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qemu s390x on focal - applications breaking

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.