Predator and CL could not provide any possible suspects.
Using Code Search for the file, "LifecycleNotifier.h" assigning to the concern owner from GIT Blame.

Suspecting Commit#
https://chromium.googlesource.com/chromium/src/+/d6f04a76bd3b49d538eadf08e97e64b800531ba0

@pilgrim -- Could you please look into the issue, kindly re-assign if this is not related to your changes.
Thank You.

ClusterFuzz has detected this issue as fixed in range 490847:492300.

Detailed report: https://clusterfuzz.com/testcase?key=5085246356979712

Fuzzer: inferno_layout_test_unmodified
Job Type: linux_ubsan_vptr_content_shell_drt
Platform Id: linux

Crash Type: CHECK failure
Crash Address: 
Crash State:
  iteration_state_ & kAllowingAddition in LifecycleNotifier.h
  blink::LifecycleObserver<>::SetContext
  blink::WindowAudioWorklet::WindowAudioWorklet
  
Sanitizer: undefined (UBSAN)

Regressed: https://clusterfuzz.com/revisions?job=linux_ubsan_vptr_content_shell_drt&range=490547:490630
Fixed: https://clusterfuzz.com/revisions?job=linux_ubsan_vptr_content_shell_drt&range=490847:492300

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5085246356979712


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 5085246356979712 is verified as fixed, so closing issue as verified.

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