[Bug 1847806] Re: eoan: ppc64el install on pseries-eoan VM fails to install

[Christian Ehrhardt ]

Step #1 - repro:
Repro the case as is - running ppc64el install in TCG on Eoan with all settings on default.
The system reports (proc/cpuinfo) POWER9 2.0 pvr 004e 1200 (just as expected).
And I have a bunch of illegal instructions hitting 4 binaries but essentially always being in libc2.30.so.

But I can run e.g. find in a shell without hitting that illegal instruction "again".
Something yet unknown is needed to hit these illegal instructions.
Maybe something special about the install environment that I haven't considered yet.


Step #2 - use old cpu type (p8 instead of p9)
By setting the pseries-disco machine type we know (see above) that we will get the formerly used "power8_v2.0" cpu type.
Running the Eoan iso install with that seems to work fine for me!


Step #3 - use old image (Disco instead of Eoan)
It is worth to check if this might be something "new" in Eoans glibc that triggers this or if more likely the switch of the emulated power8->power9 chip causes this. Therefore I ran a Disco ISO install in TCG with the defaulr (power9) cpu.
The install of that works fine as well.

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Title:
  eoan: ppc64el install on pseries-eoan VM fails to install

Status in The Ubuntu-power-systems project:
  Incomplete
Status in debian-installer package in Ubuntu:
  Invalid
Status in glibc package in Ubuntu:
  New
Status in qemu package in Ubuntu:
  Confirmed

Bug description:
  Using today's ppc64el server iso, I tried to install this on a
  pseries-eoan VM hosted on a large x86 desktop server and it failed to
  install.

  VM: 2GB memory, 20GB virtio qcow, CPUs: 2

  Installer options:
  Language: English
  Location: United Kingdom
  Detect keyboard layout? No
  Keyboard: English (UK)
  Keyboard Layout: English (UK)
  Hostname: ubuntu
  Full name for the new user: cking
  Username for your account: cking
  Choose a password for the new user: ************
  Re-enter password to verify: ************
  Partitioning method: Guided - use entire disk
  Select disk to partition: Virtual disk 1 (vda) - 21.5 GB Virtio Block Device
  Write the changes to discs? Yes

  Then installer stopped and I cannot progress. See the attached photo
  of the failure.

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