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[Po-Hsu Lin <2055473@xxxxxxxxxxxxxxxxxx>]

** Description changed:

+ 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)

** Tags added: jammy sru-s20231030

** Tags added: gcp

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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:
  New
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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