This looks a lot like
https://mail.gnu.org/archive/html/qemu-devel/2020-09/msg00212.html

You'd think the offending commit mentioned there is actually in 5.1 and not 
earlier.
But it is backported in Groovy as part of
  Bug-Debian: https://bugs.debian.org/964793                                    
   
  Bug-Debian: https://bugs.debian.org/964247
  https://bugs.launchpad.net/qemu/+bug/1886318
It already had one follow on fix in
  d/p/riscv-allow-64-bit-access-to-SiFive-CLINT.patch

Focal has that as well via CVE fixes:
  d/p/ubuntu/hw-riscv-Allow-64-bit-access-to-SiFive-CLINT.patch
  debian/patches/ubuntu/CVE-2020-13754-1.patch

Chances are we need this later follow on fix as well.

I wanted to check for Focal for stable patches of 4.2 (qemu-
[email protected]) anyway (but there is not 4.2.2 yet). This would be
one of them, but one step at a time.

I guess we need to backport
https://git.qemu.org/?p=qemu.git;a=commit;h=ab3d207fe89bc0c63739db19e177af49179aa457

@Sean - if I'd build you qemu with that fix could you test it? If so
what would you need qemu for F&G ?

** Bug watch added: Debian Bug tracker #964793
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=964793

** Bug watch added: Debian Bug tracker #964247
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=964247

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2020-13754

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Title:
  qemu-system-riscv64 sbi_trap_error powering down VM riscv64

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