mslekova: Your CL https://chromium.googlesource.com/v8/v8/+/a9f517e2348e4dbeb74a4f2ceab98e5d254f1caa is the only one in the blame range for this bug. Can you please take a look, thanks!

This is a serious security regression. If you are not able to fix this quickly, please revert the change that introduced it.

If this doesn't affect a release branch, or has not been properly classified for severity, please update the Security_Impact or Security_Severity labels, and remove the ReleaseBlock label. To disable this altogether, apply ReleaseBlock-NA.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Fix already under review: https://chromium-review.googlesource.com/c/v8/v8/+/647550

The following revision refers to this bug:
  https://chromium.googlesource.com/v8/v8.git/+/affdc80880173a8078c9e810e0ce7fbd63641e4e

commit affdc80880173a8078c9e810e0ce7fbd63641e4e
Author: Maya Lekova <mslekova@google.com>
Date: Tue Sep 05 10:58:18 2017

Remove unnecessary check in StoreProxy

Bug: v8:6560,  chromium:761639 
Change-Id: Idf546f53b20387670e42187692e702ba5e9eab73
Reviewed-on: https://chromium-review.googlesource.com/647550
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Maya Lekova <mslekova@google.com>
Cr-Commit-Position: refs/heads/master@{#47820}
[modify] https://crrev.com/affdc80880173a8078c9e810e0ce7fbd63641e4e/src/ic/ic.cc
[add] https://crrev.com/affdc80880173a8078c9e810e0ce7fbd63641e4e/test/mjsunit/regress/regress-761639.js

ClusterFuzz has detected this issue as fixed in range 47819:47820.

Detailed report: https://clusterfuzz.com/testcase?key=5137194284220416

Fuzzer: mbarbella_js_mutation
Job Type: linux_asan_d8_dbg
Platform Id: linux

Crash Type: DCHECK failure
Crash Address: 
Crash State:
  !receiver_map->IsJSGlobalObjectMap() in ic.cc
  v8::internal::StoreIC::StoreProxy
  v8::internal::StoreIC::GetMapIndependentHandler
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=linux_asan_d8_dbg&range=47759:47760
Fixed: https://clusterfuzz.com/revisions?job=linux_asan_d8_dbg&range=47819:47820

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5137194284220416

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 5137194284220416 is verified as fixed, so closing issue as verified.

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

This bug has been closed for more than 14 weeks. Removing security view restrictions.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot