Automatically assigning owner based on suspected regression changelist https://chromium.googlesource.com/v8/v8/+/4ef4deae6eb3277b0ce63908661bac9f64eea386 ([runtime] Change the default values of Proxy.prototype to undefined from null).

If this is incorrect, please let us know why and apply the Test-Predator-Wrong-CLs label. If you aren't the correct owner for this issue, please unassign yourself as soon as possible so it can be re-triaged.

The following revision refers to this bug:
  https://chromium.googlesource.com/v8/v8.git/+/92220026b2c4e490a78ca709e9cb9e336ef62e3a

commit 92220026b2c4e490a78ca709e9cb9e336ef62e3a
Author: Creddy <chandanreddy@google.com>
Date: Thu Aug 02 09:15:43 2018

[runtime] Setup Constructor for proxy_map

Bug:  chromium:868473 
Change-Id: I6a2f9be15cdc05cfa793650436c7ec3dd583bef4
Reviewed-on: https://chromium-review.googlesource.com/1158833
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Chandan Reddy <chandanreddy@google.com>
Cr-Commit-Position: refs/heads/master@{#54857}
[modify] https://crrev.com/92220026b2c4e490a78ca709e9cb9e336ef62e3a/src/bootstrapper.cc
[modify] https://crrev.com/92220026b2c4e490a78ca709e9cb9e336ef62e3a/src/objects-debug.cc
[modify] https://crrev.com/92220026b2c4e490a78ca709e9cb9e336ef62e3a/test/mjsunit/regress/regress-5085.js

ClusterFuzz has detected this issue as fixed in range 54856:54857.

Detailed report: https://clusterfuzz.com/testcase?key=5268979699154944

Fuzzer: ochang_js_fuzzer
Job Type: linux_ubsan_vptr_d8
Platform Id: linux

Crash Type: Ill
Crash Address: 0x55b06f46e3ce
Crash State:
  v8::internal::JSReceiver::GetCreationContext
  v8::Shell::RealmOwner
  v8::internal::FunctionCallbackArguments::Call
  
Sanitizer: undefined (UBSAN)

Regressed: https://clusterfuzz.com/revisions?job=linux_ubsan_vptr_d8&range=54744:54745
Fixed: https://clusterfuzz.com/revisions?job=linux_ubsan_vptr_d8&range=54856:54857

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5268979699154944

See https://github.com/google/clusterfuzz-tools for more information.

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

ClusterFuzz testcase 5268979699154944 is verified as fixed, so closing issue as verified.

If this is incorrect, please add ClusterFuzz-Wrong label and re-open the issue.