smoketest fails on AARCH64 platform

[iav]

Smoketest fails on latest master commit 32aabbc4e on AARCH64 platform

-- Verify dependencies --
OK
-- Test: default --
Building.
Running tests.
-- Test: debug --
Building.
Running tests.
============================= test session starts ==============================
platform linux -- Python 3.9.2, pytest-6.0.2, py-1.10.0, pluggy-0.13.0
rootdir: /root/bcachefs-tools
plugins: forked-1.3.0, xdist-2.2.0
gw0 I / gw1 I / gw2 I / gw3 I / gw4 I / gw5 I
gw0 [28] / gw1 [28] / gw2 [28] / gw3 [28] / gw4 [28] / gw5 [28]

..ssss.F.sssssssss.s.s.s....                                             [100%]
=================================== FAILURES ===================================
_________________________________ test_format __________________________________
[gw1] linux -- Python 3.9.2 /usr/bin/python3

tmpdir = local('/tmp/pytest-of-root/pytest-8/popen-gw1/test_format0')

    def test_format(tmpdir):
        dev = util.device_1g(tmpdir)
        ret = util.run_bch('format', dev, valgrind=True)
    
>       assert ret.returncode == 0
E       AssertionError: assert 1 == 0
E        +  where 1 = CompletedProcess(args=['/root/bcachefs-tools/bcachefs', 'format', PosixPath('/tmp/pytest-of-root/pytest-8/popen-gw1/te...\nIO error\n', stderr='error opening /tmp/pytest-of-root/pytest-8/popen-gw1/test_format0/dev-1g: Input/output error\n').returncode

tests/test_basic.py:19: AssertionError
----------------------------- Captured stdout call -----------------------------
Running '['/root/bcachefs-tools/bcachefs', 'format', PosixPath('/tmp/pytest-of-root/pytest-8/popen-gw1/test_format0/dev-1g')]'
=========================== short test summary info ============================
FAILED tests/test_basic.py::test_format - AssertionError: assert 1 == 0
=================== 1 failed, 11 passed, 16 skipped in 3.92s ===================

FAILED.