Can you try Xdebug 2.4.0 which got released yesterday please? And if you disable opcache - does that change things?

Yeah. I've disabled Opcache and installed Xdebug 2.4.0. Currently tests run, but I got "Segmentation fault" after several tests were performed

gdb output
PHPUnit 5.2.10 by Sebastian Bergmann and contributors.

...
Program received signal SIGSEGV, Segmentation fault.
__strcmp_ssse3 () at ../sysdeps/i386/i686/multiarch/strcmp-ssse3.S:240

That crash looks like a different location though. Can you please post the full output in GDB, and also run "bt full" on the GDB prompt?

It is likely that I am going to need a reproducible case though. Something that I can download and run - including the steps on how to run things. A Git clone, or a tarball (.tgz file) both work.

Yeah.

PHPUnit 5.2.10 by Sebastian Bergmann and contributors.

...
Program received signal SIGSEGV, Segmentation fault.
__strcmp_ssse3 () at ../sysdeps/i386/i686/multiarch/strcmp-ssse3.S:240
240 ../sysdeps/i386/i686/multiarch/strcmp-ssse3.S: No such file or directory.
(gdb) bt full
#0 __strcmp_ssse3 () at ../sysdeps/i386/i686/multiarch/strcmp-ssse3.S:240
No locals.
#1 0xb75d3b0d in xdebug_branch_info_mark_end_of_function_reached (
filename=filename@entry=0x10 <error: Cannot access memory at address 0x10>, function_name=function_name@entry=0x80c909f8 "{main}",
key=0x0, key_len=0) at /home/vagrant/xdebug-2.4.0/xdebug_branch_info.c:417
file = 0x80379580
function = 0x0
branch_info = <optimized out>
path = 0xb75d3ae8 <xdebug_branch_info_mark_end_of_function_reached+8>
0000002 0xb75d669d in xdebug_code_coverage_end_of_function (op_array=0xb24a3d20) at /home/vagrant/xdebug-2.4.0/xdebug_code_coverage.c:1003
str = {l = 0, a = 0, d = 0x0}
path = 0x80b65588
file = 0x10 <error: Cannot access memory at address 0x10>
func_info = {class = 0x0, function = 0x80c94790 "\250P\312\200n}", type = 1, internal = 0}
function_name = 0x80c909f8 "{main}"
0000003 0xb75d0028 in xdebug_execute_ex (execute_data=0xb761b300) at /home/vagrant/xdebug-2.4.0/xdebug.c:1895
op_array = <optimized out>
edata = <optimized out>
dummy = <optimized out>
fse = <optimized out>
xfse = <optimized out>
magic_cookie = <optimized out>
do_return = <optimized out>
function_nr = <optimized out>
le = <optimized out>
0000004 0x80276187 in ?? ()
No symbol table info available.
0000005 0x802814e6 in ?? ()
No symbol table info available.
0000006 0x8023473a in execute_ex ()
No symbol table info available.
0000007 0x801e805d in dtrace_execute_ex ()
No symbol table info available.
0000008 0xb75cfeb0 in xdebug_execute_ex (execute_data=0xb761b100) at /home/vagrant/xdebug-2.4.0/xdebug.c:1890
op_array = <optimized out>
edata = <optimized out>
dummy = <optimized out>
fse = <optimized out>
---Type <return> to continue, or q <return> to quit---

You didn't type <return> to show the rest of it - and a reproducible case is likely still going to be needed.

Oh sorry, This is all output

PHPUnit 5.2.10 by Sebastian Bergmann and contributors.

