As discussed, moving to machenbach@ for further triage.

ClusterFuzz has detected this issue as fixed in range 42756:42757.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=6537344695140352

Fuzzer: foozzie_js_mutation
Job Type: foozzie_ignition_staging
Platform Id: linux

Crash Type: V8 correctness failure
Crash Address: 
Crash State:
  suppression: crbug.com/681806
  
Sanitizer: address (ASAN)

Regressed: V8: 42409:42410
Fixed: V8: 42756:42757

Minimized Testcase (0.57 Kb):
Download: https://cluster-fuzz.appspot.com/download/AMIfv95hnbYNUdr9Pjq5HS-c5_xHkmq_jEnaOT2DOXRilVQWVoFU--wNdrq-QFhxGWx42Ml80IYiOpGa11l9Xy3rQ0RUDrb7X9vC443Pc0OfbFWprYPq9A04I-FjDYFiOWxzeVqGxa0RRTCua8LdmFih70zOvCu9I5sgO59YNSdEikGphiM6yJdTEH6kLsZv9vBlUqRvabd3VvEbvGNIri8KZ9ZkETQdXw0lOFyYbR9Qc7LNd3wgQbbUVeKw7qOzjyN7lm03MtFxSOQGxNsGCm3U36ft-v9livuNEkB0bIJSGUuRuiI_gvV0WfBu-9kqP96FvhloFawTcI1dOQ6NRo8Ygd9OkP3kYILusHcIuWZG-iGvjGgdzXk?testcase_id=6537344695140352
__max_depth = 3
__PrettyPrint = function __PrettyPrint(value, depth=__max_depth) {
  switch (typeof value) {
    case "string":
      return String(value);
    case "object":
        return "{" + Object.keys(value).map(function(key) {
          return __PrettyPrint(key);
        })  + "}";
  }
}
var __v_51 = {};
        ( {
        });
try {
    __v_58 = {
    };
} catch(e) {; }
function __f_27() {
    "use asm";
    return {
    };
}
        (function() {
            __v_51.__defineGetter__(__f_27(), function() {
            });
        })();
print(__PrettyPrint(__v_51));


See https://dev.chromium.org/Home/chromium-security/bugs/reproducing-clusterfuzz-bugs for more information.

If you suspect that the result above is incorrect, try re-doing that job on the test case report page.