bug#43500: qemu-minimal test suite crashes on armhf-linux

[Maxim Cournoyer]

Running the following commands on the current master branch (commit
679d5e6b3dcac4ee1f419c04b3719fead0bd9ee5):

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./pre-inst-env guix build qemu-minimal --rounds=5 --system=armhf-linux
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Produces the following error during the test suite:

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PASS 26 qos-test 
/arm/virt/virtio-mmio/virtio-bus/virtio-blk-device/virtio-blk/virtio-blk-tests/config
PASS 27 qos-test 
/arm/virt/virtio-mmio/virtio-bus/virtio-blk-device/virtio-blk/virtio-blk-tests/basic
PASS 28 qos-test 
/arm/virt/virtio-mmio/virtio-bus/virtio-blk-device/virtio-blk/virtio-blk-tests/resize
PASS 29 qos-test 
/arm/virt/virtio-mmio/virtio-bus/virtio-net-device/virtio-net/virtio-net-tests/basic
PASS 30 qos-test 
/arm/virt/virtio-mmio/virtio-bus/virtio-net-device/virtio-net/virtio-net-tests/rx_stop_cont
PASS 31 qos-test 
/arm/virt/virtio-mmio/virtio-bus/virtio-net-device/virtio-net/virtio-net-tests/announce-self
**
ERROR:tests/qtest/qos-test.c:175:subprocess_run_one_test: child process 
(/arm/virt/virtio-mmio/virtio-bus/virtio-net-device/virtio-net/virtio-net-tests/vhost-user/migrate/subprocess
 [28290]) failed unexpectedly
ERROR - Bail out! ERROR:tests/qtest/qos-test.c:175:subprocess_run_one_test: 
child process 
(/arm/virt/virtio-mmio/virtio-bus/virtio-net-device/virtio-net/virtio-net-tests/vhost-user/migrate/subprocess
 [28290]) failed unexpectedly
qemu: uncaught target signal 6 (Aborted) - core dumped
make: *** 
[/tmp/guix-build-qemu-minimal-5.0.0.drv-0/qemu-5.0.0/tests/Makefile.include:636:
 check-qtest-arm] Error 1

Test suite failed, dumping logs.
command "make" "check" "V=1" failed with status 2
builder for 
`/gnu/store/8acnk9shp48ppd75q9sbih49gz5m2wgb-qemu-minimal-5.0.0.drv' failed 
with exit code 1
@ build-failed 
/gnu/store/8acnk9shp48ppd75q9sbih49gz5m2wgb-qemu-minimal-5.0.0.drv - 1 builder 
for `/gnu/store/8acnk9shp48ppd75q9sbih49gz5m2wgb-qemu-minimal-5.0.0.drv' failed 
with exit code 1
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