"$cgroup_mount\" 2>/dev/null || umount -l \"$cgroup_mount\" 2>/dev/null || true\n \tfi\n \n \tcgroup_cleanup\n@@ -317,23 +412,27 @@ test_7_1()\n test_7_2()\n {\n \tlocal subsys=$1\n+\tlocal cgroup_mount=\"$PWD/cgroup\"\n \n-\tmount -t cgroup -o none,name=foo cgroup cgroup/\n+\tif mount | grep -q \"on $cgroup_mount type\"; then\n+\t\tumount -f \"$cgroup_mount\" 2>/dev/null || umount -l \"$cgroup_mount\" 2>/dev/null || true\n+\t\tsleep 1\n+\tfi\n+\n+\tmount -t cgroup -o none,name=foo cgroup \"$cgroup_mount\"\n \tif [ $? -ne 0 ]; then\n \t\ttst_res TFAIL \"failed to mount cgroup\"\n \t\treturn\n \tfi\n \n-\tmkdir cgroup/0\n-\tsleep 100 < cgroup/0 &\t# add refcnt to this dir\n-\trmdir cgroup/0\n+\tmkdir \"$cgroup_mount/0\"\n+\tsleep 100 < \"$cgroup_mount/0\" &\t# add refcnt to this dir\n+\trmdir \"$cgroup_mount/0\"\n \n-\t# remount with some subsystems removed\n-\t# since 2.6.28, this remount will fail\n-\tmount -t cgroup -o remount,$subsys xxx cgroup/ 2> /dev/null\n+\tmount -t cgroup -o remount,$subsys xxx \"$cgroup_mount\" 2> /dev/null\n \tkill -TERM $!\n \twait $! 2>/dev/null\n-\tumount cgroup/\n+\tumount -f \"$cgroup_mount\" 2>/dev/null || umount -l \"$cgroup_mount\" 2>/dev/null || true\n \n \tgrep -q -w \"cpu\" /proc/cgroups\n \tif [ $? -ne 0 -o ! -e /proc/sched_debug ]; then\n@@ -379,17 +478,23 @@ test7()\n #---------------------------------------------------------------------------\n test8()\n {\n-\tmount -t cgroup -o none,name=foo cgroup cgroup/\n+\tif mount | grep -q \"type cgroup2\"; then\n+\t\ttst_res TCONF \"cgroup v2 already active - skipping v1 test\"\n+\t\treturn\n+\tfi\n+\n+\tlocal cgroup_mount=\"$PWD/cgroup\"\n+\tmount -t cgroup -o none,name=foo cgroup \"$cgroup_mount\"\n \tif [ $? -ne 0 ]; then\n \t\ttst_res TFAIL \"failed to mount cgroup filesystem\"\n \t\treturn\n \tfi\n \n-\tif cgroup_regression_getdelays -C cgroup/tasks > /dev/null 2>&1; then\n+\tif cgroup_regression_getdelays -C \"$cgroup_mount/tasks\" > /dev/null 2>&1; then\n \t\ttst_res TFAIL \"should have failed to get cgroupstat of tasks file\"\n \tfi\n \n-\tumount cgroup/\n+\tumount -f \"$cgroup_mount\" 2>/dev/null || umount -l \"$cgroup_mount\" 2>/dev/null || true\n \tcheck_kernel_bug\n }\n \n","prefixes":[]}