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[Po-Hsu Lin <2046148@xxxxxxxxxxxxxxxxxx>]

** Tags added: 4.15 bionic

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https://bugs.launchpad.net/bugs/2046148

Title:
  pkey01, futex_wake04 and memfd_create03 from ubuntu_ltp_syscalls
  failed with kvm kernel (Fail to open /proc/sys/vm/compact_memory for
  writing)

Status in ubuntu-kernel-tests:
  New

Bug description:
  This issue pops up after updating to the latest tip of LTP test suite
  (commit 776b57984 "rwtest: Remove df symlink check")

  These failures are limited to kvm kernels and they're all failing with the same error message. memfd_create03 failure can only be found on newer kernels as it requires 4.14+.
  Bisect shows this issue is caused by acf46111b5 "hugetlb: compacting memory to reduce fragmental pages" [1]

  Test log for pkey01:
  <<<test_start>>>
  tag=pkey01 stime=1702291503
  cmdline="pkey01"
  contacts=""
  analysis=exit
  <<<test_output>>>
  incrementing stop
  tst_hugepage.c:50: TBROK: Failed to open FILE '/proc/sys/vm/compact_memory' for writing: ENOENT (2)
  <<<execution_status>>>
  initiation_status="ok"
  duration=0 termination_type=exited termination_id=2 corefile=no
  cutime=0 cstime=24
  <<<test_end>>>

  Test log for futex_wake04:
  <<<test_start>>>
  tag=futex_wake04 stime=1702291801
  cmdline="futex_wake04"
  contacts=""
  analysis=exit
  <<<test_output>>>
  incrementing stop
  tst_hugepage.c:50: TBROK: Failed to open FILE '/proc/sys/vm/compact_memory' for writing: ENOENT (2)
  <<<execution_status>>>
  initiation_status="ok"
  duration=0 termination_type=exited termination_id=2 corefile=no
  cutime=0 cstime=0
  <<<test_end>>>

  Test log for memfd_create03:
  INFO: Test start time: Wed Dec 13 12:08:19 UTC 2023
  COMMAND:    /opt/ltp/bin/ltp-pan -q  -e -S   -a 869738     -n 869738  -f /tmp/ltp-fjHcQSE5qj/alltests -l /dev/null  -C /dev/null -T /dev/null
  LOG File: /dev/null
  FAILED COMMAND File: /dev/null
  TCONF COMMAND File: /dev/null
  Running tests.......
  tst_hugepage.c:50: TBROK: Failed to open FILE '/proc/sys/vm/compact_memory' for writing: ENOENT (2)
  INFO: ltp-pan reported some tests FAIL
  LTP Version: 20230929
  INFO: Test end time: Wed Dec 13 12:08:19 UTC 2023

  
  Before this change the pkey01 test will be skipped with:
  <<<test_start>>>
  tag=pkey01 stime=1702290779
  cmdline="pkey01"
  contacts=""
  analysis=exit
  <<<test_output>>>
  incrementing stop
  tst_hugepage.c:83: TINFO: 1 hugepage(s) reserved
  tst_test.c:1560: TINFO: Timeout per run is 0h 00m 30s
  pkey.h:27: TCONF: syscall(330) __NR_pkey_alloc not supported on your arch

  Summary:
  passed   0
  failed   0
  broken   0
  skipped  1
  warnings 0
  <<<execution_status>>>
  initiation_status="ok"
  duration=0 termination_type=exited termination_id=32 corefile=no
  cutime=0 cstime=0
  <<<test_end>>>

  The futex_wake04 test will pass with:
  <<<test_start>>>
  tag=futex_wake04 stime=1702292456
  cmdline="futex_wake04"
  contacts=""
  analysis=exit
  <<<test_output>>>
  incrementing stop
  tst_hugepage.c:83: TINFO: 1 hugepage(s) reserved
  tst_test.c:1560: TINFO: Timeout per run is 0h 00m 30s
  futex_wake04.c:52: TINFO: Testing variant: syscall with old kernel spec
  futex_wake04.c:90: TINFO: Hugepagesize 2097152
  futex_utils.h:59: TINFO: Thread 17485 not sleeping yet
  futex_wake04.c:75: TPASS: Hi hydra, thread2 awake!

  Summary:
  passed   1
  failed   0
  broken   0
  skipped  0
  warnings 0
  <<<execution_status>>>

  The memfd_create03 test will pass with:
  INFO: Test start time: Sat Oct 21 02:09:35 UTC 2023
  COMMAND:    /opt/ltp/bin/ltp-pan -q  -e -S   -a 868820     -n 868820  -f /tmp/ltp-a3y6bz0RdQ/alltests -l /dev/null  -C /dev/null -T /dev/null
  LOG File: /dev/null
  FAILED COMMAND File: /dev/null
  TCONF COMMAND File: /dev/null
  Running tests.......
  tst_hugepage.c:83: TINFO: 1 hugepage(s) reserved
  tst_test.c:1558: TINFO: Timeout per run is 0h 00m 30s
  memfd_create03.c:171: TINFO: --TESTING WRITE CALL IN HUGEPAGES--
  memfd_create03.c:176: TINFO: memfd_create() succeeded
  memfd_create03.c:70: TPASS: write(3, "LTP", 3) failed as expected

  memfd_create03.c:171: TINFO: --TESTING PAGE SIZE OF CREATED FILE--
  memfd_create03.c:176: TINFO: memfd_create() succeeded
  memfd_create03.c:43: TINFO: mmap((nil), 2097152, 2, 2, 3, 0) succeeded
  memfd_create03.c:92: TINFO: munmap(0x7fd6d3600000, 512kB) failed as expected
  memfd_create03.c:92: TINFO: munmap(0x7fd6d3600000, 1024kB) failed as expected
  memfd_create03.c:92: TINFO: munmap(0x7fd6d3600000, 1536kB) failed as expected
  memfd_create03.c:111: TPASS: munmap() fails for page sizes less than 2048kB

  memfd_create03.c:171: TINFO: --TESTING HUGEPAGE ALLOCATION LIMIT--
  memfd_create03.c:176: TINFO: memfd_create() succeeded
  memfd_create03.c:43: TINFO: mmap((nil), 2097152, 2, 2, 3, 0) succeeded
  memfd_create03.c:131: TINFO: memfd_create() succeeded
  memfd_create03.c:136: TPASS: mmap((nil), 2097152, 0, 2, 4, 0) failed as expected

  Summary:
  passed   3
  failed   0
  broken   0
  skipped  0
  warnings 0
  INFO: ltp-pan reported all tests PASS
  LTP Version: 20230516
  INFO: Test end time: Sat Oct 21 02:09:35 UTC 2023

  
  [1] https://github.com/linux-test-project/ltp/commit/acf46111b5cc0f4bfb2309a797f5b1a937e47ff8

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