[Qemu-devel] Problem under OSX Lion: GThread-ERROR **: GThread system may only be initialized once

[Juan Pineda]

The current Qemu master branch crashes under OSX with a GThread error. 
Commenting out vlc.c line 2188 (call to g_thread_init) allows it to run 
successfully. I am running OSX Lion. Two caveats:

1) You need to apply Andreas' patch to softfloat.h to fix compile error for 
uint16
2) You need to compile with gcc-4.2 (non LLVM gcc) and specify --disable-user 
to successfully compile

See log below.

Thanks!
-Juan



$ ./configure --disable-user --enable-debug --cc=gcc-4.2 --host-cc=gcc-4.2
$ make
$ gdb ./i386-softmmu/qemu-system-i386 
...
GThread-ERROR **: GThread system may only be initialized once.
aborting...

Program received signal SIGABRT, Aborted.
0x00007fff8e50dce2 in __pthread_kill ()
(gdb) bt
#0  0x00007fff8e50dce2 in __pthread_kill ()
#1  0x00007fff94dc17d2 in pthread_kill ()
#2  0x00007fff94db2a7a in abort ()
#3  0x0000000100da28c3 in g_logv ()
#4  0x0000000100da247e in g_log ()
#5  0x0000000100d74333 in g_thread_init ()
#6  0x00000001000e6d8c in qemu_main (argc=3, argv=0x10a896710, 
envp=0x7fff5fbff120) at /Users/juan/Temp/build/qemu-source_code/vl.c:2188
#7  0x0000000100142e65 in -[QemuCocoaAppController 
startEmulationWithArgc:argv:] (self=0x1011299d0, _cmd=0x1002818e4, argc=3, 
argv=0x10a896710) at cocoa.m:798
#8  0x000000010014306a in -[QemuCocoaAppController 
openPanelDidEnd:returnCode:contextInfo:] (self=0x1011299d0, _cmd=0x1002818aa, 
sheet=0x10114e450, returnCode=1, contextInfo=0x0) at cocoa.m:822
#9  0x00007fff9551955e in -[NSSavePanel _didEndSheet:returnCode:contextInfo:] ()
#10 0x00007fff952987d7 in -[NSApplication endSheet:returnCode:] ()
#11 0x00007fff94a78a1d in -[NSObject performSelector:withObject:] ()
#12 0x00007fff950e7710 in -[NSApplication sendAction:to:from:] ()
#13 0x00007fff950e7642 in -[NSControl sendAction:to:] ()
#14 0x00007fff950e756d in -[NSCell _sendActionFrom:] ()
#15 0x00007fff950e6a30 in -[NSCell trackMouse:inRect:ofView:untilMouseUp:] ()
#16 0x00007fff951668e0 in -[NSButtonCell 
trackMouse:inRect:ofView:untilMouseUp:] ()
#17 0x00007fff950e563a in -[NSControl mouseDown:] ()
#18 0x00007fff950b00e0 in -[NSWindow sendEvent:] ()
#19 0x00007fff9504868f in -[NSApplication sendEvent:] ()
#20 0x00007fff94fde682 in -[NSApplication run] ()
#21 0x0000000100144254 in main (argc=1, argv=0x7fff5fbff110) at cocoa.m:945
(gdb) up
#1  0x00007fff94dc17d2 in pthread_kill ()
(gdb) up
#2  0x00007fff94db2a7a in abort ()
(gdb) up
#3  0x0000000100da28c3 in g_logv ()
(gdb) up
#4  0x0000000100da247e in g_log ()
(gdb) up
#5  0x0000000100d74333 in g_thread_init ()
(gdb) up
#6  0x00000001000e6d8c in qemu_main (argc=3, argv=0x10a896710, 
envp=0x7fff5fbff120) at /Users/juan/Temp/build/qemu-source_code/vl.c:2188
2188        g_thread_init(NULL);
Current language:  auto; currently c
(gdb) 



On Oct 31, 2011, at 8:32 AM, Juan Pineda wrote:

> Hi Andreas,
> 
> Thanks for your reply. You can verify that my cocoa.m patch works 100% under 
> 0.15.1. That's where I was testing it. The fix is completely independent of 
> the other problems in the OSX build (uint16, GThread, etc.) that have cropped 
> up since 0.15.1, so there should be no problem merging it.
> 
> I will us GDB on that GThread error to find the source code line where it 
> failed and post what I find.
> 
> Thanks!
> -Juan
> 
> 
> 
> On Oct 30, 2011, at 3:45 PM, Andreas Färber wrote:
> 
>> Am 18.10.2011 16:35, schrieb Juan Pineda:
>>>>> What command line do you use? If using the right arguments you
>>>>> shouldn't see a window at all. Are you maybe using -drive instead of
>>>>> -hda and that is not yet handled correctly?
>>> 
>>> The boot volume dialog appears only when a hard disk file is not supplied 
>>> on the command line. I would think the failure of the dialog to close is 
>>> not unique to Lion. However in prior OS releases it probably does not 
>>> present a problem as the main window can be raised above the dialog.
>> 
>> If that were the case I would see it as worth fixing there, too. :)
>> 
>>>>> Apart from this issue, is it working correctly for you?
>> 
>>> However building the main branch (with flags as above) does not work. The 
>>> build fails with error about redefinition of uint16 in fpu/softfloat.h. If 
>>> that is fixed the build completes. But trying to run qemu-system-i386 quits:
>>> 
>>>> $ i386-softmmu/qemu-system-i386 -hda ~/Downloads/linux-0.2.img
>>>> 
>>>> GThread-ERROR **: GThread system may only be initialized once.
>>>> aborting...
>>>> Abort trap: 6
>> 
>> That's what I'm seeing, too, so I don't feel comfortable committing this
>> patch now. It compiles file, but it crashes either way with a message
>> similar to the above, so I don't see an improvement (yet).
>> 
>> If you could pinpoint where this error stems from (e.g., single-stepping
>> in gdb) that might help getting it fixed.
>> 
>> Thanks,
>> Andreas
>