segfault

I get the following segfault trying to run unit tests with travis-ci. This happens on 5.4, 5.5 and 5.6 - with 5.6 it segfaults immediately - with 5.4 and 5.5 it segfaults only after all unit tests have completed and phpunit is running code coverage report.
Program received signal SIGSEGV, Segmentation fault.
0x00007fffecc657bd in ev_io_stop (loop=0x0, w=0x7fffec2b1b58)
    at /home/travis/build/reactphp/event-loop/pecl-ev/libev/ev.c:3573
3573      wlist_del (&anfds[w->fd].head, (WL)w);
(gdb) #0  0x00007fffecc657bd in ev_io_stop (loop=0x0, w=0x7fffec2b1b58)
    at /home/travis/build/reactphp/event-loop/pecl-ev/libev/ev.c:3573
No locals.
#1  0x00007fffecc6a2bd in php_ev_watcher_free_storage (ptr=0x7fffec2b1b58, 
    tsrm_ls=<optimized out>)
    at /home/travis/build/reactphp/event-loop/pecl-ev/ev.c:511
        data = <optimized out>
---Type <return> to continue, or q <return> to quit---        w_next = <optimized out>
        w_prev = <optimized out>
        o_loop = <optimized out>
#2  0x00007fffecc6a7d2 in php_ev_io_free_storage (object=<optimized out>, 
    tsrm_ls=0x116e740)
    at /home/travis/build/reactphp/event-loop/pecl-ev/ev.c:557
        obj_ptr = 0x7fffec2b12a8
        ptr = <optimized out>
#3  0x00000000008cb0e9 in zend_objects_store_del_ref_by_handle_ex (handle=477, 
    handlers=<optimized out>, tsrm_ls=0x116e740)
    at /tmp/php-build/source/5.5.16/Zend/zend_objects_API.c:226
        __orig_bailout = 0x7fffffffd140
        __bailout = {{__jmpbuf = {140737159306816, -3891228727219796233, 0, 0, 
              18278000, 0, 3891226370839463671, -3891225379596744969}, 
            __mask_was_saved = 0, __saved_mask = {__val = {
                14555515346489755383, 8, 0, 18278000, 0, 3891226370831075063, 
                14555518694112806647, 0, 190, 18278208, 18271136, 18278208, 
                8551575, 0, 8551575, 24033592}}}}
        obj = 0x7fffebf4a778
        failure = <optimized out>
#4  0x00000000008cb11e in zend_objects_store_del_ref (zobject=0x7fffec631e40, 
    tsrm_ls=0x116e740)
    at /tmp/php-build/source/5.5.16/Zend/zend_objects_API.c:178
---Type <return> to continue, or q <return> to quit---        handle = <optimized out>
#5  0x000000000088c568 in _zval_dtor (zvalue=0x7fffec631e40)
    at /tmp/php-build/source/5.5.16/Zend/zend_variables.h:35
No locals.
#6  i_zval_ptr_dtor (zval_ptr=0x7fffec631e40)
    at /tmp/php-build/source/5.5.16/Zend/zend_execute.h:81
        tsrm_ls = <optimized out>
#7  _zval_ptr_dtor (zval_ptr=<optimized out>)
    at /tmp/php-build/source/5.5.16/Zend/zend_execute_API.c:426
No locals.
#8  0x00000000008ad728 in zend_hash_destroy (ht=0x7fffec62c408)
    at /tmp/php-build/source/5.5.16/Zend/zend_hash.c:560
        p = 0x0
        q = 0x7fffec647830
#9  0x000000000089c727 in _zval_dtor_func (zvalue=0x7fffec6384e8)
    at /tmp/php-build/source/5.5.16/Zend/zend_variables.c:45
        tsrm_ls = <optimized out>
#10 0x000000000088c568 in _zval_dtor (zvalue=0x7fffec6384e8)
    at /tmp/php-build/source/5.5.16/Zend/zend_variables.h:35
No locals.
#11 i_zval_ptr_dtor (zval_ptr=0x7fffec6384e8)
    at /tmp/php-build/source/5.5.16/Zend/zend_execute.h:81
        tsrm_ls = <optimized out>
---Type <return> to continue, or q <return> to quit---#12 _zval_ptr_dtor (zval_ptr=<optimized out>)
    at /tmp/php-build/source/5.5.16/Zend/zend_execute_API.c:426
No locals.
#13 0x00000000008c4397 in zend_object_std_dtor (object=0x7fffec647a28, 
    tsrm_ls=<optimized out>)
    at /tmp/php-build/source/5.5.16/Zend/zend_objects.c:54
        i = <optimized out>
#14 0x00000000008c43c9 in zend_objects_free_object_storage (
    object=0x7fffec647a28, tsrm_ls=<optimized out>)
    at /tmp/php-build/source/5.5.16/Zend/zend_objects.c:137
No locals.
