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[Po-Hsu Lin <po-hsu.lin@xxxxxxxxxxxxx>]

** Changed in: linux (Ubuntu)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1833028

Title:
  fanotify06 from ubuntu_ltp_syscalls failed

Status in ubuntu-kernel-tests:
  In Progress
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Confirmed
Status in linux source package in Disco:
  Fix Released

Bug description:
  == SRU Justification ==
  fanotify06 test from ubuntu_ltp_syscalls reported that test #1 for
  overlayfs has received more than one expected event:
    <<<test_start>>>
    tag=fanotify06 stime=1560747299
    cmdline="fanotify06"
    contacts=""
    analysis=exit
    <<<test_output>>>
    incrementing stop
    tst_device.c:231: INFO: Using test device LTP_DEV='/dev/loop2'
    tst_mkfs.c:90: INFO: Formatting /dev/loop2 with ext2 opts='' extra opts=''
    mke2fs 1.44.6 (5-Mar-2019)
    tst_test.c:1112: INFO: Timeout per run is 0h 05m 00s
    fanotify06.c:169: INFO: Test #0: Fanotify merge mount mark
    fanotify06.c:147: PASS: group 0 got event: mask 2 pid=1136 fd=15
    ....
    fanotify06.c:230: PASS: group 8 got no event
    fanotify06.c:169: INFO: Test #1: Fanotify merge overlayfs mount mark
    fanotify06.c:208: FAIL: group 0 got more than one event (48 > 24)
    fanotify06.c:208: FAIL: group 1 got more than one event (48 > 24)
    fanotify06.c:208: FAIL: group 2 got more than one event (48 > 24)
    fanotify06.c:220: FAIL: group 3 got event
    fanotify06.c:220: FAIL: group 4 got event
    fanotify06.c:220: FAIL: group 5 got event
    fanotify06.c:220: FAIL: group 6 got event
    fanotify06.c:220: FAIL: group 7 got event
    fanotify06.c:220: FAIL: group 8 got event

    Summary:
    passed 9
    failed 9
    skipped 0
    warnings 0

  This duplicated event was generated with operations on files with
  "fake" path.

  == Fix ==
  * d9899030 (ovl: do not generate duplicate fsnotify events for "fake" path)

  This patch can be cherry-picked into Disco.

  Older kernels are not affected by this issue (without commit d1d04ef8)

  == Test ==
  Test kernel could be found here:
  https://people.canonical.com/~phlin/kernel/lp-1833028-fanotify06-ovl/

  Verified on a KVM node, the fanotify06 test will pass with this patched
  disco kernel:
   fanotify06.c:169: INFO: Test #1: Fanotify merge overlayfs mount mark
   fanotify06.c:147: PASS: group 0 got event: mask 2 pid=5997 fd=30
   fanotify06.c:147: PASS: group 1 got event: mask 2 pid=5997 fd=30
   fanotify06.c:147: PASS: group 2 got event: mask 2 pid=5997 fd=30
   fanotify06.c:230: PASS: group 3 got no event
   fanotify06.c:230: PASS: group 4 got no event
   fanotify06.c:230: PASS: group 5 got no event
   fanotify06.c:230: PASS: group 6 got no event
   fanotify06.c:230: PASS: group 7 got no event
   fanotify06.c:230: PASS: group 8 got no event

  == Regression Potential ==
  Low, fix limited to the overlayfs and just corrects the flag behaviour
  with "fake" path.


  ProblemType: Bug
  DistroRelease: Ubuntu 19.04
  Package: linux-image-5.0.0-16-generic 5.0.0-16.17
  ProcVersionSignature: User Name 5.0.0-16.17-generic 5.0.8
  Uname: Linux 5.0.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Jun 17 04:37 seq
   crw-rw---- 1 root audio 116, 33 Jun 17 04:37 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.10-0ubuntu27
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CurrentDmesg:

  Date: Mon Jun 17 04:40:18 2019
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
  PciMultimedia:

  ProcFB: 0 cirrusdrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.0.0-16-generic root=UUID=2a4b0342-a2dd-4feb-b3e2-9644ca1c4a60 ro
  RelatedPackageVersions:
   linux-restricted-modules-5.0.0-16-generic N/A
   linux-backports-modules-5.0.0-16-generic  N/A
   linux-firmware                            1.178.1
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/01/2014
  dmi.bios.vendor: SeaBIOS
  dmi.bios.version: Ubuntu-1.8.2-1ubuntu1
  dmi.chassis.type: 1
  dmi.chassis.vendor: QEMU
  dmi.chassis.version: pc-i440fx-xenial
  dmi.modalias: dmi:bvnSeaBIOS:bvrUbuntu-1.8.2-1ubuntu1:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-xenial:cvnQEMU:ct1:cvrpc-i440fx-xenial:
  dmi.product.name: Standard PC (i440FX + PIIX, 1996)
  dmi.product.version: pc-i440fx-xenial
  dmi.sys.vendor: QEMU

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