segv in running rbx-1.4.1 specs

gistfile1.txt

The Rubinius process is aborting with signal: SIGSEGV
--- begin system info ---
sysname: Darwin
release: 13.4.0
version: Darwin Kernel Version 13.4.0: Sun Aug 17 19:50:11 PDT 2014; root:xnu-2422.115.4~1/RELEASE_X86_64
machine: x86_64
--- end system info ---
--- begin system backtrace ---
0   rbx                                 0x000000010c25eb72 _ZN8rubiniusL12segv_handlerEi + 354
1   libsystem_platform.dylib            0x00007fff8c5615aa _sigtramp + 26
2   ???                                 0x0000000000000000 0x0 + 0
3   rbx                                 0x000000010c38fb22 _ZN8rubinius16FinalizerHandler8finalizeEPNS_5StateE + 1778
4   rbx                                 0x000000010c38e391 _ZN8rubinius16FinalizerHandler7performEPNS_5StateE + 817
5   rbx                                 0x000000010c38e039 _ZN8rubinius23finalizer_handler_trampEPNS_5StateE + 41
6   rbx                                 0x000000010c3578cc _ZN8rubinius6Thread13in_new_threadEPv + 2972
7   libsystem_pthread.dylib             0x00007fff873a8899 _pthread_body + 138
8   libsystem_pthread.dylib             0x00007fff873a872a _pthread_struct_init + 0
9   libsystem_pthread.dylib             0x00007fff873acfc9 thread_start + 13
--- end system backtrace ---
--- begin Ruby backtraces ---
--- Thread 1 backtrace ---
IO.popen in kernel/common/io.rb:0 (+401)
__block__ in /Users/Sophia/devel/rbx-1.8.7/spec/ruby/core/io/popen_spec.rb:53 (+19)
Kernel#instance_eval in kernel/common/eval.rb:43 (+114)
MSpec.protect in /Users/Sophia/devel/rbx-1.8.7/mspec/lib/mspec/runner/mspec.rb:69 (+29)
__block__ in /Users/Sophia/devel/rbx-1.8.7/mspec/lib/mspec/runner/context.rb:179 (+25)
__block__ in kernel/common/enumerable.rb:215 (+203)
Array#each in kernel/bootstrap/array.rb:76 (+51 jit)
Enumerable#all? in kernel/common/enumerable.rb:215 (+10)
ContextState#protect in /Users/Sophia/devel/rbx-1.8.7/mspec/lib/mspec/runner/context.rb:179 (+41)