What to do if USB stack seems dead

[Poul-Henning Kamp]

--------
In message <540B7AC4.9060504 at selasky.org>, Hans Petter Selasky writes:
>On 09/06/14 21:57, Maxim V FIlimonov wrote:
>> Lately, I've been heavily experimenting with different USB devices (for
>> instance, USB to TTL one, but that's another story), and at a moment I
>> encountered that the system doesn't react on new USB devices connected. The
>> connected devices work fine, though. The question is: what can I do in such a
>> case if I don't want to reboot my box?
>>
>
>Hi,
>
>If a TTY port is not closed, it will prevent other USB devices on that 
>particular USB controller from enumerating.

I'm pretty sure I have seen this "dead USB" thing on 

	FreeBSD ni.freebsd.dk 11.0-CURRENT FreeBSD 11.0-CURRENT #3 r270830:

without any USB/TTY ports being involved at all...

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.