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[Po-Hsu Lin <2028755@xxxxxxxxxxxxxxxxxx>]

This issue can be found on openstack PowerPC VM since
6.5.0-34.34~22.04.2 in sru-2024.04.01. After
https://github.com/torvalds/linux/commit/98cb12eb52a780e682bea8372fdb2912c08132dd
landed in our 6.5 tree.

** Tags added: 6.5 jammy sru-20240429

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Title:
  udpgro_frglist.sh in net from ubuntu_kernel_selftests crashes Power10
  LPAR

Status in ubuntu-kernel-tests:
  New

Bug description:
  The upd test in udpgro_frglist.sh from ubuntu_kernel_selftests/net
  will crash the Power10 LPAR with Lunar 6.2.0-27.28. This should not be
  considered as this is the first cycle that we have P10 support.

  It 100% reproducible when you run the udpgro_frglist.sh script int linux/tools/testing/selftests/net/:
  $ sudo ./udpgro_frglist.sh
  ipv6
  tcp - over veth touching data
  -l 4 -6 -D 2001:db8::1 -t rx -4 -t
  -4 -t
  tcp tx:    531 MB/s     9015 calls/s   9015 msg/s
  tcp rx:    531 MB/s     5699 calls/s
  tcp tx:    539 MB/s     9149 calls/s   9149 msg/s
  tcp rx:    539 MB/s     5353 calls/s
  tcp tx:    529 MB/s     8975 calls/s   8975 msg/s
  tcp rx:    546 MB/s     5742 calls/s
  tcp tx:    534 MB/s     9063 calls/s   9063 msg/s
  udp gso - over veth touching data
  -l 4 -6 -D 2001:db8::1 -u -S 0 rx -4 -v
  -4 -v
  packet_write_wait: Connection to 10.245.68.210 port 22: Broken pipe

  With "set -x" added before starting the udp test we can see that it's crashing with "./in_netns.sh ./udpgro_frglist.sh __subprocess -l 4 -6 -D 2001:db8::1 -u -S 0 rx -4 -v":
  + run_udp '-l 4 -6  -D 2001:db8::1'
  + local -r 'args=-l 4 -6  -D 2001:db8::1'
  + echo 'udp gso - over veth touching data'
  udp gso - over veth touching data
  + run_in_netns -l 4 -6 -D 2001:db8::1 -u -S 0 rx -4 -v
  + local -r 'args=-l 4 -6 -D 2001:db8::1 -u -S 0 rx -4 -v'
  + echo -l 4 -6 -D 2001:db8::1 -u -S 0 rx -4 -v
  -l 4 -6 -D 2001:db8::1 -u -S 0 rx -4 -v
  + ./in_netns.sh ./udpgro_frglist.sh __subprocess -l 4 -6 -D 2001:db8::1 -u -S 0 rx -4 -v
  -4 -v
  packet_write_wait: Connection to 10.245.68.210 port 22: Broken pipe

  No output captured from demsg:
  [ 3197.958338] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
  [ 3197.958372] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
  [ 3197.970123] NET: Registered PF_ALG protocol family
  [ 3202.293708] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
  [ 3202.293739] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
  packet_write_wait: Connection to 10.245.68.210 port 22: Broken pipe

  We might need to use console to see what's going on here.

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