[xdebug-general] Segmentation-fault in xdebug.so from pkgtools (PHP7?)

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Hello,

[ I would have filed this as a bug on http://bugs.xdebug.org, but the
captcha is not loading for me. ]

I am working on helping vet PHP7.0 in Ubuntu Xenial, potentially, and am
hitting the following issue with a recompiled (so as to pull in the PHP7
dependencies) pkgtools program (using
http://anonscm.debian.org/cgit/pkg-php/pkg-php-tools.git/log/?h=master-7.0):

pkgtools
Usage:
    pkgtools COMMAND

Options:
    --help: print help
    -h: print help
    --verbose: increase verbosity
    -v: increase verbosity
    --sourcedirectory: set source directory
    -D: set source directory

Commands:
  : Without arguments: print help
Segmentation fault (core dumped)

The segfault is actually in xdebug.so:

line 1150 in xdebug_stack.c:

                } else if (edata && edata->prev_execute_data && edata->prev_execute_data->opline && edata->prev_execute_data->opline->opcode == ZEND_INCLUDE_OR_EVAL) {

I am able to use gdb in a chroot and see:

(gdb) print *edata->prev_execute_data
$7 = {opline = 0x3, call = 0x4, return_value = 0x0, func = 0xfbcd80, This = {
    value = {lval = 0, dval = 0, counted = 0x0, str = 0x0, arr = 0x0,
      obj = 0x0, res = 0x0, ref = 0x0, ast = 0x0, zv = 0x0, ptr = 0x0,
      ce = 0x0, func = 0x0, ww = {w1 = 0, w2 = 0}}, u1 = {v = {type = 8 '\b',
        type_flags = 12 '\f', const_flags = 0 '\000', reserved = 2 '\002'},
      type_info = 33557512}, u2 = {var_flags = 1, next = 1, cache_slot = 1,
      lineno = 1, num_args = 1, fe_pos = 1, fe_iter_idx = 1}},
  called_scope = 0x7ffff3203018, prev_execute_data = 0x7ffff3213f20,
  symbol_table = 0x7ffff327d090, run_time_cache = 0x40000c08,
  literals = 0x1069c20}

where opline is pretty clearly invalid (comparing to other
prev_executed_data pointers in the chain).

I'm happy to provide more output from gdb, but not really sure where to
start :)

Thanks,
Nish

-- 
Nishanth Aravamudan
Ubuntu Server
Canonical Ltd