ino64? r318606 -> r318739 OK; r318739 -> r318781 fails SIGSEGV

[David Wolfskill]

On Wed, May 24, 2017 at 02:10:08PM +0200, Dimitry Andric wrote:
> ...
> > building special pic c library
> > --- libc.so.7 ---
> > cc: error: unable to execute command: Segmentation fault (core dumped)
> > cc: error: linker command failed due to signal (use -v to see invocation)
> > *** [libc.so.7] Error code 254
> 
> Looks like your linker is crashing.  Can you figure out:
> 1) The exact linker command being run
> 2) The path to the linker executable that crashes
> 3) Backtrace of the crash
> 
> -Dimitry
> 

On Wed, May 24, 2017 at 03:10:33PM +0300, Konstantin Belousov wrote:
> ...
> 
> If you perform build of r318739 on r318739 (i.e. build of the same sources
> as installed on your machine), does the SIGSEGV occur ?
> 
> Anyway, get the core file loaded into gdb and get the backtrace, at least.

Sorry for the delay; I'm way out of practice with using a debugger...
and I see that gdb isn't in head now.  lldb tells me:

(lldb) bt
* thread #1, name = 'ld', stop reason = signal SIGSEGV
  * frame #0: 0x0000000000000000
(lldb) 

which isn't entirely unexpected, I suppose, given the nature of SIGSEGV.

On the build machine, I "cloned" slice 4 to slice 3, then rebooted it
from slice 3, "updated" /usr/src to r318739 and told it to go build
itself (while I continued poking at my laptop).  The build machine has
not yet completed the ">>> stage 4.2: building libraries" step -- recall
that I had performed a "make clean" before cloning... -- but it has got
quite a bit beyond the previous point of failure (still building clang).

I have copied the ld.core and libc.so.7.meta files from the build
machine to <http://www.catwhisker.org/~david/FreeBSD/head/r318781/> (and
made gzipped copies, as well).

As far as I can tell, the "ld" command was:
freebeast(12.0-C)[10] ls -lT `which ld`
-r-xr-xr-x  2 root  wheel  1706336 May 23 05:29:59 2017 /usr/bin/ld

This, from:
FreeBSD freebeast.catwhisker.org 12.0-CURRENT FreeBSD 12.0-CURRENT #352  r318739M/318739:1200031: Tue May 23 05:16:24 PDT 2017     root at freebeast.catwhisker.org:/common/S4/obj/usr/src/sys/GENERIC  amd64

Late note: ">>> stage 4.2: building libraries" has completed on the
build machine (building r318739 while running r318739).

I apologize for not getting all the information you (both) requested, but
thought it best to provisde what I can (sooner).

Peace,
david
-- 
David H. Wolfskill				david at catwhisker.org
"[T]he president’s improper efforts to influence an ongoing investigation"

See http://www.catwhisker.org/~david/publickey.gpg for my public key.
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