udpgso_bench.sh in net from ubuntu_kernel_selftests failed on F-5.4 zVM

Issue found on 5.4.0-49.53 s390x zVM node kernel04 (this issue does not exist on other arches, not even the s390x LPAR)

Test failed with:
 # selftests: net: udpgso_bench.sh
 # ipv4
 # tcp
 # tcp tx: 4236 MB/s 71851 calls/s 71851 msg/s
 # tcp rx: 4241 MB/s 56479 calls/s
 # tcp tx: 4980 MB/s 84466 calls/s 84466 msg/s
 # tcp rx: 4983 MB/s 40178 calls/s
 # tcp tx: 5048 MB/s 85630 calls/s 85630 msg/s
 # tcp zerocopy
 # tcp tx: 4169 MB/s 70724 calls/s 70724 msg/s
 # tcp rx: 4174 MB/s 33181 calls/s
 # tcp tx: 4215 MB/s 71502 calls/s 71502 msg/s
 # tcp rx: 4219 MB/s 33107 calls/s
 # tcp tx: 4233 MB/s 71796 calls/s 71796 msg/s
 # udp
 # udp rx: 337 MB/s 240241 calls/s
 # udp tx: 443 MB/s 315672 calls/s 7516 msg/s
 # udp rx: 510 MB/s 363643 calls/s
 # udp tx: 520 MB/s 370734 calls/s 8827 msg/s
 # udp rx: 520 MB/s 370723 calls/s
 # udp tx: 519 MB/s 370314 calls/s 8817 msg/s
 # udp gso
 # udp tx: 1205 MB/s 20448 calls/s 20448 msg/s
 # udp rx: 268 MB/s 191557 calls/s
 # udp tx: 1131 MB/s 19188 calls/s 19188 msg/s
 # udp rx: 476 MB/s 339079 calls/s
 # udp tx: 1151 MB/s 19526 calls/s 19526 msg/s
 # udp gso zerocopy
 # udp rx: 886 MB/s 631746 calls/s
 # udp tx: 918 MB/s 15577 calls/s 15577 msg/s
 # udp rx: 919 MB/s 655080 calls/s
 # udp tx: 919 MB/s 15588 calls/s 15588 msg/s
 # udp tx: 927 MB/s 15729 calls/s 15729 msg/s
 # udp rx: 928 MB/s 661271 calls/s
 # udp gso timestamp
 # udp rx: 767 MB/s 547047 calls/s
 # udp tx: 1120 MB/s 19005 calls/s 19005 msg/s
 # udp tx: 1148 MB/s 19486 calls/s 19486 msg/s
 # udp rx: 1141 MB/s 813354 calls/s
 # udp tx: 1145 MB/s 19431 calls/s 19431 msg/s
 # udp gso zerocopy audit
 # udp tx: 912 MB/s 15473 calls/s 15473 msg/s
 # udp rx: 188 MB/s 134486 calls/s
 # udp tx: 936 MB/s 15884 calls/s 15884 msg/s
 # udp rx: 795 MB/s 566798 calls/s
 # udp tx: 932 MB/s 15819 calls/s 15819 msg/s
 # Summary over 3.000 seconds...
 # sum udp tx: 949 MB/s 47176 calls (15725/s) 47176 msgs (15725/s)
 # Zerocopy acks: 47176
 # udp gso timestamp audit
 # udp rx: 520 MB/s 370445 calls/s
 # udp tx: 1191 MB/s 20204 calls/s 20204 msg/s
 # udp tx: 1237 MB/s 20981 calls/s 20981 msg/s
 # udp rx: 351 MB/s 250289 calls/s
 # udp tx: 1264 MB/s 21453 calls/s 21453 msg/s
 # Summary over 3.000 seconds...
 # sum udp tx: 1260 MB/s 62638 calls (20879/s) 62638 msgs (20879/s)
 # Tx Timestamps: 62638 received 0 errors
 # udp gso zerocopy timestamp audit
 # udp rx: 366 MB/s 261352 calls/s
 # udp tx: 916 MB/s 15545 calls/s 15545 msg/s
 # udp rx: 904 MB/s 644237 calls/s
 # udp tx: 903 MB/s 15323 calls/s 15323 msg/s
 # udp rx: 906 MB/s 645458 calls/s
 # udp tx: 905 MB/s 15360 calls/s 15360 msg/s
 # Summary over 3.000 seconds...
 # sum udp tx: 930 MB/s 46228 calls (15409/s) 46228 msgs (15409/s)
 # Tx Timestamps: 46228 received 0 errors
 # Zerocopy acks: 46228
 # ipv6
 # tcp
 # ./udpgso_bench_tx: connect: Connection refused
 # tcp zerocopy
 # tcp tx: 4162 MB/s 70607 calls/s 70607 msg/s
 # tcp rx: 5619 MB/s 40473 calls/s
 # tcp tx: 4572 MB/s 77552 calls/s 77552 msg/s
 # tcp rx: 4519 MB/s 30988 calls/s
 # tcp tx: 4253 MB/s 72138 calls/s 72138 msg/s
 # udp
 # udp rx: 255 MB/s 186402 calls/s
 # udp tx: 456 MB/s 333164 calls/s 7748 msg/s
 # udp rx: 453 MB/s 330992 calls/s
 # udp tx: 498 MB/s 363737 calls/s 8459 msg/s
 # udp tx: 490 MB/s 357889 calls/s 8323 msg/s
 # udp gso
 # udp rx: 371 MB/s 271142 calls/s
 # udp tx: 1150 MB/s 19513 calls/s 19513 msg/s
 # udp tx: 1147 MB/s 19465 calls/s 19465 msg/s
 # udp rx: 1148 MB/s 837747 calls/s
 # udp tx: 1148 MB/s 19482 calls/s 19482 msg/s
 # udp gso zerocopy
 # udp rx: 790 MB/s 576627 calls/s
 # udp tx: 901 MB/s 15282 calls/s 15282 msg/s
 # udp rx: 900 MB/s 656829 calls/s
 # udp tx: 899 MB/s 15260 calls/s 15260 msg/s
 # udp tx: 902 MB/s 15311 calls/s 15311 msg/s
 # udp gso timestamp
 # udp rx: 856 MB/s 624626 calls/s
 # udp tx: 1132 MB/s 19207 calls/s 19207 msg/s
 # udp rx: 1109 MB/s 809432 calls/s
 # udp tx: 1108 MB/s 18806 calls/s 18806 msg/s
 # udp tx: 1108 MB/s 18797 calls/s 18797 msg/s
 # udp rx: 1109 MB/s 809131 calls/s
 # udp gso zerocopy audit
 # udp rx: 717 MB/s 523247 calls/s
 # udp tx: 902 MB/s 15310 calls/s 15310 msg/s
 # udp rx: 903 MB/s 659073 calls/s
 # udp tx: 902 MB/s 15312 calls/s 15312 msg/s
 # udp rx: 902 MB/s 658063 calls/s
 # udp tx: 901 MB/s 15290 calls/s 15290 msg/s
 # Summary over 3.000 seconds...
 # sum udp tx: 923 MB/s 45912 calls (15304/s) 45912 msgs (15304/s)
 # Zerocopy acks: 45912
 # udp gso timestamp audit
 # udp tx: 1105 MB/s 18753 calls/s 18753 msg/s
 # udp rx: 1017 MB/s 741707 calls/s
 # udp tx: 1198 MB/s 20323 calls/s 20323 msg/s
 # udp rx: 301 MB/s 220002 calls/s
 # udp tx: 1113 MB/s 18879 calls/s 18879 msg/s
 # Summary over 3.000 seconds...
 # sum udp tx: 1166 MB/s 57955 calls (19318/s) 57955 msgs (19318/s)
 # Tx Timestamps: 57955 received 0 errors
 # udp gso zerocopy timestamp audit
 # udp rx: 690 MB/s 503352 calls/s
 # udp tx: 879 MB/s 14911 calls/s 14911 msg/s
 # udp rx: 876 MB/s 639074 calls/s
 # udp tx: 875 MB/s 14853 calls/s 14853 msg/s
 # udp tx: 876 MB/s 14871 calls/s 14871 msg/s
 # Summary over 3.000 seconds...
 # sum udp tx: 898 MB/s 44635 calls (14878/s) 44635 msgs (14878/s)
 # Tx Timestamps: 44635 received 0 errors
 # Zerocopy acks: 44635
 # udpgso_bench.sh: PASS=17 SKIP=0 FAIL=1
 # udpgso_bench.sh: [0;31mFAIL[0m
 not ok 19 selftests: net: udpgso_bench.sh # exit=1

This issue can be found on 5.4.0-48.52 zVM as well, not a regression.