toolchain/51009: userland segfaults on evbmips64el after import of compiler-rt r259194

[jdbaker%mylinuxisp.com@localhost]

>Number:         51009
>Category:       toolchain
>Synopsis:       userland segfaults on evbmips64el after import of compiler-rt r259194
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    toolchain-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Mar 24 19:25:00 +0000 2016
>Originator:     John D. Baker
>Release:        NetBSD/evbmips-mips64el 7.99.26 from 201602271909Z or later
>Organization:
>Environment:
NetBSD 7.99.26 evbmips mips64el
>Description:
As noted here:

  http://mail-index.netbsd.org/port-evbmips/2016/03/21/msg000257.html

I've traced the fault to the following series of commits:

  http://mail-index.NetBSD.org/source-changes/2016/02/27/msg072917.html
  http://mail-index.NetBSD.org/source-changes/2016/02/27/msg072918.html
  http://mail-index.NetBSD.org/source-changes/2016/02/27/msg072919.html
  http://mail-index.NetBSD.org/source-changes/2016/02/27/msg072920.html

"Import compiler-rt r259194."

Sources from 201602271858Z and earlier produce a "working" release
(modulo the persistent problems with NFS writes, 'amd' invalid argument,
and 'ntpd's complaint about the struct timex pointer).

Sources of 201602271909Z or later produce a release in which:

  mount_tmpfs
  ntpd
  ntpdate
  ftp
  progress
  sudo
  (others?)

fail with Segmentation fault/Memory fault.

The system is a Lemote Yeeloong netbook.
>How-To-Repeat:
S/A
>Fix: