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[Bug 2046148] [NEW] pkey01 and futex_wake04 from ubuntu_ltp_syscalls failed with X-kvm (Fail to open /proc/sys/vm/compact_memory for writing)

To: canonical-ubuntu-qa@xxxxxxxxxxxxxxxxxxx
From: Po-Hsu Lin <2046148@xxxxxxxxxxxxxxxxxx>
Date: Mon, 11 Dec 2023 10:46:36 -0000
Reply-to: Bug 2046148 <2046148@xxxxxxxxxxxxxxxxxx>
Sender: noreply@xxxxxxxxxxxxx

Public bug reported:

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

These 2 failures are limited to X-kvm kernel and they're all failing with the same error message, I didn't see this failure on other 4.4 variants (X, X-aws, T-lts-X).
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>>>


Before this change the 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>>>

Note that the pkey01 test used to fail before updating to LTP-20230516

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

** Affects: ubuntu-kernel-tests
     Importance: Undecided
         Status: New


** Tags: 4.4 linux-kvm ubuntu-ltp-syscalls xenial

** Summary changed:

- pkey01 from ubuntu_ltp_syscalls failed with X-kvm (Fail to open /proc/sys/vm/compact_memory for writing)
+ pkey01 and futex_wake04 from ubuntu_ltp_syscalls failed with X-kvm (Fail to open /proc/sys/vm/compact_memory for writing)

** Description changed:

  This issue pops up after updating to the latest tip of LTP test suite
  (commit 776b57984 "rwtest: Remove df symlink check")
  
- This failure is limited to X-kvm kernel, I didn't see this failure on other 4.4 variants (X, X-aws, T-lts-X).
+ These 2 failures are limited to X-kvm kernel and they're all failing with the same error message, I didn't see this failure on other 4.4 variants (X, X-aws, T-lts-X).
  Bisect shows this issue is caused by acf46111b5 "hugetlb: compacting memory to reduce fragmental pages" [1]
  
- Test log:
+ 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>>>
  
  
  Before this change the 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>>>
  
  Note that the pkey01 test used to fail before updating to LTP-20230516
  
  [1] https://github.com/linux-test-
  project/ltp/commit/acf46111b5cc0f4bfb2309a797f5b1a937e47ff8

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

Title:
  pkey01 and futex_wake04 from ubuntu_ltp_syscalls failed with X-kvm
  (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 2 failures are limited to X-kvm kernel and they're all failing with the same error message, I didn't see this failure on other 4.4 variants (X, X-aws, T-lts-X).
  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>>>

  
  Before this change the 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>>>

  Note that the pkey01 test used to fail before updating to LTP-20230516

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

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Follow ups

[Bug 2046148] Re: pkey01, futex_wake04 and memfd_create03 from ubuntu_ltp_syscalls failed with kvm kernel (Fail to open /proc/sys/vm/compact_memory for writing)
From: Po-Hsu Lin, 2024-01-22
[Bug 2046148] Re: pkey01, futex_wake04 and memfd_create03 from ubuntu_ltp_syscalls failed with X-kvm (Fail to open /proc/sys/vm/compact_memory for writing)
From: Po-Hsu Lin, 2023-12-14
[Bug 2046148] Re: pkey01 and futex_wake04 from ubuntu_ltp_syscalls failed with X-kvm (Fail to open /proc/sys/vm/compact_memory for writing)
From: Po-Hsu Lin, 2023-12-14
[Bug 2046148] Re: pkey01 and futex_wake04 from ubuntu_ltp_syscalls failed with X-kvm (Fail to open /proc/sys/vm/compact_memory for writing)
From: Po-Hsu Lin, 2023-12-11