Re: [Qemu-devel] Bug#688964: qemu-kvm: Fedora 17 guest hangs on boot with soft lockup in udevd

[Michael Tokarev]

To clarify:

 1. this only affects 1.1.x tree (which is a
    history for most developers already)
 2. the same guest boots okay with 1.2 (with
    kvm and irqchip enabled).

BTW, what is this hda-duplex device anyway?  I never heard of it
before now :).  And I guess using QEMU_AUDIO_DRV=none with a guest
sound device isn't very smart move ;)  (But setting it to something
else does not change things).

Also note that 1.1.1 contained one more patch which added msi
reset, this time for ahci.

Thanks,

/mjt

>   QEMU_AUDIO_DRV=none qemu-kvm -nodefconfig -nodefaults -enable-kvm \
>    -monitor stdio -rtc base=utc \
>    -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 \
>    -m 512 -vga cirrus -cdrom Fedora-17-x86_64-Live-Desktop.iso \
>    -device intel-hda,id=sound0,bus=pci.0,addr=0x4 \
>    -device hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0
> 
> leads to this in guest:
> 
> ...
> Starting udev Wait for Complete Device Initialization...
> [    4.123978] piix4_smbus 0000:00:01.3: SMBus Host Controller at 0xb100, 
> revision 0
> [    4.311473] microcode: AMD CPU family 0x6 not supported
> [    4.355429] microcode: AMD CPU family 0x6 not supported
> [    7.323032] ALSA sound/pci/hda/hda_intel.c:823 azx_get_response timeout, 
> switching to polling mode: last cmd=0x000f0000
> [    8.325018] ALSA sound/pci/hda/hda_intel.c:831 No response from codec, 
> disabling MSI: last cmd=0x000f0000
> [   36.055021] BUG: soft lockup - CPU#0 stuck for 22s! [udevd:385]
> [   36.055026] Modules linked in: snd_hda_intel(+) snd_hda_codec snd_hwdep 
> i2c_piix4 snd_pcm i2c_core snd_page_alloc snd_timer snd soundcore uinput 
> squashfs

> commit 0ec39075710ae15acc2a5825cd21e0c229fa04af
> (8e729e3b521d9fcd87fc2e40b6322e684f58bb2e upstream)
> Author: Jan Kiszka <address@hidden>
> Date:   Fri May 11 11:42:35 2012 -0300
> 
>     intel-hda: Fix reset of MSI function