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[Bug 1873769] Re: SB16 audio playback freezes emulation in Windows 95 gu

From: Vladislav K. Valtchev
Subject: [Bug 1873769] Re: SB16 audio playback freezes emulation in Windows 95 guest
Date: Wed, 06 Jan 2021 15:45:36 -0000

Hi Allan, 
I've hit EXACTLY the same problem, while writing a SB16 driver.

Reproducing the bug
I've tried to QEMU 4 in several scenarios (GTK UI, text mode with the -curses 
just serial console with -nographic and with virt-manager which uses Spice). It 
as expected in all the cases EXCEPT for the GTK UI: in that case, the video 
while playing the sound, exactly as in the video posted by Marko; even QEMU's 
doesn't respond while the audio is playing (the bug affects the whole QEMU UI).

I've also tried the same test with QEMU 2.11, on another machine with Ubuntu 
18.04 (LTS)
and there the problem simply does *not* exist. QEMU's UI (does QEMU 2.x uses 
works GREAT while playing SB16 audio.

Is there any chance this bug could be fixed easily, or a fix would necessarily 
a (partial) re-design of the way the GTK UI works? In particular, why on QEMU 
2.11 the
problem does not exist?

Thanks in advance,

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  SB16 audio playback freezes emulation in Windows 95 guest

Status in QEMU:

Bug description:
  - QEMU 4.2.93 (v5.0.0-rc3) built from latest git master
  20038cd7a8412feeb49c01f6ede89e36c8995472 using MSYS2 on Windows 10 and
  launched on same Windows 10

  - Launched using "qemu-system-i386.exe -drive format=raw,file=hdd-
  2gb.img -soundhw pcspk,sb16 -m 16 -cpu pentium -vga std -cdrom
  Windows_95.iso -boot c"

  - I have attached video screen capture of the issue


  I decided to make my first ever QEMU build after encountering the
  dsound issues using the latest 4.2.0 binary from
  https://qemu.weilnetz.de/w64/. In my 5.0.0-rc3 build the sound
  playback is working correctly, however the whole Windows 95 UI freezes
  while sound is playing.

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