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[Po-Hsu Lin <2075275@xxxxxxxxxxxxxxxxxx>]

This is not affect Noble 6.8, despite the test output is identical:

 Running 'make run_tests -C memfd TEST_PROGS=run_hugetlbfs_test.sh TEST_GEN_PROGS='' TEST_CUSTOM_PROGS='''
 make: Entering directory '/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/memfd'
 TAP version 13
 1..1
 # timeout set to 45
 # selftests: memfd: run_hugetlbfs_test.sh
 # memfd-hugetlb: CREATE
 # memfd-hugetlb: BASIC
 # memfd-hugetlb: SEAL-EXEC
 # memfd-hugetlb:    Apply SEAL_EXEC
 # fchmod(/memfd:kern_memfd_seal_exec (deleted), 00777) didn't fail as expected
 # ./run_hugetlbfs_test.sh: line 60: 15915 Aborted                 (core dumped) ./memfd_test hugetlbfs
 # opening: ./mnt/memfd
 # ADD_SEALS(6, 0 -> 8) failed: Device or resource busy
 # 8 != 0 = GET_SEALS(6)
 # Aborted (core dumped)
 ok 1 selftests: memfd: run_hugetlbfs_test.sh

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https://bugs.launchpad.net/bugs/2075275

Title:
  run_hugetlbfs_test.sh in memfd of ubuntu_kernel_selftests causing sut-
  test failure on J-6.8

Status in ubuntu-kernel-tests:
  New

Bug description:
  Found on Jammy 6.8 variants since 2024.04.29:
    * J-oracle-6.8.0-1006.6~22.04.3 (2024.04.29)
    * J-azure-6.8.0-1008.8~22.04.1 (2024.04.29)
    * J-aws-6.8.0-1009.9~22.04.2 (2024.04.29)
    * J-gcp-6.8.0-1010.11~22.04.1 (2024.06.10)
    * J-hwe-6.8.0-38.38~22.04.1 (2024.06.10)
    * J-ibm-6.8.0-1008.8~22.04.1 (2024.06.10)
    * J-lowlatency-hwe-6.8.0-38.38.1~22.04.2 (2024.06.10)
    * J-nvidia-6.8.0-1009.9~22.04.1 (2024.06.10)
    * J-realtime-6.8.1-1004.4~22.04.1 (2024.06.10)

  When trying to run the memfd test in ubuntu_kernel_selftests, the
  run_hugetlbfs_test.sh sub-test will have a leftover process the
  prevents the test to finish properly, and consequently causing sut-
  test failure in our infrastructure.

  $ cd ~/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/
  $ sudo make TARGETS=memfd
  $ cd memfd
  $ sudo ./run_hugetlbfs_test.sh
  memfd-hugetlb: CREATE
  memfd-hugetlb: BASIC
  memfd-hugetlb: SEAL-EXEC
  memfd-hugetlb:	Apply SEAL_EXEC
  fchmod(/memfd:kern_memfd_seal_exec (deleted), 00777) didn't fail as expected
  ./run_hugetlbfs_test.sh: line 60:  1424 Aborted                 (core dumped) ./memfd_test hugetlbfs
  fusermount: failed to unmount /home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/memfd/mnt: Invalid argument
  eopening: ./mnt/memfd
  cho $?ADD_SEALS(4, 0 -> 8) failed: Device or resource busy
  8 != 0 = GET_SEALS(4)
  Aborted (core dumped)
  $ echo $?
  0
  $ ps aux | grep fuse
  root        1431  0.0  0.0 150776  1292 ?        Ssl  01:50   0:00 ./fuse_mnt ./mnt
  ubuntu      1454  0.0  0.0   7008  2304 pts/0    S+   01:50   0:00 grep --color=auto fuse

  Nothing interesting in dmesg output.

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