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+debug: 0.977
+permissions: 0.968
+ppc: 0.966
+graphic: 0.965
+register: 0.964
+assembly: 0.964
+virtual: 0.963
+semantic: 0.960
+vnc: 0.959
+arm: 0.957
+device: 0.956
+PID: 0.955
+performance: 0.949
+files: 0.947
+socket: 0.945
+peripherals: 0.944
+architecture: 0.941
+boot: 0.938
+TCG: 0.935
+kernel: 0.934
+VMM: 0.934
+hypervisor: 0.933
+network: 0.930
+risc-v: 0.929
+x86: 0.925
+user-level: 0.925
+KVM: 0.924
+mistranslation: 0.899
+i386: 0.836
+
+Segfault in audio_pcm_sw_write with audio over VNC
+
+QEMU 5.0.0, built with ./configure --target-list=x86_64-softmmu --enable-debug --disable-strip --disable-docs --disable-sdl
+
+Running on a headless host (Ryzen 3600), Arch Linux, 64bit latest.
+Guest is also Arch Linux, 64bit.
+
+Started with qemu-system-x86_64 -vnc 0.0.0.0:0 -enable-kvm -m 4096 -cpu host -smp cores=2,threads=1,sockets=1 -machine q35 -vga std -device
+ ich9-ahci,id=ahci -drive file=vm0.qcow2,format=qcow2,if=none,id=dsk0 -device ide-hd,drive=dsk0,bus=ahci.0 -soundhw hda
+
+So, a headless VM is running on a server and is being connected to over VNC. The virtual sound card is detected and speaker test is running inside the VM. So far so good.
+
+Then, i tell the VNC client to enable audio (QEMU Audio Client Message, 255,1,0). QEMU responds with a "stream is about to start" message (QEMU Audio Server Message, 255,1,1) and then promptly crashes without sending anything else.
+
+Running it in GDB produces a crash at audio/audio.c:739
+
+Thread 1 "qemu-system-x86" received signal SIGSEGV, Segmentation fault.
+audio_pcm_sw_write (sw=0x5555575bbf30, buf=0x0, size=1628) at audio/audio.c:739
+739             if (!sw->hw->pcm_ops->volume_out) {
+
+The exact sequence of events does not matter - i can enable sound before playing anything, and then it would say nothing and keep working, but crash with the same message once anything sound-playing is launched in the VM.
+
+Using different soundhw or adding various audiodev options does not seem to affect anything.
+
+I can't quite figure out if the QEMU Audio VNC extension is supposed to work at all or not, but it would be handy to me if it is.
+
+On 6/9/20 7:10 PM, Artyom wrote:
+> Public bug reported:
+> 
+> QEMU 5.0.0, built with ./configure --target-list=x86_64-softmmu
+> --enable-debug --disable-strip --disable-docs --disable-sdl
+> 
+> Running on a headless host (Ryzen 3600), Arch Linux, 64bit latest.
+> Guest is also Arch Linux, 64bit.
+> 
+> Started with qemu-system-x86_64 -vnc 0.0.0.0:0 -enable-kvm -m 4096 -cpu host -smp cores=2,threads=1,sockets=1 -machine q35 -vga std -device
+>  ich9-ahci,id=ahci -drive file=vm0.qcow2,format=qcow2,if=none,id=dsk0 -device ide-hd,drive=dsk0,bus=ahci.0 -soundhw hda
+> 
+> So, a headless VM is running on a server and is being connected to over
+> VNC. The virtual sound card is detected and speaker test is running
+> inside the VM. So far so good.
+> 
+> Then, i tell the VNC client to enable audio (QEMU Audio Client Message,
+> 255,1,0). QEMU responds with a "stream is about to start" message (QEMU
+> Audio Server Message, 255,1,1) and then promptly crashes without sending
+> anything else.
+> 
+> Running it in GDB produces a crash at audio/audio.c:739
+> 
+> Thread 1 "qemu-system-x86" received signal SIGSEGV, Segmentation fault.
+> audio_pcm_sw_write (sw=0x5555575bbf30, buf=0x0, size=1628) at audio/audio.c:739
+> 739             if (!sw->hw->pcm_ops->volume_out) {
+
+Isn't it the one fixed by
+https://<email address hidden>/msg705896.html?
+
+> 
+> The exact sequence of events does not matter - i can enable sound before
+> playing anything, and then it would say nothing and keep working, but
+> crash with the same message once anything sound-playing is launched in
+> the VM.
+> 
+> Using different soundhw or adding various audiodev options does not seem
+> to affect anything.
+> 
+> I can't quite figure out if the QEMU Audio VNC extension is supposed to
+> work at all or not, but it would be handy to me if it is.
+> 
+> ** Affects: qemu
+>      Importance: Undecided
+>          Status: New
+> 
+
+
+
+Great.
+Can confirm, that patch fixes it.
+
+commit cbaf25d1f59ee13fc7542a06ea70784f2e000c04.
+