Camillo, you own the offending change.

The following revision refers to this bug:
  https://chromium.googlesource.com/v8/v8.git/+/f5d4f8f80f8ca18f1c207c9f0dbc2f478f398fdf

commit f5d4f8f80f8ca18f1c207c9f0dbc2f478f398fdf
Author: cbruni <cbruni@chromium.org>
Date: Wed Oct 26 07:17:02 2016

[runtime] Fix Object.create(null) initialization order

A GC might cause the just created dictionary object to have an invalid backing
store, which breaks heap verification.

BUG= chromium:659088 

Review-Url: https://codereview.chromium.org/2452653002
Cr-Commit-Position: refs/heads/master@{#40574}

[modify] https://crrev.com/f5d4f8f80f8ca18f1c207c9f0dbc2f478f398fdf/src/runtime/runtime-object.cc

ClusterFuzz has detected this issue as fixed in range 40573:40574.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=5476639803965440

Fuzzer: mbarbella_js_mutation
Job Type: linux_asan_d8_ignition_dbg
Platform Id: linux

Crash Type: CHECK failure
Crash Address: 
Crash State:
  properties()->IsDictionary() == map()->is_dictionary_map() in objects-inl.h
  
Regressed: V8: r40550:40551
Fixed: V8: r40573:40574

Minimized Testcase (0.23 Kb):
Download: https://cluster-fuzz.appspot.com/download/AMIfv95VOaJNQ8ZCVDW6LYVuyJ0dmgYvkEWiT6GgAadb_qE5ZFlC06w_9SeAKNei_KSRgH1hZMTPJCMR5EorrvrYwrE6FClhEF4DitqU604sUiFgaOPBBOGaG41DoMkzXEj6m_RaDj3RWuFjWih_IdLZpwTkX_hE5Q?testcase_id=5476639803965440
try {
(function() {
})();
} catch(e) {; }
function __f_8 () {
  function __f_7() {
    __f_8();
  }
  function __f_9() {
  }
  var __v_7 = Object.create(null, { toString: { value: __f_9 }, length: { get: __f_9 } });
  __f_7();
}
__f_8();


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