QEMU tests fail randomly on "Exec format error"

Test have started to fail randomly on "Exec format error". This has happened on multiple modules, but always on QEMU targets.

Here is an example fail:
agent:2023/08/14 04:36:17 build.go:405: Start 1: tst_qserialport
agent:2023/08/14 04:36:17 build.go:405: 1: Test command: /opt/cmake-3.24.2/bin/cmake "-P" "/home/qt/work/qt/qtserialport_standalone_tests/tests/auto/qserialport/tst_qserialportWrapperRelWithDebInfo.cmake"
agent:2023/08/14 04:36:17 build.go:405: 1: Working Directory: /home/qt/work/qt/qtserialport_standalone_tests/tests/auto/qserialport
agent:2023/08/14 04:36:17 build.go:405: 1: Test timeout computed to be: 1500
agent:2023/08/14 04:36:17 build.go:405: 1: qt-testrunner.py INFO: Will write XML test logs to directory COIN_CTEST_RESULTSDIR=/home/qt/work/testresults
agent:2023/08/14 04:36:17 build.go:405: 1: qt-testrunner.py DEBUG: Running test command line: ['/home/qt/work/qt/qtserialport_standalone_tests/tests/auto/qserialport/tst_qserialport', '-o', '/home/qt/work/testresults/tst_qserialport-1691987777190.xml,xml', '-o', '/home/qt/work/testresults/tst_qserialport-1691987777190.junit.xml,junitxml', '-o', '/home/qt/work/testresults/tst_qserialport-1691987777190.txt,txt', '-o', '-,txt']
agent:2023/08/14 04:36:17 build.go:405: 1: qt-testrunner.py ERROR: exception:OSError [Errno 8] Exec format error: '/home/qt/work/qt/qtserialport_standalone_tests/tests/auto/qserialport/tst_qserialport'
agent:2023/08/14 04:36:17 build.go:405: 1: qt-testrunner.py ERROR: The test executable probably crashed, see above for details
agent:2023/08/14 04:36:17 build.go:405: 1: qt-testrunner.py INFO: Will re-run the full test executable
agent:2023/08/14 04:36:17 build.go:405: 1: qt-testrunner.py DEBUG: Running test command line: ['/home/qt/work/qt/qtserialport_standalone_tests/tests/auto/qserialport/tst_qserialport', '-o', '/home/qt/work/testresults/tst_qserialport-1691987777193.xml,xml', '-o', '/home/qt/work/testresults/tst_qserialport-1691987777193.junit.xml,junitxml', '-o', '/home/qt/work/testresults/tst_qserialport-1691987777193.txt,txt', '-o', '-,txt']
agent:2023/08/14 04:36:17 build.go:405: 1: qt-testrunner.py ERROR: exception:OSError [Errno 8] Exec format error: '/home/qt/work/qt/qtserialport_standalone_tests/tests/auto/qserialport/tst_qserialport'
agent:2023/08/14 04:36:17 build.go:405: 1: qt-testrunner.py ERROR: The test executable probably crashed, see above for details
agent:2023/08/14 04:36:17 build.go:405: 1: qt-testrunner.py ERROR: Full test run failed repeatedly, aborting!
agent:2023/08/14 04:36:17 build.go:405: 1: CMake Error at tst_qserialportWrapperRelWithDebInfo.cmake:18 (message):
agent:2023/08/14 04:36:17 build.go:405: 1: /home/qt/work/install/libexec/qt-testrunner.py –
agent:2023/08/14 04:36:17 build.go:405: 1: /home/qt/work/qt/qtserialport_standalone_tests/tests/auto/qserialport/tst_qserialport
agent:2023/08/14 04:36:17 build.go:405: 1: execution failed with exit code 3.

Another example:
https://testresults.qt.io/coin/api/log/qt/qthttpserver/2659d645ac293324af52c1d9273ee27d0325467a/LinuxUbuntu_22_04x86_64LinuxQEMUarmv7GCCqtci-linux-Ubuntu-22.04-x86_64-51-166e66Sccache_UseConfigure/04750a542ed4281aad1f78778914cdb9f7269828/test_1697477772/log.txt.gz