USB causing boot to hang

[Bjoern A. Zeeb]

On 6 Dec 2019, at 20:23, Steve Kargl wrote:

> I updates /usr/src to r355452, and updated by kernel and
> world.  Upon rebooting, verbose boot messages susgests
> the system is hanging when USB starts to attach.  With
> the 3-week kernel verbose boot shows:
>
> ...
> pcm4: <Realtek ALC889 (Rear Digital)> at nid 30 on hdaa1
> pcm4: Playback:
> pcm4:      Stream cap: 0x00000005 AC3 PCM
> pcm4:         PCM cap: 0x000e05f0 16 20 24 bits, 32 44 48 88 96 192 
> KHz
> pcm4:             DAC: 6
> pcm4:
> pcm4:     nid=30 [pin: SPDIF-out (Grey Jack)]
> pcm4:       + <- nid=6 [audio output] [src: pcm]
> pcm4:
> pcm4: Mixer "vol" -> "none": child=0x00000010
> pcm4: Mixer "pcm": parent="vol"
> pcm4: Soft PCM mixer ENABLED
> pcm4: Playback channel set is: Front Left, Front Right,
> pcm4: Playback channel matrix is: 2.0 (unknown)
> usbus0: 5.0Gbps Super Speed USB v3.0
> usbus1: 12Mbps Full Speed USB v1.0
> ...
>
> end with a prompt on the console.  With today's kernel,
> boot is hung after the last pcm4: message and no usbus0
> is displayed.
>
> The booting kernel/system is a
>
> % uname -a
> FreeBSD 13.0-CURRENT #1 r354658: Wed Nov 13 11:23:32 PST 2019,  amd64
>
> Again, the failing kernel is r 355452

I think I have seen this on around r355101 already in case it helps 
narrowing things down.  I didn’t need USB and a few other things so I 
removed them from the kernel config, which helped.


/bz