User informed that after updating from Qt 5.12 to Qt 5.15.5 their crashes in 1 from 10 attempts when searching not paired BLE devices.
Crash occurs in Windows part of Qt's Bluetooth implementation.
BLE Scanner example also crashes with users in 1 of 10 attempts when try to search for devices.
Qt support has tried to get the crash with 5.15.5, prebuilt for MSVC 2019 x64 on Windows 10 but no luck.
I'm using prebuilt libraries. To reproduce the crash I scan for 3 devices
using a Bluetooth 4.1 stack. When I scan for 1 device the scan process seems
okay, When searching for 3 devices and when changing from 3 to 2 or to 1
advertising device the application was crashing. First all devices are found,
when I repeat scanning with less devices it could be that the app is crashing.
I cannot reproduce the crash with a specific step by step description. It
seems that it is occuring randomized.
The crash occured on 3 PCs using Windows 10 in our dev department. On Android
and IOS the scan process was okay in our app.
User also tested lowenergyscanner example with UWP version Qt 5.15.5 (from installer) and it crashed too.