Since it was reported to have worked with former builds in Ubuntu I was
testing the former builds that were published in Hirsute.

https://launchpad.net/ubuntu/+source/qemu/1:5.2+dfsg-9ubuntu2 - failing
https://launchpad.net/ubuntu/+source/qemu/1:5.2+dfsg-9ubuntu1 - failing
https://launchpad.net/ubuntu/+source/qemu/1:5.2+dfsg-3ubuntu1 - working
https://launchpad.net/ubuntu/+source/qemu/1:5.1+dfsg-4ubuntu3 - working
I have also had prepped 1:5.0-5ubuntu11 but didn't go further after above 
results.

This absolutely confirms your initial report (changed in recent version) and 
gladly leaves us much less to churn through.
OTOH the remaining changes that could be related are mostly CVEs which are most 
of the time not very debatable.1

That was a rebase without changes in Ubuntu, but picking up Debian changes 
between
1:5.2+dfsg-3 -> 1:5.2+dfsg-9.

Those are:
- virtiofsd changes - not used here
- package dependency changes - not relevant here
- deprecate qemu-debootstrap - not used here
- security fixes
  - arm_gic-fix-interrupt-ID-in-GICD_SGIR-CVE-2021-20221.patch - not used (arm 
virt)
  - 9pfs-Fully-restart-unreclaim-loop-CVE-2021-20181.patch - not used (9pfs)
  - CVE-2021-20263 - again virtiofsd (not used)
  - CVE-2021-20257 - network for e1000 (not related to the error and nic none 
works)
  - I'll still unapply these for a test just to be sure
- there also is the chance that this is due to libs/build-toolchain - I'll 
rebuild a former working version for a re-test

I was trying to to further limit the scope but here things got a bit
crazy:

- 1:5.2+dfsg-9ubuntu1 - tried 3 more times as-is - 2 failed 1 worked
So it isn't 100% reproducible :-/

This made me re-recheck the older builds (maybe some race window got
bigger/smaller).

Then I had 3 more tries with "-nic none"
All three failed - so it is unlikely the e1000 fix that could have crept in via 
a default config.

I have created two PPAs which just started to build:
https://launchpad.net/~paelzer/+archive/ubuntu/lp-1921664-testbuilds-secrevertpatches
https://launchpad.net/~paelzer/+archive/ubuntu/lp-1921664-testbuilds-rebuildold


Once these are complete I can further chase this down ...

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2021-20181

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2021-20221

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2021-20257

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2021-20263

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https://bugs.launchpad.net/bugs/1921664

Title:
  Recent update broke qemu-system-riscv64

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