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List: linux-cgroups
Subject: [PATCH v3 bpf-next 07/11] selftests/bpf: Fix issues in setup_classid_environment()
From: Yafang Shao <laoar.shao () gmail ! com>
Date: 2023-10-29 6:14:34
Message-ID: 20231029061438.4215-8-laoar.shao () gmail ! com
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If the net_cls subsystem is already mounted, attempting to mount it again
in setup_classid_environment() will result in a failure with the error code
EBUSY. Despite this, tmpfs will have been successfully mounted at
/sys/fs/cgroup/net_cls. Consequently, the /sys/fs/cgroup/net_cls directory
will be empty, causing subsequent setup operations to fail.
Here's an error log excerpt illustrating the issue when net_cls has already
been mounted at /sys/fs/cgroup/net_cls prior to running
setup_classid_environment():
- Before that change
$ tools/testing/selftests/bpf/test_progs --name=cgroup_v1v2
test_cgroup_v1v2:PASS:server_fd 0 nsec
test_cgroup_v1v2:PASS:client_fd 0 nsec
test_cgroup_v1v2:PASS:cgroup_fd 0 nsec
test_cgroup_v1v2:PASS:server_fd 0 nsec
run_test:PASS:skel_open 0 nsec
run_test:PASS:prog_attach 0 nsec
test_cgroup_v1v2:PASS:cgroup-v2-only 0 nsec
(cgroup_helpers.c:248: errno: No such file or directory) Opening Cgroup Procs: \
/sys/fs/cgroup/net_cls/cgroup.procs (cgroup_helpers.c:540: errno: No such file or \
directory) Opening cgroup classid: \
/sys/fs/cgroup/net_cls/cgroup-test-work-dir/net_cls.classid run_test:PASS:skel_open \
0 nsec run_test:PASS:prog_attach 0 nsec
(cgroup_helpers.c:248: errno: No such file or directory) Opening Cgroup Procs: \
/sys/fs/cgroup/net_cls/cgroup-test-work-dir/cgroup.procs run_test:FAIL:join_classid \
unexpected error: 1 (errno 2) test_cgroup_v1v2:FAIL:cgroup-v1v2 unexpected error: -1 \
(errno 2) (cgroup_helpers.c:248: errno: No such file or directory) Opening Cgroup \
Procs: /sys/fs/cgroup/net_cls/cgroup.procs #44 cgroup_v1v2:FAIL
Summary: 0/0 PASSED, 0 SKIPPED, 1 FAILED
- After that change
$ tools/testing/selftests/bpf/test_progs --name=cgroup_v1v2
#44 cgroup_v1v2:OK
Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED
Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
---
tools/testing/selftests/bpf/cgroup_helpers.c | 18 ++++++++++++++----
1 file changed, 14 insertions(+), 4 deletions(-)
diff --git a/tools/testing/selftests/bpf/cgroup_helpers.c \
b/tools/testing/selftests/bpf/cgroup_helpers.c index 5b1da2a..10b5f42 100644
--- a/tools/testing/selftests/bpf/cgroup_helpers.c
+++ b/tools/testing/selftests/bpf/cgroup_helpers.c
@@ -523,10 +523,20 @@ int setup_classid_environment(void)
return 1;
}
- if (mount("net_cls", NETCLS_MOUNT_PATH, "cgroup", 0, "net_cls") &&
- errno != EBUSY) {
- log_err("mount cgroup net_cls");
- return 1;
+ if (mount("net_cls", NETCLS_MOUNT_PATH, "cgroup", 0, "net_cls")) {
+ if (errno != EBUSY) {
+ log_err("mount cgroup net_cls");
+ return 1;
+ }
+
+ if (rmdir(NETCLS_MOUNT_PATH)) {
+ log_err("rmdir cgroup net_cls");
+ return 1;
+ }
+ if (umount(CGROUP_MOUNT_DFLT)) {
+ log_err("umount cgroup base");
+ return 1;
+ }
}
cleanup_classid_environment();
--
1.8.3.1
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