[Bug 1902358] ProcEnviron.txt

[Proton]

apport information

** Attachment added: "ProcEnviron.txt"
   https://bugs.launchpad.net/bugs/1902358/+attachment/5429766/+files/ProcEnviron.txt

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https://bugs.launchpad.net/bugs/1902358

Title:
  Kubernetes service connectivity issue Ubuntu 20.04 + fq queue
  discipline

Status in systemd package in Ubuntu:
  Incomplete

Bug description:
  IMO this is not related to Kubernetes so I filed the bug here.

  **What happened**:
  Processes in container can't connect to `kubernetes.default` service.

  **What you expected to happen**:
  It should be able to connect.

  **How to reproduce it (as minimally and precisely as possible)**:
  ```bash
  host# tc qdisc add dev eth0 root fq
  host# nsenter -n -t $(pidof some-process-in-container)
  container-net-ns# nc -vv 10.97.0.1 443  # Could not connect
  ```

  **Anything else we need to know?**:
  ```bash
  host# tc qdisc add dev eth0 root noqueue  # this works
  host# tc qdisc add dev eth0 root fq_codel  # this works too
  ```
  - `host` is where the workload container is, not Kubernetes master.
  - When the bug condition is met, packets won't be sent on wire.
  - kube-proxy works in IPVS mode.
  - The reason to tinker with qdisc is to enable TCP BBR, which requires fq qdisc.
  - fq qdisc works in `Linux node1 4.15.0-106-generic #107-Ubuntu SMP Thu Jun 4 11:27:52 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux (Ubuntu 18.04)`

  **Environment**:
  - Cloud provider or hardware configuration: `NIC: Intel X520-DA1 (82599)`
  - OS (e.g: `cat /etc/os-release`): `Ubuntu 20.04.1 LTS \n \l`
  - Kernel (e.g. `uname -a`): `Linux Proton 5.4.0-52-generic #57-Ubuntu SMP Thu Oct 15 10:57:00 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux`
  - Install tools:
  - Network plugin and version (if this is a network-related bug): `Calico v3.14.1 with IPIP & NAT-Outgoing`
  - Others:
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.11-0ubuntu27.10
  Architecture: amd64
  CasperMD5CheckResult: pass
  DistroRelease: Ubuntu 20.04
  InstallationDate: Installed on 2020-10-31 (0 days ago)
  InstallationMedia: Ubuntu-Server 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  MachineType: Dell Inc. PowerEdge R730
  NonfreeKernelModules: nvidia_modeset nvidia
  Package: systemd 245.4-4ubuntu3.2
  PackageArchitecture: amd64
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-52-generic root=UUID=14d488b4-d8f0-4b48-8793-780af41edd93 ro
  ProcVersionSignature: Ubuntu 5.4.0-52.57-generic 5.4.65
  Tags:  focal uec-images
  Uname: Linux 5.4.0-52-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: N/A
  _MarkForUpload: True
  dmi.bios.date: 01/17/2017
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 2.4.3
  dmi.board.name: 0WCJNT
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A07
  dmi.chassis.type: 23
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvr2.4.3:bd01/17/2017:svnDellInc.:pnPowerEdgeR730:pvr:rvnDellInc.:rn0WCJNT:rvrA07:cvnDellInc.:ct23:cvr:
  dmi.product.name: PowerEdge R730
  dmi.product.sku: SKU=NotProvided;ModelName=PowerEdge R730
  dmi.sys.vendor: Dell Inc.

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