This works with ARM64 ThunderX node "starmie" on 18.04 with 4.15 kernel

It looks like since 4.18 kernel, this SyS_write has been changed into
ksys_write

Test result from 5.0.0 ARM64 ThunderX node "wright"
# grep ksys_write ftrace.log |grep dd | tail
              dd-1389  [002] ....   801.332505: vfs_write <-ksys_write
              dd-1389  [002] ....   801.333108: ksys_write <-__arm64_sys_write
              dd-1389  [002] ....   801.333108: __fdget_pos <-ksys_write
              dd-1389  [002] ....   801.333109: vfs_write <-ksys_write
              dd-1389  [002] ....   801.333154: ksys_write <-__arm64_sys_write
              dd-1389  [002] ....   801.333154: __fdget_pos <-ksys_write
              dd-1389  [002] ....   801.333155: vfs_write <-ksys_write
              dd-1389  [002] ....   801.333162: ksys_write <-__arm64_sys_write
              dd-1389  [002] ....   801.333162: __fdget_pos <-ksys_write
              dd-1389  [002] ....   801.333163: vfs_write <-ksys_write
# uname -a
Linux ms10-34-mcdivittB0-kernel 5.0.0-7-generic #8-Ubuntu SMP Mon Mar 4 
16:27:27 UTC 2019 aarch64 aarch64 aarch64 GNU/Linux

Test result from 4.18.0 AMD64 node "onibi":
# grep ksys_write ftrace.log  | grep dd | tail
              dd-2036  [001] ....   325.866508: vfs_write <-ksys_write
              dd-2036  [001] ....   325.866722: ksys_write <-__x64_sys_write
              dd-2036  [001] ....   325.866722: __fdget_pos <-ksys_write
              dd-2036  [001] ....   325.866722: vfs_write <-ksys_write
              dd-2036  [001] ....   325.866747: ksys_write <-__x64_sys_write
              dd-2036  [001] ....   325.866747: __fdget_pos <-ksys_write
              dd-2036  [001] ....   325.866747: vfs_write <-ksys_write
              dd-2036  [001] ....   325.866750: ksys_write <-__x64_sys_write
              dd-2036  [001] ....   325.866750: __fdget_pos <-ksys_write
              dd-2036  [001] ....   325.866750: vfs_write <-ksys_write
# uname -a
Linux onibi 4.18.0-16-generic #17-Ubuntu SMP Fri Feb 8 00:06:57 UTC 2019 x86_64 
x86_64 x86_64 GNU/Linux


** Also affects: linux (Ubuntu Disco)
   Importance: Undecided
       Status: Incomplete

** Also affects: linux (Ubuntu Cosmic)
   Importance: Undecided
       Status: New

** Also affects: ubuntu-kernel-tests
   Importance: Undecided
       Status: New

** No longer affects: linux (Ubuntu)

** No longer affects: linux (Ubuntu Cosmic)

** No longer affects: linux (Ubuntu Disco)

** Tags added: disco

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https://bugs.launchpad.net/bugs/1818612

Title:
  ubuntu_ftrace_smoke_test failed with 0 SyS_write traces found

Status in ubuntu-kernel-tests:
  New

Bug description:
  ubuntu_ftrace_smoke_test failed on AMD64 / ARM64

    PASSED (CONFIG_FUNCTION_TRACER=y in /boot/config-4.18.0-15-generic)
    PASSED (CONFIG_FUNCTION_GRAPH_TRACER=y in /boot/config-4.18.0-15-generic)
    PASSED (CONFIG_STACK_TRACER=y in /boot/config-4.18.0-15-generic)
    PASSED (CONFIG_DYNAMIC_FTRACE=y in /boot/config-4.18.0-15-generic)
    PASSED all expected /sys/kernel/debug/tracing files exist
    PASSED (function_graph in /sys/kernel/debug/tracing/available_tracers)
    PASSED (function in /sys/kernel/debug/tracing/available_tracers)
    PASSED (nop in /sys/kernel/debug/tracing/available_tracers)
    PASSED (function can be enabled)
    FAILED (SyS_write traces found must be > 32, got 0)
    PASSED (function_graph can be enabled)
    PASSED (vfs_write traces found must be > 32, got 181)
    PASSED (tracer hwlat can be enabled (got 9 lines of tracing output))
    PASSED (tracer blk can be enabled (got 2 lines of tracing output))
    PASSED (tracer mmiotrace can be enabled (got 9 lines of tracing output))
    PASSED (tracer function_graph can be enabled (got 107012 lines of tracing 
output))
    PASSED (tracer wakeup_dl can be enabled (got 2 lines of tracing output))
    PASSED (tracer wakeup_rt can be enabled (got 47 lines of tracing output))
    PASSED (tracer wakeup can be enabled (got 2 lines of tracing output))
    PASSED (tracer function can be enabled (got 102228 lines of tracing output))
    TIMEOUT 13299
    KILLING 13299
    FAILED: aborting, timeout, took way too long to complete

  END ERROR       ubuntu_ftrace_smoke_test.ftrace-smoke-test
  ubuntu_ftrace_smoke_test.ftrace-smoke-test      timestamp=1551758051
  localtime=Mar 05 03:54:11

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: linux-image-4.18.0-15-generic 4.18.0-15.16
  ProcVersionSignature: User Name 4.18.0-15.16-generic 4.18.20
  Uname: Linux 4.18.0-15-generic x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Mar  4 04:44 seq
   crw-rw---- 1 root audio 116, 33 Mar  4 04:44 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.10-0ubuntu13.2
  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: Tue Mar  5 03:54:43 2019
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  MachineType: Dell Inc. PowerEdge R310
  PciMultimedia:
   
  ProcFB: 0 mgadrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-15-generic 
root=UUID=ded56b2d-3057-4d58-a1e5-422853291ffd ro console=ttyS0,1152008n1
  RelatedPackageVersions:
   linux-restricted-modules-4.18.0-15-generic N/A
   linux-backports-modules-4.18.0-15-generic  N/A
   linux-firmware                             1.175.1
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/17/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.8.2
  dmi.board.name: 05XKKK
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A05
  dmi.chassis.type: 23
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.8.2:bd08/17/2011:svnDellInc.:pnPowerEdgeR310:pvr:rvnDellInc.:rn05XKKK:rvrA05:cvnDellInc.:ct23:cvr:
  dmi.product.name: PowerEdge R310
  dmi.sys.vendor: Dell Inc.

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