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[Bug 1892213] Re: psock_snd.sh in net from ubuntu_kernel_selftests ADT failure with focal/groovy/hirsute/impish

To: canonical-ubuntu-qa@xxxxxxxxxxxxxxxxxxx
From: Jürg Häfliger <1892213@xxxxxxxxxxxxxxxxxx>
Date: Sat, 19 Apr 2025 14:57:18 -0000
Reply-to: Bug 1892213 <1892213@xxxxxxxxxxxxxxxxxx>
Sender: noreply@xxxxxxxxxxxxx
** Tags added: kernel-daily-bug

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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:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in linux-oem-5.10 package in Ubuntu:
  Invalid
Status in linux-oem-5.13 package in Ubuntu:
  Invalid
Status in linux-oem-5.14 package in Ubuntu:
  Invalid
Status in linux source package in Focal:
  Fix Released
Status in linux-oem-5.10 source package in Focal:
  Fix Released
Status in linux-oem-5.13 source package in Focal:
  Fix Released
Status in linux-oem-5.14 source package in Focal:
  Fix Released
Status in linux source package in Groovy:
  Won't Fix
Status in linux source package in Hirsute:
  Fix Released
Status in linux-oem-5.10 source package in Hirsute:
  Invalid
Status in linux-oem-5.13 source package in Hirsute:
  Invalid
Status in linux-oem-5.14 source package in Hirsute:
  Invalid

Bug description:
  [Impact]
  The expected to fail 'raw gso min size - 1' test in psock_snd.sh is
  not failing as expected, and thus this test will fail with:

    raw gso min size - 1 (expected to fail)
    tx: 1524
    rx: 1472
    OK

  This is because after commit 7c6d2ec ("net: be more gentle about silly
  gso requests coming from user"), we relaxed the min gso_size check in
  virtio_net_hdr_to_skb().

  So when a packet which is smaller then the gso_size, GSO for this
  packet will not be set, the packet will be send/recv successfully.

  [Fix]
  * cfba3fb68960b4 selftests/net: remove min gso test in packet_snd

  This patch can be cherry-picked into all affected kernels.

  I decided to skip those 5.8 variants, as the current cycle
  (2021-09-06) might be the last cycle for them.

  [Test]
  Run this psock_snd.sh script, this test will no longer exist and the
  script can proceed with the next test.

  [Where problems could occur]
  Removing this broken test should not have any negative impact to our
  tests. We will need to update our hints later.

  
  [Original Bug Report]
  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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