View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0000592 | AlmaLinux-9 | -OTHER | public | 2025-12-11 06:07 | 2025-12-11 06:07 |
| Reporter | harish | Assigned To | |||
| Priority | immediate | Severity | major | Reproducibility | always |
| Status | new | Resolution | open | ||
| Summary | 0000592: LTP memcontrol03 fails with “TBROK: tst_checkpoint_wait() ETIMEDOUT (110)” on AlmaLinux 9 / cgroup v2 — Is this expected behavio | ||||
| Description | Hello Community, I am running LTP (Linux Test Project) on AlmaLinux 9.6 running on Azure (kernel using cgroup v2 unified hierarchy). One of the tests, controllers/memcontrol03, consistently results in: TBROK: tst_checkpoint_wait(1, 10000) failed: ETIMEDOUT (110) What I have verified so far The system correctly exposes cgroup v2 memory controller files: memory.current memory.max memory.events memory.stat memory.reclaim memory.swap.* The test appears to wait for a memory event notification that never occurs. According to the documentation, memcontrol03 relies on cgroup v1-style memory events, which are not generated under cgroup v2. My understanding From reading kernel documentation and test code: cgroup v2 no longer provides legacy memory event notifications expected by memcontrol03 → https://www.kernel.org/doc/html/latest/admin-guide/cgroup-v2.html#memory-controller memcontrol03 waits inside tst_checkpoint_wait() for an event that v2 systems do not emit → leading to the timeout and TBROK. Questions for the community Is this TBROK result expected for all cgroup v2 systems? Is memcontrol03 officially considered incompatible with cgroup v2? Should this test be skipped/marked as BROKEN on any distro using cgroup v2 (RHEL9/AL9/Fedora)? Is there any known workaround, or is the correct approach to exclude the test? Additional context Same behavior across multiple AlmaLinux 9 VMs on Azure. No OS/kernel defects observed; other memory controller tests run normally. Logs show that the event never occurs within the 10-second window. I would appreciate clarification or official guidance from LTP maintainers or anyone familiar with memory controller tests on cgroup v2. Thank you! | ||||
| Tags | No tags attached. | ||||
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2025-12-11 06:07 | harish | New Issue |
