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.

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Michael, I've noticed that you've been working on | bool ScriptWrappableVisitor::AdvanceTracing() |. Would you mind taking a look and/or helping to find an owner?

There haven't been any changes in this method for months. I would guess it's some other change the introduces a memory corruption.

Keishi, any thoughts?

I would assume it is module loader related as 	73bb506d40e7618c72d23bb949fc37928ea68f21 is in the range.

Forgot to mention: The minimal repro is also loading a module.

ClusterFuzz has detected this issue as fixed in range 483281:483366.

Detailed report: https://clusterfuzz.com/testcase?key=4664127531515904

Fuzzer: inferno_twister
Job Type: mac_asan_content_shell
Platform Id: mac

Crash Type: Use-after-poison READ 8
Crash Address: 0x7eba05024d38
Crash State:
  blink::ScriptWrappableVisitor::DispatchTraceWrappers
  blink::ScriptWrappableVisitor::AdvanceTracing
  v8::internal::MarkCompactCollector::ProcessEphemeralMarking
  
Sanitizer: address (ASAN)

Recommended Security Severity: High

Regressed: https://clusterfuzz.com/revisions?job=mac_asan_content_shell&range=482161:482264
Fixed: https://clusterfuzz.com/revisions?job=mac_asan_content_shell&range=483281:483366

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=4664127531515904


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.

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