Did some additional testing, it seems that the QEMU_AUDIO_DAC_TRY_POLL=0
I mentioned previously is not needed with Qemu 4.1, but I'm sure it was
needed with an older Qemu version, I could not get any sound with
the ALSA+dmix config I have without it back then.
In any case, I tested Qemu 4.1.1 built from git, and 4.2-1 Debian package
and this setting seems to have no bearing on the hang/freeze.
.... and I also disabled the ALSA dmix configuration to test that case,
using only basic /etc/asound.conf like this:
# cat asound.conf
pcm.!default {
type hw
card 1
}
ctl.!default {
type hw
card 1
}
and the freeze/hang happens even with that. So it's probably not the
dmix's fault either. :| Doing GDB bt gives the same backtrace, too.
Not sure what else to test, really.
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