...
Program received signal SIGSEGV, Segmentation fault.
__strcmp_ssse3 () at ../sysdeps/i386/i686/multiarch/strcmp-ssse3.S:240
240 ../sysdeps/i386/i686/multiarch/strcmp-ssse3.S: No such file or directory.
(gdb) bt full
#0 __strcmp_ssse3 () at ../sysdeps/i386/i686/multiarch/strcmp-ssse3.S:240
No locals.
#1 0xb75d3b0d in xdebug_branch_info_mark_end_of_function_reached (
filename=filename@entry=0x10 <error: Cannot access memory at address 0x10>, function_name=function_name@entry=0x80c909f8 "{main}",
key=0x0, key_len=0) at /home/vagrant/xdebug-2.4.0/xdebug_branch_info.c:417
file = 0x80379580
function = 0x0
branch_info = <optimized out>
path = 0xb75d3ae8 <xdebug_branch_info_mark_end_of_function_reached+8>
0000002 0xb75d669d in xdebug_code_coverage_end_of_function (op_array=0xb24a3d20) at /home/vagrant/xdebug-2.4.0/xdebug_code_coverage.c:1003
str = {l = 0, a = 0, d = 0x0}
path = 0x80b65588
file = 0x10 <error: Cannot access memory at address 0x10>
func_info = {class = 0x0, function = 0x80c94790 "\250P\312\200n}", type = 1, internal = 0}
function_name = 0x80c909f8 "{main}"
0000003 0xb75d0028 in xdebug_execute_ex (execute_data=0xb761b300) at /home/vagrant/xdebug-2.4.0/xdebug.c:1895
op_array = <optimized out>
edata = <optimized out>
dummy = <optimized out>
fse = <optimized out>
xfse = <optimized out>
magic_cookie = <optimized out>
do_return = <optimized out>
function_nr = <optimized out>
le = <optimized out>
0000004 0x80276187 in ?? ()
No symbol table info available.
0000005 0x802814e6 in ?? ()
No symbol table info available.
0000006 0x8023473a in execute_ex ()
No symbol table info available.
0000007 0x801e805d in dtrace_execute_ex ()
No symbol table info available.
0000008 0xb75cfeb0 in xdebug_execute_ex (execute_data=0xb761b100) at /home/vagrant/xdebug-2.4.0/xdebug.c:1890
op_array = <optimized out>
edata = <optimized out>
dummy = <optimized out>
fse = <optimized out>
---Type <return> to continue, or q <return> to quit---
xfse = <optimized out>
magic_cookie = <optimized out>
do_return = <optimized out>
function_nr = <optimized out>
le = <optimized out>
0000009 0x80276187 in ?? ()
No symbol table info available.
0000010 0x802814e6 in ?? ()
No symbol table info available.
0000011 0x8023473a in execute_ex ()
No symbol table info available.
0000012 0x801e805d in dtrace_execute_ex ()
No symbol table info available.
0000013 0xb75cfeb0 in xdebug_execute_ex (execute_data=0xb761aea0) at /home/vagrant/xdebug-2.4.0/xdebug.c:1890
op_array = <optimized out>
edata = <optimized out>
dummy = <optimized out>
fse = <optimized out>
xfse = <optimized out>
magic_cookie = <optimized out>
do_return = <optimized out>
function_nr = <optimized out>
le = <optimized out>
0000014 0x80276187 in ?? ()
No symbol table info available.
0000015 0x802814e6 in ?? ()
No symbol table info available.
0000016 0x8023473a in execute_ex ()
No symbol table info available.
0000017 0x801e805d in dtrace_execute_ex ()
No symbol table info available.
0000018 0xb75cfeb0 in xdebug_execute_ex (execute_data=0xb761ab20) at /home/vagrant/xdebug-2.4.0/xdebug.c:1890
op_array = <optimized out>
edata = <optimized out>
dummy = <optimized out>
fse = <optimized out>
xfse = <optimized out>
magic_cookie = <optimized out>
---Type <return> to continue, or q <return> to quit---
do_return = <optimized out>
function_nr = <optimized out>
le = <optimized out>
0000019 0x80276187 in ?? ()
No symbol table info available.
0000020 0x802814e6 in ?? ()
No symbol table info available.
0000021 0x8023473a in execute_ex ()
No symbol table info available.
0000022 0x801e805d in dtrace_execute_ex ()
No symbol table info available.
0000023 0xb75cfeb0 in xdebug_execute_ex (execute_data=0xb761aad0) at /home/vagrant/xdebug-2.4.0/xdebug.c:1890
op_array = <optimized out>
edata = <optimized out>
dummy = <optimized out>
fse = <optimized out>
xfse = <optimized out>
magic_cookie = <optimized out>
do_return = <optimized out>
function_nr = <optimized out>
le = <optimized out>
0000024 0x80276187 in ?? ()
No symbol table info available.
0000025 0x802814e6 in ?? ()
No symbol table info available.
0000026 0x8023473a in execute_ex ()
No symbol table info available.
