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[Bug 2122688] Re: plucky:ubuntu_kselftests_net:ptmu.sh IPv4/IPv6 PTMU exceptions on s390x.lpar

To: canonical-ubuntu-qa@xxxxxxxxxxxxxxxxxxx
From: Ubuntu Kernel Bot <2122688@xxxxxxxxxxxxxxxxxx>
Date: Fri, 12 Sep 2025 23:00:25 -0000
Reply-to: Bug 2122688 <2122688@xxxxxxxxxxxxxxxxxx>
Sender: noreply@xxxxxxxxxxxxx
** Tags added: kernel-daily-bug

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https://bugs.launchpad.net/bugs/2122688

Title:
  plucky:ubuntu_kselftests_net:ptmu.sh IPv4/IPv6 PTMU exceptions on
  s390x.lpar

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

Bug description:
  This test case never passed on this z15kernel0b (s390x.lpar) since the
  instance is added to the pool (starting with plucky:linux 6.14.0-27)

  
  16925  03:10:10 INFO | GOOD ubuntu_kselftests_net.net:fib-onlink-tests.sh ubuntu_kselftests_net.net:fib-onlink-tests.sh timestamp=1753240210 localtime=Jul 23 03:10:10 completed successfully
  16926  03:10:10 INFO | END GOOD ubuntu_kselftests_net.net:fib-onlink-tests.sh ubuntu_kselftests_net.net:fib-onlink-tests.sh timestamp=1753240210 localtime=Jul 23 03:10:10
  16927  03:10:10 DEBUG| Persistent state client._record_indent now set to 1
  16928  03:10:10 DEBUG| Persistent state client.unexpected_reboot deleted
  16929  03:10:10 DEBUG| Test has timeout: 2700 sec.
  16930  03:10:10 INFO | START ubuntu_kselftests_net.net:pmtu.sh ubuntu_kselftests_net.net:pmtu.sh timeout=2700 timestamp=1753240210 localtime=Jul 23 03:10:10
  16931  03:10:10 DEBUG| Persistent state client._record_indent now set to 2
  16932  03:10:10 DEBUG| Persistent state client.unexpected_reboot now set to ('ubuntu_kselftests_net.net:pmtu.sh', 'ubuntu_kselftests_net.net:pmtu.sh')
  16933  03:10:10 DEBUG| Waiting for pid 91947 for 2700 seconds
  16934  03:10:10 WARNI| System python is too old, crash handling disabled
  16935  03:10:10 DEBUG| Running 'make run_tests -C net TEST_PROGS=pmtu.sh TEST_GEN_PROGS='' TEST_CUSTOM_PROGS='''
  16936  03:10:10 DEBUG| [stdout] make: Entering directory '/home/ubuntu/autotest/client/tmp/ubuntu_kselftests_net/src/linux/tools/testing/selftests/net'
  16937  03:10:10 DEBUG| [stdout] TAP version 13
  16938  03:10:10 DEBUG| [stdout] 1..1
  16939  03:10:10 DEBUG| [stdout] # timeout set to 0
  16940  03:10:10 DEBUG| [stdout] # selftests: net: pmtu.sh
  16941  03:10:10 DEBUG| [stdout] # TEST: ipv4: PMTU exceptions [ OK ]
  16942  03:10:11 DEBUG| [stdout] # TEST: ipv4: PMTU exceptions - nexthop objects [ OK ]
  16943  03:10:11 DEBUG| [stdout] # TEST: ipv6: PMTU exceptions [ OK ]
  16944  03:10:11 DEBUG| [stdout] # TEST: ipv6: PMTU exceptions - nexthop objects [ OK ]
  16945  03:10:12 DEBUG| [stdout] # TEST: ICMPv4 with DSCP and ECN: PMTU exceptions [ OK ]
  16946  03:10:12 DEBUG| [stdout] # TEST: ICMPv4 with DSCP and ECN: PMTU exceptions - nexthop objects [ OK ]
