I managed to catch this issue with IPMI console:

[  673.975988] BUG: Unable to handle kernel instruction fetch
[  673.976017] Faulting instruction address: 0x7fe000087fe00008
[  673.976025] Oops: Kernel access of bad area, sig: 11 [#1]
[  673.976032] LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA PowerNV
[  673.976040] Modules linked in: binfmt_misc dm_multipath scsi_dh_rdac 
scsi_dh_emc scsi_dh_alua leds_powernv ipmi_powernv ipmi_devintf ipmi_msghandler 
ibmpowernv uio_pdrv_genirq vmx_crypto uio powernv_rng powernv_op_panel 
sch_fq_codel ip_tables x_tables autofs4 ses enclosure scsi_transport_sas btrfs 
zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor 
async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear crct10dif_vpmsum 
crc32c_vpmsum tg3 ipr [last unloaded: notifier_error_inject]
[  673.976101] CPU: 0 PID: 76667 Comm: reuseport_bpf_c Not tainted 
5.3.0-42-generic #34-Ubuntu
[  673.976109] NIP:  7fe000087fe00008 LR: c000000000ca9d10 CTR: 7fe000087fe00008
[  673.976117] REGS: c000000ffffcf580 TRAP: 0480   Not tainted  
(5.3.0-42-generic)
[  673.976124] MSR:  9000000000009033 <SF,HV,EE,ME,IR,DR,RI,LE>  CR: 24002488  
XER: 20000000
[  673.976135] CFAR: c000000000ca9d0c IRQMASK: 0 
[  673.976135] GPR00: c000000000e4094c c000000ffffcf810 c0000000019c9000 
c000000a2208b6e0 
[  673.976135] GPR04: c008000007c70038 c000000a2208b6e0 0000000000000028 
000000012e2e5506 
[  673.976135] GPR08: 00000000a2be9417 0000000000000000 0000000000000000 
0000000000000000 
[  673.976135] GPR12: 7fe000087fe00008 c000000001d60000 0000000000000003 
0000000000000101 
[  673.976135] GPR16: c000000003fe00e8 00000000000022b8 0000000000002788 
c0000000018fb600 
[  673.976135] GPR20: 000000000000000a 0000000000000000 00000000000022b8 
0000000000000001 
[  673.976135] GPR24: 0000000000000000 0000000000000028 00000000000000a0 
c000000003fe00e8 
[  673.976135] GPR28: c008000007c70000 00000000147b1819 c000000a2208b6e0 
c000001e2d8b0000 
[  673.976195] NIP [7fe000087fe00008] 0x7fe000087fe00008
[  673.976206] LR [c000000000ca9d10] reuseport_select_sock+0x100/0x400
[  673.976212] Call Trace:
[  673.976216] [c000000ffffcf810] [c000000fe9daf0f0] 0xc000000fe9daf0f0 
(unreliable)
[  673.976226] [c000000ffffcf8b0] [c000000000e4094c] 
inet6_lhash2_lookup+0x1ec/0x220
[  673.976234] [c000000ffffcf930] [c000000000e40c80] 
inet6_lookup_listener+0x300/0x3f0
[  673.976244] [c000000ffffcf9d0] [c000000000e1ec38] tcp_v6_rcv+0x7d8/0xe10
[  673.976252] [c000000ffffcfb00] [c000000000dd7e70] 
ip6_protocol_deliver_rcu+0x110/0x6e0
[  673.976261] [c000000ffffcfb80] [c000000000dd846c] ip6_input_finish+0x2c/0x40
[  673.976269] [c000000ffffcfba0] [c000000000dd8560] ip6_input+0xe0/0xf0
[  673.976276] [c000000ffffcfc10] [c000000000dd7008] ip6_rcv_finish+0xa8/0xe0
[  673.976283] [c000000ffffcfc40] [c000000000dd7b90] ipv6_rcv+0x100/0x110
[  673.976291] [c000000ffffcfcc0] [c000000000c6d040] 
__netif_receive_skb_one_core+0x70/0xb0
[  673.976299] [c000000ffffcfd00] [c000000000c6ee70] process_backlog+0xd0/0x230
[  673.976307] [c000000ffffcfd70] [c000000000c6db88] net_rx_action+0x1e8/0x510
[  673.976315] [c000000ffffcfe90] [c000000000e9c8a0] __do_softirq+0x160/0x3f4
[  673.976324] [c000000ffffcff90] [c000000000030be8] call_do_softirq+0x14/0x24
[  673.976332] [c000000004a4f6b0] [c00000000001c2e8] 
do_softirq_own_stack+0x38/0x50
[  673.976341] [c000000004a4f6d0] [c0000000001315a0] do_softirq.part.0+0x80/0xb0
[  673.976349] [c000000004a4f700] [c000000000131698] 
__local_bh_enable_ip+0xc8/0xf0
[  673.976357] [c000000004a4f720] [c000000000dd19b8] 
ip6_finish_output2+0x298/0x790
[  673.976365] [c000000004a4f7c0] [c000000000dd6124] ip6_output+0x84/0x1c0
[  673.976372] [c000000004a4f840] [c000000000dd222c] ip6_xmit+0x37c/0x7b0
[  673.976379] [c000000004a4f960] [c000000000e272e4] inet6_csk_xmit+0xb4/0x120
[  673.976387] [c000000004a4fa00] [c000000000d4231c] 
__tcp_transmit_skb+0x55c/0xd80
[  673.976396] [c000000004a4fab0] [c000000000d43a18] tcp_connect+0x918/0xab0
[  673.976403] [c000000004a4fb70] [c000000000e1c25c] tcp_v6_connect+0x5ac/0x740
[  673.976411] [c000000004a4fc50] [c000000000d7271c] 
__inet_stream_connect+0x12c/0x4b0
[  673.976419] [c000000004a4fcf0] [c000000000d72afc] 
inet_stream_connect+0x5c/0x90
[  673.976428] [c000000004a4fd30] [c000000000c37a0c] __sys_connect+0x11c/0x160
[  673.976435] [c000000004a4fe00] [c000000000c37a78] sys_connect+0x28/0x40
[  673.976443] [c000000004a4fe20] [c00000000000b388] system_call+0x5c/0x70
[  673.976449] Instruction dump:
[  673.976454] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX 
XXXXXXXX 
[  673.976462] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX 
XXXXXXXX 
[  673.976472] ---[ end trace 0961698a90363364 ]---
[  673.976948] 
[  674.977035] Kernel panic - not syncing: Aiee, killing interrupt handler!
[  674.978187] Rebooting in 10 seconds..

