toolchain/49236: lib/csu/t_crt0/initfini3 test case failing on amd64

[gson%gson.org@localhost (Andreas Gustafsson)]

>Number:         49236
>Category:       toolchain
>Synopsis:       lib/csu/t_crt0/initfini3 test case failing on amd64
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    toolchain-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Sep 24 12:45:01 +0000 2014
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current, source date >= 2014.03.11.23.22.36
>Organization:

>Environment:
System: NetBSD
Architecture: amd64
Machine: x86_64
>Description:

The lib/csu/t_crt0/initfini3 test case has been consistently failing
on amd64 since it was switched to gcc 4.8 by Christos' commit of
src/share/mk/bsd.own.mk 1.784 on 2014-03-11 23:22:36.

The tests fails both under qemu and on real hardware. It passes on
i386 and sparc.

Log output from a recent run is at:

  http://releng.netbsd.org/b5reports/amd64/build/2014.09.23.13.48.04/test.html#lib_csu_t_crt0_initfini3

Standard error stream copied from the above:

  constructor executed
  main started
  constructor2 executed
  main after dlopen
  destructor2 executed
  stack unaligned 
  destructor executed
  stack unaligned 

>How-To-Repeat:

Run the ATF tests on amd64.

>Fix: