This issue looks similar to bug 809899 , hence merging in to it. Feel free to undupe if it's a different issue.

Thanks!

I can't reproduce it, but it appears to be something to do with IntersectionObserver.

ClusterFuzz has detected this issue as fixed in range 545268:545269.

Detailed report: https://clusterfuzz.com/testcase?key=6307591169507328

Fuzzer: inferno_twister
Job Type: linux_ubsan_vptr_chrome
Platform Id: linux

Crash Type: Abrt
Crash Address: 0x053900000001
Crash State:
  blink::ReportFatalErrorInMainThread
  v8::Function::Call
  blink::V8ScriptRunner::CallFunction
  
Sanitizer: undefined (UBSAN)

Regressed: https://clusterfuzz.com/revisions?job=linux_ubsan_vptr_chrome&range=524052:524063
Fixed: https://clusterfuzz.com/revisions?job=linux_ubsan_vptr_chrome&range=545268:545269

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=6307591169507328

Additional requirements: Requires HTTP

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.