Hi Roman, Just want to share information here on what we notice on running this test case, On Fri, 5 Apr 2019 at 23:17, Roman Gushchin <guroan@xxxxxxxxx> wrote: > > This patch implements 9 tests for the freezer controller for > cgroup v2: ... > 6) ptrace test: the test checks that it's possible to attach to > a process in a frozen cgroup, get some information and detach, and > the cgroup will remain frozen. selftests cgroup test_freezer failed because of the sys entry path not found. Cgroup /sys/fs/cgroup/unified/cg_test_ptrace isn't frozen /sys/fs/cgroup/unified/cg_test_ptrace: isn't_frozen # # not ok 6 test_cgfreezer_ptrace This test case fails intermittently. Test output: ------------- # selftests cgroup test_freezer cgroup: test_freezer_ # # Cgroup /sys/fs/cgroup/unified/cg_test_ptrace isn't frozen /sys/fs/cgroup/unified/cg_test_ptrace: isn't_frozen # # ok 1 test_cgfreezer_simple 1: test_cgfreezer_simple_ # # ok 2 test_cgfreezer_tree 2: test_cgfreezer_tree_ # # ok 3 test_cgfreezer_forkbomb 3: test_cgfreezer_forkbomb_ # # ok 4 test_cgfreezer_rmdir 4: test_cgfreezer_rmdir_ # # ok 5 test_cgfreezer_migrate 5: test_cgfreezer_migrate_ # # not ok 6 test_cgfreezer_ptrace ok: 6_test_cgfreezer_ptrace # # ok 7 test_cgfreezer_stopped 7: test_cgfreezer_stopped_ # # ok 8 test_cgfreezer_ptraced 8: test_cgfreezer_ptraced_ # # ok 9 test_cgfreezer_vfork 9: test_cgfreezer_vfork_ # [FAIL] 3 selftests cgroup test_freezer selftests: cgroup_test_freezer [FAIL] Test results link, https://qa-reports.linaro.org/lkft/linux-mainline-oe/tests/kselftest/cgroup_test_freezer?page=1 - Naresh
