Predator, CL & Code Search did not provide any possible suspects.
Adding CF-NeedsTriage label for further inputs.
Thank You.

ClusterFuzz has detected this issue as fixed in range 503434:503457.

Detailed report: https://clusterfuzz.com/testcase?key=5859261266788352

Fuzzer: inferno_layout_test_unmodified
Job Type: windows_syzyasan_content_shell
Platform Id: windows

Crash Type: Null-dereference
Crash Address: 0x0000000f
Crash State:
  blink::HasVerticalAppearance
  blink::LayoutSliderContainer::UpdateLayout
  blink::LayoutBlockFlow::PositionAndLayoutOnceIfNeeded
  
Memory Tool: SYZYASAN

Regressed: https://clusterfuzz.com/revisions?job=windows_syzyasan_content_shell&range=451929:451968
Fixed: https://clusterfuzz.com/revisions?job=windows_syzyasan_content_shell&range=503434:503457

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5859261266788352

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 5859261266788352 is verified as fixed, so closing issue as verified.

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