** Tags removed: sru-20200217
** Tags added: kqa-blocker

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https://bugs.launchpad.net/bugs/1867155

Title:
  P8 node modoc will reboot automatically when running the sru_misc test
  suite

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

Bug description:
  Tested with 5 attempts, 4 hangs around the following test in 
ubuntu_kernel_selftests net sub-category:
   # selftests: net: reuseport_bpf_cpu

  First attempt:
  23:21:32 DEBUG| [stdout] ok 2 selftests: net: reuseport_bpf_cpu
  23:21:32 DEBUG| [stdout] # selftests: net: reuseport_bpf_numa
  23:21:32 DEBUG| [stdout] # ---- IPv4 UDP ----
  (hang here)

  Second attempt:
  10:17:35 DEBUG| [stdout] ok 1 selftests: net: reuseport_bpf
  10:17:35 DEBUG| [stdout] # selftests: net: reuseport_bpf_cpu
  10:17:35 DEBUG| [stdout] # ---- IPv4 UDP ----
  10:17:35 DEBUG| [stdout] # send cpu 0, receive socket 0
  (line skipped)
  10:17:35 DEBUG| [stdout] # send cpu 159, receive socket 159
  10:17:35 DEBUG| [stdout] # ---- IPv6 TCP ----
  (hang here)

  Third attempt failed because of test timeout:
  12:46:16 DEBUG| [stdout] # [FAIL]
  12:46:16 DEBUG| [stdout] # --------------------
  12:46:16 DEBUG| [stdout] # running psock_tpacket test
  12:46:16 DEBUG| [stdout] # --------------------
  13:14:13 INFO | Timer expired (1800 sec.), nuking pid 161853

  Fourth attempt:
  07:41:51 DEBUG| [stdout] # selftests: net: reuseport_bpf_cpu
  07:41:51 DEBUG| [stdout] # ---- IPv4 UDP ----
  07:41:51 DEBUG| [stdout] # send cpu 0, receive socket 0
  (lines skipped)
  07:41:51 DEBUG| [stdout] # send cpu 159, receive socket 159
  07:41:51 DEBUG| [stdout] # ---- IPv6 UDP ----
  07:41:51 DEBUG| [stdout] # send cpu 0, receive socket 0
  07:41:51 DEBUG| [stdout] # send cpu 1, receive socket 1
  (lines skipped)
  07:41:51 DEBUG| [stdout] # send cpu 157, receive socket 157
  07:41:51 DEBUG| [stdout] # send cpu 159, receive socket 159
  07:41:51 DEBUG| [stdout] # ---- IPv4 TCP ----
  (test hang here)

  Fifth attempt:
  04:29:17 DEBUG| [stdout] ok 1 selftests: net: reuseport_bpf
  04:29:17 DEBUG| [stdout] # selftests: net: reuseport_bpf_cpu
  04:29:17 DEBUG| [stdout] # ---- IPv4 UDP ----
  04:29:17 DEBUG| [stdout] # send cpu 0, receive socket 0
  (lines skipped)
  04:29:17 DEBUG| [stdout] # send cpu 159, receive socket 159
  04:29:17 DEBUG| [stdout] # ---- IPv6 UDP ----
  04:29:17 DEBUG| [stdout] # send cpu 0, receive socket 0
  (lines skipped)
  04:29:17 DEBUG| [stdout] # send cpu 159, receive socket 159
  04:29:17 DEBUG| [stdout] # ---- IPv4 TCP ----
  04:29:17 DEBUG| [stdout] # send cpu 0, receive socket 0
  (lines skipped)
  04:29:17 DEBUG| [stdout] # send cpu 15, receive socket 15
  (test hang here)

  I tried to run tests in this sru-misc suite in the following order:
          'hwclock',
          'ubuntu_bpf',
          'ubuntu_bpf_jit',
          'ubuntu_kernel_selftests',
          'ubuntu_lxc',
          'ubuntu_seccomp',
          'ubuntu_unionmount_ovlfs',
          'ubuntu_cts_kernel',
          'ubuntu_kvm_unit_tests',
  One by one on this node, but I can't reproduce this issue.

  I tried to watch dmesg when this happens, but there is no information
  there, the system will be reboot automatically silently.

  Maybe we need to use IPMI to see if there is anything on the console.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: linux-image-5.3.0-42-generic 5.3.0-42.34
  ProcVersionSignature: Ubuntu 5.3.0-42.34-generic 5.3.18
  Uname: Linux 5.3.0-42-generic ppc64le
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Mar 12 04:33 seq
   crw-rw---- 1 root audio 116, 33 Mar 12 04:33 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.11-0ubuntu8.5
  Architecture: ppc64el
  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 Mar 12 09:42:24 2020
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb:
   Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  PciMultimedia:

  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=C.UTF-8
   SHELL=/bin/bash
  ProcFB:

  ProcKernelCmdLine: root=UUID=b2a867ce-7813-4785-8861-4e7de2ac39b4 ro 
console=hvc0
  ProcLoadAvg: 0.07 0.02 0.00 1/1461 86637
  ProcLocks:
   1: POSIX  ADVISORY  WRITE 3799 00:18:841 0 EOF
   2: POSIX  ADVISORY  WRITE 3526 00:18:743 0 EOF
   3: FLOCK  ADVISORY  WRITE 3720 00:18:837 0 EOF
  ProcSwaps:
   Filename                             Type            Size    Used    Priority
   /swap.img                               file         8388544 0       -2
  ProcVersion: Linux version 5.3.0-42-generic (buildd@bos02-ppc64el-006) (gcc 
version 9.2.1 20191008 (Ubuntu 9.2.1-9ubuntu2)) #34-Ubuntu SMP Fri Feb 28 
05:49:17 UTC 2020
  RelatedPackageVersions:
   linux-restricted-modules-5.3.0-42-generic N/A
   linux-backports-modules-5.3.0-42-generic  N/A
   linux-firmware                            1.183.4
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  VarLogDump_list: total 0
  cpu_cores: Number of cores present = 20
  cpu_coreson: Number of cores online = 20
  cpu_dscr: DSCR is 0
  cpu_freq:
   min: 3.694 GHz (cpu 159)
   max: 3.695 GHz (cpu 1)
   avg: 3.694 GHz
  cpu_runmode:
   Could not retrieve current diagnostics mode,
   No kernel interface to firmware
  cpu_smt: SMT=8

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