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[Bug 2122683] Re: plucky:ubuntu_kselftests_net:cmsg_ipv6.sh failure

To: canonical-ubuntu-qa@xxxxxxxxxxxxxxxxxxx
From: Mehmet Basaran <2122683@xxxxxxxxxxxxxxxxxx>
Date: Fri, 12 Sep 2025 14:25:42 -0000
Reply-to: Bug 2122683 <2122683@xxxxxxxxxxxxxxxxxx>
Sender: noreply@xxxxxxxxxxxxx
I have tested the kernel with the following commit + the commit in the
description reverted and test passed.

Author: Willem de Bruijn <willemb@xxxxxxxxxx>
Date:   Thu Mar 6 22:34:08 2025 -0500

    ipv6: remove leftover ip6 cookie initializer
    
    BugLink: https://bugs.launchpad.net/bugs/2115678
    
    [ Upstream commit 54580ccdd8a9c6821fd6f72171d435480867e4c3 ]
    
    As of the blamed commit ipc6.dontfrag is always initialized at the
    start of udpv6_sendmsg, by ipcm6_init_sk, to either 0 or 1.
    
    Later checks against -1 are no longer needed and the branches are now
    dead code.
    
    The blamed commit had removed those branches. But I had overlooked
    this one case.
    
    UDP has both a lockless fast path and a slower path for corked
    requests. This branch remained in the fast path.


** Also affects: ubuntu-kernel-tests
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/2122683

Title:
  plucky:ubuntu_kselftests_net:cmsg_ipv6.sh failure

Status in ubuntu-kernel-tests:
  New
Status in linux package in Ubuntu:
  New
Status in linux source package in Plucky:
  New

Bug description:
  plucky:linux 6.14.0-32.32, 2025.08.11 cycle, because of the following
  commit from the upstream net:cmsg_ipv6.sh fails. Mostlike we need the
  tests to be updated.

  Author: Willem de Bruijn <willemb@xxxxxxxxxx>
  Date:   Thu Mar 6 22:34:09 2025 -0500

      ipv6: save dontfrag in cork

      BugLink: https://bugs.launchpad.net/bugs/2115678

      [ Upstream commit a18dfa9925b9ef6107ea3aa5814ca3c704d34a8a ]

      When spanning datagram construction over multiple send calls using
      MSG_MORE, per datagram settings are configured on the first send.

      That is when ip(6)_setup_cork stores these settings for subsequent use
      in __ip(6)_append_data and others.

      The only flag that escaped this was dontfrag. As a result, a datagram
      could be constructed with df=0 on the first sendmsg, but df=1 on a
      next. Which is what cmsg_ip.sh does in an upcoming MSG_MORE test in
      the "diff" scenario.

      Changing datagram conditions in the middle of constructing an skb
      makes this already complex code path even more convoluted. It is here
      unintentional. Bring this flag in line with expected sockopt/cmsg
      behavior.

      And stop passing ipc6 to __ip6_append_data, to avoid such issues
      in the future. This is already the case for __ip_append_data.

      inet6_cork had a 6 byte hole, so the 1B flag has no impact.

  Test Log:

  03:05:23 INFO | START ubuntu_kselftests_net.net:cmsg_ipv6.sh ubuntu_kselftests_net.net:cmsg_ipv6.sh timeout=2700 timestamp=1756523123 localtime=Aug 30 03:05:23
  03:05:23 DEBUG| Persistent state client._record_indent now set to 2
  03:05:23 DEBUG| Persistent state client.unexpected_reboot now set to ('ubuntu_kselftests_net.net:cmsg_ipv6.sh', 'ubuntu_kselftests_net.net:cmsg_ipv6.sh')
  03:05:23 DEBUG| Waiting for pid 395345 for 2700 seconds
  03:05:23 WARNI| System python is too old, crash handling disabled
  03:05:23 DEBUG| Running 'make run_tests -C net TEST_PROGS=cmsg_ipv6.sh TEST_GEN_PROGS='' TEST_CUSTOM_PROGS='''
  03:05:23 DEBUG| [stdout] make: Entering directory '/home/ubuntu/autotest/client/tmp/ubuntu_kselftests_net/src/linux/tools/testing/selftests/net'
  03:05:23 DEBUG| [stdout] TAP version 13
  03:05:23 DEBUG| [stdout] 1..1
  03:05:23 DEBUG| [stdout] # timeout set to 0
  03:05:23 DEBUG| [stdout] # selftests: net: cmsg_ipv6.sh
  03:05:23 DEBUG| [stdout] # ERROR: ld.so: object '/usr/libexec/coreutils/libstdbuf.so' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.
  03:05:23 DEBUG| [stdout] # Case DONTFRAG UDP setsock returned 1, expected 0
  03:05:25 DEBUG| [stdout] # FAIL - 1/93 cases failed
  03:05:25 DEBUG| [stdout] not ok 1 selftests: net: cmsg_ipv6.sh # exit=1
  03:05:25 DEBUG| [stdout] make: Leaving directory '/home/ubuntu/autotest/client/tmp/ubuntu_kselftests_net/src/linux/tools/testing/selftests/net'
  03:05:25 ERROR| Exception escaping from test:
  Traceback (most recent call last):
  File "/home/ubuntu/autotest/client/shared/test.py", line 411, in _exec
  _call_test_function(self.execute, *p_args, **p_dargs)
  ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/autotest/client/shared/test.py", line 823, in _call_test_function
  return func(*args, **dargs)
  File "/home/ubuntu/autotest/client/shared/test.py", line 290, in execute
  self._call_run_once(constraints, profile_only,
  ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
  postprocess_profiled_run, args, dargs)
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/autotest/client/shared/test.py", line 212, in _call_run_once
  self.run_once(*args, **dargs)
  ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^
  File "/home/ubuntu/autotest/client/tests/ubuntu_kselftests_net/ubuntu_kselftests_net.py", line 176, in run_once
  raise error.TestError(test_name + ' failed.')
  autotest.client.shared.error.TestError: net:cmsg_ipv6.sh failed.
  03:05:25 ERROR| child process failed
  03:05:25 DEBUG| Traceback (most recent call last):
  03:05:25 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 411, in _exec
  03:05:25 DEBUG| _call_test_function(self.execute, *p_args, **p_dargs)
  03:05:25 DEBUG| ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  03:05:25 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 823, in _call_test_function
  03:05:25 DEBUG| return func(*args, **dargs)
  03:05:25 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 290, in execute
  03:05:25 DEBUG| self._call_run_once(constraints, profile_only,
  03:05:25 DEBUG| ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
  03:05:25 DEBUG| postprocess_profiled_run, args, dargs)
  03:05:25 DEBUG| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  03:05:25 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 212, in _call_run_once
  03:05:25 DEBUG| self.run_once(*args, **dargs)
  03:05:25 DEBUG| ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^
  03:05:25 DEBUG| File "/home/ubuntu/autotest/client/tests/ubuntu_kselftests_net/ubuntu_kselftests_net.py", line 176, in run_once
  03:05:25 DEBUG| raise error.TestError(test_name + ' failed.')
  03:05:25 DEBUG| autotest.client.shared.error.TestError: net:cmsg_ipv6.sh failed.
  03:05:25 DEBUG|
  03:05:25 DEBUG| During handling of the above exception, another exception occurred:
  03:05:25 DEBUG|
  03:05:25 DEBUG| Traceback (most recent call last):
  03:05:25 DEBUG| File "/home/ubuntu/autotest/client/parallel.py", line 25, in fork_start
  03:05:25 DEBUG| l()
  03:05:25 DEBUG| ~^^
  03:05:25 DEBUG| File "/home/ubuntu/autotest/client/job.py", line 506, in
  03:05:25 DEBUG| l = lambda: test.runtest(self, url, tag, args, dargs)
  03:05:25 DEBUG| ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  03:05:25 DEBUG| File "/home/ubuntu/autotest/client/test.py", line 121, in runtest
  03:05:25 DEBUG| common_test.runtest(job, url, tag, args, dargs, locals(), globals(),
  03:05:25 DEBUG| ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  03:05:25 DEBUG| job.sysinfo.log_before_each_test,
  03:05:25 DEBUG| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  03:05:25 DEBUG| job.sysinfo.log_after_each_test,
  03:05:25 DEBUG| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  03:05:25 DEBUG| job.sysinfo.log_before_each_iteration,
  03:05:25 DEBUG| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  03:05:25 DEBUG| job.sysinfo.log_after_each_iteration)
  03:05:25 DEBUG| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  03:05:25 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 913, in runtest
  03:05:25 DEBUG| mytest._exec(args, dargs)
  03:05:25 DEBUG| ~~~~~~~~~~~~^^^^^^^^^^^^^
  03:05:25 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 434, in _exec
  03:05:25 DEBUG| raise exc_info[0](exc_info[1]).with_traceback(exc_info[2])
  03:05:25 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 411, in _exec
  03:05:25 DEBUG| _call_test_function(self.execute, *p_args, **p_dargs)
  03:05:25 DEBUG| ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  03:05:25 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 823, in _call_test_function
  03:05:25 DEBUG| return func(*args, **dargs)
  03:05:25 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 290, in execute
  03:05:25 DEBUG| self._call_run_once(constraints, profile_only,
  03:05:25 DEBUG| ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
  03:05:25 DEBUG| postprocess_profiled_run, args, dargs)
  03:05:25 DEBUG| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  03:05:25 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 212, in _call_run_once
  03:05:25 DEBUG| self.run_once(*args, **dargs)
  03:05:25 DEBUG| ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^
  03:05:25 DEBUG| File "/home/ubuntu/autotest/client/tests/ubuntu_kselftests_net/ubuntu_kselftests_net.py", line 176, in run_once
  03:05:25 DEBUG| raise error.TestError(test_name + ' failed.')
  03:05:25 DEBUG| autotest.client.shared.error.TestError: net:cmsg_ipv6.sh failed.
  03:05:27 INFO | ERROR ubuntu_kselftests_net.net:cmsg_ipv6.sh ubuntu_kselftests_net.net:cmsg_ipv6.sh timestamp=1756523127 localtime=Aug 30 03:05:27 net:cmsg_ipv6.sh failed.
  03:05:27 INFO | END ERROR ubuntu_kselftests_net.net:cmsg_ipv6.sh ubuntu_kselftests_net.net:cmsg_ipv6.sh timestamp=1756523127 localtime=Aug 30 03:05:27
  03:05:27 DEBUG| Persistent state client._record_indent now set to 1
  03:05:27 DEBUG| Persistent state client.unexpected_reboot deleted
  03:05:27 DEBUG| Test has timeout: 2700 sec.

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