0000027 0x801e805d in dtrace_execute_ex ()
No symbol table info available.
0000028 0xb75cfeb0 in xdebug_execute_ex (execute_data=0xb761a890) at /home/vagrant/xdebug-2.4.0/xdebug.c:1890
op_array = <optimized out>
edata = <optimized out>
dummy = <optimized out>
fse = <optimized out>
xfse = <optimized out>
magic_cookie = <optimized out>
do_return = <optimized out>
function_nr = <optimized out>
---Type <return> to continue, or q <return> to quit---
le = <optimized out>
0000029 0x801e9a82 in zend_call_function ()
No symbol table info available.
0000030 0x80135057 in zif_call_user_func_array ()
No symbol table info available.
0000031 0x80280de8 in execute_internal ()
No symbol table info available.
0000032 0x801e815f in dtrace_execute_internal ()
No symbol table info available.
0000033 0xb75d0894 in xdebug_execute_internal (current_execute_data=0xb761a840, return_value=0xb761a6e0)
at /home/vagrant/xdebug-2.4.0/xdebug.c:2035
edata = <optimized out>
fse = 0x80914950
do_return = <optimized out>
function_nr = <optimized out>
restore_error_handler_situation = <optimized out>
tmp_error_cb = <optimized out>
0000034 0x80276524 in ?? ()
No symbol table info available.
#35 0x802814e6 in ?? ()
No symbol table info available.
0000036 0x8023473a in execute_ex ()
No symbol table info available.
0000037 0x801e805d in dtrace_execute_ex ()
No symbol table info available.
0000038 0xb75cfeb0 in xdebug_execute_ex (execute_data=0xb761a470) at /home/vagrant/xdebug-2.4.0/xdebug.c:1890
op_array = <optimized out>
edata = <optimized out>
dummy = <optimized out>
fse = <optimized out>
xfse = <optimized out>
magic_cookie = <optimized out>
do_return = <optimized out>
function_nr = <optimized out>
le = <optimized out>
0000039 0x80276187 in ?? ()
No symbol table info available.
0000040 0x802814e6 in ?? ()
---Type <return> to continue, or q <return> to quit---
No symbol table info available.
0000041 0x8023473a in execute_ex ()
No symbol table info available.
0000042 0x801e805d in dtrace_execute_ex ()
No symbol table info available.
0000043 0xb75cfeb0 in xdebug_execute_ex (execute_data=0xb761a390) at /home/vagrant/xdebug-2.4.0/xdebug.c:1890
op_array = <optimized out>
edata = <optimized out>
dummy = <optimized out>
fse = <optimized out>
xfse = <optimized out>
magic_cookie = <optimized out>
do_return = <optimized out>
function_nr = <optimized out>
le = <optimized out>
0000044 0x80276187 in ?? ()
No symbol table info available.
0000045 0x802814e6 in ?? ()
No symbol table info available.
0000046 0x8023473a in execute_ex ()
No symbol table info available.
0000047 0x801e805d in dtrace_execute_ex ()
No symbol table info available.
0000048 0xb75cfeb0 in xdebug_execute_ex (execute_data=0xb761a2e0) at /home/vagrant/xdebug-2.4.0/xdebug.c:1890
op_array = <optimized out>
edata = <optimized out>
dummy = <optimized out>
fse = <optimized out>
xfse = <optimized out>
magic_cookie = <optimized out>
do_return = <optimized out>
function_nr = <optimized out>
le = <optimized out>
#49 0x80276187 in ?? ()
No symbol table info available.
0000050 0x802814e6 in ?? ()
No symbol table info available.
#51 0x8023473a in execute_ex ()
---Type <return> to continue, or q <return> to quit---
No symbol table info available.
0000052 0x801e805d in dtrace_execute_ex ()
No symbol table info available.
0000053 0xb75cfeb0 in xdebug_execute_ex (execute_data=0xb761a1f0) at /home/vagrant/xdebug-2.4.0/xdebug.c:1890
op_array = <optimized out>
edata = <optimized out>
dummy = <optimized out>
fse = <optimized out>
xfse = <optimized out>
magic_cookie = <optimized out>
do_return = <optimized out>
function_nr = <optimized out>
le = <optimized out>
0000054 0x80276187 in ?? ()
No symbol table info available.
0000055 0x802814e6 in ?? ()
No symbol table info available.
0000056 0x8023473a in execute_ex ()
No symbol table info available.
0000057 0x801e805d in dtrace_execute_ex ()
No symbol table info available.
0000058 0xb75cfeb0 in xdebug_execute_ex (execute_data=0xb7619c60) at /home/vagrant/xdebug-2.4.0/xdebug.c:1890
op_array = <optimized out>
edata = <optimized out>
dummy = <optimized out>
fse = <optimized out>
xfse = <optimized out>
magic_cookie = <optimized out>
