<![CDATA[Qt5 and Qt6 Bluetooth crashes on segmentation fault.]]>Hello everyone.

When running with QBluetooth, and call "QLowEnergyService::discoverDetails", it random crash.
There are the trace of my application:

Thread 41 received signal SIGSEGV, Segmentation fault.
[Switching to Thread 58424.0xeffc]
0x00007ffdd6a13b6a in Qt5Bluetooth!?setMaxPendingConnections@QBluetoothServer@@QEAAXH@Z ()
   from S:\X\dist\Qt5Bluetooth.dll
(gdb) bt
#0  0x00007ffdd6a13b6a in Qt5Bluetooth!?setMaxPendingConnections@QBluetoothServer@@QEAAXH@Z ()
   from S:\X\dist\Qt5Bluetooth.dll
#1  0x00007ffdd6a12620 in Qt5Bluetooth!?setMaxPendingConnections@QBluetoothServer@@QEAAXH@Z ()
   from S:\X\dist\Qt5Bluetooth.dll
#2  0x00007ff700eb6404 in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)

Qt version:5.15.2
build with msvc

]]>https://forum.qt.io/topic/131659/qt5-and-qt6-bluetooth-crashes-on-segmentation-faultRSS for NodeThu, 05 Nov 2026 10:59:26 GMTWed, 03 Nov 2021 04:55:05 GMT60<![CDATA[Reply to Qt5 and Qt6 Bluetooth crashes on segmentation fault. on Wed, 03 Nov 2021 09:24:44 GMT]]>The similar problem: https://forum.qt.io/topic/119766/unknown-exception-is-not-beeing-caught-in-trycatch-block-bluetooth-low-energy-servicedetailsdiscovery

]]>https://forum.qt.io/post/688182https://forum.qt.io/post/688182Wed, 03 Nov 2021 09:24:44 GMT<![CDATA[Reply to Qt5 and Qt6 Bluetooth crashes on segmentation fault. on Wed, 03 Nov 2021 09:06:50 GMT]]>I think i found solution, before call "QLowEnergyService::discoverDetails", if "QLowEnergyController" emit error signals, and the error is "RemoteHostClosedError", we cannot do it, it will caused crash. The truly method is giveup the conntion, and wait next connection.

]]>https://forum.qt.io/post/688167https://forum.qt.io/post/688167Wed, 03 Nov 2021 09:06:50 GMT<![CDATA[Reply to Qt5 and Qt6 Bluetooth crashes on segmentation fault. on Wed, 03 Nov 2021 07:45:21 GMT]]>@ChrisW67 I try to debug it, The debugger tell me "Unhandled exception at 0x00007FFDCD113B6A (Qt5Bluetooth.dll) in ble_tester.exe: 0xC0000005: Access violation reading location 0x0000000000000000."
Access violation reading location 0x0000000000000000
Slot

]]>https://forum.qt.io/post/688128https://forum.qt.io/post/688128Wed, 03 Nov 2021 07:45:21 GMT<![CDATA[Reply to Qt5 and Qt6 Bluetooth crashes on segmentation fault. on Wed, 03 Nov 2021 07:02:36 GMT]]>@Zmmfly The last line says something is trampling on memory it should not be, or you are mixing library versions, or overwriting a fixed buffer... Run a debug build of your program in your debugger and see where it goes wrong. We cannot do that for you.

]]>https://forum.qt.io/post/688105https://forum.qt.io/post/688105Wed, 03 Nov 2021 07:02:36 GMT