Testcase 6232463734210560 is a top crash on ClusterFuzz for mac platform. Please prioritize fixing this crash.

Marking this crash as a Beta release blocker.

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

Automatically applying components based on crash stacktrace and information from OWNERS files.

If this is incorrect, please apply the Test-Predator-Wrong-Components label.

hubbe: Can you please take a look, or pass this to someone more appropriate? Thanks!

Revert for this should be in CQ.

ClusterFuzz has detected this issue as fixed in range 521438:521463.

Detailed report: https://clusterfuzz.com/testcase?key=6232463734210560

Fuzzer: attekett_webaudio_fuzzer
Job Type: linux_ubsan_vptr_chrome
Platform Id: linux

Crash Type: Bad-cast
Crash Address: 0x3a061eefbf38
Crash State:
  Bad-cast to blink::Resourceblink::DocumentThreadableLoader::SetDefersLoading
  media::MultiBuffer::AddReader
  media::MultiBufferReader::UpdateInternalState
  
Sanitizer: undefined (UBSAN)

Recommended Security Severity: High

Regressed: https://clusterfuzz.com/revisions?job=linux_ubsan_vptr_chrome&range=521228:521230
Fixed: https://clusterfuzz.com/revisions?job=linux_ubsan_vptr_chrome&range=521438:521463

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=6232463734210560

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 6232463734210560 is verified as fixed, so closing issue as verified.

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

when doing a revert please manually add on the CL description any other bugs the revert affects (e.g. this one) - makes it easier for us to track down what happened here. Thanks!

I'm afraid this was also found by an internal fuzzer.

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