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tkent@, could this be a regression from https://chromium.googlesource.com/chromium/src/+/e3a1844f00baa577b1235998b23c50ad40dc7af5, dont see anything else in regression range that might be an issue.

@inferno: I tried to triage this but don't have access to the clusterfuzz report, how can I get access to it?

try now

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

I can consistently repro the UaF, this seems to be caused by 6ed531bd5ae325f1964ab2db962c4bf75625c95f. I started a revert: https://chromium-review.googlesource.com/c/chromium/src/+/912092

Funny i also started the revert, just before you.

ClusterFuzz has detected this issue as fixed in range 535922:535929.

Detailed report: https://clusterfuzz.com/testcase?key=5920634732019712

Fuzzer: j00ru_htmlcss_fuzz
Job Type: linux_ubsan_vptr_chrome
Platform Id: linux

Crash Type: Bad-cast
Crash Address: 0x22698369d928
Crash State:
  Bad-cast to blink::ActiveScriptWrappableBaseblink::ActiveScriptWrappableBase::TraceActiveScriptWrappables
  blink::ScriptWrappableMarkingVisitor::EnterFinalPause
  v8::internal::MarkCompactCollector::MarkLiveObjects
  
Sanitizer: undefined (UBSAN)

Recommended Security Severity: High

Regressed: https://clusterfuzz.com/revisions?job=linux_ubsan_vptr_chrome&range=535301:535306
Fixed: https://clusterfuzz.com/revisions?job=linux_ubsan_vptr_chrome&range=535922:535929

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5920634732019712

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.

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