do_return = <optimized out>
function_nr = <optimized out>
le = <optimized out>
0000059 0x80276187 in ?? ()
No symbol table info available.
0000060 0x802814e6 in ?? ()
No symbol table info available.
0000061 0x8023473a in execute_ex ()
No symbol table info available.
0000062 0x801e805d in dtrace_execute_ex ()
---Type <return> to continue, or q <return> to quit---
No symbol table info available.
0000063 0xb75cfeb0 in xdebug_execute_ex (execute_data=0xb7619b30) at /home/vagrant/xdebug-2.4.0/xdebug.c:1890
op_array = <optimized out>
edata = <optimized out>
dummy = <optimized out>
fse = <optimized out>
xfse = <optimized out>
magic_cookie = <optimized out>
do_return = <optimized out>
function_nr = <optimized out>
le = <optimized out>
0000064 0x801e9a82 in zend_call_function ()
No symbol table info available.
0000065 0x800e62f5 in zim_reflection_method_invokeArgs ()
No symbol table info available.
0000066 0x80280de8 in execute_internal ()
No symbol table info available.
0000067 0x801e815f in dtrace_execute_internal ()
No symbol table info available.
0000068 0xb75d0894 in xdebug_execute_internal (current_execute_data=0xb7619ae0, return_value=0xb76197b0)
at /home/vagrant/xdebug-2.4.0/xdebug.c:2035
edata = <optimized out>
fse = 0x80d71188
do_return = <optimized out>
function_nr = <optimized out>
restore_error_handler_situation = <optimized out>
tmp_error_cb = <optimized out>
0000069 0x80276524 in ?? ()
No symbol table info available.
0000070 0x802814e6 in ?? ()
No symbol table info available.
0000071 0x8023473a in execute_ex ()
No symbol table info available.
0000072 0x801e805d in dtrace_execute_ex ()
No symbol table info available.
0000073 0xb75cfeb0 in xdebug_execute_ex (execute_data=0xb76195e0) at /home/vagrant/xdebug-2.4.0/xdebug.c:1890
op_array = <optimized out>
edata = <optimized out>
---Type <return> to continue, or q <return> to quit---
dummy = <optimized out>
fse = <optimized out>
xfse = <optimized out>
magic_cookie = <optimized out>
do_return = <optimized out>
function_nr = <optimized out>
le = <optimized out>
0000074 0x80276187 in ?? ()
No symbol table info available.
0000075 0x802814e6 in ?? ()
No symbol table info available.
0000076 0x8023473a in execute_ex ()
No symbol table info available.
0000077 0x801e805d in dtrace_execute_ex ()
No symbol table info available.
0000078 0xb75cfeb0 in xdebug_execute_ex (execute_data=0xb7618e20) at /home/vagrant/xdebug-2.4.0/xdebug.c:1890
op_array = <optimized out>
edata = <optimized out>
dummy = <optimized out>
fse = <optimized out>
xfse = <optimized out>
magic_cookie = <optimized out>
do_return = <optimized out>
function_nr = <optimized out>
le = <optimized out>
0000079 0x80276187 in ?? ()
No symbol table info available.
0000080 0x802814e6 in ?? ()
No symbol table info available.
0000081 0x8023473a in execute_ex ()
No symbol table info available.
0000082 0x801e805d in dtrace_execute_ex ()
No symbol table info available.
0000083 0xb75cfeb0 in xdebug_execute_ex (execute_data=0xb76181c0) at /home/vagrant/xdebug-2.4.0/xdebug.c:1890
op_array = <optimized out>
edata = <optimized out>
dummy = <optimized out>
fse = <optimized out>
---Type <return> to continue, or q <return> to quit---
xfse = <optimized out>
magic_cookie = <optimized out>
do_return = <optimized out>
function_nr = <optimized out>
le = <optimized out>
0000084 0x80276187 in ?? ()
No symbol table info available.
0000085 0x802814e6 in ?? ()
No symbol table info available.
0000086 0x8023473a in execute_ex ()
No symbol table info available.
0000087 0x801e805d in dtrace_execute_ex ()
No symbol table info available.
0000088 0xb75cfeb0 in xdebug_execute_ex (execute_data=0xb7617790) at /home/vagrant/xdebug-2.4.0/xdebug.c:1890
op_array = <optimized out>
edata = <optimized out>
dummy = <optimized out>
fse = <optimized out>
xfse = <optimized out>
magic_cookie = <optimized out>
do_return = <optimized out>
function_nr = <optimized out>
le = <optimized out>
0000089 0x80276187 in ?? ()
No symbol table info available.
0000090 0x802814e6 in ?? ()
No symbol table info available.
0000091 0x8023473a in execute_ex ()
No symbol table info available.
0000092 0x801e805d in dtrace_execute_ex ()
