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  1. OpenShift Bugs
  2. OCPBUGS-17958

Tracking issue for RHBZ#2233214 [4.13.z]

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    • 4.13.z
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      Description of problem:

      https://access.redhat.com/solutions/7014337 was reported for RHEL8, but it can happen even in RHEL9.
      
        Bug 2208905 - Regression of 3b8cc6298724 ("blk-cgroup: Optimize blkcg_rstat_flush()") 
        https://bugzilla.redhat.com/show_bug.cgi?id=2208905
      
      This issue can happen also on OCP 4.13.z.
      

      Version-Release number of selected component (if applicable):

      4.13.6

      How reproducible:

      Just create and delete pods repeateadly for a while, then check /proc/cgroups.
      You will see that blkio's num_cgroups has increased.
      

      Steps to Reproduce:

      1.
      2.
      3.
      

      Actual results:

      You will see that blkio's num_cgroups has increased as follows:
      
      ```
      [core@worker2 ~]$ cat /proc/cgroups
      #subsys_name    hierarchy       num_cgroups     enabled
      cpuset  13      70      1
      cpu     12      119     1
      cpuacct 12      119     1
      blkio   2       4689    1
      memory  3       265     1
      devices 4       101     1
      freezer 9       70      1
      net_cls 5       70      1
      perf_event      8       70      1
      net_prio        5       70      1
      hugetlb 11      70      1
      pids    7       120     1
      rdma    6       70      1
      misc    10      70      1
      ```
      

      Expected results:

      It's not increased.

      Additional info:

       

              mnguyen@redhat.com Michael Nguyen
              rhn-support-hfukumot Hideshi Fukumoto
              None
              None
              Huijing Hei Huijing Hei
              None
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              1 Vote for this issue
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                Created:
                Updated: