Test case: tst_qmqttsubscriptionproperties::initTestCase has failed 42 times and was flaky 0 times last week.

The test has blocked around 42 gerrit changes past week

Coin log excerpt from failed run:
agent:2024/06/28 23:20:13 build.go:404: 9: QFATAL : tst_QMqttSubscriptionProperties::initTestCase() Unknown location to start MQTT test broker.
agent:2024/06/28 23:20:13 build.go:404: 9: FAIL! : tst_QMqttSubscriptionProperties::initTestCase() Received a fatal error.
agent:2024/06/28 23:20:13 build.go:404: 9: Totals: 0 passed, 1 failed, 0 skipped, 0 blacklisted, 1ms
agent:2024/06/28 23:20:13 build.go:404: 9: ********* Finished testing of tst_QMqttSubscriptionProperties *********
agent:2024/06/28 23:20:13 build.go:404: 9: Received signal 6 (SIGABRT)
agent:2024/06/28 23:20:13 build.go:404: 9: initTestCase function time: 1ms, total time: 1ms
agent:2024/06/28 23:20:13 build.go:404: 9:
agent:2024/06/28 23:20:13 build.go:404: 9: === Stack trace ===
agent:2024/06/28 23:20:13 build.go:404: 9: Could not attach to process. If your uid matches the uid of the target
agent:2024/06/28 23:20:13 build.go:404: 9: process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try
agent:2024/06/28 23:20:13 build.go:404: 9: again as the root user. For more details, see /etc/sysctl.d/10-ptrace.conf
agent:2024/06/28 23:20:13 build.go:404: 9: ptrace: Inappropriate ioctl for device.
...

Full log at : coin log
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