USB causing boot to hang

[Steve Kargl]

On Fri, Dec 06, 2019 at 09:32:01PM +0000, Bjoern A. Zeeb wrote:
> 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.

Yes, it's in that neighborhood.  I'm in the middle of a binary search
for the commit.  Fortunately, there is only about 1000 commits between
my last good kernel and the failing one.

-- 
Steve