  16947  03:10:12 DEBUG| [stdout] # TEST: UDPv4 with DSCP and ECN: PMTU exceptions [ OK ]
  16948  03:10:12 DEBUG| [stdout] # 2025/07/23 03:10:12 socat[93025] W exiting on signal 15
  16949  03:10:13 DEBUG| [stdout] # TEST: UDPv4 with DSCP and ECN: PMTU exceptions - nexthop objects [ OK ]
  16950  03:10:13 DEBUG| [stdout] # 2025/07/23 03:10:13 socat[93178] W exiting on signal 15
  16951  03:10:14 DEBUG| [stdout] # TEST: IPv4 over vxlan4: PMTU exceptions [ OK ]
  16952  03:10:15 DEBUG| [stdout] # TEST: IPv4 over vxlan4: PMTU exceptions - nexthop objects [ OK ]
  16953  03:10:17 DEBUG| [stdout] # TEST: IPv6 over vxlan4: PMTU exceptions [ OK ]
  16954  03:10:18 DEBUG| [stdout] # TEST: IPv6 over vxlan4: PMTU exceptions - nexthop objects [ OK ]
  16955  03:10:19 DEBUG| [stdout] # TEST: IPv4 over vxlan6: PMTU exceptions [ OK ]
  16956  03:10:21 DEBUG| [stdout] # TEST: IPv4 over vxlan6: PMTU exceptions - nexthop objects [ OK ]
  16957  03:10:22 DEBUG| [stdout] # TEST: IPv6 over vxlan6: PMTU exceptions [ OK ]
  16958  03:10:24 DEBUG| [stdout] # TEST: IPv6 over vxlan6: PMTU exceptions - nexthop objects [ OK ]
  16959  03:10:25 DEBUG| [stdout] # TEST: IPv4 over geneve4: PMTU exceptions [ OK ]
  16960  03:10:26 DEBUG| [stdout] # TEST: IPv4 over geneve4: PMTU exceptions - nexthop objects [ OK ]
  16961  03:10:28 DEBUG| [stdout] # TEST: IPv6 over geneve4: PMTU exceptions [ OK ]
  16962  03:10:29 DEBUG| [stdout] # TEST: IPv6 over geneve4: PMTU exceptions - nexthop objects [ OK ]
  16963  03:10:30 DEBUG| [stdout] # TEST: IPv4 over geneve6: PMTU exceptions [ OK ]
  16964  03:10:32 DEBUG| [stdout] # TEST: IPv4 over geneve6: PMTU exceptions - nexthop objects [ OK ]
  16965  03:10:33 DEBUG| [stdout] # TEST: IPv6 over geneve6: PMTU exceptions [ OK ]
  16966  03:10:34 DEBUG| [stdout] # TEST: IPv6 over geneve6: PMTU exceptions - nexthop objects [ OK ]
  16967  03:10:36 DEBUG| [stdout] # TEST: IPv4, bridged vxlan4: PMTU exceptions [FAIL]
  16968  03:10:38 DEBUG| [stdout] # TEST: IPv4, bridged vxlan4: PMTU exceptions - nexthop objects [FAIL]
  16969  03:10:40 DEBUG| [stdout] # TEST: IPv6, bridged vxlan4: PMTU exceptions [FAIL]
  16970  03:10:41 DEBUG| [stdout] # TEST: IPv6, bridged vxlan4: PMTU exceptions - nexthop objects [FAIL]
  16971  03:10:43 DEBUG| [stdout] # TEST: IPv4, bridged vxlan6: PMTU exceptions [FAIL]
  16972  03:10:45 DEBUG| [stdout] # TEST: IPv4, bridged vxlan6: PMTU exceptions - nexthop objects [FAIL]
  16973  03:10:47 DEBUG| [stdout] # TEST: IPv6, bridged vxlan6: PMTU exceptions [FAIL]
  16974  03:10:49 DEBUG| [stdout] # TEST: IPv6, bridged vxlan6: PMTU exceptions - nexthop objects [FAIL]
  16975  03:10:50 DEBUG| [stdout] # TEST: IPv4, bridged geneve4: PMTU exceptions [FAIL]
  16976  03:10:52 DEBUG| [stdout] # TEST: IPv4, bridged geneve4: PMTU exceptions - nexthop objects [FAIL]
  16977  03:10:54 DEBUG| [stdout] # TEST: IPv6, bridged geneve4: PMTU exceptions [FAIL]
  16978  03:10:56 DEBUG| [stdout] # TEST: IPv6, bridged geneve4: PMTU exceptions - nexthop objects [FAIL]
