On Mon, Jul 27, 2020 at 8:02 PM Takashi Iwai <tiwai@xxxxxxx> wrote: > > On Mon, 27 Jul 2020 19:47:54 +0200, > Andrey Konovalov wrote: > > > > Hi Takashi, > > > > We're working on syzkaller descriptions for /dev/sequencer [1], but > > have some troubles understanding its functionality. The main question > > is: is sound/synth/emux/ code reachable when tested in a VM (we're > > using QEMU with -soundhw all), or does it require some specific > > hardware to be present? > > It's for Creative SoundBlaster EMU chips, and it needs the specific > hardware that isn't emulated, so far. > > > In our setup (with Debian Stretch userspace image) we have > > /dev/sequencer with SNDRV_MINOR_OSS_SEQUENCER and /dev/sequencer2 with > > SNDRV_MINOR_OSS_MUSIC. For the former, there are no synth devices as > > reported by SNDCTL_SEQ_NRSYNTHS. For the latter, synth devices are > > there, but the load_patch() callback is not reachable as this check > > [2] fails. > > > > Is that code impossible to test in a VM at all? Or are there some > > specific kernel options/drivers that need to be enabled? > > Another possible device supporting the OSS sequencer is the old FM > OPL3. But it seems also not properly implemented in QEMU (I see only > OPL2), unfortunately. OK, got it, thank you!
