> Maybe it depends on what arm platform (as there are often subtle differences) 
> or which storage (as > the assert is about storage) you run on.
> My CPU is an X-Gene and my Storage is a ZFS (that backs my container running 
> hirsute and Hirsute's > qemu).
> What is it for you?

Sorry, I thought I had already reported that, but it's not clear. My setup is 
special in a couple of ways:
- I'm running Ubuntu/Arm64 (21.04 beta, fully up-to-date except kernel), but ...
- it's a virtual machine on a macOS/Mac Mini M1 (fully up-to-date)
- It's running the 5.8.0-36-generic which isn't the latest (for complicated 
reasons)

I'll try to bring my Raspberry Pi 4 back up on Ubuntu and see if I can
reproduce it there.


> Is this failing 100% of the times for you, or just sometimes and maybe racy?

100% consistently reproducible with the official packages.  0%
reproducible with my own build


> A hint which versions to look at can be derived from
> $ grep -- qemu-system-misc /var/log/dpkg.log

Alas, I had critical space issues and /var/log was among the casualties


> Could you rebuild what you get with "apt source qemu". That will be 5.2 plus 
> the Delta we have...

TIL.  I tried `apt source --compile qemu` but it complains

  dpkg-checkbuilddeps: error: Unmet build dependencies: gcc-alpha-linux-
gnu gcc-powerpc64-linux-gnu

but these packages are not available [anymore?].  I don't currently have
the time to figure this out.


> FYI my qemu is still busy

It's hung.  The boot take ~ 20 seconds on my host.  Multi-minutes is not
normal.


If I can reproduce this on a Raspberry Pi 4, then I'll proceed with your 
suggestions above, otherwise I'll pause this until I can run Ubuntu natively on 
the Mac Mini.

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

Title:
  Recent update broke qemu-system-riscv64

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