  16979  03:10:58 DEBUG| [stdout] # TEST: IPv4, bridged geneve6: PMTU exceptions [FAIL]
  16980  03:10:59 DEBUG| [stdout] # TEST: IPv4, bridged geneve6: PMTU exceptions - nexthop objects [FAIL]
  16981  03:11:01 DEBUG| [stdout] # TEST: IPv6, bridged geneve6: PMTU exceptions [FAIL]
  16982  03:11:03 DEBUG| [stdout] # TEST: IPv6, bridged geneve6: PMTU exceptions - nexthop objects [FAIL]
  16983  03:11:03 DEBUG| [stdout] # ovs_bridge not supported
  16984  03:11:03 DEBUG| [stdout] # TEST: IPv4, OVS vxlan4: PMTU exceptions [SKIP]
  16985  03:11:04 DEBUG| [stdout] # ovs_bridge not supported
  16986  03:11:04 DEBUG| [stdout] # TEST: IPv6, OVS vxlan4: PMTU exceptions [SKIP]
  16987  03:11:04 DEBUG| [stdout] # ovs_bridge not supported
  16988  03:11:04 DEBUG| [stdout] # TEST: IPv4, OVS vxlan6: PMTU exceptions [SKIP]
  16989  03:11:04 DEBUG| [stdout] # ovs_bridge not supported
  16990  03:11:04 DEBUG| [stdout] # TEST: IPv6, OVS vxlan6: PMTU exceptions [SKIP]
  16991  03:11:05 DEBUG| [stdout] # ovs_bridge not supported
  16992  03:11:05 DEBUG| [stdout] # TEST: IPv4, OVS geneve4: PMTU exceptions [SKIP]
  16993  03:11:05 DEBUG| [stdout] # ovs_bridge not supported
  16994  03:11:05 DEBUG| [stdout] # TEST: IPv6, OVS geneve4: PMTU exceptions [SKIP]
  16995  03:11:05 DEBUG| [stdout] # ovs_bridge not supported
  16996  03:11:05 DEBUG| [stdout] # TEST: IPv4, OVS geneve6: PMTU exceptions [SKIP]
  16997  03:11:06 DEBUG| [stdout] # ovs_bridge not supported
  16998  03:11:06 DEBUG| [stdout] # TEST: IPv6, OVS geneve6: PMTU exceptions [SKIP]
  16999  03:11:06 DEBUG| [stdout] # TEST: IPv4 over fou4: PMTU exceptions [ OK ]
  17000  03:11:07 DEBUG| [stdout] # TEST: IPv4 over fou4: PMTU exceptions - nexthop objects [ OK ]
  17001  03:11:07 DEBUG| [stdout] # TEST: IPv6 over fou4: PMTU exceptions [ OK ]
  17002  03:11:08 DEBUG| [stdout] # TEST: IPv6 over fou4: PMTU exceptions - nexthop objects [ OK ]
  17003  03:11:08 DEBUG| [stdout] # TEST: IPv4 over fou6: PMTU exceptions [ OK ]
  17004  03:11:09 DEBUG| [stdout] # TEST: IPv4 over fou6: PMTU exceptions - nexthop objects [ OK ]
  17005  03:11:09 DEBUG| [stdout] # TEST: IPv6 over fou6: PMTU exceptions [ OK ]
  17006  03:11:09 DEBUG| [stdout] # TEST: IPv6 over fou6: PMTU exceptions - nexthop objects [ OK ]
  17007  03:11:10 DEBUG| [stdout] # TEST: IPv4 over gue4: PMTU exceptions [ OK ]
  17008  03:11:10 DEBUG| [stdout] # TEST: IPv4 over gue4: PMTU exceptions - nexthop objects [ OK ]
  17009  03:11:11 DEBUG| [stdout] # TEST: IPv6 over gue4: PMTU exceptions [ OK ]
  17010  03:11:11 DEBUG| [stdout] # TEST: IPv6 over gue4: PMTU exceptions - nexthop objects [ OK ]
  17011  03:11:12 DEBUG| [stdout] # TEST: IPv4 over gue6: PMTU exceptions [ OK ]
  17012  03:11:12 DEBUG| [stdout] # TEST: IPv4 over gue6: PMTU exceptions - nexthop objects [ OK ]
  17013  03:11:12 DEBUG| [stdout] # TEST: IPv6 over gue6: PMTU exceptions [ OK ]
