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zdtm: use unique holder for cgroups

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The idea that each zdtm.py should have own helder, so that two zdtm.py that are
running on the same host don't effect each other.

Fixes: #1774
Signed-off-by: Andrei Vagin <avagin@google.com>
This commit is contained in:
Andrei Vagin 2022-03-20 22:11:19 -07:00 committed by Andrei Vagin
parent 73a783ac17
commit ab6191ccd3
3 changed files with 11 additions and 5 deletions
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6
test/zdtm.py
View File

@ -27,6 +27,7 @@ import subprocess
import sys
import tempfile
import time
import uuid
from builtins import input, int, open, range, str, zip
import yaml
@ -38,6 +39,7 @@ from zdtm.criu_config import criu_config
STREAMED_IMG_FILE_NAME = "img.criu"
prev_line = None
uuid = uuid.uuid4()
def alarm(*args):
@ -617,12 +619,12 @@ class zdtm_test:
if not os.access("zdtm/lib/libzdtmtst.a", os.F_OK):
subprocess.check_call(["make", "-C", "zdtm/"])
subprocess.check_call(
["flock", "zdtm_mount_cgroups.lock", "./zdtm_mount_cgroups"])
["flock", "zdtm_mount_cgroups.lock", "./zdtm_mount_cgroups", str(uuid)])
@staticmethod
def cleanup():
subprocess.check_call(
["flock", "zdtm_mount_cgroups.lock", "./zdtm_umount_cgroups"])
["flock", "zdtm_mount_cgroups.lock", "./zdtm_umount_cgroups", str(uuid)])
def load_module_from_file(name, path):

4
test/zdtm_mount_cgroups
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@ -4,13 +4,15 @@
# Error (cgroup.c:768): cg: Set 3 is not subset of 2
# so lets create all test controllers before executing tests.
uuid=$1
cat /proc/self/cgroup | grep -q zdtmtst.defaultroot && exit
tdir=`mktemp -d zdtm.XXXXXX`
for i in "zdtmtst" "zdtmtst.defaultroot"; do
mount -t cgroup -o none,name=$i zdtm $tdir &&
# a fake group prevents destroying of a controller
mkdir -p $tdir/holder &&
mkdir -p $tdir/holder.$uuid &&
umount -l $tdir || exit 1
done
rmdir $tdir

6
test/zdtm_umount_cgroups
View File

@ -4,12 +4,14 @@
cat /proc/self/cgroup | grep -q zdtmtst.defaultroot || exit 0
uuid=$1
tdir=`mktemp -d zdtm.XXXXXX`
for i in "zdtmtst" "zdtmtst.defaultroot"; do
mount -t cgroup -o none,name=$i zdtm $tdir || { rmdir $tdir; exit 1; }
# remove a fake group if exists
if [ -d "$tdir/holder" ]; then
rmdir $tdir/holder || { umount -l $tdir && rmdir $tdir; exit 1; }
if [ -d "$tdir/holder.$uuid" ]; then
rmdir $tdir/holder.$uuid || { umount -l $tdir && rmdir $tdir; exit 1; }
fi
umount -l $tdir || exit 1;
done