Re: [Qemu-devel] qemu hangs when reading disk images (OS X)

[Alexander Graf]

On 07.02.2009, at 08:40, C.W.Betts wrote:

> I have noticed that qemu hangs when I launch it.  from what I can  
> tell, it seems to be based on the reading of disk images:  Here's a  
> sample taken from the PowerPC build:
> Sampling process 12004 for 3 seconds with 1 millisecond of run time  
> between samples
> Sampling completed, processing symbols...
> Analysis of sampling qemu-system-ppc (pid 12004) every 1 millisecond
> Call graph:
>    2542 Thread_2503
>      2542 start
>        2542 main
>          2542 -[NSApplication run]
>            2542 -[NSApplication  
> nextEventMatchingMask:untilDate:inMode:dequeue:]
>              2542 _DPSNextEvent
>                2542 AEProcessAppleEvent
>                  2542 aeProcessAppleEvent
>                    2542 dispatchEventAndSendReply(AEDesc const*,  
> AEDesc*)
>                      2542 aeDispatchAppleEvent(AEDesc const*,  
> AEDesc*, unsigned int, unsigned char*)
>                        2542 _NSAppleEventManagerGenericHandler
>                          2542 -[NSAppleEventManager  
> dispatchRawAppleEvent:withRawReply:handlerRefCon:]
>                            2542 - 
> [NSApplication(NSAppleEventHandling) _handleCoreEvent:withReplyEvent:]
>                              2542 - 
> [NSApplication(NSAppleEventHandling) _handleAEOpen:]
>                                2542 -[NSApplication  
> _sendFinishLaunchingNotification]
>                                  2542 -[NSApplication  
> _postDidFinishNotification]
>                                    2542 -[NSNotificationCenter  
> postNotificationName:object:userInfo:]
>                                      2542  
> _CFXNotificationPostNotification
>                                        2542 _nsnote_callback
>                                          2542 - 
> [QemuCocoaAppController startEmulationWithArgc:argv:]
>                                            2542 qemu_main
>                                              2542 ppc_heathrow_init
>                                                2542  
> pci_cmd646_ide_init
>                                                  2542 ide_init2
>                                                    2542  
> bdrv_guess_geometry
>                                                      2542 bdrv_read_em
>                                                        2542 select 
> $DARWIN_EXTSN
>                                                          2542 select 
> $DARWIN_EXTSN
>
> Total number in stack (recursive counted multiple, when >=5):
>
> Sort by top of stack, same collapsed (when >= 5):
>        select$DARWIN_EXTSN        2542
> Sample analysis of process 12004 written to file /dev/stdout

Yes, please see my thread on this issue 1 or 2 weeks ago. For now,  
just pass --disable-aio to the guest or help in debugging what's  
causing it :-).

Alex