  17014  03:11:13 DEBUG| [stdout] # TEST: IPv6 over gue6: PMTU exceptions - nexthop objects [ OK ]
  17015  03:11:13 DEBUG| [stdout] # TEST: IPv4 over IPv4: PMTU exceptions [ OK ]
  17016  03:11:14 DEBUG| [stdout] # TEST: IPv4 over IPv4: PMTU exceptions - nexthop objects [ OK ]
  17017  03:11:14 DEBUG| [stdout] # TEST: IPv6 over IPv4: PMTU exceptions [ OK ]
  17018  03:11:15 DEBUG| [stdout] # TEST: IPv6 over IPv4: PMTU exceptions - nexthop objects [ OK ]
  17019  03:11:15 DEBUG| [stdout] # TEST: IPv4 over IPv6: PMTU exceptions [ OK ]
  17020  03:11:15 DEBUG| [stdout] # TEST: IPv4 over IPv6: PMTU exceptions - nexthop objects [ OK ]
  17021  03:11:15 DEBUG| [stdout] # TEST: IPv6 over IPv6: PMTU exceptions [ OK ]
  17022  03:11:16 DEBUG| [stdout] # TEST: IPv6 over IPv6: PMTU exceptions - nexthop objects [ OK ]
  17023  03:11:16 DEBUG| [stdout] # TEST: vti6: PMTU exceptions [ OK ]
  17024  03:11:18 DEBUG| [stdout] # TEST: vti4: PMTU exceptions [ OK ]
  17025  03:11:18 DEBUG| [stdout] # TEST: vti6: PMTU exceptions (ESP-in-UDP) [ OK ]
  17026  03:11:20 DEBUG| [stdout] # TEST: vti4: PMTU exceptions (ESP-in-UDP) [ OK ]
  17027  03:11:21 DEBUG| [stdout] # TEST: vti6: PMTU exceptions, routed (ESP-in-UDP) [ OK ]
  17028  03:11:22 DEBUG| [stdout] # TEST: vti4: PMTU exceptions, routed (ESP-in-UDP) [ OK ]
  17029  03:11:23 DEBUG| [stdout] # TEST: vti4: default MTU assignment [ OK ]
  17030  03:11:23 DEBUG| [stdout] # TEST: vti6: default MTU assignment [ OK ]
  17031  03:11:24 DEBUG| [stdout] # TEST: vti4: MTU setting on link creation [ OK ]
  17032  03:11:25 DEBUG| [stdout] # TEST: vti6: MTU setting on link creation [ OK ]
  17033  03:11:25 DEBUG| [stdout] # TEST: vti6: MTU changes on link changes [ OK ]
  17034  03:11:26 DEBUG| [stdout] # TEST: ipv4: cleanup of cached exceptions [ OK ]
  17035  03:11:26 DEBUG| [stdout] # TEST: ipv4: cleanup of cached exceptions - nexthop objects [ OK ]
  17036  03:11:27 DEBUG| [stdout] # TEST: ipv6: cleanup of cached exceptions [ OK ]
  17037  03:11:28 DEBUG| [stdout] # TEST: ipv6: cleanup of cached exceptions - nexthop objects [ OK ]
  17038  03:11:50 DEBUG| [stdout] # TEST: ipv4: list and flush cached exceptions [ OK ]
  17039  03:12:11 DEBUG| [stdout] # TEST: ipv4: list and flush cached exceptions - nexthop objects [ OK ]
  17040  03:12:12 DEBUG| [stdout] # TEST: ipv6: list and flush cached exceptions [ OK ]
  17041  03:12:13 DEBUG| [stdout] # TEST: ipv6: list and flush cached exceptions - nexthop objects [ OK ]
  17042  03:12:13 DEBUG| [stdout] # TEST: ipv4: PMTU exception w/route replace [ OK ]
  17043  03:12:14 DEBUG| [stdout] # TEST: ipv4: PMTU exception w/route replace - nexthop objects [ OK ]
  17044  03:12:14 DEBUG| [stdout] # TEST: ipv6: PMTU exception w/route replace [ OK ]
  17045  03:12:15 DEBUG| [stdout] # TEST: ipv6: PMTU exception w/route replace - nexthop objects [ OK ]
  17046  03:12:15 DEBUG| [stdout] # TEST: ipv4: PMTU multipath nh exceptions [ OK ]
  17047  03:12:15 DEBUG| [stdout] # TEST: ipv4: PMTU multipath nh exceptions - nexthop objects [ OK ]
  17048  03:12:16 DEBUG| [stdout] not ok 1 selftests: net: pmtu.sh # exit=1
  17049  03:12:16 DEBUG| [stdout] make: Leaving directory '/home/ubuntu/autotest/client/tmp/ubuntu_kselftests_net/src/linux/tools/testing/selftests/net'
  17050  03:12:16 ERROR| Exception escaping from test:
  17051  Traceback (most recent call last):
  17052  File "/home/ubuntu/autotest/client/shared/test.py", line 411, in _exec
  17053  _call_test_function(self.execute, *p_args, **p_dargs)
  17054  ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  17055  File "/home/ubuntu/autotest/client/shared/test.py", line 823, in _call_test_function
  17056  return func(*args, **dargs)
  17057  File "/home/ubuntu/autotest/client/shared/test.py", line 290, in execute
  17058  self._call_run_once(constraints, profile_only,
  17059  ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
  17060  postprocess_profiled_run, args, dargs)
  17061  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  17062  File "/home/ubuntu/autotest/client/shared/test.py", line 212, in _call_run_once
  17063  self.run_once(*args, **dargs)
  17064  ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^
  17065  File "/home/ubuntu/autotest/client/tests/ubuntu_kselftests_net/ubuntu_kselftests_net.py", line 176, in run_once
  17066  raise error.TestError(test_name + ' failed.')
  17067  autotest.client.shared.error.TestError: net:pmtu.sh failed.
  17068  03:12:16 ERROR| child process failed
  17069  03:12:16 DEBUG| Traceback (most recent call last):
  17070  03:12:16 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 411, in _exec
  17071  03:12:16 DEBUG| _call_test_function(self.execute, *p_args, **p_dargs)
  17072  03:12:16 DEBUG| ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  17073  03:12:16 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 823, in _call_test_function
  17074  03:12:16 DEBUG| return func(*args, **dargs)
  17075  03:12:16 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 290, in execute
  17076  03:12:16 DEBUG| self._call_run_once(constraints, profile_only,
  17077  03:12:16 DEBUG| ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
  17078  03:12:16 DEBUG| postprocess_profiled_run, args, dargs)
  17079  03:12:16 DEBUG| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  17080  03:12:16 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 212, in _call_run_once
  17081  03:12:16 DEBUG| self.run_once(*args, **dargs)
  17082  03:12:16 DEBUG| ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^
  17083  03:12:16 DEBUG| File "/home/ubuntu/autotest/client/tests/ubuntu_kselftests_net/ubuntu_kselftests_net.py", line 176, in run_once
  17084  03:12:16 DEBUG| raise error.TestError(test_name + ' failed.')
  17085  03:12:16 DEBUG| autotest.client.shared.error.TestError: net:pmtu.sh failed.
