[Bug 262671] Kernel panics after a invalid SNDCTL_MIXERINFO ioctl

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=262671

--- Comment #8 from Aleksander Slomka <alex@alexslomka.xyz> ---
> The highest unit number here is 3, but when I checked in kgdb `devclass_get_maxunit(pcm_devclass)` returns the value `5`.
To clarify things - `devclass_get_maxunit(pcm_devclass)` should return 4 since
I have only 4 mixer devices, but it returns 5.

Now the problem is that I have no idea how to debug why
`devclass_get_maxunit(pcm_devclass)` is returning the wrong value.

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