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Date: Fri, 15 Apr 2016 13:50:55 +0300
From: Konstantin Belousov <kostikbel@gmail.com>
To: Vladimir Zakharov <zakharov.vv@gmail.com>
Cc: freebsd-current@freebsd.org
Subject: Re: GENERIC-NODEBUG panics, GENERIC does not
Message-ID: <20160415105055.GI2422@kib.kiev.ua>
References: <20160415102644.GA1380@vzakharov>
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On Fri, Apr 15, 2016 at 01:26:44PM +0300, Vladimir Zakharov wrote:
> Hello
> 
> Setting 'kern.eventtimer.periodic = 1' in /etc/sysctl.conf leads to
> GENERIC-NODEBUG panic. GENERIC loads without problems.
> So do GENERIC-NODEBUG as of r297245.
> 
> https://imgur.com/0DtDU3m
> 
> $ uname -a
> 
> FreeBSD vzakharov 11.0-CURRENT FreeBSD 11.0-CURRENT #4 r298037: Fri Apr
> 15 12:27:40 MSK 2016 root@vzakharov:/home/obj/usr/src/sys/GENERIC-NODEBUG  amd64
> 

I cannot reproduce it locally.
Please provide me verbose dmesg from the successfull boot on your machine.
Also, for the panic, show me the output of the same data as on the
screenshot and the output of 'show registers'.
Also please load your kernel into kgdb and do
list *lapic_et_start+0x281