[Bug 1873769] [NEW] SB16 audio playback freezes emulation in Windows 95 guest

[Marko Štamcar]

Public bug reported:

- 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.

** Affects: qemu
     Importance: Undecided
         Status: New

** Attachment added: "Video screen capture of the issue"
   
https://bugs.launchpad.net/bugs/1873769/+attachment/5357082/+files/win95audio.mp4

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https://bugs.launchpad.net/bugs/1873769

Title:
  SB16 audio playback freezes emulation in Windows 95 guest

Status in QEMU:
  New

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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