reproducing in a porterbox ...

with qemu 1:10.0.2+ds-1ubuntu2

$ PYTHONPATH=./debian/python python3 debian/tests/shell.py
...
Ran 25 tests in 16.891s


with qemu 1:10.1.0~rc2+ds-1ubuntu1

$ PYTHONPATH=./debian/python python3 debian/tests/shell.py
...
(hangs as in the autopkgtest)

(remember this only fails on armhf, all other host platforms work fine)


Isolating the failing commands like

/usr/bin/qemu-system-i386 -machine q35,accel=tcg -no-user-config
-nodefaults -m 256 -smp 1,sockets=1,cores=1,threads=1 -display none
-serial stdio -chardev pty,id=charserial1 -device isa-
serial,chardev=charserial1,id=serial1 -drive
file=/usr/share/OVMF/OVMF32_CODE_4M.fd,if=pflash,format=raw,unit=0,readonly=on
-drive file=/tmp/tmp0b6qq28g,if=pflash,format=raw,unit=1,readonly=off


Only difference is the machine type q35 vs pc and different tmp files to boot 
into.
By the above we know it is excuting/emulating i386 code in all cases.

Not sure if needed, but saving one of these tmp files to recreate it
without the wrapper ...

The q35 case seems to be a bit more intense to the system grinding much
to a halt.

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https://bugs.launchpad.net/bugs/2121495

Title:
  edk2 test on armhf breaks with qemu 10.1 in questing

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