Rhys Kidd 2424a2d347 Fix stack traces missing penultimate frame ...

bz#344560
- Also fixes memcheck/tests/badpoll test on OS X
- Problem occurs because the guest stack seen in a system call pre or post
  function happens to not have a correct topmost stack frame, as Darwin system
  call stubs do not start with the usual function prolog.
- New regression test case added.
- Thanks to Greg Banks for research, patch and test case.

Before:

== 587 tests, 240 stderr failures, 22 stdout failures, 0 stderrB failures, 0 stdoutB failures, 31 post failures ==

After:

== 588 tests, 239 stderr failures, 22 stdout failures, 0 stderrB failures, 0 stdoutB failures, 31 post failures ==

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14985

2015-03-07 05:22:12 +00:00

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