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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:
  Triaged
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.

  This is what you can see from syslog after reboot:
  Mar 12 04:27:39 modoc kernel: [  536.668305] Injecting error (-12) to 
MEM_GOING_OFFLINE
  Mar 12 04:27:39 modoc kernel: [  536.684547] Injecting error (-12) to 
MEM_GOING_OFFLINE
  Mar 12 04:27:39 modoc kernel: [  536.700907] Injecting error (-12) to 
MEM_GOING_OFFLINE
  Mar 12 04:27:39 modoc kernel: [  536.717246] Injecting error (-12) to 
MEM_GOING_OFFLINE
  Mar 12 04:27:39 modoc kernel: [  536.719288] page:c00c000000c4f000 refcount:1 
mapcount:0 mapping:c000000f8cfe0fd1 index:0x7611c3e
  Mar 12 04:27:39 modoc kernel: [  536.719289] anon
  Mar 12 04:27:39 modoc kernel: [  536.719291] flags: 
0x3ffff800080024(uptodate|active|swapbacked)
  Mar 12 04:27:39 modoc kernel: [  536.719294] raw: 003ffff800080024 
5deadbeef0000100 5deadbeef0000122 c000000f8cfe0fd1
  Mar 12 04:27:39 modoc kernel: [  536.719295] raw: 0000000007611c3e 
0000000000000000 00000001ffffffff c000000fcfd1c000
  Mar 12 04:27:39 modoc kernel: [  536.719296] page dumped because: unmovable 
page
  Mar 12 04:27:39 modoc kernel: [  536.719296] page->mem_cgroup:c000000fcfd1c000
  Mar 12 04:27:39 modoc kernel: [  536.735465] Injecting error (-12) to 
MEM_GOING_OFFLINE
  Mar 12 04:27:39 modoc kernel: [  536.751848] Injecting error (-12) to 
MEM_GOING_OFFLINE
  Mar 12 04:27:39 modoc kernel: [  536.768210] Injecting error (-12) to 
MEM_GOING_OFFLINE
  Mar 12 04:27:39 modoc kernel: [  536.784450] Injecting error (-12) to 
MEM_GOING_OFFLINE
  Mar 12 04:27:39 modoc kernel: [  536.800756] Injecting error (-12) to 
MEM_GOING_OFFLINE
  Mar 12 04:27:39 modoc kernel: [  536.817006] Injecting error (-12) to 
MEM_GOING_OFFLINE
  Mar 12 04:27:39 modoc kernel: [  536.833133] Injecting error (-12) to 
MEM_GOING_OFFLINE
  Mar 12 04:27:39 modoc kernel: [  536.849205] Injecting error (-12) to 
MEM_GOING_OFFLINE
  Mar 12 04:27:39 modoc kernel: [  536.865448] Injecting error (-12) to 
MEM_GOING_OFFLINE
  
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@Mar
 12 04:35:41 modoc systemd[1]: Starting Flush Journal to Persistent Storage...
  Mar 12 04:35:41 modoc kernel: [    0.000000] hash-mmu: Page sizes from 
device-tree:
  Mar 12 04:35:41 modoc kernel: [    0.000000] hash-mmu: base_shift=12: 
shift=12, sllp=0x0000, avpnm=0x00000000, tlbiel=1, penc=0
  Mar 12 04:35:41 modoc kernel: [    0.000000] hash-mmu: base_shift=12: 
shift=16, sllp=0x0000, avpnm=0x00000000, tlbiel=1, penc=7
  Mar 12 04:35:41 modoc kernel: [    0.000000] hash-mmu: base_shift=12: 
shift=24, sllp=0x0000, avpnm=0x00000000, tlbiel=1, penc=56
  Mar 12 04:35:41 modoc systemd[1]: Started udev Kernel Device Manager.

  From the log above, line "^@^@^@^@^@^" indicates the reboot. It looks
  like it's running the memory-hotplug test.

  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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