"Cannot make QOpenGLContext current in a different thread"

[jiangzhengwenjz]

The build you are using: 0.8-0.8.0-6037-2368391f
The operating system you're using: ubuntu 18.04
Your CPU and graphics card: i5-4210U/Intel Haswell Mobile

So, I downloaded the debian packages from mgba.io. In mgba-qt, I can load ROMs and play without any problem, but when I exit the program, the following appear in the terminal:

Cannot make QOpenGLContext current in a different thread
Aborted (core dumped)

[endrift]

Are you exiting via the menu or via the X in the corner? Are you using the Shutdown option in the Emulation menu?

It shouldn't matter, but I just want to narrow down if there are any potential places things could be going wrong. Also, are you using the OpenGL enhancement renderer? If so, I fixed a bug the other day that might be related.

[jiangzhengwenjz]

@endrift

Are you exiting via the menu or via the X in the corner? Are you using the Shutdown option in the Emulation menu?

I tried both and they produced the same problem.

Also, are you using the OpenGL enhancement renderer?

No, I'm using software renderer. However, switching to OpenGL in tools -> settings -> enhancements (and restarting the program) produced the same problem.

[jiangzhengwenjz]

Also I found switching ROM halfway can also cause the problem.

[endrift]

Do you have gdb installed? If so, can you get a backtrace of where it's aborting?

[jiangzhengwenjz]

[Thread 0x7fffb53d5700 (LWP 8698) exited]
[Thread 0x7fffb4b73700 (LWP 8700) exited]
[Thread 0x7fffb4bb4700 (LWP 8699) exited]
Cannot make QOpenGLContext current in a different thread

Thread 10 "Painter Thread" received signal SIGABRT, Aborted.
[Switching to Thread 0x7fffb5bd6700 (LWP 8697)]
__GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
51	../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt full
#0  0x00007ffff781be97 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
        set = 
            {__val = {0, 6867800724958234951, 0, 0, 1139802112, 0, 1104674816, 0, 0, 0, 36029346783166592, 36029346783166592, 4611375109753212693, 0, 4596535490694461912, 0}}
        pid = <optimized out>
        tid = <optimized out>
#1  0x00007ffff781d801 in __GI_abort () at abort.c:79
        save_stage = 1
        act = 
          {__sigaction_handler = {sa_handler = 0x0, sa_sigaction = 0x0}, sa_mask = {__val = {0 <repeats 16 times>}}, sa_flags = -1245883592, sa_restorer = 0x7fffb5bd5338}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007ffff4badfb7 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007ffff539ec73 in QOpenGLContext::makeCurrent(QSurface*) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#4  0x00007ffff56b2234 in QOpenGLVertexArrayObject::destroy() () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#5  0x00007ffff56a52f8 in  () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#6  0x00007ffff56a5519 in  () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#7  0x00007ffff56a06d9 in QOpenGL2PaintEngineEx::~QOpenGL2PaintEngineEx() () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#8  0x00007ffff4bc19cd in QThreadStorageData::finish(void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007ffff4bc2293 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007ffff4bc3185 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007ffff62196db in start_thread (arg=0x7fffb5bd6700) at pthread_create.c:463
        pd = 0x7fffb5bd6700
        now = <optimized out>
        unwind_buf = 
              {cancel_jmp_buf = {{jmp_buf = {140736242476800, -5838237106816543698, 140736242472768, 0, 93825026988848, 140737488340144, 5838073807032685614, 5838219876727395374}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#12 0x00007ffff78fe88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

[endrift]

This should be fixed now; let me know if it's still broken for whatever reason.

[endrift]

Caused #1686.