[Bug 1852781] Re: qemu s390x on focal - applications breaking

[Colin Ian King]

ps is showing QEMU is running as follows:

/usr/bin/qemu-system-s390x -name guest=ubuntu20.04-focal-s390x,debug-
threads=on -S -object
secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-10-ubuntu20.04-focal-s3
/master-key.aes -machine s390-ccw-virtio-eoan,accel=tcg,usb=off,dump-
guest-core=off -m 2048 -overcommit mem-lock=off -smp
2,sockets=2,cores=1,threads=1 -uuid 6501dfbf-16d7-4412-a9d5-1ee808b42804
-display none -no-user-config -nodefaults -chardev
socket,id=charmonitor,fd=24,server,nowait -mon
chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown
-boot strict=on -device virtio-scsi-ccw,id=scsi0,devno=fe.0.0002 -device
virtio-serial-ccw,id=virtio-serial0,devno=fe.0.0003 -drive file=/pool-
ssd/virt/ubuntu19.10-eaon-s390x-clone,format=qcow2,if=none,id=drive-
virtio-disk0 -device virtio-blk-ccw,scsi=off,devno=fe.0.0000,drive
=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -drive if=none,id=drive-
scsi0-0-0-0,readonly=on -device scsi-cd,bus=scsi0.0,channel=0,scsi-
id=0,lun=0,device_id=drive-scsi0-0-0-0,drive=drive-
scsi0-0-0-0,id=scsi0-0-0-0 -netdev tap,fd=27,id=hostnet0 -device virtio-
net-ccw,netdev=hostnet0,id=net0,mac=52:54:00:a3:21:68,devno=fe.0.0001
-chardev socket,id=charchannel0,fd=28,server,nowait -device
virtserialport,bus=virtio-
serial0.0,nr=1,chardev=charchannel0,id=channel0,name=org.qemu.guest_agent.0
-chardev pty,id=charconsole0 -device
sclpconsole,chardev=charconsole0,id=console0 -device virtio-balloon-
ccw,id=balloon0,devno=fe.0.0004 -object rng-
random,id=objrng0,filename=/dev/urandom -device virtio-rng-
ccw,rng=objrng0,id=rng0,devno=fe.0.0005 -sandbox
on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny
-msg timestamp=on

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https://bugs.launchpad.net/bugs/1852781

Title:
  qemu s390x on focal - applications breaking

Status in QEMU:
  New

Bug description:
  Running qemu-system-s390x (1:4.0+dfsg-0ubuntu10) on an x86-64 Focal
  host with an upgrade of a Eoan s390x VM to a Focal s390x is triggering
  random breakage, for example:

  sudo apt-get update && sudo apt-get dist-upgrade

  ...
  ...

  Unpacking debianutils (4.9) over (4.8.6.3) ...
  Setting up debianutils (4.9) ...
  Use of uninitialized value $ARGV[0] in string ne at /usr/sbin/update-mime 
line 43.
  (Reading database ... 83640 files and directories currently installed.)
  Preparing to unpack .../bash_5.0-5ubuntu1_s390x.deb ...
  Unpacking bash (5.0-5ubuntu1) over (5.0-4ubuntu1) ...
  Setting up bash (5.0-5ubuntu1) ...
  [12124.788618] User process fault: interruption code 0007 ilc:3 in 
bash[2aa3d780000+149000]
  dpkg: error processing package bash (--configure):
   installed bash package post-installation script subprocess was killed by 
signal (Floating point exception), core du
  mped
  Errors were encountered while processing:
   bash
  E: Sub-process /usr/bin/dpkg returned an error code (1)

  And now bash is completely broken:

  cking@eoan-s390x:~$ bash
  [12676.204389] User process fault: interruption code 0007 ilc:3 in 
bash[2aa14780000+149000]

  Floating point exception (core dumped)

  The upgrade works OK on a s390x, so I'm assuming it's something to do
  with the qemu emulation.

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