#15 0x00000000008caa80 in zend_objects_store_free_object_storage (
    objects=0x1172240, tsrm_ls=0x116e740)
    at /tmp/php-build/source/5.5.16/Zend/zend_objects_API.c:97
        obj = <optimized out>
        i = <optimized out>
#16 0x000000000088d066 in shutdown_executor (tsrm_ls=0x116e740)
    at /tmp/php-build/source/5.5.16/Zend/zend_execute_API.c:293
        __orig_bailout = 0x7fffffffe910
        __bailout = {{__jmpbuf = {18271136, -3891225352665250057, 0, 0, 
              18278000, 0, 3891226371716073207, -3891225344167590153}, 
            __mask_was_saved = 0, __saved_mask = {__val = {
                14555518413069797111, 0, 8551575, 0, 8551575, 140737353872864, 
---Type <return> to continue, or q <return> to quit---                8850336, 140737353872912, 18292264, 1, 0, 0, 9028302, 
                18278208, 18270960, 0}}}}
#17 0x000000000089e2a7 in zend_deactivate (tsrm_ls=0x116e740)
    at /tmp/php-build/source/5.5.16/Zend/zend.c:935
No locals.
#18 0x000000000082d9cb in php_request_shutdown (dummy=<optimized out>)
    at /tmp/php-build/source/5.5.16/main/main.c:1808
        report_memleaks = 1 '\001'
        tsrm_ls = 0x116e740
#19 0x000000000095c9df in do_cli (argc=2, argv=0x116e600, tsrm_ls=0x116e740)
    at /tmp/php-build/source/5.5.16/sapi/cli/php_cli.c:1177
        c = <optimized out>
        file_handle = {type = ZEND_HANDLE_MAPPED, 
          filename = 0x116e670 "/home/travis/.phpenv/versions/5.5.16/bin/phpunit", opened_path = 0x0, handle = {fd = -134478488, fp = 0x7ffff7fc0568, 
            stream = {handle = 0x7ffff7fc0568, isatty = 0, mmap = {
                len = 3288776, pos = 0, map = 0x7fffec50f000, 
                buf = 0x7fffec50f013 "ertstringendswith", 
                old_handle = 0x16c49c0, 
                old_closer = 0x8b7380 <zend_stream_stdio_closer>}, 
              reader = 0x8b7490 <zend_stream_stdio_reader>, 
              fsizer = 0x8b73b0 <zend_stream_stdio_fsizer>, 
              closer = 0x8b7400 <zend_stream_mmap_closer>}}, 
---Type <return> to continue, or q <return> to quit---          free_filename = 0 '\000'}
        behavior = <optimized out>
        reflection_what = <optimized out>
        request_started = 1
        exit_status = 0
        php_optarg = 0x0
        php_optind = 2
        exec_direct = <optimized out>
        exec_run = <optimized out>
        exec_begin = <optimized out>
        exec_end = <optimized out>
        arg_free = <optimized out>
        arg_excp = <optimized out>
        script_file = <optimized out>
        translated_path = 0x16c4980 "/home/travis/.phpenv/versions/5.5.16/bin/phpunit"
        interactive = <optimized out>
        lineno = 2
        param_error = <optimized out>
        hide_argv = <optimized out>
#20 0x00000000004483f0 in main (argc=2, argv=0x116e600)
    at /tmp/php-build/source/5.5.16/sapi/cli/php_cli.c:1378
        __orig_bailout = 0x0
---Type <return> to continue, or q <return> to quit---        __bailout = {{__jmpbuf = {0, -3891226372462033161, 4490324, 0, 0, 0, 
              3891226371965634295, -3891225861343885577}, 
            __mask_was_saved = 0, __saved_mask = {__val = {33024, 0, 
                140737354130976, 4298858552, 0, 140737322489624, 4334086, 
                140737279250432, 140737351944052, 140733193388033, 0, 
                140737279318232, 140737351944052, 1, 9856560, 0}}}}
        tsrm_ls = 0x116e740
        c = <optimized out>
        exit_status = 0
        module_started = 1
        sapi_started = 1
        php_optarg = 0x0
        php_optind = 1
        use_extended_info = 0
        ini_path_override = 0x0
        ini_entries = 0x1170c50 "html_errors=0\nregister_argc_argv=1\nimplicit_flush=1\noutput_buffering=0\nmax_execution_time=0\nmax_input_time=-1\n"
        ini_entries_len = 0
        ini_ignore = 0
        sapi_module = <optimized out>
(gdb) quit
A debugging session is active.
Any assistance here is greatly appreciated.
Comments (19)
