Re: "*** [kernel.debug] Error code 139"?

On Thu, Jan 08, 2015 at 02:06:16PM +0000, Bjoern A. Zeeb wrote:
> 
> > On 08 Jan 2015, at 13:37 , markj_at_FreeBSD.org wrote:
> > 
> > On Thu, Jan 08, 2015 at 01:40:11PM +0100, Dimitry Andric wrote:
> >> On 08 Jan 2015, at 13:09, Bjoern A. Zeeb <bzeeb-lists_at_lists.zabbadoz.net> wrote:
> >>> 
> >>>> On 07 Jan 2015, at 15:02 , Bjoern A. Zeeb <bzeeb-lists_at_lists.zabbadoz.net> wrote:
> >>>>> On 07 Jan 2015, at 14:13 , Ed Maste <emaste_at_freebsd.org> wrote:
> >>>>> On 7 January 2015 at 08:57, David Wolfskill <david_at_catwhisker.org> wrote:
> >>>>>> --- kernel.debug ---
> >>>>>> linking kernel.debug
> >>>>>> ctfmerge -L VERSION -g -o kernel.debug ...
> >>>>>> Segmentation fault (core dumped)
> >>>>>> *** [kernel.debug] Error code 139
> >>>>> ...
> >>>>>> I'm mostly wondering what "Error code 139" is intended to mean.... :-}
> >>>>> 
> >>>>> It's the way termination due to a signal is reported. The exit status
> >>>>> is 128 + the signal number and SIGSEGV = 11.
> >>>> 
> >>>> I did see it twice last night while doing HEAD builds, and i386.GENERIC only.  For later builds it was just gone again.  Not sure if anyone wants to figure out what was special about the two SVN revisions.   For me it was a cross-build from amd64 as part of make universe.
> >>> 
> >>> Ok, this continues;  I have since seen it four more times.  Still i386.GENERIC only; none of the LINT kernels or other architectures.
> >>> 
> >>> Can someone please investigate what triggers this?
> >> 
> >> Looks like a stack overflow, cause unknown as of yet:
> > 
> > I'll try to reproduce this, but perhaps try reverting r274569? r274565
> > and r274564 could also potentially be the cause of this, but r274569
> > would be my first guess.
> 
> It only started 2 nights ago and we are both doing daily builds.  Unlikely that stuff from November would do it oh so suddenly.

Unlikely, but possible. r274569 modified the termination conditions for
the equiv_node() recursion that dim_at_ posted, so it's definitely
relevant.

> 
> It’s hard to exactly narrow it down as there was a lot of other breakage in the tree but I know that r276729 finished a full universe and I hadn’t noticed the problem before.  So I would almost assume it was something after that (but obviously it could be a combination of things).
> 
> /bz
> 
> — 
> Bjoern A. Zeeb                                  Charles Haddon Spurgeon:
> "Friendship is one of the sweetest joys of life.  Many might have failed
>  beneath the bitterness of their trial  had they not found a friend."
>