Rubinius FFI Callback deadlock

GDB Output

(gdb) bt
#0  0x00007fff8471cf8a in __semwait_signal ()
#1  0x00007fff84720da1 in _pthread_cond_wait ()
#2  0x0000000100028632 in rubinius::GlobalLock::take (this=0x101006208) at thread.hpp:405
#3  0x000000010013a35e in rubinius::NativeFunction::call (this=0x101a3ad60, state=0x100f06280, args=@0x7fff5fbfb580, msg=<value temporarily unavailable, due to optimizations>, call_frame=0x7fff5fbfb630) at vm/builtin/nativefunction.cpp:1013
#4  0x000000010013b197 in rubinius::NativeFunction::execute (state=0x100f06280, call_frame=0x7fff5fbfb630, msg=@0x102e5bcf0, args=@0x7fff5fbfb580) at vm/builtin/nativefunction.cpp:86
#5  0x00000001000375a0 in rubinius::VMMethod::interpreter (state=0x100f06280, vmm=0x102ea9960, call_frame=0x7fff5fbfb630) at instruction_implementations.hpp:526
#6  0x0000000100115e1f in rubinius::VMMethod::execute_specialized<rubinius::OneArgument> (state=0x100f06280, previous=0x7fff5fbfba90, msg=@0x10143b500, args=@0x7fff5fbfb9e0) at vm/vmmethod.cpp:615
#7  0x0000000100120cdb in rubinius::CompiledMethod::default_executor (state=0x100f06280, call_frame=0x7fff5fbfba90, msg=@0x10143b500, args=@0x7fff5fbfb9e0) at vm/builtin/compiledmethod.cpp:156
#8  0x00000001000375a0 in rubinius::VMMethod::interpreter (state=0x100f06280, vmm=0x102ac0d10, call_frame=0x7fff5fbfba90) at instruction_implementations.hpp:526
#9  0x0000000100114990 in rubinius::VMMethod::execute_specialized<rubinius::NoArguments> (state=0x100f06280, previous=0x7fff5fbfbfb0, msg=@0x7fff5fbfbc90, args=@0x7fff5fbfbf00) at vm/vmmethod.cpp:615
#10 0x0000000100120cdb in rubinius::CompiledMethod::default_executor (state=0x100f06280, call_frame=0x7fff5fbfbfb0, msg=@0x7fff5fbfbc90, args=@0x7fff5fbfbf00) at vm/builtin/compiledmethod.cpp:156
#11 0x00000001001410b1 in rubinius::Object::send_prim (this=0x101b0ffa8, state=0x100f06280, exec=<value temporarily unavailable, due to optimizations>, call_frame=0x7fff5fbfbfb0, msg=<value temporarily unavailable, due to optimizations>, args=@0x7fff5fbfbf00) at vm/builtin/object.cpp:525
#12 0x00000001000b58fb in rubinius::Primitives::object_send (state=0x100f06280, call_frame=0x7fff5fbfbfb0, msg=@0x102abcf10, args=@0x7fff5fbfbf00) at primitives_glue.gen.cpp:21276
#13 0x00000001000375a0 in rubinius::VMMethod::interpreter (state=0x100f06280, vmm=0x102abc8a0, call_frame=0x7fff5fbfbfb0) at instruction_implementations.hpp:526
#14 0x0000000100115e1f in rubinius::VMMethod::execute_specialized<rubinius::OneArgument> (state=0x100f06280, previous=0x7fff5fbfc410, msg=@0x102abc6f0, args=@0x7fff5fbfc360) at vm/vmmethod.cpp:615
#15 0x0000000100120cdb in rubinius::CompiledMethod::default_executor (state=0x100f06280, call_frame=0x7fff5fbfc410, msg=@0x102abc6f0, args=@0x7fff5fbfc360) at vm/builtin/compiledmethod.cpp:156
#16 0x00000001000375a0 in rubinius::VMMethod::interpreter (state=0x100f06280, vmm=0x102abc180, call_frame=0x7fff5fbfc410) at instruction_implementations.hpp:526
#17 0x0000000100114dfb in rubinius::VMMethod::execute_specialized<rubinius::GenericArguments> (state=0x100f06280, previous=0x7fff5fbfc890, msg=@0x10142ac80, args=@0x7fff5fbfc7e0) at vm/vmmethod.cpp:615
#18 0x0000000100120cdb in rubinius::CompiledMethod::default_executor (state=0x100f06280, call_frame=0x7fff5fbfc890, msg=@0x10142ac80, args=@0x7fff5fbfc7e0) at vm/builtin/compiledmethod.cpp:156
#19 0x00000001000375a0 in rubinius::VMMethod::interpreter (state=0x100f06280, vmm=0x102ab9fc0, call_frame=0x7fff5fbfc890) at instruction_implementations.hpp:526
#20 0x0000000100114990 in rubinius::VMMethod::execute_specialized<rubinius::NoArguments> (state=0x100f06280, previous=0x7fff5fbfcd00, msg=@0x103009e00, args=@0x7fff5fbfcc50) at vm/vmmethod.cpp:615
