Unable to debug Android App (Windows + Qt Creator 12 + LLDB)

Axel Spoerl

@JoeCFD
Does that mean, things break with JDK 17?

JoeCFD

@Axel-Spoerl Nope. No break stop in the code, instead in disassembler.

cristian-adam

At https://github.com/qt-creator/qt-creator/actions/runs/8161009528 I have artifacts for a fix for the Android debugger issue.

It's one line of code that brings Qt Creator 13 to the level of Qt Creator 10.

In my case of MacBook Pro M1 I am getting breakpoints hits and no longer "Waiting for debugger".

JoeCFD

@cristian-adam Good news. We have to use 13? No fix in 12?

cristian-adam

@JoeCFD At https://wiki.qt.io/Qt_Creator_Releases there is no 12.0.3 release planed.

But, you can backport the change, is just one liner. Just clone Qt Creator on GitHub, cherry-pick the change and push a release tag to your fork. You will get releases automatically.

cristian-adam

https://download.qt.io/snapshots/qtcreator/13.0/13.0.0-rc1/78/ has the needed fixes for the working Android debugging.

JoeCFD

@cristian-adam just downloaded it and had a try. The problem is still there.
Ubuntu 22.04
Qt 6.6.2
JDK-17
NDK 21 or 25

cristian-adam

@JoeCFD I just gave it a try on my MacBook Pro M1 with:

Qt 6.6.1
Android arm64-v8 emulator image
Android SDK 33
Android NDK 25
OpenJDK-17

See the recording at qtcreator13-android33.mp4.

Axel Spoerl

@JoeCFD
Note the following:

if you have legacy break points, remove them all.
if you want to set a break point into main(), add a QThread::sleep(1) on top. It has to be the first instruction in main.
if you set no break points at all, the debugger will still jump to the disassembler. It looks as if the bug was still present. If you hit "continue" many times (18 in my case), the debuggee will start normally.

cristian-adam

I have tested the "dice" Qt example and I was able to land into "disassembly" only the first time that the application was installed on the device.

If I click continue it will skip all the SIGSEGVS and would hit my breakpoints.

See the recording: qtcreator13-disassembly.

The Java exceptions are implemented with signals and it looks like the lldb-server is picking up and giving them further down the chain.

Android Studio users also have this problem see Android Studio keeps pausing with SIGSEGV (signal SIGSEGV: invalid address (fault address: 0x0)) at random [240007217] - Issue Tracker (google.com)

I have tried telling the debugger to ignore the signal:

process handle SIGSEGV --pass true --stop false --notify true

but it didn't work.

This doesn't look like a Qt Creator bug.

cristian-adam

As a workaround one can paste (plus Enter):

pro hand -p true -s false SIGSEGV

In the debugger console at the first assembly hit, and then all the rest are ignored!

See qtcreator13-only-one-dissassembly-hit.mp4

esnosy

I had luck with using ADB over Wi-Fi, debugging with QtCreator works at least once with ADB over Wi-Fi, in Android Studio debugging worked for me over USB and Wi-Fi, at least for a hello world app

EDIT: I take it back

Axel Spoerl

@esnosy said in Unable to debug Android App (Windows + Qt Creator 12 + LLDB):

EDIT: I take it back

Does that mean, you are still struggling?