Comment 0 for bug 1773162

Upgrading from 16.04 to 18.04 on a IBM S822LC the system does not boot with 4.15.0-22-generic and is in a reboot cycle.

```
Exiting petitboot. Type 'exit' to return.
The system is going down NOW!
Sent SIGTERM to all processes
Sent SIGKILL to all processes
[31775213631,3] OPAL: Trying a CPU re-init with flags: 0x1
[32097001879,3] OPAL: Trying a CPU re-init with flags: 0x2
[ 2.660186] Bad kernel stack pointer 7fffcd511100 at c00000000000b9ec
[ 2.660382] Oops: Bad kernel stack pointer, sig: 6 [#1]
[ 2.660422] LE SMP NR_CPUS=2048 NUMA PowerNV
[ 2.660462] Modules linked in:
[ 2.660494] CPU: 63 PID: 1201 Comm: modprobe Not tainted 4.15.0-22-generic #24-Ubuntu
[ 2.660549] NIP: c00000000000b9ec LR: 0000000000000000 CTR: 0000000000000000
[ 2.660603] REGS: c00000003fd0bd40 TRAP: 0300 Not tainted (4.15.0-22-generic)
[ 2.660657] MSR: 9000000000001031 <SF,HV,ME,IR,DR,LE> CR: 00000000 XER: 00000000
[ 2.660713] CFAR: c00000000000b934 DAR: 00000000000200f0 DSISR: 40000000 SOFTE: -4611686018408771536
[ 2.660713] GPR00: 0000000000000000 00007fffcd511100 0000000000000000 0000000000000000
[ 2.660713] GPR04: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[ 2.660713] GPR08: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[ 2.660713] GPR12: 000075501b231700 00000000000200f0 0000000000000000 0000000000000000
[ 2.660713] GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[ 2.660713] GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[ 2.660713] GPR24: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[ 2.660713] GPR28: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[ 2.661203] NIP [c00000000000b9ec] fast_exception_return+0x9c/0x184
[ 2.661249] LR [0000000000000000] (null)
[ 2.661285] Call Trace:
[ 2.661303] Instruction dump:
[ 2.661331] e84101a0 7c4ff120 e8410170 7c5a03a6 e8010070 e8410080 e8610088 e8810090
[ 2.661387] e8210078 7db243a6 7db142a6 7c0004ac <e9ad0000> 63ff0000 7db242a6 48000010
[ 2.661445] ---[ end trace b607b09fe6490607 ]---
[…]
```

Please find the full log attached. Selecting Linux 4.4.0-124-generic works.

```
$ uname -a
Linux flughafenberlinbrandenburgwillybrandt 4.4.0-124-generic #148-Ubuntu SMP Wed May 2 13:02:22 UTC 2018 ppc64le ppc64le ppc64le GNU/Linux
$ dpkg -l linux-image-4.15.0-22-generic
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-==================================================-==============================-==============================-=========================================================================================================
ii linux-image-4.15.0-22-generic 4.15.0-22.24 ppc64el Signed kernel image generic
$ more /etc/os-release
NAME="Ubuntu"
VERSION="18.04 LTS (Bionic Beaver)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 18.04 LTS"
VERSION_ID="18.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=bionic
UBUNTU_CODENAME=bionic
```