#21 0x0000000100120cdb in rubinius::CompiledMethod::default_executor (state=0x100f06280, call_frame=0x7fff5fbfcd00, msg=@0x103009e00, args=@0x7fff5fbfcc50) at vm/builtin/compiledmethod.cpp:156
#22 0x0000000100035feb in rubinius::VMMethod::interpreter (state=0x100f06280, vmm=0x102b05d00, call_frame=0x7fff5fbfcd00) at instruction_implementations.hpp:507
#23 0x0000000100114990 in rubinius::VMMethod::execute_specialized<rubinius::NoArguments> (state=0x100f06280, previous=0x7fff5fbfd180, msg=@0x103006600, args=@0x7fff5fbfd0d0) at vm/vmmethod.cpp:615
#24 0x0000000100120cdb in rubinius::CompiledMethod::default_executor (state=0x100f06280, call_frame=0x7fff5fbfd180, msg=@0x103006600, args=@0x7fff5fbfd0d0) at vm/builtin/compiledmethod.cpp:156
#25 0x00000001000375a0 in rubinius::VMMethod::interpreter (state=0x100f06280, vmm=0x102b047a0, call_frame=0x7fff5fbfd180) at instruction_implementations.hpp:526
#26 0x0000000100114990 in rubinius::VMMethod::execute_specialized<rubinius::NoArguments> (state=0x100f06280, previous=0x7fff5fbfd600, msg=@0x102b023b0, args=@0x7fff5fbfd550) at vm/vmmethod.cpp:615
#27 0x0000000100120cdb in rubinius::CompiledMethod::default_executor (state=0x100f06280, call_frame=0x7fff5fbfd600, msg=@0x102b023b0, args=@0x7fff5fbfd550) at vm/builtin/compiledmethod.cpp:156
#28 0x00000001000375a0 in rubinius::VMMethod::interpreter (state=0x100f06280, vmm=0x102b01b90, call_frame=0x7fff5fbfd600) at instruction_implementations.hpp:526
#29 0x0000000100114990 in rubinius::VMMethod::execute_specialized<rubinius::NoArguments> (state=0x100f06280, previous=0x0, msg=@0x7fff5fbfd820, args=@0x7fff5fbfd7f0) at vm/vmmethod.cpp:615
#30 0x0000000100120cdb in rubinius::CompiledMethod::default_executor (state=0x100f06280, call_frame=0x0, msg=@0x7fff5fbfd820, args=@0x7fff5fbfd7f0) at vm/builtin/compiledmethod.cpp:156
#31 0x000000010001ed0f in rubinius::CompiledFile::execute (this=<value temporarily unavailable, due to optimizations>, state=0x100f06280) at vm/compiled_file.cpp:51
#32 0x000000010002211c in rubinius::Environment::run_file (this=0x7fff5fbfdf10, file=@0x7fff5fbfde90) at vm/environment.cpp:451
#33 0x0000000100024e5c in std::string::_M_rep () at /usr/include/c++/4.2.1/bits/basic_string.h:597
#34 0x0000000100024e5c in ~basic_string [inlined] () at vm/environment.cpp:493
#35 ~basic_string [inlined] () at /usr/include/c++/4.2.1/bits/basic_string.h:493
#36 0x0000000100024e5c in rubinius::Environment::run_from_filesystem (this=0x7fff5fbfdf10, root=@0x7fff5fbfe490) at vm/environment.cpp:597
#37 0x00000001001bdb16 in std::string::_M_rep () at /usr/include/c++/4.2.1/bits/basic_string.h:50
#38 0x00000001001bdb16 in ~basic_string [inlined] () at vm/drivers/cli.cpp:493
#39 ~basic_string [inlined] () at /usr/include/c++/4.2.1/bits/basic_string.h:493
#40 0x00000001001bdb16 in main (argc=<value temporarily unavailable, due to optimizations>, argv=<value temporarily unavailable, due to optimizations>) at vm/drivers/cli.cpp:50
(gdb) 

Output

➜ ruby test.rb 
run with callback
callback
[now the process just hangs, ^C doesn't work, so I have to manually kill the process]
^C^C^C^C^C^CTerminated: signal SIGTERM

test.c

// Compile with: gcc -dynamiclib -o test.dylib test.c

#include <stdio.h>
#include <stdlib.h>

typedef void (*test_callback) (void);

void run_with_callback(test_callback cb) {
  cb();
}

test.rb

require 'ffi'
class FFITest
  extend ::FFI::Library
  ffi_lib File.expand_path("../test.dylib", __FILE__)

  callback :cb, [], :void
  attach_function 'run_with_callback', [:cb], :void

  def initialize(cb)
    run_with_callback(cb)
  end
end

cb = proc {
  puts "callback"
}
puts "run with callback"
FFITest.new(cb)
puts "done"