freebsd stable - Apr 2018 - FreeBSD 10.4 kernel breaks on i7-7700 / PRIME H270M-PLUS

02.04.2018 5:00, Mark Knight wrote:
> I'm trying to do the usual src code upgrade from FreeBSD 10.3 to 10.4,
as I've done many times before with earlier version bumps.
> 
> However, for some reason the 10.4 kernel seems to break my system, either
with the 10.3 or 10.4 userland.
> 
> The main issue seems to be some sort of deadlock.
> For example, on the console, following boot (which seems fairly normal)
> I can login to the console as root, but when I try to use commands like
> su or sudo to switch to another user, that command hangs and at that point
CTRL-C is useless:
> I have to switch to another tty.
What does it show if you press "CTRL-T" to see a status of
"hung" process?

Does it help if you comment out the line mentioning /dev/console in the
/etc/syslog.conf
and apply the change with killall -1 syslogd ?

On 02/04/2018 06:56, Eugene Grosbein wrote:
> What does it show if you press "CTRL-T" to see a status of
"hung" process?
Typically CTRL-T shows [sysctl mem]. In some circumstances I can CTRL-C 
(e.g. if su hangs), in others I cannot (e.g. with sudo).
> Does it help if you comment out the line mentioning /dev/console in the
/etc/syslog.conf
> and apply the change with killall -1 syslogd ?
Doing that "killall -HUP syslogd" hangs with (sysctl mem) - as does 
"service syslogd restart" but after a fresh reboot, no - removing that
line didn't help at all. Thanks for getting my hopes up :)

Moving ~/myuser/.bashrc out of the way (it really doesn't contain much 
apart from setting a bunch of aliases), allows me to login as myself, 
but "sudo -u myuser -s" still hangs.

I just got a truss output of "sudo -u myuser -s" per the file below, 
perhaps that contains a clue?

# sudo -u myuser -s >& sudo.truss.log

	http://www.knigma.org/scratch/sudo.truss.log

Flipping back to a 10.3 kernel makes everything happy (just as well, as 
the machine in question is my main router/firewall, so it's a right pain 
when it's not working).

Thanks in advance for any fresh ideas; I'm really not sure where to go 
with this!
-- 
Mark Knight