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Could > somebody do a TL;DR summary of the failure, since when it happens, is it > really v1 specific? The test ltp_memcg_stat_rss is indeed cgroup v1 specific. The test started failing soon after this commit 7d7ef0a4686ab mm: memcg: restore subtree stats flushing This commit was part of a 5 patch series: 508bed884767a mm: memcg: change flush_next_time to flush_last_time e0bf1dc859fdd mm: memcg: move vmstats structs definition above flushing code 8d59d2214c236 mm: memcg: make stats flushing threshold per-memcg b006847222623 mm: workingset: move the stats flush into workingset_test_recent() 7d7ef0a4686ab mm: memcg: restore subtree stats flushing The test log returns this: <<>> tag=memcg_stat_rss stime=1731755339 cmdline="memcg_stat_rss.sh" contacts="" analysis=exit <<>> incrementing stop memcg_stat_rss 1 TINFO: Running: memcg_stat_rss.sh memcg_stat_rss 1 TINFO: Tested kernel: Linux harjha-ol9kdevltp 6.7.0-masterpost.2024111.el9.rc1.x86_64 #1 SMP PREEMPT_DYNAMIC Fri Nov 15 11:55:41 PST 2024 x86_64 x86_64 x86_64 GNU/Linux memcg_stat_rss 1 TINFO: Using /tempdir/ltp-G6cge4CkrR/LTP_memcg_stat_rss.1zrm6X02CO as tmpdir (xfs filesystem) memcg_stat_rss 1 TINFO: timeout per run is 0h 5m 0s memcg_stat_rss 1 TINFO: set /sys/fs/cgroup/memory/memory.use_hierarchy to 0 failed memcg_stat_rss 1 TINFO: Setting shmmax memcg_stat_rss 1 TINFO: Running memcg_process --mmap-anon -s 266240 memcg_stat_rss 1 TINFO: Warming up pid: 9083 memcg_stat_rss 1 TINFO: Process is still here after warm up: 9083 memcg_stat_rss 1 TFAIL: rss is 0, 266240 expected memcg_stat_rss 1 TBROK: timed out on memory.usage_in_bytes 4096 266240 266240 /opt/ltp-20240930/testcases/bin/tst_test.sh: line 158:  9083 Killed                  memcg_process "$@"  (wd: /sys/fs/cgroup/memory/ltp/test-9024/ltp_9024) Summary: passed   0 failed   1 broken   1 skipped  0 warnings 0 <<>> It is important to note that the entire test suite didn't even execute as the second test itself was broken. The latest 6.12 also shows errors in this test suite upon explicitly enabling cgroups v1. 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memcg_stat_rss while running mainline kernels between 6.7 and 6.8 X-BeenThere: ltp@lists.linux.it X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux Test Project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Harshvardhan Jha via ltp Reply-To: Harshvardhan Jha Cc: cgroups@vger.kernel.org, ltp@lists.linux.it Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: ltp-bounces+ltp=archiver.kernel.org@lists.linux.it Sender: "ltp" SGVsbG8gTWljaGFsCk9uIDE2LzAxLzI1IDE6MjMgUE0sIE1pY2hhbCBIb2NrbyB3cm90ZToKPiBI aSwKPgo+IE9uIFdlZCAxNS0wMS0yNSAyMzo1OToyMCwgUGV0ciBWb3JlbCB3cm90ZToKPj4gSGkg SGFyc2h2YXJkaGFuLAo+Pgo+PiBbIENjIGNncm91cHNAdmdlci5rZXJuZWwub3JnOiBGWUkgcHJv YmxlbSBpbiByZWNlbnQga2VybmVsIHVzaW5nIGNncm91cCB2MSBdCj4gSXQgaXMgaGFyZCB0byBk ZWN5cGhlciB0aGUgb3V0cHV0IGFuZCBuYWlsIGRvd24gYWN0dWFsIGZhaWx1cmUuIENvdWxkCj4g c29tZWJvZHkgZG8gYSBUTDtEUiBzdW1tYXJ5IG9mIHRoZSBmYWlsdXJlLCBzaW5jZSB3aGVuIGl0 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