Issue found with bionic/linux-hwe-5.4 5.4.0-79.88~18.04.1.

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https://bugs.launchpad.net/bugs/1892213

Title:
  psock_snd.sh in net from ubuntu_kernel_selftests ADT failure with
  focal/groovy/hirsute/impish

Status in ubuntu-kernel-tests:
  New
Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Focal:
  Confirmed
Status in linux source package in Groovy:
  Confirmed
Status in linux source package in Hirsute:
  Confirmed

Bug description:
  Testing failed on focal/linux 5.4.0-44.48:
      amd64: 
https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-focal/focal/amd64/l/linux/20200812_171444_31971@/log.gz
      arm64: 
https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-focal/focal/arm64/l/linux/20200812_210509_145fd@/log.gz
      ppc64el: 
https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-focal/focal/ppc64el/l/linux/20200812_165855_1dabd@/log.gz
      s390x: 
https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-focal/focal/s390x/l/linux/20200812_153600_9c7cb@/log.gz

  psock_snd.sh output:

  16:28:30 DEBUG| [stdout] # selftests: net: psock_snd.sh
  16:28:31 DEBUG| [stdout] # dgram
  16:28:31 DEBUG| [stdout] # tx: 128
  16:28:31 DEBUG| [stdout] # rx: 142
  16:28:31 DEBUG| [stdout] # rx: 100
  16:28:31 DEBUG| [stdout] # OK
  16:28:31 DEBUG| [stdout] # 
  16:28:31 DEBUG| [stdout] # dgram bind
  16:28:31 DEBUG| [stdout] # tx: 128
  16:28:31 DEBUG| [stdout] # rx: 142
  16:28:31 DEBUG| [stdout] # rx: 100
  16:28:31 DEBUG| [stdout] # OK
  16:28:31 DEBUG| [stdout] # 
  16:28:31 DEBUG| [stdout] # raw
  16:28:31 DEBUG| [stdout] # tx: 142
  16:28:31 DEBUG| [stdout] # rx: 142
  16:28:31 DEBUG| [stdout] # rx: 100
  16:28:31 DEBUG| [stdout] # OK
  16:28:31 DEBUG| [stdout] # 
  16:28:31 DEBUG| [stdout] # raw bind
  16:28:31 DEBUG| [stdout] # tx: 142
  16:28:31 DEBUG| [stdout] # rx: 142
  16:28:31 DEBUG| [stdout] # rx: 100
  16:28:31 DEBUG| [stdout] # OK
  16:28:31 DEBUG| [stdout] # 
  16:28:31 DEBUG| [stdout] # raw qdisc bypass
  16:28:31 DEBUG| [stdout] # tx: 142
  16:28:31 DEBUG| [stdout] # rx: 142
  16:28:31 DEBUG| [stdout] # rx: 100
  16:28:31 DEBUG| [stdout] # OK
  16:28:31 DEBUG| [stdout] # 
  16:28:31 DEBUG| [stdout] # raw vlan
  16:28:31 DEBUG| [stdout] # tx: 146
  16:28:31 DEBUG| [stdout] # rx: 100
  16:28:31 DEBUG| [stdout] # OK
  16:28:31 DEBUG| [stdout] # 
  16:28:31 DEBUG| [stdout] # raw vnet hdr
  16:28:31 DEBUG| [stdout] # tx: 152
  16:28:31 DEBUG| [stdout] # rx: 142
  16:28:31 DEBUG| [stdout] # rx: 100
  16:28:31 DEBUG| [stdout] # OK
  16:28:31 DEBUG| [stdout] # 
  16:28:31 DEBUG| [stdout] # raw csum_off
  16:28:31 DEBUG| [stdout] # tx: 152
  16:28:31 DEBUG| [stdout] # rx: 142
  16:28:31 DEBUG| [stdout] # rx: 100
  16:28:31 DEBUG| [stdout] # OK
  16:28:31 DEBUG| [stdout] # 
  16:28:31 DEBUG| [stdout] # raw csum_off with bad offset (fails)
  16:28:31 DEBUG| [stdout] # ./psock_snd: write: Invalid argument
  16:28:31 DEBUG| [stdout] # raw min size
  16:28:31 DEBUG| [stdout] # tx: 42
  16:28:31 DEBUG| [stdout] # rx: 0
  16:28:31 DEBUG| [stdout] # OK
  16:28:31 DEBUG| [stdout] # 
  16:28:31 DEBUG| [stdout] # raw mtu size
  16:28:31 DEBUG| [stdout] # tx: 1514
  16:28:31 DEBUG| [stdout] # rx: 1472
  16:28:31 DEBUG| [stdout] # OK
  16:28:31 DEBUG| [stdout] # 
  16:28:31 DEBUG| [stdout] # raw mtu size + 1 (fails)
  16:28:31 DEBUG| [stdout] # ./psock_snd: write: Message too long
  16:28:31 DEBUG| [stdout] # raw vlan mtu size + 1 (fails)
  16:28:31 DEBUG| [stdout] # ./psock_snd: write: Message too long
  16:28:32 DEBUG| [stdout] # dgram mtu size
  16:28:32 DEBUG| [stdout] # tx: 1500
  16:28:32 DEBUG| [stdout] # rx: 1472
  16:28:32 DEBUG| [stdout] # OK
  16:28:32 DEBUG| [stdout] # 
  16:28:32 DEBUG| [stdout] # dgram mtu size + 1 (fails)
  16:28:32 DEBUG| [stdout] # ./psock_snd: write: Message too long
  16:28:32 DEBUG| [stdout] # raw truncate hlen (fails: does not arrive)
  16:28:32 DEBUG| [stdout] # tx: 14
  16:28:32 DEBUG| [stdout] # ./psock_snd: recv: Resource temporarily unavailable
  16:28:32 DEBUG| [stdout] # raw truncate hlen - 1 (fails: EINVAL)
  16:28:32 DEBUG| [stdout] # ./psock_snd: write: Invalid argument
  16:28:32 DEBUG| [stdout] # raw gso min size
  16:28:32 DEBUG| [stdout] # tx: 1525
  16:28:32 DEBUG| [stdout] # rx: 1473
  16:28:32 DEBUG| [stdout] # OK
  16:28:32 DEBUG| [stdout] # 
  16:28:32 DEBUG| [stdout] # raw gso min size - 1 (fails)
  16:28:32 DEBUG| [stdout] # tx: 1524
  16:28:32 DEBUG| [stdout] # rx: 1472
  16:28:32 DEBUG| [stdout] # OK
  16:28:32 DEBUG| [stdout] # 
  16:28:32 DEBUG| [stdout] not ok 22 selftests: net: psock_snd.sh # exit=1

  This failure is similar to bug 1884234, however, this test didn't fail
  on ADT with focal/linux before 5.4.0-44.48.

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