Re: latest current fails to boot.

On Sat, 25 Sep 2021 23:46:48 +0300
Andriy Gapon <avg@FreeBSD.org> wrote:

> On 25/09/2021 19:10, Johan Hendriks wrote:
> > For me i had kern.sched.steal_thresh=1 in my sysctl as i use this machine mainly 
> > for tests and so on.
> > By removing this sysctl the system boots again. I already used the latest 
> > snapshot and that booted fine.
> 
> Might have something to do with
> https://cgit.FreeBSD.org/src/commit/?id=bd84094a51c4648a7c97ececdaccfb30bc832096
> 
> -- 
> Andriy Gapon

Commenting out kern.sched.steal_thresh=0 line in /etc/sysctl.conf let
me boot fine. No other setting of kern.sched.* affected.
I've introduced the setting by reading posts [1] and [2] on
freebsd-current ML. Thanks for the hint, Jan!

Andriy, I took time to bi-sect and determined the commit triggered
this issue was e745d729be60. [3]
Worked OK even with kern.sched.steal_thresh=0 at a342ecd326ee. [4]

Tested commits are as below (tested order, not using git bisect):
 0b79a76f8487: [Known to be OK]
 8db1669959ce: [Problematic rev I first encountered]
 0f6829488ef3: OK
 df8dd6025af8: OK
 4f917847c903: OK
 e745d729be60: NG!
 bd84094a51c4: OK
 a342ecd326ee: OK

Konstantin, no more chance to get into ddb on hang up until my previous
post. ^T never worked on hang up situation. Sory. But does info above
help?


[1]
https://lists.freebsd.org/pipermail/freebsd-current/2021-March/079237.html

[2]
https://lists.freebsd.org/pipermail/freebsd-current/2021-March/079240.html

[3]
https://lists.freebsd.org/pipermail/dev-commits-src-main/2021-September/007513.html

[4]
https://lists.freebsd.org/pipermail/dev-commits-src-main/2021-September/007512.html

-- 
Tomoaki AOKI    <junchoon@dec.sakura.ne.jp>