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[Bug 2055473] Re: pmtu.sh net selftest fail with PMTU exception wasn't created after exceeding MTU

 

Ubuntu 23.10 (Mantic Minotaur) has reached end of life, so this bug will
not be fixed for that specific release.

** Changed in: linux (Ubuntu Mantic)
       Status: New => Won't Fix

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https://bugs.launchpad.net/bugs/2055473

Title:
  pmtu.sh net selftest fail with PMTU exception wasn't created after
  exceeding MTU

Status in ubuntu-kernel-tests:
  New
Status in linux package in Ubuntu:
  New
Status in linux source package in Mantic:
  Won't Fix
Status in linux source package in Noble:
  New

Bug description:
  Issue found on J-gcp-6.5.0-1015.15~22.04.1 and M-gcp-6.5.0-1015.15 in
  cycle sru-20240205

  And can be reproduced with generic kernel on GCP cloud.

  This is not a regression but something emerges after the pmtu.sh
  result parsing logic update, which landed via stable update in
  sru-20240205 cycle (bug 2043198)

  Dive into test history, we can see this failure all the way back to
  sru-20231030 with M-6.5.0-1010.10 on GCP cloud.

  19:48:21 DEBUG| [stdout] # selftests: net: pmtu.sh
  19:48:21 DEBUG| [stdout] # TEST: ipv4: PMTU exceptions                                         [ OK ]
  19:48:21 DEBUG| [stdout] # TEST: ipv4: PMTU exceptions - nexthop objects                       [ OK ]
  19:48:22 DEBUG| [stdout] # TEST: ipv6: PMTU exceptions                                         [ OK ]
  19:48:22 DEBUG| [stdout] # TEST: ipv6: PMTU exceptions - nexthop objects                       [ OK ]
  19:48:23 DEBUG| [stdout] # TEST: ICMPv4 with DSCP and ECN: PMTU exceptions                     [FAIL]
  19:48:23 DEBUG| [stdout] #   PMTU exception wasn't created after exceeding MTU
  19:48:24 DEBUG| [stdout] # TEST: ICMPv4 with DSCP and ECN: PMTU exceptions - nexthop objects   [FAIL]
  19:48:24 DEBUG| [stdout] #   PMTU exception wasn't created after exceeding MTU
  19:48:25 DEBUG| [stdout] # TEST: UDPv4 with DSCP and ECN: PMTU exceptions                      [FAIL]
  19:48:25 DEBUG| [stdout] #   PMTU exception wasn't created after exceeding MTU
  19:48:25 DEBUG| [stdout] # TEST: UDPv4 with DSCP and ECN: PMTU exceptions - nexthop objects    [FAIL]
  19:48:25 DEBUG| [stdout] #   PMTU exception wasn't created after exceeding MTU
  ....

  Logfile also attached (rt.log)

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References