[Bug 279839] panic: bogus vchan_create

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=279839

--- Comment #2 from Christos Margiolis <christos@freebsd.org> ---
I am trying to reproduce this with my USB soundcard by setting the play vchans
from 1 to 4, but I don't hit the same problem. Apparently you are hitting the
KASSERT in vchan_setnew(). It would be very helpful to see what KASSERT prints
(i.e what the values of newcnt and vcnt are).

Can you also share your /boot/loader.conf, hw.snd and hw.usb.uaudio?

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