  17086  03:12:16 DEBUG|
  17087  03:12:16 DEBUG| During handling of the above exception, another exception occurred:
  17088  03:12:16 DEBUG|
  17089  03:12:16 DEBUG| Traceback (most recent call last):
  17090  03:12:16 DEBUG| File "/home/ubuntu/autotest/client/parallel.py", line 25, in fork_start
  17091  03:12:16 DEBUG| l()
  17092  03:12:16 DEBUG| ~^^
  17093  03:12:16 DEBUG| File "/home/ubuntu/autotest/client/job.py", line 506, in <lambda>
  17094  03:12:16 DEBUG| l = lambda: test.runtest(self, url, tag, args, dargs)
  17095  03:12:16 DEBUG| ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  17096  03:12:16 DEBUG| File "/home/ubuntu/autotest/client/test.py", line 121, in runtest
  17097  03:12:16 DEBUG| common_test.runtest(job, url, tag, args, dargs, locals(), globals(),
  17098  03:12:16 DEBUG| ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  17099  03:12:16 DEBUG| job.sysinfo.log_before_each_test,
  17100  03:12:16 DEBUG| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  17101  03:12:16 DEBUG| job.sysinfo.log_after_each_test,
  17102  03:12:16 DEBUG| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  17103  03:12:16 DEBUG| job.sysinfo.log_before_each_iteration,
  17104  03:12:16 DEBUG| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  17105  03:12:16 DEBUG| job.sysinfo.log_after_each_iteration)
  17106  03:12:16 DEBUG| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  17107  03:12:16 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 913, in runtest
  17108  03:12:16 DEBUG| mytest._exec(args, dargs)
  17109  03:12:16 DEBUG| ~~~~~~~~~~~~^^^^^^^^^^^^^
  17110  03:12:16 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 434, in _exec
  17111  03:12:16 DEBUG| raise exc_info[0](exc_info[1]).with_traceback(exc_info[2])
  17112  03:12:16 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 411, in _exec
  17113  03:12:16 DEBUG| _call_test_function(self.execute, *p_args, **p_dargs)
  17114  03:12:16 DEBUG| ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  17115  03:12:16 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 823, in _call_test_function
  17116  03:12:16 DEBUG| return func(*args, **dargs)
  17117  03:12:16 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 290, in execute
  17118  03:12:16 DEBUG| self._call_run_once(constraints, profile_only,
  17119  03:12:16 DEBUG| ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
  17120  03:12:16 DEBUG| postprocess_profiled_run, args, dargs)
  17121  03:12:16 DEBUG| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  17122  03:12:16 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 212, in _call_run_once
  17123  03:12:16 DEBUG| self.run_once(*args, **dargs)
  17124  03:12:16 DEBUG| ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^
  17125  03:12:16 DEBUG| File "/home/ubuntu/autotest/client/tests/ubuntu_kselftests_net/ubuntu_kselftests_net.py", line 176, in run_once
  17126  03:12:16 DEBUG| raise error.TestError(test_name + ' failed.')
  17127  03:12:16 DEBUG| autotest.client.shared.error.TestError: net:pmtu.sh failed.
  17128  03:12:16 INFO | ERROR ubuntu_kselftests_net.net:pmtu.sh ubuntu_kselftests_net.net:pmtu.sh timestamp=1753240336 localtime=Jul 23 03:12:16 net:pmtu.sh failed.
  17129  03:12:16 INFO | END ERROR ubuntu_kselftests_net.net:pmtu.sh ubuntu_kselftests_net.net:pmtu.sh timestamp=1753240336 localtime=Jul 23 03:12:16
  17130  03:12:16 DEBUG| Persistent state client._record_indent now set to 1
  17131  03:12:16 DEBUG| Persistent state client.unexpected_reboot deleted
  17132  03:12:16 DEBUG| Test has timeout: 2700 sec.
  17133  03:12:16 INFO | START ubuntu_kselftests_net.net:udpgso.sh ubuntu_kselftests_net.net:udpgso.sh timeout=2700 timestamp=1753240336 localtime=Jul 23 03:12:16
  17134  03:12:16 DEBUG| Persistent state client._record_indent now set to 2
  17135  03:12:16 DEBUG| Persistent state client.unexpected_reboot now set to ('ubuntu_kselftests_net.net:udpgso.sh', 'ubuntu_kselftests_net.net:udpgso.sh')

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References

[Bug 2122688] [NEW] plucky:ubuntu_kselftests_net:ptmu.sh IPv4/IPv6 PTMU exceptions on s390x.lpar
From: Mehmet Basaran, 2025-09-12