pmtu.sh net selftest fail with PMTU dst likely leaked (can't delete veth device in a timely manner, PMTU dst likely leaked)

[Thadeu Lima de Souza Cascardo]

https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-focal/focal/ppc64el/l/linux/20200528_044656_7f57a@/log.gz

[...]
03:48:34 DEBUG| [stdout] # TEST: ipv6: cleanup of cached exceptions - nexthop objects [FAIL]
03:48:34 DEBUG| [stdout] # can't delete veth device in a timely manner, PMTU dst likely leaked
[...]
03:49:17 DEBUG| [stdout] not ok 16 selftests: net: pmtu.sh # exit=1

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1881643

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Kelsey Skunberg (kelsey-skunberg)]

Different output for Groovy/linux 5.8.0-30.32 on s390x

19:34:43 DEBUG| [stdout] # TEST: ipv4: cleanup of cached exceptions [ OK ]
19:34:44 DEBUG| [stdout] # TEST: ipv4: cleanup of cached exceptions - nexthop objects [FAIL]
19:34:44 DEBUG| [stdout] # can't delete veth device in a timely manner, PMTU dst likely leaked