[Bug 194828] [test] lib.libc.sys.getcontext_test.setcontext_link fails on amd64, not i386

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194828

--- Comment #5 from commit-hook at freebsd.org ---
A commit references this bug:

Author: ngie
Date: Wed Nov  5 16:38:57 UTC 2014
New revision: 274143
URL: https://svnweb.freebsd.org/changeset/base/274143

Log:
  Expect lib.libc.sys.getcontext_test.setcontext_link to fail on amd64; add
  additional debugging to make the underlying problem more visible

  Calling setcontext(2) on amd64 as shown in the test program is failing on
  amd64, not i386, with a return code of -1 and an errno of EINVAL

  Further investigation is being done in the PR to determine the root cause for
  the failure

  PR: 194828
  Tested with the following configuration:
  - amd64/i386
  - 11.0-CURRENT @ r273153
  - 100 times in a tight loop as root with the following commands...
  -- kyua test lib/libc
  -- kyua test lib/libc/sys
  -- kyua test lib/libc/sys/getcontext_test

Changes:
  head/contrib/netbsd-tests/lib/libc/sys/t_getcontext.c

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