Public bug reported:

This issue is a bit strange.

The test has passed with Cosmic 4.18.0-18.19 generic kernel on AMD64
node during our SRU testing process.

https://pastebin.ubuntu.com/p/HN2vN6fCXn/

However, Tyler found that this test will hang after:
[30] Kretprobe dynamic event with maxactive     [PASS]
[31] Register/unregister many kprobe events     [PASS]

And this is 100% reproducible.

No relevant output in syslog.

This will need further investigation.

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: linux-image-4.18.0-18-generic 4.18.0-18.19
ProcVersionSignature: User Name 4.18.0-18.19-generic 4.18.20
Uname: Linux 4.18.0-18-generic x86_64
AlsaDevices:
 total 0
 crw-rw---- 1 root audio 116,  1 Apr 25 07:16 seq
 crw-rw---- 1 root audio 116, 33 Apr 25 07:16 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:
Date: Thu Apr 25 07:18:51 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-4.18.0-18-generic 
root=UUID=2f68c627-8ab4-40d5-8c06-6563436d0f96 ro
RelatedPackageVersions:
 linux-restricted-modules-4.18.0-18-generic N/A
 linux-backports-modules-4.18.0-18-generic  N/A
 linux-firmware                             1.175.3
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

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

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug cosmic uec-images

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

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1826385

Title:
  ftrace in ubuntu_kernel_selftests hang with Cosmic kernel

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

Bug description:
  This issue is a bit strange.

  The test has passed with Cosmic 4.18.0-18.19 generic kernel on AMD64
  node during our SRU testing process.

  https://pastebin.ubuntu.com/p/HN2vN6fCXn/

  However, Tyler found that this test will hang after:
  [30] Kretprobe dynamic event with maxactive   [PASS]
  [31] Register/unregister many kprobe events   [PASS]

  And this is 100% reproducible.

  No relevant output in syslog.

  This will need further investigation.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: linux-image-4.18.0-18-generic 4.18.0-18.19
  ProcVersionSignature: User Name 4.18.0-18.19-generic 4.18.20
  Uname: Linux 4.18.0-18-generic x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Apr 25 07:16 seq
   crw-rw---- 1 root audio 116, 33 Apr 25 07:16 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:
  Date: Thu Apr 25 07:18:51 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-4.18.0-18-generic 
root=UUID=2f68c627-8ab4-40d5-8c06-6563436d0f96 ro
  RelatedPackageVersions:
   linux-restricted-modules-4.18.0-18-generic N/A
   linux-backports-modules-4.18.0-18-generic  N/A
   linux-firmware                             1.175.3
  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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