Flaky race-condition in QuickTest when running tst_inputpanel built with ASAN

How to reproduce

Compile Qt with -sanitize address and under module qtvirtualkeyboard run tst_inputpanel::tst_plugin::test_fullScreenModeWordReselection in a loop:

export ASAN_OPTIONS=detect_leaks=0    # ignore memory leaks

while ./tst_inputpanel tst_plugin::test_fullScreenModeWordReselection; do : ; done

Problem

It will crash spuriously (around 1 out of 10 times) with either a heap-use-after-free or a stack-buffer-overflow.

Logs

See attached files.

If you need to debug it, I have setup a VM where the problem manifests. Get in touch with me to get access.

NOTE

This is the last issue remaining to enable blocking ASAN testruns in all modules of Qt.