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Date: Wed, 10 Aug 2016 17:41:39 +0300
From: Konstantin Belousov <kostikbel@gmail.com>
To: Matteo Riondato <matteo@FreeBSD.org>
Cc: FreeBSD Current <freebsd-current@freebsd.org>
Subject: Re: Signal 12 on make update (or any target in /usrc/src)
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On Wed, Aug 10, 2016 at 10:33:23AM -0400, Matteo Riondato wrote:
> Hi all,
> 
> I recently upgraded from a late June (pre 11-branch, as far as I can tell) revision to r303771.
> 
> Now, running ???make update??? (or buildworld, ???) in /usr/src fails with a signal 12:
> 
> matteo@triton:/usr/src$ sudo make update
> Password:
> *** Signal 12

You did not updated, I think.  You, most likely, inly updated the kernel,
but left the old userspace in place, at least libc.

Signal 12 is SIGSYS, which means that the program tries to use a syscall
not implemented by the kernel.  My guess is that your kernel lacks option
COMPAT_FREEBSD10, and the failing syscall is pipe(2).