ffi callback segfault console output

segfault_console_output

waveOutOpen returns 0 (no error) if I don't use the callback form
0
but if I use a callback, the moment it returns from the callback, there is a seg fault
note that the code inside the callback runs, as I am puts-ing the mMsg which is 955
for WOM_OPEN which tells us the device was opened.
this is on ruby 1.9.3p484 (2013-11-22) [i386-mingw32] running 1.9.3 x86-mingw32 on
Windows 7
955
sound.rb:67: [BUG] Segmentation fault
ruby 1.9.3p484 (2013-11-22) [i386-mingw32]

-- Control frame information -----------------------------------------------
c:0004 p:---- s:0018 b:0018 l:000017 d:000017 CFUNC  :waveOutOpenCallback
c:0003 p:0282 s:0009 b:0008 l:001144 d:0023d4 EVAL   sound.rb:67
c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH
c:0001 p:0000 s:0002 b:0002 l:001144 d:001144 TOP

-- Ruby level backtrace information ----------------------------------------
sound.rb:67:in `<main>'
sound.rb:67:in `waveOutOpenCallback'

-- C level backtrace information -------------------------------------------
C:\Windows\SysWOW64\ntdll.dll(ZwWaitForSingleObject+0x15) [0x7721f8d1]
C:\Windows\syswow64\kernel32.dll(WaitForSingleObjectEx+0x43) [0x754f1194]
C:\Windows\syswow64\kernel32.dll(WaitForSingleObject+0x12) [0x754f1148]
C:\Ruby193\bin\msvcrt-ruby191.dll(rb_vm_bugreport+0xf9) [0x62e5cf51]
C:\Ruby193\bin\msvcrt-ruby191.dll(rb_name_err_mesg_new+0x17a) [0x62d3a862]
C:\Ruby193\bin\msvcrt-ruby191.dll(rb_bug+0x2f) [0x62d3b53f]
C:\Ruby193\bin\msvcrt-ruby191.dll(rb_check_safe_str+0x194) [0x62def0bc]
 [0x004011e6]
C:\Windows\syswow64\kernel32.dll(GetProfileStringW+0x12d67) [0x75530303]
C:\Windows\SysWOW64\ntdll.dll(RtlKnownExceptionFilter+0xb7) [0x772774ff]

-- Other runtime information -----------------------------------------------

* Loaded script: sound.rb

* Loaded features:

    0 enumerator.so
    1 C:/Ruby193/lib/ruby/1.9.1/i386-mingw32/enc/encdb.so
    2 C:/Ruby193/lib/ruby/1.9.1/i386-mingw32/enc/iso_8859_1.so
    3 C:/Ruby193/lib/ruby/1.9.1/i386-mingw32/enc/trans/transdb.so
    4 C:/Ruby193/lib/ruby/1.9.1/i386-mingw32/rbconfig.rb
    5 C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/compatibility.rb
    6 C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/defaults.rb
    7 C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/deprecate.rb
    8 C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/errors.rb
    9 C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/version.rb
   10 C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/requirement.rb
   11 C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/platform.rb
   12 C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/basic_specification.rb
   13 C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/stub_specification.rb
   14 C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/util/stringio.rb
   15 C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/specification.rb
   16 C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/exceptions.rb
   17 C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/defaults/operating_system.rb
   18 C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/core_ext/kernel_gem.rb
   19 C:/Ruby193/lib/ruby/1.9.1/thread.rb
   20 C:/Ruby193/lib/ruby/1.9.1/monitor.rb
   21 C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb
   22 C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems.rb
   23 C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/path_support.rb
   24 C:/Ruby193/lib/ruby/1.9.1/i386-mingw32/enc/utf_16le.so
   25 C:/Ruby193/lib/ruby/1.9.1/i386-mingw32/enc/trans/utf_16_32.so
   26 C:/Ruby193/lib/ruby/1.9.1/i386-mingw32/enc/trans/single_byte.so
   27 C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/dependency.rb
   28 C:/Ruby193/lib/ruby/gems/1.9.1/gems/ffi-1.9.3-x86-mingw32/lib/1.9/ffi_c.so
   29 C:/Ruby193/lib/ruby/gems/1.9.1/gems/ffi-1.9.3-x86-mingw32/lib/ffi/platform.rb
   30 C:/Ruby193/lib/ruby/gems/1.9.1/gems/ffi-1.9.3-x86-mingw32/lib/ffi/types.rb
   31 C:/Ruby193/lib/ruby/gems/1.9.1/gems/ffi-1.9.3-x86-mingw32/lib/ffi/library.rb
   32 C:/Ruby193/lib/ruby/gems/1.9.1/gems/ffi-1.9.3-x86-mingw32/lib/ffi/errno.rb
   33 C:/Ruby193/lib/ruby/gems/1.9.1/gems/ffi-1.9.3-x86-mingw32/lib/ffi/pointer.rb
   34 C:/Ruby193/lib/ruby/gems/1.9.1/gems/ffi-1.9.3-x86-mingw32/lib/ffi/memorypointer.rb
   35 C:/Ruby193/lib/ruby/gems/1.9.1/gems/ffi-1.9.3-x86-mingw32/lib/ffi/struct_layout_builder.rb
   36 C:/Ruby193/lib/ruby/gems/1.9.1/gems/ffi-1.9.3-x86-mingw32/lib/ffi/struct.rb
   37 C:/Ruby193/lib/ruby/gems/1.9.1/gems/ffi-1.9.3-x86-mingw32/lib/ffi/union.rb
   38 C:/Ruby193/lib/ruby/gems/1.9.1/gems/ffi-1.9.3-x86-mingw32/lib/ffi/managedstruct.rb
   39 C:/Ruby193/lib/ruby/gems/1.9.1/gems/ffi-1.9.3-x86-mingw32/lib/ffi/callback.rb
   40 C:/Ruby193/lib/ruby/gems/1.9.1/gems/ffi-1.9.3-x86-mingw32/lib/ffi/io.rb
   41 C:/Ruby193/lib/ruby/gems/1.9.1/gems/ffi-1.9.3-x86-mingw32/lib/ffi/autopointer.rb
   42 C:/Ruby193/lib/ruby/gems/1.9.1/gems/ffi-1.9.3-x86-mingw32/lib/ffi/variadic.rb
   43 C:/Ruby193/lib/ruby/gems/1.9.1/gems/ffi-1.9.3-x86-mingw32/lib/ffi/enum.rb
   44 C:/Ruby193/lib/ruby/gems/1.9.1/gems/ffi-1.9.3-x86-mingw32/lib/ffi/version.rb
   45 C:/Ruby193/lib/ruby/gems/1.9.1/gems/ffi-1.9.3-x86-mingw32/lib/ffi/ffi.rb
   46 C:/Ruby193/lib/ruby/gems/1.9.1/gems/ffi-1.9.3-x86-mingw32/lib/ffi.rb

[NOTE]
You may have encountered a bug in the Ruby interpreter or extension libraries.
Bug reports are welcome.
For details: http://www.ruby-lang.org/bugreport.html


This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.