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Re: [Qemu-devel] [Bug 1246890] [NEW] AC97 sound card crashes QEMU
From: |
Jan Kiszka |
Subject: |
Re: [Qemu-devel] [Bug 1246890] [NEW] AC97 sound card crashes QEMU |
Date: |
Fri, 01 Nov 2013 11:39:08 +0100 |
User-agent: |
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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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