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[Po-Hsu Lin <2092749@xxxxxxxxxxxxxxxxxx>]

https://lore.kernel.org/linux-kselftest/20250102064807.404607-1-po-
hsu.lin@xxxxxxxxxxxxx/T/#t

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https://bugs.launchpad.net/bugs/2092749

Title:
  run_hugetlbfs_test.sh in memfd of ubuntu_kernel_selftests cause core
  dump on f/ein

Status in ubuntu-kernel-tests:
  New

Bug description:
  Issue found on f/ein 5.4.0-1062, I assume it's the cause of sut-test
  failure like what we see in bug 2075275

  Test log:
   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
   # selftests: memfd: run_hugetlbfs_test.sh
   # ./run_hugetlbfs_test.sh: line 47: [: -lt: unary operator expected
   # ./run_hugetlbfs_test.sh: line 60: 12577 Aborted                 (core dumped) ./memfd_test hugetlbfs
   # Aborted (core dumped)
   ok 1 selftests: memfd: run_hugetlbfs_test.sh
   make: Leaving directory '/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/memfd'

  From the test script on Focal:
  https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/tree/tools/testing/selftests/memfd/run_hugetlbfs_test.sh

  There is no "HugePages_Free:" in /proc/meminfo, therefore freepgs is
  empty. This is the cause of "# ./run_hugetlbfs_test.sh: line 47: [:
  -lt: unary operator expected" failure. And test should bail out here.

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