It looks like this failure comes from this "hugetlbfs sealing" test case:
https://github.com/torvalds/linux/commit/724978457fe29626bb6ce78e6c324c9d2648dcf7#diff-4e7dd2f5018b2be2ef6b3decbbb301809019580254f09335a85506a27cdc5b79

And this test case is part of the following kernel commit:
[0/6] memfd: add sealing to hugetlb-backed memory
https://lore.kernel.org/patchwork/cover/846262/

Maybe next is to check if these patches can make this test pass.

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https://bugs.launchpad.net/bugs/1910277

Title:
  core dump in hugetlbfs_test in 5.8.0-34.37 ADT test failure with linux
  5.8.0-34.37

Status in ubuntu-kernel-tests:
  New
Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Not a regression. Found occuring on previous kernels including
  5.8.0-29.31

  Testing failed on:
      amd64: 
https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-groovy/groovy/amd64/l/linux/20201218_030102_175b9@/log.gz
      arm64: 
https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-groovy/groovy/arm64/l/linux/20201217_165622_90478@/log.gz
      ppc64el: 
https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-groovy/groovy/ppc64el/l/linux/20201217_103407_ff212@/log.gz
      s390x: 
https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-groovy/groovy/s390x/l/linux/20201217_095421_b8712@/log.gz


  
  09:03:05 DEBUG| [stdout] # selftests: memfd: run_hugetlbfs_test.sh
  09:03:05 DEBUG| [stdout] # ./run_hugetlbfs_test.sh: line 47: [: -lt: unary 
operator expected
  09:03:05 DEBUG| [stdout] # ./run_hugetlbfs_test.sh: line 60: 1125253 Aborted  
               (core dumped) ./memfd_test hugetlbfs
  09:03:06 DEBUG| [stdout] # Aborted (core dumped)
  09:03:06 DEBUG| [stdout] ok 3 selftests: memfd: run_hugetlbfs_test.sh
  09:03:06 DEBUG| [stdout] make[1]: Leaving directory 
'/tmp/autopkgtest.rVm8As/build.9pm/src/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/memfd'
  09:03:06 DEBUG| [stdout] make: Leaving directory 
'/tmp/autopkgtest.rVm8As/build.9pm/src/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests'
  09:03:06 INFO | ========== Summary ===========
  09:03:06 INFO | No failed cases reported

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