Re: [Qemu-devel] [Bug 1246890] [NEW] AC97 sound card crashes QEMU

[Jan Kiszka]

On 2013-10-31 21:48, John Arbuckle wrote:
> Public bug reported:
> 
> The AC97 sound card does not work. It stops QEMU on startup. The cause
> appears to be some kind of deadlock.
> 
> Steps to reproduce:
> Just add -soundhw ac97 to QEMU's arguments. Example: qemu-system-ppc -soundhw 
> ac97
> 
> The example above is all it takes to reproduce the problem.
> 
> This problem has been observed on Mac OS X and Debian Linux.
> 
> I question whether the ac97 support ever worked. It is a file that was
> taken from VirtualBox and added to QEMU. I do know that VirtualBox's
> support for the ac97 sound card works perfectly.
> 
> The exact line of code that stops QEMU in its tracks is located in the
> file main-loop.c, in the function os_host_main_loop_wait(), the call
> made to qemu_mutex_lock_iothread(). The is where QEMU stops under Mac OS
> X.
> 
> ** Affects: qemu
>      Importance: Undecided
>          Status: New
> 

Maybe this is just a regression: I'm using ac97 for a win7 guest for a
while, and since recently (don't recall when precisely, some weeks
maybe) I'm getting "main-loop: WARNING: I/O thread spun for 1000
iterations", a temporarily stuck guest and broken sound output. This
used to work fine. Someone has to bisect, I didn't find the time yet.

Jan

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