gdb --args php test.php
GNU gdb (Debian 8.2.1-2+b3) 8.2.1
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Reading symbols from php...(no debugging symbols found)...done.
(gdb) run
Starting program: /usr/local/bin/php test.php
warning: Error disabling address space randomization: Operation not permitted
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

Program received signal SIGSEGV, Segmentation fault.
__strlen_avx2 () at ../sysdeps/x86_64/multiarch/strlen-avx2.S:65
65      ../sysdeps/x86_64/multiarch/strlen-avx2.S: No such file or directory.
(gdb) bt full
#0  __strlen_avx2 () at ../sysdeps/x86_64/multiarch/strlen-avx2.S:65
No locals.
#1  0x00005579afbb3c10 in ?? ()
No symbol table info available.
#2  0x00005579afbb48cb in ?? ()
No symbol table info available.
#3  0x00005579afbb4a6d in ap_php_vsnprintf ()
No symbol table info available.
#4  0x00007fdf9b71a46b in xdebug_sprintf (fmt=fmt@entry=0x7fdf9b73bbd5 ":%s:%d-%d}")
    at /tmp/pear/temp/xdebug/src/lib/str.c:215
        n = <optimized out>
        new_str = 0x5579b24a2bc0 ":"
        size = 32
        args = {{gp_offset = 16, fp_offset = 48, overflow_arg_area = 0x7fff1e7b6e00, reg_save_area = 0x7fff1e7b6d20}}
#5  0x00007fdf9b718358 in xdebug_wrap_closure_location_around_function_name (opa=0x7fdf9b8667b8,
    fname=0x5579b23692e8 "newInstanceWithoutConstructor") at /tmp/pear/temp/xdebug/src/lib/lib.c:598
        tmp = {l = 28, a = 1052, d = 0x5579b24a2bf0 "newInstanceWithoutConstructo"}
        tmp_loc_info = <optimized out>
#6  0x00007fdf9b712dd1 in xdebug_build_fname (tmp=tmp@entry=0x5579b24a3e50, edata=edata@entry=0x7fdf9b81d130)
    at /tmp/pear/temp/xdebug/src/base/base.c:264
No locals.
#7  0x00007fdf9b713029 in xdebug_add_stack_frame (zdata=<optimized out>, zdata@entry=0x7fdf9b81d130,
    op_array=0x7fdf9b8667b8, type=type@entry=0) at /tmp/pear/temp/xdebug/src/base/base.c:637
        edata = 0x7fdf9b81d130
        opline_ptr = 0x7fdf9b81d130
        tmp = 0x5579b24a3e50
        cur_opcode = <optimized out>
#8  0x00007fdf9b713edb in xdebug_execute_internal (current_execute_data=0x7fdf9b81d130, return_value=0x7fdf9b81d110)
    at /tmp/pear/temp/xdebug/src/base/base.c:888
--Type <RET> for more, q to quit, c to continue without paging--c
        edata = <optimized out>
        fse = <optimized out>
        function_nr = 0
        function_call_traced = 0
        restore_error_handler_situation = 0
        tmp_error_cb = 0x0
#9  0x00005579afc95612 in execute_ex ()
No symbol table info available.
#10 0x00007fdf9b713801 in xdebug_execute_ex (execute_data=0x7fdf9b81d030) at /tmp/pear/temp/xdebug/src/base/base.c:801
        op_array = 0x7fdf9b890260
        edata = <optimized out>
        fse = 0x5579b24a3d90
        function_nr = 0
        code_coverage_function_name = 0x0
        code_coverage_filename = 0x0
        code_coverage_init = 0
#11 0x00005579afc976a2 in zend_execute ()
No symbol table info available.
#12 0x00005579afc113b3 in zend_execute_scripts ()
No symbol table info available.
#13 0x00005579afbb2548 in php_execute_script ()
No symbol table info available.
#14 0x00005579afc99bfe in ?? ()
No symbol table info available.
#15 0x00005579af866fdc in ?? ()
No symbol table info available.
#16 0x00007fdf9e82f09b in __libc_start_main (main=0x5579af866b50, argc=2, argv=0x7fff1e7baa08, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff1e7ba9f8) at ../csu/libc-start.c:308
        self = <optimized out>
        result = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, -9047746716087511225, 93981124228752, 140733704808960, 0, 0, -2926617175082559673, -2944350448894372025}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x7fff1e7baa20, 0x7fdf9f471190}, data = {prev = 0x0, cleanup = 0x0, canceltype = 511420960}}}
        not_first_call = <optimized out>
#17 0x00005579af8676ba in _start ()
No symbol table info available.