No symbol table info available.
0000093 0xb75cfeb0 in xdebug_execute_ex (execute_data=0xb76171e0) at /home/vagrant/xdebug-2.4.0/xdebug.c:1890
op_array = <optimized out>
edata = <optimized out>
dummy = <optimized out>
fse = <optimized out>
xfse = <optimized out>
magic_cookie = <optimized out>
---Type <return> to continue, or q <return> to quit---
do_return = <optimized out>
function_nr = <optimized out>
le = <optimized out>
0000094 0x80276187 in ?? ()
No symbol table info available.
0000095 0x802814e6 in ?? ()
No symbol table info available.
0000096 0x8023473a in execute_ex ()
No symbol table info available.
0000097 0x801e805d in dtrace_execute_ex ()
No symbol table info available.
0000098 0xb75cfeb0 in xdebug_execute_ex (execute_data=0xb7616c30) at /home/vagrant/xdebug-2.4.0/xdebug.c:1890
op_array = <optimized out>
edata = <optimized out>
dummy = <optimized out>
fse = <optimized out>
xfse = <optimized out>
magic_cookie = <optimized out>
do_return = <optimized out>
function_nr = <optimized out>
le = <optimized out>
0000099 0x80276187 in ?? ()
No symbol table info available.
0000100 0x802814e6 in ?? ()
No symbol table info available.
0000101 0x8023473a in execute_ex ()
No symbol table info available.
0000102 0x801e805d in dtrace_execute_ex ()
No symbol table info available.
0000103 0xb75cfeb0 in xdebug_execute_ex (execute_data=0xb7615530) at /home/vagrant/xdebug-2.4.0/xdebug.c:1890
op_array = <optimized out>
edata = <optimized out>
dummy = <optimized out>
fse = <optimized out>
xfse = <optimized out>
magic_cookie = <optimized out>
do_return = <optimized out>
function_nr = <optimized out>
---Type <return> to continue, or q <return> to quit---
le = <optimized out>
0000104 0x80276187 in ?? ()
No symbol table info available.
0000105 0x802814e6 in ?? ()
No symbol table info available.
0000106 0x8023473a in execute_ex ()
No symbol table info available.
0000107 0x801e805d in dtrace_execute_ex ()
No symbol table info available.
0000108 0xb75cfeb0 in xdebug_execute_ex (execute_data=0xb7615150) at /home/vagrant/xdebug-2.4.0/xdebug.c:1890
op_array = <optimized out>
edata = <optimized out>
dummy = <optimized out>
fse = <optimized out>
xfse = <optimized out>
magic_cookie = <optimized out>
do_return = <optimized out>
function_nr = <optimized out>
le = <optimized out>
0000109 0x80276187 in ?? ()
No symbol table info available.
0000110 0x802814e6 in ?? ()
No symbol table info available.
0000111 0x8023473a in execute_ex ()
No symbol table info available.
0000112 0x801e805d in dtrace_execute_ex ()
No symbol table info available.
0000113 0xb75cfeb0 in xdebug_execute_ex (execute_data=0xb7615090) at /home/vagrant/xdebug-2.4.0/xdebug.c:1890
op_array = <optimized out>
edata = <optimized out>
dummy = <optimized out>
fse = <optimized out>
xfse = <optimized out>
magic_cookie = <optimized out>
do_return = <optimized out>
function_nr = <optimized out>
le = <optimized out>
0000114 0x80276187 in ?? ()
---Type <return> to continue, or q <return> to quit---
No symbol table info available.
0000115 0x802814e6 in ?? ()
No symbol table info available.
0000116 0x8023473a in execute_ex ()
No symbol table info available.
0000117 0x801e805d in dtrace_execute_ex ()
No symbol table info available.
0000118 0xb75cfeb0 in xdebug_execute_ex (execute_data=0xb7613020) at /home/vagrant/xdebug-2.4.0/xdebug.c:1890
op_array = <optimized out>
edata = <optimized out>
dummy = <optimized out>
fse = <optimized out>
xfse = <optimized out>
magic_cookie = <optimized out>
do_return = <optimized out>
function_nr = <optimized out>
le = <optimized out>
0000119 0x8028274b in zend_execute ()
No symbol table info available.
0000120 0x801f7900 in zend_execute_scripts ()
No symbol table info available.
0000121 0x80196f46 in php_execute_script ()
No symbol table info available.
0000122 0x802847c2 in ?? ()
No symbol table info available.
0000123 0x800704e7 in main ()
No symbol table info available.

I'm still waiting for the reproducible case.

Can I please have the reproducible case that I asked for as well?

Closing this as I can't reproduce it, and the reproducible case was not provided. Please reopen if you can provide the requested information.